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buildtools/autoconf/NEWS
Ingo Weinhold 939977cf72 Merged autoconf 2.61 into trunk. 
git-svn-id: file:///srv/svn/repos/haiku/buildtools/trunk@24464 a95241bf-73f2-0310-859d-f6bbb57e9c96
2008-03-19 12:42:05 +00:00

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* Major changes in Autoconf 2.61 (2006-11-17)
** New macros AC_C_FLEXIBLE_ARRAY_MEMBER, AC_C_VARARRAYS.
** AC_ARG_ENABLE and AC_ARG_WITH now allow '.' in feature and package names.
* Major changes in Autoconf 2.60b (2006-10-22)
** BIN_SH
Autoconf-generated shell scripts no longer export BIN_SH, due to
configuration hassles with this. Installers who need BIN_SH in
their environment should set it before invoking 'configure' and
'make'. As far as we know, this affects only Unixware installations.
** Obsolescent macros
The documentation now says that the following macros are obsolescent,
as they are superseded by Gnulib:
AC_FUNC_FNMATCH AC_FUNC_FNMATCH_GNU AC_FUNC_GETLOADVG AC_REPLACE_FNMATCH
New programs should use the Gnulib counterparts of these macros.
We have no current plans to remove them from Autoconf.
** AC_COMPUTE_INT no longer caches or reports results.
** AC_CHECK_DECL now also works with aggregate objects.
** AC_USE_SYSTEM_EXTENSIONS now defines _TANDEM_SOURCE for NonStop platforms.
** GNU M4 1.4.7 or later is now recommended.
** m4_mkstemp
New M4sugar macro, which is more secure than the POSIX M4 maketemp.
** m4_maketemp
Now an alias for m4_mkstemp.
* Major changes in Autoconf 2.60a (2006-08-25)
** GNU M4 1.4.6 or later is now recommended.
** The check for C99 now tests for varargs macros, as documented.
It also tests that the preprocessor supports 64-bit integers.
** Autoconf now uses constructs like "#ifdef HAVE_STDLIB_H" rather than
"#if HAVE_STDLIB_H", so that it now works with "gcc -Wundef -Werror".
** The functionality of the undocumented _AC_COMPUTE_INT is now provided
by a public and documented macro, AC_COMPUTE_INT. The parameters to the
two macros are different, so autoupdate will not change the old private name
to the new one. _AC_COMPUTE_INT may be removed in a future release.
** AC_TYPE_LONG_LONG_INT and AC_TYPE_UNSIGNED_LONG_LONG_INT now require
that long long types be at least 64 bits wide, as C99 and tradition
requires. Formerly, they accepted implementations of any width.
* Major changes in Autoconf 2.60
Released 2006-06-23, by Ralf Wildenhues.
** Autoconf no longer depends on whether m4wrap is FIFO (as Posix requires)
or LIFO (as in GNU M4 1.4.x). GNU M4 2.0 is expected to conform to Posix
here, so m4wrap/m4_wrap users should no longer depend on LIFO behavior.
** Provide a way to turn off warnings about the changed directory variables.
* Major changes in Autoconf 2.59d
Released 2006-06-05, by Ralf Wildenhues.
** GNU make now recommended for VPATH builds
INSTALL now suggests VPATH builds (e.g., "sh ../srcdir/configure")
only if you use GNU make. In practice, other 'make' implementations
have too many subtle incompatibilities in their support for VPATH.
Many packages (including Autoconf itself) are portable to other
'make' implementations, but some packages are not, and recommending
GNU make keeps the installation instructions simpler.
** Even more safety checks for the new Directory variables:
Warn about suspicious `${datarootdir}' found in config files output.
** AC_TRY_COMMAND, AC_TRY_EVAL, ac_config_guess, ac_config_sub, ac_configure
These never-documented macros and variables have been marked with
comments saying that they may be removed in a future release,
because their use can lead to unintended code being executed.
If you need functionality that only these macros or variables
currently supply, please write bug-autoconf@gnu.org.
** AC_SUBST, AC_DEFINE
Literal arguments to these are passed to m4_pattern_allow now.
** AC_PROG_CC_STDC
Passing 'ac_cv_prog_cc_stdc=no' to 'configure' now sets ac_cv_prog_cc_c99
and ac_cv_prog_cc_c89 to 'no' as well, for backward compatibility with
obsolete K&R tests in the Automake test suite.
** AC_PROG_CXX_C_O
New macro.
** AC_PROG_MKDIR_P
New macro.
** AS_MKDIR_P
Now more robust with special characters in file names, or when
multiple processes create the same directory at the same time.
** Obsolescent macros
The documentation now says that the following macros are obsolescent:
they test for problems that are so old that they are no longer of
practical importance on current systems.
AC_C_BACKSLASH_A AC_FUNC_MEMCMP AC_HEADER_DIRENT
AC_C_CONST AC_FUNC_SELECT_ARGTYPES AC_HEADER_STAT
AC_C_PROTOTYPES AC_FUNC_SETPGRP AC_HEADER_STDC
AC_C_STRINGIZE AC_FUNC_SETVBUF_REVERSED AC_HEADER_SYS_WAIT
AC_C_VOLATILE AC_FUNC_STAT AC_HEADER_TIME
AC_FUNC_CLOSEDIR_VOID AC_FUNC_STRFTIME AC_ISC_POSIX
AC_FUNC_GETPGRP AC_FUNC_UTIME_NULL AC_PROG_GCC_TRADITIONAL
AC_FUNC_LSTAT AC_FUNC_VPRINTF AC_STRUCT_TM
New programs need not use these macros. We have no current plans to
remove them.
** autoreconf
For compatibility with future Libtool 2.0, autoreconf will invoke
libtoolize with the option `--ltdl' now, if LT_CONFIG_LTDL_DIR is
used.
* Major changes in Autoconf 2.59c
Released 2006-04-12, by Ralf Wildenhues.
** The configure command now redirects standard input from /dev/null,
to help avoid problems with subsidiary commands that might mistakenly
read standard input. AS_ORIGINAL_STDIN_FD points to the original
standard input before this redirection, if you really want configure to
read from standard input.
** Directory variables adjusted to recent changes in the GNU Coding Standards.
The following directory variables are new:
datarootdir read-only architecture-independent data root [PREFIX/share]
localedir locale-specific message catalogs [DATAROOTDIR/locale]
docdir documentation root [DATAROOTDIR/doc/PACKAGE]
htmldir html documentation [DOCDIR]
dvidir dvi documentation [DOCDIR]
pdfdir pdf documentation [DOCDIR]
psdir ps documentation [DOCDIR]
The following variables have new default values:
datadir read-only architecture-independent data [DATAROOTDIR]
infodir info documentation [DATAROOTDIR/info]
mandir man documentation [DATAROOTDIR/man]
This means that if you use any of `@datadir@', `@infodir@', or
`@mandir@' in a file, you will have to ensure `${datarootdir}' is
defined in this file. As a temporary measure, if any of those are
found but no mention of `datarootdir', the substitutions will be
replaced with values that do not contain `${datarootdir}', and a
warning will be issued.
