The GCC projected released version 4.7.2 on 20 September. There were few
diff changes (only core and ada) between it and version 4.7.1, so it's a
straightforward update.
Release announcement: http://gcc.gnu.org/ml/gcc/2012-09/msg00181.html
Notable Excerpts:
GCC 4.7.2 is the first bug-fix release containing important fixes for
regressions and serious bugs in GCC 4.7.1 with over 70 bugs fixed since
the previous release
A notable change in GCC 4.7.2 compared to 4.7.1 are ABI bug fixes
related to some C++11 templates (std::list and std::pair). As a result,
code using those templates in C++11 mode is again ABI compatible with
code in C++03/C++98 mode or C++11 mode of GCC 4.6 and earlier, but might
be ABI incompatible with code compiled by GCC 4.7.1 or 4.7.0 in C++11
mode.
The libraries of gcc-aux are not located on standard search paths for
the runtime linker to find. Moreover, libraries from other versions
of gcc may be and in that case rtld will link the wrong library. To
fix this, an rpath to ${PREFIX}/gcc-aux/lib will be inserted into every
dynamic binary created by gcc-aux.
Other changes include:
1) simpler and more robust detection of an existing gcc-aux compiler to
be used rather than the older bootstrap compiler.
2) Fixed FreeBSD support. FreeBSD bootstraps are available but not yet
listed due to lack of testing (however, it should work out of the box)
3) Fixed some c++ testsuite directives for dejagnu
The condition in the gcc-aux buildlink3.mk file requires the file
mk/pkg-build-options.mk to be included in order to work. This fixes the
bug introduced yesterday.
The NLS option is optional, but the buildlink pulled in gettext-lib
unconditionally. This caused failures in Tinderbox and pbuld chroot
when gettext-lib couldn't be found in those clean environments. The
final result is that all Ada programs file to build in those environments.
Also removed whitespace from DESC.
Until now, GCC builders had to choose between Ada and C/C++ on the
following platforms:
i386-FreeBSD
i386-DragonFly
On these platforms, depending on the value of the configuration macro
TARGET_96_ROUND_53_LONG_DOUBLE, either Ada precision or C/C++ long
double precision was broken. The reason is that the floating point unit
of these platforms round off real-time calculations to 53-bit mantissas.
GCC will adjust accordingly to compensate. Since a common backend is used
for all languages, one had to choice which language they wanted correct.
The solution is to break out the object file responsible for this from
the common backend library. Ada now receives an altered version of
insn-modes.o, one that instructs the FPU not to round off the results.
This is all handled by patched Makefiles.
Other changes:
- Configure DragonFly to add ".note.GNU-stack" section to assembly files
to determine if program needs executable stacks
- Skip 2 subtests of Wconversion-real on i386 FreeBSD and DragonFly.
Due to the rounding behavior mentioned above, they fail to produce
error messages as expected. It's not possible to set target with
xfail, and every target && target seems not work work. So we will
assume all gcc-aux platform targets are long-double capabile and
just set xfail for x86 FreeBSD and DragonFly.
- Rework Fortran large real test 2 to skip on x86_64 *BSD. This test
should pass on x86 machines.
- Rework Fortran large real test 3 to be skipped when compiles with -O0
only x86_64 machines. All other combinations will pass.
- Rename C format test typedef from quad_t to quad2_t. DragonFly
has a standard type called quad_t and the type conflict causes a
large number of gcc tests to fail.
- Add dummy dg-error line to avoid an assembly comparison tests on
large files not built (test was marked as UNSUPPORTED but dejagnu is
too dumb to know not to check for the tests' products.)
- Reorder path passed during build when using an already-built gcc-aux
compiler to build new compiler. If gnat-aux is also installed, it
would use the gnat* tools from that compiler rather than gcc-aux
which results in build failure (different versions of tools are
getting used together resulting in build failure).
The primary difference between this compiler package and lang/gcc47 is
that lang/gcc-aux supports the Ada language. Additionally, it is
intended that the USE_LANGUAGES makefile variable whill be extended to
recognize "ada" as a valid language, and that specifying it will cause
lang/gcc-aux to be used to build the package.
All current Ada-based packages will be modified to build with
USE_LANGUAGES+= ada rather than specifying a dependency on lang/gnat-aux,
the other Ada-capable compiler in pkgsrc based on gcc-4.6.3.
lang/gcc-aux supports C, C++, Objective-C, Fortran, and Ada by default,
but the latter four languages can be disabled via the options framework.
The three non-default options are "nls", "testsuite" and "static" which
enable Native Language Support, languages tests, and building the compiler
statically.
The "static" option is unalterably enabled for NetBSD in order to use dl_iterate_phdr error handling on NetBSD 6. On the NetBSD 6 beta builds,
exceptions won't unwind properly with the libgcc_s shared library, and
the issue seems to be external to gcc-aux. It's hoped the libgcc_s
exception handling works on NetBSD 5.x series as dl_iterate_phdr isn't
supported by rtld there, but gcc-aux hasn't been tested on 5.x yet.
lang/gcc-aux can be built by 5 platforms currently: NetBSD i386/x86_64,
DragonFly i386/x86_64, and OpenSolaris i386. New platform support
requires new bootstraps. FreeBSD i386/x86_64 could be added easily as
bootstrap compilers are available for FreeBSD ports lang/gnat-aux.
OpenBSD bootstrap compilers have been built but never used, but further
patches are on a couple of gcc's configuration files are needed as well
as testing to provide OpenBSD support.
All five platforms pass all tests (over 3200) in the Ada testsuite.
See http://gcc.gnu.org/gcc-4.7/changes.html
for more information about improvements over the GCC 4.6 series.
