Add libexecinfo from FreeBSD

* Implements backtrace() and a few other functions with the same API as
glibc.
* Useful for porting linux specific things, and for debugging.

sys-libs/libexecinfo/libexecinfo-1.1.recipe

@@ -0,0 +1,75 @@
+SUMMARY="Library for inspecting program's backtrace"
+DESCRIPTION="
+This is a quick-n-dirty BSD licensed clone of backtrace facility found
+in the GNU libc, mainly intended for porting linuxish code to BSD
+platforms, however it can be used at any platform which has a gcc
+compiler.
+"
+HOMEPAGE="http://www.freshports.org/devel/libexecinfo"
+COPYRIGHT="2003-2014 Maxim Sobolev"
+LICENSE="BSD (2-clause)"
+SRC_URI="http://ftp.freebsd.org/pub/FreeBSD/ports/local-distfiles/itetcu/libexecinfo-1.1.tar.bz2"
+CHECKSUM_SIZE="4841"
+CHECKSUM_RMD160="b2227d4095be0002185b667b9fde71cd876a4ed7"
+CHECKSUM_SHA512="51fea7910ef6873061a25c22434ce4da724e9d8e37616a069ad0a58c0463755be4c6c7da88cd747484c2f3373909d7be4678b32a4bd91b6d9e0f74526094e92c"
+REVISION="1"
+ARCHITECTURES="x86_gcc2"
+SECONDARY_ARCHITECTURES="x86"
+
+PROVIDES="
+	libexecinfo$secondaryArchSuffix = $portVersion compat >= 1
+	lib:libexecinfo$secondaryArchSuffix = $portVersion compat >= 1
+	"
+REQUIRES="
+	haiku$secondaryArchSuffix >= $haikuVersion
+	"
+BUILD_REQUIRES="
+	"
+BUILD_PREREQUIRES="
+	haiku${secondaryArchSuffix}_devel >= $haikuVersion
+	cmd:gcc$secondaryArchSuffix
+	cmd:ld$secondaryArchSuffix
+	cmd:make
+	"
+
+PATCHES="libexecinfo-$portVersion.patchset"
+
+BUILD()
+{
+	gcc -c -o execinfo.o execinfo.c
+	gcc -c -o stacktraverse.o stacktraverse.c
+	ar rcs libexecinfo.a execinfo.o stacktraverse.o
+	gcc -shared -Wl,-soname,libexecinfo.so.1.1 -o libexecinfo.so execinfo.o stacktraverse.o
+}
+
+INSTALL()
+{
+	mkdir -p $libDir
+	mkdir -p $includeDir
+
+	cp libexecinfo.a $libDir
+	cp libexecinfo.so $libDir
+	cp execinfo.h $includeDir
+
+	prepareInstalledDevelLibs libexecinfo
+
+	# devel package
+	packageEntries devel \
+		$developDir
+}
+
+TEST()
+{
+	gcc test.c -o test libexecinfo.a
+	./test
+}
+
+# ----- devel package -------------------------------------------------------
+
+PROVIDES_devel="
+	libexecinfo${secondaryArchSuffix}_devel = $portVersion compat >= 1
+	devel:libexecinfo${secondaryArchSuffix} = $portVersion compat >= 1
+	"
+REQUIRES_devel="
+	libexecinfo${secondaryArchSuffix} == $portVersion base
+	"

sys-libs/libexecinfo/patches/libexecinfo-1.1.patchset

@@ -0,0 +1,75 @@
+From 9618f81449961ea9f5c6d85e45aab86a6b4a16c7 Mon Sep 17 00:00:00 2001
+From: Adrien Destugues <pulkomandy@pulkomandy.tk>
+Date: Thu, 17 Apr 2014 11:06:49 +0200
+Subject: Import FreeBSD patches.
+
+
+diff --git a/execinfo.c b/execinfo.c
+index 906fb14..9448b60 100644
+--- a/execinfo.c
++++ b/execinfo.c
+@@ -69,7 +69,8 @@ backtrace(void **buffer, int size)
+ char **
+ backtrace_symbols(void *const *buffer, int size)
+ {
+-    int i, clen, alen, offset;
++    size_t clen, alen;
++    int i, offset;
+     char **rval;
+     char *cp;
+     Dl_info info;
+@@ -78,7 +79,6 @@ backtrace_symbols(void *const *buffer, int size)
+     rval = malloc(clen);
+     if (rval == NULL)
+         return NULL;
+-    (char **)cp = &(rval[size]);
+     for (i = 0; i < size; i++) {
+         if (dladdr(buffer[i], &info) != 0) {
+             if (info.dli_sname == NULL)
+@@ -92,14 +92,14 @@ backtrace_symbols(void *const *buffer, int size)
+                    2 +                      /* " <" */
+                    strlen(info.dli_sname) + /* "function" */
+                    1 +                      /* "+" */
+-                   D10(offset) +            /* "offset */
++                   10 +                     /* "offset */
+                    5 +                      /* "> at " */
+                    strlen(info.dli_fname) + /* "filename" */
+                    1;                       /* "\0" */
+             rval = realloc_safe(rval, clen + alen);
+             if (rval == NULL)
+                 return NULL;
+-            snprintf(cp, alen, "%p <%s+%d> at %s",
++            snprintf((char *) rval + clen, alen, "%p <%s+%d> at %s",
+               buffer[i], info.dli_sname, offset, info.dli_fname);
+         } else {
+             alen = 2 +                      /* "0x" */
+@@ -108,12 +108,15 @@ backtrace_symbols(void *const *buffer, int size)
+             rval = realloc_safe(rval, clen + alen);
+             if (rval == NULL)
+                 return NULL;
+-            snprintf(cp, alen, "%p", buffer[i]);
++            snprintf((char *) rval + clen, alen, "%p", buffer[i]);
+         }
+-        rval[i] = cp;
+-        cp += alen;
++        rval[i] = (char *) clen;
++        clen += alen;
+     }
+ 
++    for (i = 0; i < size; i++)
++        rval[i] += (long) rval;
++
+     return rval;
+ }
+ 
+@@ -155,6 +158,6 @@ backtrace_symbols_fd(void *const *buffer, int size, int fd)
+                 return;
+             snprintf(buf, len, "%p\n", buffer[i]);
+         }
+-        write(fd, buf, len - 1);
++        write(fd, buf, strlen(buf));
+     }
+ }
+-- 
+1.8.3.4
+