** @top_builddir@ is now a dir name: it is always nonempty and doesn't have
a trailing slash. Similar change will be made to ac_top_builddir in a
future release; the old style value, which matches (../)*, is (and will
continue to be) available as ac_top_build_prefix.
** AC_C_TYPEOF
New macro to check for support of 'typeof' syntax a la GNU C.
** AC_CHECK_DECLS_ONCE, AC_CHECK_FUNCS_ONCE, AC_CHECK_HEADERS_ONCE
New "once-only" variants of commonly-used macros, to make 'configure'
smaller and faster in common cases.
** AC_FUNC_STRTOLD
New macro to check for strtold with C99 semantics.
** AC_HEADER_ASSERT
New macro that lets builder disable assertions at 'configure'-time.
** AC_PATH_X
Now checks for X11/Xlib.h and XrmInitialize (X proper) rather than
X11/Intrinsic.h and XtMalloc (Xt).
** AC_PRESERVE_HELP_ORDER
New macro that causes `configure' to display help strings for AC_ARG_ENABLE
and AC_ARG_WITH arguments in one region, in the order defined. The default
behavior is to group options of each classes separately.
** AC_PROG_CC, AC_PROG_CXX
No longer automatically arrange to declare the 'exit' function of C,
when a C++ compiler is used. Standard Autoconf macros no longer use
'exit', so this is no longer an issue for them. If you use C++, and
want to call 'exit', you'll have to arrange for its declaration
yourself. But we now suggest you return from 'main' instead.
** AC_PROG_CC_C89, AC_PROG_CC_C99
New macros for ISO C99 support. AC_PROG_CC_C89 and AC_PROG_CC_C99
check for ANSI C89 and ISO C99 support respectively.
** AC_PROG_CC_STDC
Has been unobsoleted, and will check if the compiler supports ISO
C99, falling back to ANSI C89 if not. ac_cv_prog_cc_stdc is
retained for backwards compatibility, assuming the value of
ac_cv_prog_cc_c99 or ac_cv_prog_cc_c89 (whichever is valid, in
that order).
** AC_STRUCT_DIRENT_D_INO, AC_STRUCT_DIRENT_D_TYPE
New macros for checking commonly-used members of struct dirent.
** AC_SUBST
The substituted value can now contain newlines.
** AC_SUBST_FILE
The substitution now occurs only when @variable@ is on a line by itself,
optionally surrounded by spaces and tabs. The whole line is replaced.
** AC_TYPE_LONG_DOUBLE, AC_TYPE_LONG_DOUBLE_WIDER
New macros to check for long double, and whether it is wider than double.
The old macro AC_C_TYPE_LONG_DOUBLE has been marked as obsolete;
applications should switch to the new macro.
** AC_TYPE_INT8_T, AC_TYPE_INT16_T, AC_TYPE_INT32_T, AC_TYPE_INT64_T,
AC_TYPE_INTMAX_T, AC_TYPE_INTPTR_T, AC_TYPE_LONG_LONG_INT, AC_TYPE_SSIZE_T,
AC_TYPE_UINT8_T, AC_TYPE_UINT16_T, AC_TYPE_UINT32_T, AC_TYPE_UINT64_T,
AC_TYPE_UINTMAX_T, AC_TYPE_UINTPTR_T, AC_TYPE_UNSIGNED_LONG_LONG_INT
New macros to check for C99 and POSIX types.
** AC_USE_SYSTEM_EXTENSIONS
New macro to enable extensions to Posix.
** AH_HEADER
New macro which is defined to the name of the first declared config header
or undefined if no config headers have been declared yet.
** AS_HELP_STRING
The macro correctly handles quadrigraphs now.
** AS_BOURNE_COMPATIBLE, AS_SHELL_SANITIZE, AS_CASE
These macros are new or published now.
** AT_COPYRIGHT
New macro for copyright notices in testsuite files.
** ALLOCA, LIBOBJS, LTLIBOBJS
Object names added to these variables are now prefixed with `${LIBOBJDIR}',
as in `${LIBOBJDIR}alloca.o'. LIBOBJDIR is meant to be defined from
`Makefile.in' in case the object files lie in a different directory.
The LIBOBJDIR feature is experimental.
** autoreconf
Supports --no-recursive now.
** New macros to support Erlang/OTP.
New macros for configuring paths to Erlang tools and libraries:
AC_ERLANG_PATH_ERLC, AC_ERLANG_NEED_ERLC, AC_ERLANG_PATH_ERL,
AC_ERLANG_NEED_ERL, AC_ERLANG_CHECK_LIB, AC_ERLANG_SUBST_ROOT_DIR,
AC_ERLANG_SUBST_LIB_DIR.
New macros for configuring installation of Erlang libraries:
AC_ERLANG_SUBST_INSTALL_LIB_DIR, AC_ERLANG_SUBST_INSTALL_LIB_SUBDIR.
** The manual now mentions Gnulib more prominently.
** New macros to support Objective C.
AC_PROG_OBJC, AC_PROG_OBJCPP.
* Major changes in Autoconf 2.59b
Released 2004-08-20, by Paul Eggert.
** AC_CHECK_ALIGNOF
New macro that computes the default alignment of a type.
** AC_CHECK_TOOL, AC_PATH_TOOL, AC_CHECK_TOOLS
When cross-compiling, these macros will give a warning if the tool
is not prefixed. In the future, unprefixed cross tools will not
be detected; please consult the info documentation for information
about the reason of this change.
** AC_CHECK_TARGET_TOOL, AC_PATH_TARGET_TOOL, AC_CHECK_TARGET_TOOLS
New macros that detect programs whose name is prefixed with the
target type, if the build type and target type are different.
** AC_REQUIRE_AUX_FILE
New trace macro that declares expected auxiliary files.
** AC_PROG_GREP
New macro that tests for a grep program that accepts as a long a line
as possible.
** AC_PROG_EGREP, AC_PROG_FGREP
These macros now require AC_PROG_GREP, and try EGREP="$GREP -E" and
FGREP="$GREP -F" respectively if possible, or else run a path search for
a program that accepts as long a line as possible.
** AC_PROG_SED
New macro that tests for a sed program that truncates as few characters
as possible.
* Major changes in Autoconf 2.59
Released 2003-11-04, by Akim Demaille
** ac_abs_builddir etc.
Absolute file names were actually relative in 2.58.
* Major changes in Autoconf 2.58
Released 2003-11-04, by Akim Demaille
** core.*
core.* files are no longer removed, as they may be valid user files.
** autoreconf and auxiliary directory
Autoreconf creates the auxiliary directory if needed. This is
especially useful for initial "bootstrapping" of fresh CVS checkouts.
** AC_CONFIG_MACRO_DIR
Use this macro to declare the directory for local M4 macros for aclocal.
** AC_LIBOBJS
No longer includes twice the same file in LIBOBJS if invoked
multiple times.
** AC_CONFIG_COMMANDS
The directory for its first argument is automatically created. For
instance, with
AC_CONFIG_COMMANDS([src/modules.hh], [...])
$top_builddir/src/ is created if needed.
