To confirm: Yes, I've signed the FSF copyright assignment document, and
yes we've discussed the changes relative to my own (which were mostly
just cleanups and sanity anyway). I'm Gregor Richards and I approve this
message.
With valediction,
- Gregor Richards
On 04/20/2015 02:49 PM, Szabolcs Nagy wrote:
This patch set adds musl libc[0] support to GCC.
The patches were originally developed by Gregor Richards[1][2],
who I believe have already done the FSF copyright assignment and agrees
with the changes I made (please verify). I only did minor cleanups
to make the patches better suited for upstream.
Issues I don't have patches for:
* On powerpc it seems the only configure option to choose the default
long-double abi is --with-long-double-128, but that's the default with
sufficiently new glibc. (musl gets 64bit long-double because the glibc
version check fails, this is ok, because there is no ibm128 support in
musl, but it would be better if --with-long-double-64 could be set
explicitly or even ieee128 abi if gcc supports that).
* libcilkrts uses pthread_yield on linux instead of sched_yield by
default, but musl does not have the non-standard pthread_yield symbol.
Tests:
I only tested the C and C++ languages. GCJ needs further patching,
I haven't tested gfortran nor Ada. libsanitizer has to be disabled
for musl. I built cross compilers for various targets musl supports
and ran x86_64-linux-musl cross compiler (musl target glibc host)
and native musl make check. There were several errors, some of the
causes:
* libcilkrts.so has undefined ref to pthread_yield
* ifunc is not supported by musl
* ifunc is used in x86 libatomic.so for __atomic_store_16
* gcc stdatomic.h has some incompatible typedefs with musl stdint.h
* musl does not support unwind across libc calls or signal handlers
* splitstacks does not work (undef refs to __morestack* in libgcc)
* musl does not yet have __memcpy_chk etc.
* -fshort-wchar is not supported
* i've seen x86 specific avx failures
* atexit during exit fails with musl (some c++ destructor tests)
This fixes BZ 58446 and 55807 which requested musl support.
[0] http://www.musl-libc.org/
[1] https://github.com/GregorR/musl-gcc-patches
[2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446
--
Changes:
fixincludes/mkfixinc.sh | 3 +-
gcc/config.gcc | 9 ++-
gcc/config/aarch64/aarch64-linux.h | 8 ++
gcc/config/arm/linux-eabi.h | 17 +++++
gcc/config/i386/linux.h | 1 +
gcc/config/i386/linux64.h | 4 +
gcc/config/i386/pmm_malloc.h | 9 ++-
gcc/config/linux.h | 105 +++++++++++++++++++++++----
gcc/config/linux.opt | 4 +
gcc/config/microblaze/linux.h | 16 +++-
gcc/config/mips/linux.h | 7 ++
gcc/config/rs6000/linux64.h | 12 ++-
gcc/config/rs6000/secureplt.h | 1 +
gcc/config/rs6000/sysv4.h | 16 +++-
gcc/config/sh/linux.h | 7 ++
gcc/configure | 7 ++
gcc/configure.ac | 7 ++
libgcc/unwind-dw2-fde-dip.c | 6 ++
libgfortran/acinclude.m4 | 2 +-
libgfortran/configure | 2 +-
libitm/config/arm/hwcap.cc | 2 +-
libitm/config/linux/x86/tls.h | 8 +-
libstdc++-v3/config/os/generic/os_defines.h | 5 ++
libstdc++-v3/configure.host | 3 +
24 files changed, 227 insertions(+), 34 deletions(-)
