atomicity.cc has moved into libsupc++ for everyone.

this was a workaround we applied for sparc in PR#54660, and
now is used for all platforms.

pull in atomicity.h (atomicity.cc) on sparc. 3 of the objects
use these interfaces and this avoids link errors

fixes PR#54660.

begin to handle new unwind.h and gthr-default.h stuff.
put gthr stuff in a common makefile.

remove ancient unused Makefile.srcs.

WARNS=1

port over 3 changes made here in the GCC 4.5 tree that we'll need
when GCC 4.8 becomes "gcc.old" eventually.

this tree still needs to be tested for more, but this should be the
bulk of the work.

--

port over 3 changes made here in the GCC 4.5 tree that we'll need
when GCC 4.8 becomes "gcc.old" eventually.

this tree still needs to be tested for more, but this should be the
bulk of the work.

----
Log Message:
prepare for moving GCC 4.5 into gcc.old:

- convert to using ${EXTERNAL_GCC_SUBDIR}
- define base-external-gpl3-gcc* subdir as GCC_SUBDIR
- use <bsd.init.mk> over <bsd.own.mk> for a bunch of places; mostly
because it arranges for ../Makefile.inc to be included earlier, and
don't bother including the latter if the former is already included.
- move all .PATH: settings after <bsd.{own,lib}.mk> so that all
valid variables are set before it is evaluated
- rename mknative-gcc* to match their subdir name.

XXX the relationship between the Makefile.inc/Makefile.gcc_path files
is kind of sketchy, it would be great if this was fixed.

----
Log Message:
oops, avoid re-setting DIST to something that might be wrong now.

----
Log Message:
fix another dated DIST.

show more ...

move the -std=gnu++0x code from Makefile to Makefile.common.
fixes the remaining 2/3 link issues.

Skip assembler helpers when using HAVE_LIBGCC_EH=no. Always use the
generic unwind.h version in that case, even on ARM.

merge GCC 4.8 build.

prepare for moving GCC 4.5 into gcc.old:

- convert to using ${EXTERNAL_GCC_SUBDIR}
- define base-external-gpl3-gcc* subdir as GCC_SUBDIR
- use <bsd.init.mk> over <bsd.own.mk> for a bunch of places;

prepare for moving GCC 4.5 into gcc.old:

- convert to using ${EXTERNAL_GCC_SUBDIR}
- define base-external-gpl3-gcc* subdir as GCC_SUBDIR
- use <bsd.init.mk> over <bsd.own.mk> for a bunch of places; mostly
because it arranges for ../Makefile.inc to be included earlier, and
don't bother including the latter if the former is already included.
- move all .PATH: settings after <bsd.{own,lib}.mk> so that all
valid variables are set before it is evaluated
- rename mknative-gcc* to match their subdir name.

XXX the relationship between the Makefile.inc/Makefile.gcc_path files
is kind of sketchy, it would be great if this was fixed.

show more ...

More evbarmv5 fixes.

Can't build libstdc++ and libsupc++ with clang since it depends on using
volatiles as initializers of non-volatile fields, void * arithmetic and
some new attributes for the unwinding.

libstdc++-v3/libmath subdir is gone.

fix some more paths for GCC 4.5.

*sigh* move these files into the directories i meant for them to exist in.
start actually porting to gcc 4.5 in the process.