** Autotest and local.at
The optional file local.at is always included in Autotest test suites.
** Warnings
The warnings are always issued, including with cached runs.
This became a significant problem since aclocal and automake can
run autoconf behind the scene.
** autoheader warnings
The warnings of autoheader can be turned off, using --warning.
For instance, -Wno-obsolete disables the complaints about acconfig.h
and other deprecated constructs.
** New macros
AC_C_RESTRICT, AC_INCLUDES_DEFAULT, AC_LANG_ASSERT, AC_LANG_WERROR,
AS_SET_CATFILE.
** AC_DECL_SYS_SIGLIST
Works again.
** AC_FUNC_MKTIME
Now checks that mktime is the inverse of localtime.
** Improve DJGPP portability
The Autoconf tools and configure behave better under DJGPP.
** Present But Cannot Be Compiled
New FAQ section dedicated to the mystic
configure: WARNING: pi.h: present but cannot be compiled
configure: WARNING: pi.h: check for missing prerequisite headers?
configure: WARNING: pi.h: proceeding with the preprocessor's result
messages.
** Concurrent executions of autom4te
autom4te now locks its internal files, which enables concurrent
executions of autom4te, likely to happen if automake, autoconf,
autoheader etc. are run simultaneously.
** Libtool
Use of Libtool 1.5 and higher is encouraged. Compatibility with
Libtool pre-1.4 is not checked.
** Autotest
Testsuites no longer rerun failed tests in verbose mode; instead,
failures are logged while the test is run.
In addition, expected failures can be marked as such.
* Major changes in Autoconf 2.57
Released 2002-12-03 by Paul Eggert.
Bug fixes for problems with AIX linker, with freestanding C compilers,
with GNU M4 limitations, and with obsolete copies of GNU documents.
The Free Documentation License has been upgraded from 1.1 to 1.2.
* Major changes in Autoconf 2.56
Released 2002-11-15 by Akim Demaille.
One packaging problem fixed (config/install-sh was not executable).
* Major changes in Autoconf 2.55
Released 2002-11-14 by Akim Demaille.
Release tips:
Have your configure.ac checked by autoscan ("autoscan").
Try the warning options ("autoreconf -fv -Wall").
** Documentation
- AC_CHECK_HEADER, AC_CHECK_HEADERS
More information on proper use.
- Writing Test Programs
This sections explains how to write good test sources to use with
AC_COMPILE_IFELSE etc. It documents AC_LANG_PROGRAM and so forth.
- AC_FOO_IFELSE vs. AC_TRY_FOO
Explains why Autoconf moves from AC_TRY_COMPILE etc. to
AC_COMPILE_IFELSE and AC_LANG_PROGRAM etc.
** autoreconf
- Is more robust to different Gettext installations.
- Produces messages (when --verbose) to be understood by Emacs'
compile mode.
- Supports -W/--warnings.
- -m/--make
Once the GNU Build System reinstalled, run `./config.status
--recheck && ./config.status && make' if possible.
** autom4te
- Supports --cache, and --no-cache.
- ~/.autom4te.cfg makes it possible to disable the caching mechanism
(autom4te.cache). See `Customizing autom4te' in the documentation.
** config.status
Supports --quiet.
** Obsolete options
Support for the obsoleted options -m, --macrodir, -l, --localdir is
dropped in favor of the safer --include/--prepend-include scheme.
** Macros
- New macros
AC_COMPILER_IFELSE, AC_FUNC_MBRTOWC, AC_HEADER_STDBOOL,
AC_LANG_CONFTEST, AC_LANG_SOURCE, AC_LANG_PROGRAM, AC_LANG_CALL,
AC_LANG_FUNC_TRY_LINK, AC_MSG_FAILURE, AC_PREPROC_IFELSE.
- Obsoleted
Obsoleted macros are kept for Autoconf backward compatibility, but
should be avoided in configure.ac. Running autoupdate is advised.
AC_DECL_SYS_SIGLIST.
- AC_DEFINE/AC_DEFINE_UNQUOTED
We have to stop using the old compatibility scheme --that tried to
avoid useless backslashes-- because Libtool 1.4.3 contains a
AC_DEFINE([error_t], [int],
[Define to a type to use for \`error_t' if it is not
otherwise available.])
We have to quote the single quotes and backslashes with \. The old
compatibility scheme saw that ` was backslashed, and therefore did
not quote the single quote... Failure. Hence, Autoconf 2.54 is not
compatible with Libtool. Autoconf 2.55 is, but in some cases might
produce more \ than wanted.
Please, note that in the future the same problem will happen with
AC_MSG_*: use `autoreconf -f -Wall'.
** Bug Fixes
- Portability of the Autoconf package to Solaris.
- Spurious warnings caused by config.status.
This bug is benign, but painful: on some systems (typically
FreeBSD), warnings such as:
config.status: creating Makefile
mv: Makefile: set owner/group (was: 1357/0): Operation not permitted
could be issued. This is fixed.
- Parallel Builds
Simultaneous executions of config.status are possible again.
- Precious variables accumulation
config.status could stack several copies of the precious variables
assignments.
** Plans for later versions
- ./configure <host>
The compatibility hooks with the old scheme will be completely
removed. Please, advice/use `--build', `--host', and `--target'
only.
- AC_CHECK_HEADER, AC_CHECK_HEADERS
The tests will be stricter, please make sure your invocations are
valid.
- shell functions
Shell functions will gradually be introduced, probably starting with
Autotest. If you know machines which are in use that you suspect
*not* to support shell functions, please run the test suite of
Autoconf 2.55 on it, and report the results to
bug-autoconf@gnu.org.
- AC_MSG_*
Special characters in AC_MSG_* need not be quoted. Currently,
Autoconf has heuristics to decide when a string is escaped, or has
to be escaped. This scheme is fragile, and will be removed; the
only risk is uglified messages. Please, run `autoreconf -f -Wall'
to find occurrences that will be affected.
* Major changes in Autoconf 2.54
Released 2002-09-13 by Akim Demaille.
** Executables
- autoreconf no longer changes the version of the gettext/po/intl
support files. It now adds the files the correspond to the
AM_GNU_GETTEXT_VERSION declared in configure.ac.
Warning: It now relies on the 'autopoint' program, which is part
of GNU gettext 0.11.4 and newer.
Please note that you need to have a GNU gettext version that
corresponds at least to the AM_GNU_GETTEXT_VERSION declared
in configure.ac. You can upgrade to newer GNU gettext versions,
though, without needing to change configure.ac.
- The -I DIR or --include=DIR option now appends DIR to the include path
instead of prepending; this is for consistency with other GNU tools.
The new -B DIR or --prepend-include=DIR option has the old behavior.
** Macros
- AC_OUTPUT
Now handles all the gory details about LIBOBJS and LTLIBOBJS.
Please, remove lines such as
# This is necessary so that .o files in LIBOBJS are also
# built via the ANSI2KNR-filtering rules.
LIBOBJS=`echo $LIBOBJS|sed 's/\.o /\$U.o /g;s/\.o$/\$U.o/'`
and read the `AC_LIBOBJ vs LIBOBJS' section. Do not define U in
your Makefiles either.
