On most systems, "D" (deterministic) is now the default archiving mode,
and so specifying "u" will throw a warning that "D" is being used anyway.
Jam previously assumed, as it was passing "u", that the timestamps inside
.a's were valid when they were actually 0, which was leading to spurious
rebuilds of .as.
After this change, we assume archives cannot be scanned for timestamps,
which should stop the spurious rebuilds of targets on most systems.
Hopefully this is enough to satisfy the license requirements.
Remove some of the "LOCAL CHANGE" comments as a result (ones about
the HeaderCache remain.)
If setting OPTIM by jam basically makes it impossible for the project that
is using jam to set its own optimization level while still allowing user
to override that in command line. For example in Haiku jam files there is
line like this: "OPTIM ?= -O2", which obviously is meant to set optimization
level to O2 unless user overwrites it. Unfortunately, because Jam have already
set OPTIM to -O this line never had an intended effect.
After this Jam no longer thinks it knows best what is good for projects
that are using it and Haiku is by default compiled with -O2.
Signed-off-by: Paweł Dziepak <pdziepak@quarnos.org>
* On Haiku, the jam install folder should be /boot/common.
git-svn-id: file:///srv/svn/repos/haiku/buildtools/trunk@32875 a95241bf-73f2-0310-859d-f6bbb57e9c96