- AC_CONFIG_LINKS now makes copies if it can't make links.
- AC_FUNC_FNMATCH now tests only for POSIX compatibility, reverting to
Autoconf 2.13 behavior. The new macro AC_FUNC_FNMATCH_GNU also
tests for GNU extensions to fnmatch, and replaces fnmatch if needed.
- AC_FUNC_SETVBUF_REVERSED no longer fails when cross-compiling.
- AC_PROG_CC_STDC is integrated into AC_PROG_CC.
- AC_PROG_F77 default search no longer includes cf77 and cfg77.
- New macros
AC_C_BACKSLASH_A, AC_CONFIG_LIBOBJ_DIR, AC_GNU_SOURCE,
AC_PROG_EGREP, AC_PROG_FGREP, AC_REPLACE_FNMATCH,
AC_FUNC_FNMATCH_GNU, AC_FUNC_REALLOC, AC_TYPE_MBSTATE_T.
- AC_FUNC_GETLOADAVG
looks for getloadavg.c in the CONFIG_LIBOBJ_DIR.
- AC_FUNC_MALLOC
Now defines HAVE_MALLOC to 0 if `malloc' does not work, and asks
for an AC_LIBOBJ replacement.
** Bug fixes
- Spurious complaints from `m4_bmatch' about invalid regular
expressions are suppressed.
- Empty top_builddirs are properly handled.
- AC_CHECK_MEMBER works correctly when the member is an aggregate.
- AC_PATH_PROG
Now colon in the optional path arguments are properly handled.
** Improved portability
- Both Autoconf the package, and the scripts it produces, should run
more reliably with Zsh. Bear in mind it is the default Bourne shell
on Darwin.
- Autoconf and the scripts it produces no longer assume the existence of
the obsolescent commands egrep and fgrep.
** Documentation
- Limitations of Make
More of them.
- GNATS
The GNATS base moved to
http://bugs.gnu.org/cgi-bin/gnatsweb.pl?database=autoconf
(It is no longer available, though.)
** Misc.
- config.log
Now contains the list of ouput variables and files (AC_SUBST,
AC_SUBST_FILES).
* Major changes in Autoconf 2.53
Released 2002-03-08 by Akim Demaille.
** Requirements
Perl 5.005_03 or later is required: autom4te is written in Perl and is
needed by autoconf. autoheader, autoreconf, ifnames, and autoscan are
rewritten in Perl.
** Documentation
- AC_INIT
Argument requirements, output variables, defined macros.
- M4sugar, M4sh, Autotest
First sketch.
- Double quoting macros
AC_TRY_CPP, AC_TRY_COMPILE, AC_TRY_LINK and AC_TRY_RUN.
- Licensing
The Autoconf manual is now distributed under the terms of the GNU FDL.
- Section `Hosts and Cross-Compilation'
Explains the rationale for the 2.5x changes in the cross-compilation
chain, and in the relationships between build, host, and target
types.
Emphasizes that `cross-compilation' == `--host is given'.
If you are working on compilers etc., be sure to read this section.
- Section `AC_LIBOBJ vs. LIBOBJS'
Explains why assigning LIBOBJS directly is now an error.
Details how to update the code.
** configure
- $LINENO
Now used instead of hard coded line numbers.
This eases the comparison of `configure's, and diminishes the
pressure over control version archives.
Automatic replacement for shells that don't support this feature.
- New output variables
@builddir@, @top_builddir@, @abs_srcdir@, @abs_top_srcdir@, @abs_builddir@,
@abs_top_builddir@.
** Emacs
Autoconf and Autotest modes are provided.
** Executables
- autom4te
New, used by the Autoconf suite to cache and speed up most processing.
- --force, -f
Supported by autom4te, autoconf and autoheader.
- --include, -I
Replaces --autoconf-dir and --localdir in autoconf, autoheader,
autoupdate, and autoreconf.
- autoreconf
No longer passes --cygnus, --foreign, --gnits, --gnu, --include-deps:
automake options are to be given via AUTOMAKE_OPTIONS.
- autoreconf
Runs gettextize and libtoolize when appropriate.
- autoreconf
--m4dir is no longer supported.
- autoreconf
Now runs only in the specified directories, defaulting to `.',
but understands AC_CONFIG_SUBDIRS for dependent directories.
Before, it used to run on all the `configure.ac' found in the
current tree.
Independent packages are properly updated.
** Bug fixes
- The top level $prefix is propagated to the AC_CONFIG_SUBDIRS configures.
- AC_TRY_RUN
Under the user pressure, $? is finally available. Probably a mistake.
- AC_F77_LIBRARY_LDFLAGS now supports the HP/UX f90 compiler.
- Precious variables accumulation
config.status could stack several copies of the precious variables
assignments.
- AC_PATH_PROG and family.
Works properly when given a literal path.
- AC_FUNC_SETPGRP
Somewhere since 2.13, the result had been reversed.
** C Macros
- AC_C_BIGENDIAN supports the cross-compiling case.
- AC_C_BIGENDIAN accepts ACTION-IF-TRUE, ACTION-IF-FALSE, and
ACTION-IF-UNKNOWN arguments. All are facultative, and the default
for ACTION-IF-TRUE is to define WORDS_BIGENDIAN like AC_C_BIGENDIAN
always did.
- AC_C_LONG_DOUBLE now succeeds only if `long double' has more range or
precision than `double'.
** Generic macros
- AC_INIT
It now defines the preprocessor symbols PACKAGE_NAME,
PACKAGE_TARNAME, PACKAGE_VERSION, PACKAGE_STRING, and
PACKAGE_BUGREPORT.
- AC_INIT
Admits a fourth optional parameter: the tar name.
- AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS.
Provide the user with srcdir, ac_srcdir, ac_top_srcdir, ac_builddir,
ac_top_builddir, ac_abs_srcdir, ac_abs_top_srcdir, ac_abs_builddir,
ac_abs_top_builddir.
- AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS and AC_OUTPUT.
Are much less expensive when using long lists of files.
- AC_PREFIX_PROGRAM
Works with shell variables, and non alphanumeric names.
** Library macros
- AC_FUNC_STRERROR_R now sets STRERROR_R_CHAR_P, not HAVE_WORKING_STRERROR_R,
because POSIX 1003.1-200x draft 7 says strerror_r returns int, not char *.
- AC_FUNC_STRTOD substitutes POW_LIB.
- AC_FUNC_STRNLEN
New.
* Major changes in Autoconf 2.52
Released 2001-07-18 by Akim Demaille.
** Documentation
- AC_ARG_VAR
- Quadrigraphs
This feature was present in autoconf 2.50 but was not documented.
For example, `@<:@' is translated to `[' just before output. This
is useful when writing strings that contain unbalanced quotes, or
other hard-to-quote constructs.
- m4_pattern_forbid, m4_pattern_allow
- Tips for upgrading from 2.13.
- Using autoscan to maintain a configure.ac.
** Default includes
- Now include stdint.h.
- sys/types.h and sys/stat.h are guarded.
- strings.h is included if available, and not conflicting with string.h.
** Bug fixes
- The test suite is more robust and presents less false failures.
- Invocation of GNU M4 now robust to POSIXLY_CORRECT.
- configure accepts --prefix='' again.
- AC_CHECK_LIB works properly when its first argument is not a
literal.
- HAVE_INTTYPES_H is defined only if not conflicting with sys/types.h.
- build_, host_, and target_alias are AC_SUBST as in 2.13.
- AC_ARG_VAR properly propagates precious variables inherited from the
environment to ./config.status.
- Using --program-suffix/--program-prefix is portable.
- Failures to detect the default compiler's output extension are less
likely.
- `config.status foo' works properly when `foo' depends on variables
set in an AC_CONFIG_THING INIT-CMD.
- autoheader is more robust to broken input.
- Fixed Fortran name-mangling and link tests on a number of systems,
e.g. NetBSD; see AC_F77_DUMMY_MAIN, below.
** Generic macros
- AC_CHECK_HEADER and AC_CHECK_HEADERS support a fourth argument to
specify pre-includes. In this case, the headers are compiled with
cc, not merely preprocessed by cpp. Therefore it is the _usability_
of a header which is checked for, not just its availability.
- AC_ARG_VAR refuses to run configure when precious variables have
changed.
- Versions of compilers are dumped in the logs.
- AC_CHECK_TYPE recognizes use of `foo_t' as a replacement type.
** Specific Macros
- AC_PATH_XTRA only adds -ldnet to $LIBS if it's needed to link.
- AC_FUNC_WAIT3 and AC_SYS_RESTARTABLE_SYSCALLS are obsoleted.
- AM_FUNC_ERROR_AT_LINE, AM_FUNC_FNMATCH, AM_FUNC_MKTIME,
AM_FUNC_OBSTACK, and AM_FUNC_STRTOD are now activated.
Be sure to read `Upgrading from Version 2.13' to understand why
running `autoupdate' is needed.
- AC_F77_DUMMY_MAIN, AC_F77_MAIN: new macros to detect whether
a main-like routine is required/possible when linking C/C++ with
Fortran. Users of e.g. AC_F77_WRAPPERS should be aware of these.
- AC_FUNC_GETPGRG behaves better when cross-compiling.
* Major changes in Autoconf 2.51
There was no release of Autoconf 2.51 since some packagers had used
this version number without permission to ship intermediary versions
of 2.50. The version was skipped to avoid confusion.
* Major changes in Autoconf 2.50
Released 2001-05-21 by Akim Demaille.
** Lots of bug fixes
There have been far too many to enumerate them here. Check out
ChangeLog if you really want to know more.
** Improved documentation
In particular, portability issues are better covered.
** Use of Automake
All the standard GNU Makefile targets are supported. The layout has
changed: m4/ holds the M4 extensions Autoconf needs for its
configuration, doc/ contains the documentation, and tests/ contains
the test suite.
** Man pages are provided
For autoconf, autoreconf, autoupdate, autoheader, autoscan, ifnames,
config.guess, config.sub.
** autoconf
- --trace
Provides a safe and powerful means to trace the macro uses. This
provide the parsing layer for tools which need to `study'
configure.in.
- --warnings
Specify what category of warnings should be enabled.
- When recursing into subdirectories, try for configure.gnu before
configure to adapt for packages not using autoconf on case-insensitive
file systems.
- Diagnostics
More errors are now caught (circular AC_REQUIRE dependencies,
AC_DEFINE in the action part of an AC_CACHE_CHECK, too many pops
etc.). In addition, their location and call stack are given.
** autoupdate
autoupdate is much more powerful, and is able to provide the glue code
which might be needed to move from an old macro to its newer
equivalent.
You are strongly encouraged to use it to modernize both your
`configure.in' and your .m4 extension files.
** autoheader
The internal machinery of autoheader has completely changed. As a
result, using `acconfig.h' should be considered to be obsoleted, and
you are encouraged to get rid of it using the AH macros.
** autoreconf
Extensive overhaul.
** Fortran 77 compilers
Globally, the support for Fortran 77 is considerably improved.
Support for automatically determining a Fortran 77 compiler's
name-mangling scheme. New CPP macros F77_FUNC and F77_FUNC_ are
provided to wrap C/C++ identifiers, thus making it easier and more
transparent for C/C++ to call Fortran 77 routines, and Fortran 77 to
call C/C++ routines. See the Texinfo documentation for details.
** Test suite
The test suite no longer uses DejaGNU. It should be easy to submit
test cases in this new framework.
** configure
- --help, --help=long, -hl
no longer dumps useless items.
- --help=short, -hs
lists only specific options.
- --help=recursive, -hr
displays the help of all the embedded packages.
- Remembers environment variables when reconfiguring.
The previous scheme to set envvar before running configure was
ENV=VAL ./configure
what prevented configure from remembering the environment in which
it was run, therefore --recheck was run in an inconsistent
environment. Now, one should run
./configure ENV=VAR
and then --recheck will work properly. Variables declared with
AC_ARG_VAR are also preserved.
- cross-compilation
$build defaults to `config.guess`, $host to $build, and then $target
to $host.
Cross-compilation is a global status of the package, it no longer
depends upon the current language.
Cross compilation is enabled iff the user specified `--host'.
`configure' now fails if it can't run the executables it compiles,
unless cross-compilation is enabled.
- Cache file
The cache file is disabled by default. The new options
`--config-cache', `-C' set the cache to `config.cache'.
** config.status
- faster
Much faster on most architectures.
- concurrent executions
It is safe to use `make -j' with config.status.
- human interface improved
It is possible to invoke
./config.status foobar
instead of the former form (still valid)
CONFIG_COMMANDS= CONFIG_HEADERS= CONFIG_LINKS= \
CONFIG_FILES=foobar:foo.in:bar.in \
./config.status
The same holds for configuration headers and links.
You can instantiate unknown files and headers:
./config.status --header foo.h:foo.h.in --file bar:baz
- has a useful --help
- accepts special file name "-" for stdin/stdout
** Identity Macros
- AC_COPYRIGHT
Specify additional copyright information.
- AC_INIT
Now expects the identity of the package as argument.
** General changes.
- Uniform quotation
Most macros, if not all, now strictly follow the `one quotation
level' rule. This results in a more predictable expansion.
- AC_REQUIRE
A sly bug in the AC_REQUIRE machinery, which could produce incorrect
configure scripts, was fixed by Axel Thimm.
** Setup Macros
- AC_ARG_VAR
Document and ask for the registration of an envvar.
- AC_CONFIG_SRCDIR
Specifies the file which `configure' should look for when trying to
find the source tree (used to be handled by AC_INIT).
- AC_CONFIG_COMMANDS
To add new actions to config.status. Should be used instead of
AC_OUTPUT_COMMANDS.
- AC_CONFIG_LINKS
Replaces AC_LINK_FILES.
- AC_CONFIG_HEADERS, AC_CONFIG_COMMANDS, AC_CONFIG_SUBDIRS,
AC_CONFIG_LINKS, and AC_CONFIG_FILES
They now obey sh: you should no longer use shell variables as
argument. Instead of
test "$package_foo_enabled" = yes && $my_subdirs="$my_subdirs foo"
AC_CONFIG_SUBDIRS($my_subdirs)
write
if test "$package_foo_enabled" = yes; then
AC_CONFIG_SUBDIRS(foo)
fi
- AC_HELP_STRING
To format an Autoconf macro's help string so that it looks pretty
when the user executes `configure --help'.
** Generic Test Macros
- AC_CHECK families
The interface of the AC_CHECK families of macros (decl, header,
type, member, func) is now uniform. They support the same set of
default includes.
- AC_CHECK_DECL, AC_CHECK_DECLS
To check whether a symbol is declared.
- AC_CHECK_SIZEOF, AC_C_CHAR_UNSIGNED.
No longer need a cross-compilation default.
- AC_CHECK_TYPE
The test it performs is much more robust than previously, and makes
it possible to test builtin types in addition to typedefs.
It is now schizophrenic:
- AC_CHECK_TYPE(TYPE, REPLACEMENT)
remains for backward compatibility, but its use is discouraged.
- AC_CHECK_TYPE(TYPE, IF-FOUND, IF-NOT-FOUND, INCLUDES)
behaves exactly like the other AC_CHECK macros.
- AC_CHECK_TYPES
Checks whether given types are supported by the system.
- AC_CHECK_MEMBER, AC_CHECK_MEMBERS
Check for given members in aggregates (e.g., pw_gecos in struct
passwd).
- AC_PROG_CC_STDC
Checks if the compiler supports ISO C, included when needs special
options.
- AC_PROG_CPP
Checking whether the preprocessor indicates missing includes by the
error code. stderr is checked by AC_TRY_CPP only as a fallback.
- AC_LANG
Takes a language as argument and replaces AC_LANG_C,
AC_LANG_CPLUSPLUS and AC_LANG_FORTRAN77.
- AC_LANG_PUSH, AC_LANG_POP
Are preferred to AC_LANG_SAVE, AC_LANG_RESTORE.
** Specific Macros
- AC_FUNC_CHOWN, AC_FUNC_MALLOC, AC_FUNC_STRERROR_R,
AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK, AC_FUNC_STAT, AC_FUNC_LSTAT,
AC_FUNC_ERROR_AT_LINE, AC_FUNC_OBSTACK, AC_FUNC_STRTOD, AC_FUNC_FSEEKO.
New.
- AC_FUNC_GETGROUPS
Sets GETGROUPS_LIBS.
- AC_FUNC_GETLOADAVG
Defines `HAVE_STRUCT_NLIST_N_UN_N_NAME' instead of `NLIST_NAME_UNION'.
- AC_PROG_LEX
Now integrates `AC_DECL_YYTEXT' which is obsoleted.
- AC_SYS_LARGEFILE
Arrange for large-file support.
- AC_EXEEXT, AC_OBJEXT
You are no longer expected to use them: their computation is
performed by default.
** C++ compatibility
Every macro has been revisited in order to support at best CC=c++.
Major changes in Autoconf 2.14:
There was no release of GNU Autoconf 2.14.
Major changes in Autoconf 2.13:
Released 1999-05-01 by Ben Elliston.
* Support for building on Win32 systems where the only available C or
C++ compiler is the Microsoft Visual C++ command line compiler
(`cl'). Additional support for building on Win32 systems which are
using the Cygwin or Mingw32 environments.
* Support for alternative object file and executable file extensions.
On Win32, for example, these are .obj and .exe. These are discovered
using AC_OBJEXT and AC_EXEEXT, which substitute @OBJEXT@ and
@EXEEXT@ in the output, respectively.
* New macros: AC_CACHE_LOAD, AC_CACHE_SAVE, AC_FUNC_SELECT_ARGTYPES,
AC_VALIDATE_CACHED_SYSTEM_TUPLE, AC_SEARCH_LIBS, AC_TRY_LINK_FUNC,
AC_C_STRINGIZE, AC_CHECK_FILE(S), AC_PROG_F77 (and friends).
* AC_DEFINE now has an optional third argument for a description to be
placed in the config header input file (e.g. config.h.in).
* The C++ code fragment compiled for the C++ compiler test had to be
improved to include an explicit return type for main(). This was
causing failures on systems using recent versions of the EGCS C++
compiler.
* Fixed an important bug in AC_CHECK_TYPE that would cause a configure
script to report that `sometype_t' was present when only `type_t'
was defined.
* Merge of the FSF version of config.guess and config.sub to modernize
these scripts. Add support for a few new hosts in config.guess.
Incorporate latest versions of install-sh, mkinstalldirs and
texinfo.tex from the FSF.
* autoreconf is capable of running automake if necessary (and
applicable).
* Support for Fortran 77. See the Texinfo documentation for details.
* Bug fixes and workarounds for quirky bugs in vendor utilities.
Major changes in Autoconf 2.12:
Released 1996-11-26 by David J. MacKenzie
* AC_OUTPUT and AC_CONFIG_HEADER can create output files by
concatenating multiple input files separated by colons, like so:
AC_CONFIG_HEADER(config.h:conf.pre:config.h.in:conf.post)
AC_OUTPUT(Makefile:Makefile.in:Makefile.rules)
The arguments may be shell variables, to compute the lists on the fly.
* AC_LINK_FILES and AC_CONFIG_SUBDIRS may be called multiple times.
* New macro AC_OUTPUT_COMMANDS adds more commands to run in config.status.
* Bug fixes.
Major changes in Autoconf 2.11:
Released November 18th, 1996, by David J. MacKenzie
* AC_PROG_CC and AC_PROG_CXX check whether the compiler works.
They also default CFLAGS/CXXFLAGS to "-g -O2" for gcc, instead of "-g -O".
* AC_REPLACE_FUNCS defines HAVE_foo if the system has the function `foo'.
* AC_CONFIG_HEADER expands shell variables in its argument.
* New macros: AC_FUNC_FNMATCH, AC_FUNC_SETPGRP.
* The "checking..." messages and the source code for test programs that
fail are saved in config.log.
* Another workaround has been added for seds with small command length limits.
* config.sub and config.guess recognize more system types.
* Bug fixes.
Major changes in Autoconf 2.10:
Released May 7th, 1996, by Roland McGrath
* Bug fixes.
* The cache variable names used by `AC_CHECK_LIB(LIB, FUNC, ...)' has
changed: now $ac_cv_lib_LIB_FUNC, previously $ac_cv_lib_LIB.
Major changes in Autoconf 2.9:
Released March 16th, 1996, by Roland McGrath
* Bug fixes.
Major changes in Autoconf 2.8:
Released March 8th, 1996, by Roland McGrath
* Bug fixes.
Major changes in Autoconf 2.7:
Released November 22nd, 1995, by David J. MacKenzie
* Bug fixes.
Major changes in Autoconf 2.6:
Released November 20th, 1995, by David J. MacKenzie
* Bug fixes.
Major changes in Autoconf 2.5:
Released November 17th, 1995, by Roland McGrath
* New configure options --bindir, --libdir, --datadir, etc., with
corresponding output variables.
* New macro: AC_CACHE_CHECK, to make using the cache easier.
* config.log contains the command being run as well as any output from it.
* AC_CHECK_LIB can check for libraries with "." or "/" or "+" in their name.
* AC_PROG_INSTALL doesn't cache a name for install-sh, for sharing caches.
* AC_CHECK_PROG, AC_PATH_PROG, AC_CHECK_PROGS, AC_PATH_PROGS, and
AC_CHECK_TOOL can search a path other than $PATH.
* AC_CHECK_SIZEOF takes an optional size to use when cross-compiling.
Major changes in Autoconf 2.4:
Released June 14th, 1995, by David J. MacKenzie
* Fix a few bugs found by Emacs testers.
Major changes in Autoconf 2.3:
Released March 27th, 1995, by David J. MacKenzie
* Fix the cleanup trap in several ways.
* Handle C compilers that are picky about option placement.
* ifnames gets the version number from the right directory.
Major changes in Autoconf 2.2:
Released March 8th, 1995, by David J. MacKenzie
* The ifnames utility is much faster but requires a "new awk" interpreter.
* AC_CHECK_LIB and AC_HAVE_LIBRARY check and add the new
library before existing libs, not after, in case it uses them.
* New macros: AC_FUNC_GETPGRP, AC_CHECK_TOOL.
* Lots of bug fixes.
* Many additions to the TODO file :-)
Major changes in Autoconf 2.1:
Released November 4th, 1994, by David J. MacKenzie
* Fix C++ problems.
* More explanations in the manual.
* Fix a spurious failure in the testsuite.
* Clarify some warning messages.
* autoreconf by default only rebuilds configure and config.h.in files
that are older than any of their particular input files; there is a
--force option to use after installing a new version of Autoconf.
Thanks to everybody who's submitted changes and additions to Autoconf!
I've incorporated many of them, and am still considering others for
future releases -- but I didn't want to postpone this release indefinitely.
Caution: don't indiscriminately rebuild configure scripts with
Autoconf version 2. Some configure.in files need minor adjustments to
work with it; the documentation has a chapter on upgrading. A few
configure.in files, including those for GNU Emacs and the GNU C
Library, need major changes because they relied on undocumented
internals of version 1. Future releases of those packages will have
updated configure.in files.
It's best to use GNU M4 1.3 (or later) with Autoconf version 2.
Autoconf now makes heavy use of M4 diversions, which were implemented
inefficiently in GNU M4 releases before 1.3.
Major changes in Autoconf 2.0:
Released October 26th, 1994, by David J. MacKenzie
** New copyright terms:
* There are no restrictions on distribution or use of configure scripts.
** Documentation:
* Autoconf manual is reorganized to make information easier to find
and has several new indexes.
* INSTALL is reorganized and clearer and is now made from Texinfo source.
** New utilities:
* autoscan to generate a preliminary configure.in for a package by
scanning its source code for commonly used nonportable functions,
programs, and header files.
* ifnames to list the symbols used in #if and #ifdef directives in a
source tree.
* autoupdate to update a configure.in to use the version 2 macro names.
* autoreconf to recursively remake configure and configuration header
files in a source tree.
** Changed utilities:
* autoheader can take pieces of acconfig.h to replace config.h.{top,bot}.
* autoconf and autoheader can look for package-local definition files
in an alternate directory.
** New macros:
* AC_CACHE_VAL to share results of tests between configure runs.
* AC_DEFUN to define macros, automatically AC_PROVIDE them, and ensure
that macros invoked with AC_REQUIRE don't interrupt other macros.
* AC_CONFIG_AUX_DIR, AC_CANONICAL_SYSTEM, AC_CANONICAL_HOST, AC_LINK_FILES to
support deciding unguessable features based on the host and target types.
* AC_CONFIG_SUBDIRS to recursively configure a source tree.
* AC_ARG_PROGRAM to use the options --program-prefix,
--program-suffix, and --program-transform-name to change the names
of programs being installed.
* AC_PREFIX_DEFAULT to change the default installation prefix.
* AC_TRY_COMPILE to compile a test program without linking it.
* AC_CHECK_TYPE to check whether sys/types.h or stdlib.h defines a given type.
* AC_CHECK_LIB to check for a particular function and library.
* AC_MSG_CHECKING and AC_MSG_RESULT to print test results, on a single line,
whether or not the test succeeds. They obsolete AC_CHECKING and AC_VERBOSE.
* AC_SUBST_FILE to insert one file into another.
* AC_FUNC_MEMCMP to check whether memcmp is 8-bit clean.
* AC_FUNC_STRFTIME to find strftime even if it's in -lintl.
* AC_FUNC_GETMNTENT to find getmntent even if it's in -lsun or -lseq.
* AC_HEADER_SYS_WAIT to check whether sys/wait.h is POSIX.1 compatible.
** Changed macros:
* Many macros renamed systematically, but old names are accepted for
backward compatibility.
* AC_OUTPUT adds the "automatically generated" comment to
non-Makefiles where it finds @configure_input@ in an input file, to
support files with various comment syntaxes.
* AC_OUTPUT does not replace "prefix" and "exec_prefix" in generated
files when they are not enclosed in @ signs.
* AC_OUTPUT allows the optional environment variable CONFIG_STATUS to
override the file name "config.status".
* AC_OUTPUT takes an optional argument for passing variables from
configure to config.status.
* AC_OUTPUT and AC_CONFIG_HEADER allow you to override the input-file names.
* AC_OUTPUT automatically substitutes the values of CFLAGS, CXXFLAGS,
CPPFLAGS, and LDFLAGS from the environment.
* AC_PROG_CC and AC_PROG_CXX now set CFLAGS and CXXFLAGS, respectively.
* AC_PROG_INSTALL looks for install-sh or install.sh in the directory
specified by AC_CONFIG_AUXDIR, or srcdir or srcdir/.. or
srcdir/../.. by default.
* AC_DEFINE, AC_DEFINE_UNQUOTED, and AC_SUBST are more robust and smaller.
* AC_DEFINE no longer prints anything, because of the new result reporting
mechanism (AC_MSG_CHECKING and AC_MSG_RESULT).
* AC_VERBOSE pays attention to --quiet/--silent, not --verbose.
* AC_ARG_ENABLE and AC_ARG_WITH support whitespace in the arguments to
--enable- and --with- options.
* AC_CHECK_FUNCS and AC_CHECK_HEADERS take optional shell commands to
execute on success or failure.
* Checking for C functions in C++ works.
** Removed macros:
* AC_REMOTE_TAPE and AC_RSH removed; too specific to tar and cpio, and
better maintained with them.
* AC_ARG_ARRAY removed because no one was likely using it.
* AC_HAVE_POUNDBANG replaced with AC_SYS_INTERPRETER, which doesn't
take arguments, for consistency with all of the other specific checks.
** New files:
* Comes with config.sub and config.guess, and uses them optionally.
* Uses config.cache to cache test results. An alternate cache file
can be selected with the --cache-file=FILE option.
* Uses optional shell scripts $prefix/share/config.site and
$prefix/etc/config.site to perform site or system specific initializations.
* configure saves compiler output to ./config.log for debugging.
* New files autoconf.m4 and autoheader.m4 load the other Autoconf macros.
* acsite.m4 is the new name for the system-wide aclocal.m4.
* Has a DejaGnu test suite.
Major changes in Autoconf 1.11:
* AC_PROG_INSTALL calls install.sh with the -c option.
* AC_SET_MAKE cleans up after itself.
* AC_OUTPUT sets prefix and exec_prefix if they weren't set already.
* AC_OUTPUT prevents shells from looking in PATH for config.status.
Plus a few other bug fixes.
Major changes in Autoconf 1.10:
* autoheader uses config.h.bot if present, analogous to config.h.top.
* AC_PROG_INSTALL looks for install.sh in srcdir or srcdir/.. and
never uses cp.
* AC_PROG_CXX looks for cxx as a C++ compiler.
Plus several bugs fixed.
Major changes in Autoconf 1.9:
* AC_YYTEXT_POINTER replaces AC_DECLARE_YYTEXT.
* AC_SIZEOF_TYPE generates the cpp symbol name automatically,
and autoheader generates entries for those names automatically.
* AC_FIND_X gets the result from xmkmf correctly.
* AC_FIND_X assumes no X if --without-x was given.
* AC_FIND_XTRA adds libraries to the variable X_EXTRA_LIBS.
* AC_PROG_INSTALL finds OSF/1 installbsd.
Major changes in Autoconf 1.8:
** New macros:
* New macros AC_LANG_C, AC_LANG_CPLUSPLUS, AC_LANG_SAVE, AC_LANG_RESTORE,
AC_PROG_CXX, AC_PROG_CXXCPP, AC_REQUIRE_CPP
for checking both C++ and C features in one configure script.
* New macros AC_CHECKING, AC_VERBOSE, AC_WARN, AC_ERROR for printing messages.
* New macros AC_FIND_XTRA, AC_MMAP, AC_SIZEOF_TYPE, AC_PREREQ,
AC_SET_MAKE, AC_ENABLE.
** Changed macros:
* AC_FIND_X looks for X in more places.
* AC_PROG_INSTALL defaults to install.sh instead of cp, if it's in srcdir.
install.sh is distributed with Autoconf.
* AC_DECLARE_YYTEXT has been removed because it can't work, pending
a rewrite of quoting in AC_DEFINE.
* AC_OUTPUT adds its comments in C format when substituting in C files.
* AC_COMPILE_CHECK protects its ECHO-TEXT argument with double quotes.
** New or changed command line options:
* configure accepts --enable-FEATURE[=ARG] and --disable-FEATURE options.
* configure accepts --without-PACKAGE, which sets withval=no.
* configure accepts --x-includes=DIR and --x-libraries=DIR.
* Giving --with-PACKAGE no argument sets withval=yes instead of withval=1.
* configure accepts --help, --version, --silent/--quiet, --no-create options.
* configure accepts and ignores most other Cygnus configure options, and
warns about unknown options.
* config.status accepts --help, --version options.
** File names and other changes:
* Relative srcdir values are not made absolute.
* The values of @prefix@ and @exec_prefix@ and @top_srcdir@ get substituted.
* Autoconf library files are installed in ${datadir}/autoconf, not ${datadir}.
* autoheader optionally copies config.h.top to the beginning of config.h.in.
* The example Makefile dependencies for configure et al. work better.
* Namespace cleanup: all shell variables used internally by Autoconf
have names beginning with `ac_'.
More big improvements are in process for future releases, but have not
yet been (variously) finished, integrated, tested, or documented enough
to release yet.
Major changes in Autoconf 1.7:
* New macro AC_OBSOLETE.
* Bugs in Makefile.in fixed.
* AC_LONG_FILE_NAMES improved.
Major changes in Autoconf 1.6:
* New macro AC_LONG_64_BITS.
* Multiple .h files can be created.
* AC_FIND_X looks for X files directly if it doesn't find xmkmf.
* AC_ALLOCA defines C_ALLOCA if using alloca.c.
* --with-NAME can take a value, e.g., --with-targets=sun4,hp300bsd.
* Unused --no-create option to configure removed.
* autoheader doesn't change the timestamp of its output file if
the file didn't change.
* All macros that look for libraries now use AC_HAVE_LIBRARY.
* config.status checks three optional environment variables to
modify its behavior.
* The usual bug fixes.
Major changes in Autoconf 1.5:
* New macros AC_FIND_X, AC_OFF_T, AC_STAT_MACROS_BROKEN, AC_REVISION.
* autoconf and autoheader scripts have GNU standards conforming
--version and --help options (they print their message and exit).
* Many bug fixes.
Major changes in Autoconf 1.4:
* New macros AC_HAVE_POUNDBANG, AC_TIME_WITH_SYS_TIME, AC_LONG_DOUBLE,
AC_GETGROUPS_T, AC_DEFINE_UNQUOTED.
* autoconf and autoheader use the M4 environment variable to determine the
name of the M4 program to use.
* The --macrodir option to autoconf and autoheader specifies the directory
in which acspecific.m4, acgeneral.m4, etc. reside if not the default.
* autoconf and autoheader can take `-' as their file names, which means to
read stdin as input.
* Resulting configure scripts can take a --verbose option which causes them
to print the results of their tests.
* AC_DEFINE quotes its second argument in such a way that spaces, magic
shell characters, etc. will be preserved during various stages of
expansion done by the shell. If you don't want this, use
AC_DEFINE_UNQUOTED instead.
* Much textual processing done with external calls to tr and sed have been
internalized with builtin M4 `patsubst' and `translit' calls.
* AC_OUTPUT doesn't hardwire the file names it outputs. Instead, you can
set the shell variables `gen_files' and `gen_config' to the list of
file names to output.
* AC_DECLARE_YYTEXT does an AC_SUBST of `LEX_OUTPUT_ROOT', which may be
"lex.yy" or "lexyy", depending on the system.
* AC_PROGRAMS_CHECK takes an optional third arg. If given, it is used as
the default value.
* If AC_ALLOCA chooses alloca.c, it also defines STACK_DIRECTION.
* AC_CONST works much more reliably on more systems.
* Many bug fixes.
Major changes in Autoconf 1.3:
configure no longer requires awk for packages that use a config.h.
Support handling --with-PACKAGE options.
New `autoheader' script to create `config.h.in' from `configure.in'.
Ignore troublesome -lucb and -lPW when searching for alloca.
Rename --exec_prefix to --exec-prefix for GNU standards conformance.
Improve detection of STDC library.
Add AC_HAVE_LIBRARY to check for non-default libraries.
Function checking should work with future GNU libc releases.
Major changes in Autoconf 1.2:
The --srcdir option is now usually unnecessary.
Add a file containing sample comments describing CPP macros.
A comment in config.status tells which host it was configured on.
Substituted variable values can now contain commas.
Fix bugs in various feature checks.
Major changes in Autoconf 1.1:
Added AC_STRCOLL macro.
Made AC_GETLOADAVG check for more things.
AC_OUTPUT argument is now optional.
Various bug fixes.
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