[Bug target/58446] New: Support for musl libc

[Bug target/58446] New: Support for musl libc

[gcc-bug-espfv4bhi9 at gregor dot im]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

            Bug ID: 58446
           Summary: Support for musl libc
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gcc-bug-espfv4bhi9 at gregor dot im

Created attachment 30829
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30829&action=edit
gcc/ arch-generic configuration and fixes for musl

The attached patches add support for targeting the musl C library for Linux,
http://musl-libc.org/

The patches are:

gcc-config-musl.diff: Addition of -mmusl (akin to -mglibc, -muclibc, -mbionic)
for musl libc support, as well as support for using the musl ld.so, patch to
stddef.h for musl size_t support, etc. Most controversially, redefines the
include dir ordering iff musl is the default target.

gomp-posix.diff: Not directly related to musl, a fix to libgomp to make it
properly specify required POSIX version.

gcc-config-dliterate.diff: gcc_cv_target_dl_iterate_phdr=yes for musl

libssp.diff: Support for libcs which provide libssp functions in libc (of which
musl is the only example at present)

x86.diff, arm.diff, mips.diff, powerpc.diff, aarch64.diff: ld.so specification
for each target and related fixes.

[Bug target/58446] Support for musl libc

[gcc-bug-espfv4bhi9 at gregor dot im]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

--- Comment #1 from Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> ---
Created attachment 30830
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30830&action=edit
Fix for gomp to specify _POSIX_SOURCE requirements

[Bug target/58446] Support for musl libc

[gcc-bug-espfv4bhi9 at gregor dot im]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

--- Comment #2 from Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> ---
Created attachment 30831
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30831&action=edit
gcc_cv_target_dl_iterate_phdr=yes on musl (note that due to a bug in making
these .diffs, the configure.ac change is in libssp.diff ...)

[Bug target/58446] Support for musl libc

[gcc-bug-espfv4bhi9 at gregor dot im]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

--- Comment #3 from Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> ---
Created attachment 30832
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30832&action=edit
libssp support for musl

[Bug target/58446] Support for musl libc

[gcc-bug-espfv4bhi9 at gregor dot im]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

--- Comment #4 from Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> ---
Created attachment 30833
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30833&action=edit
x86/x86_64 support for musl

[Bug target/58446] Support for musl libc

[gcc-bug-espfv4bhi9 at gregor dot im]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

--- Comment #5 from Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> ---
Created attachment 30834
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30834&action=edit
arm support for musl

[Bug target/58446] Support for musl libc

[gcc-bug-espfv4bhi9 at gregor dot im]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

--- Comment #7 from Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> ---
Created attachment 30836
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30836&action=edit
powerpc support for musl

[Bug target/58446] Support for musl libc

[gcc-bug-espfv4bhi9 at gregor dot im]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

--- Comment #6 from Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> ---
Created attachment 30835
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30835&action=edit
mips support for musl

[Bug target/58446] Support for musl libc

[gcc-bug-espfv4bhi9 at gregor dot im]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

--- Comment #8 from Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> ---
Created attachment 30837
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30837&action=edit
aarch64 support for musl

[Bug target/58446] Support for musl libc

[joseph at codesourcery dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

--- Comment #10 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Tue, 17 Sep 2013, gcc-bug-espfv4bhi9 at gregor dot im wrote:

> libssp.diff: Support for libcs which provide libssp functions in libc (of which
> musl is the only example at present)

glibc provides libssp functions since version 2.4.  Apparently some people 
have a use for building libssp anyway (see bug 58312), but I'd think the 
build / installation of libssp should be disabled by default for glibc 
targets.  (Though given this is a per-multilib matter, disabling may mean 
just avoiding building / installing anything rather than completely 
disabling the directory at toplevel.)

Likewise, according to gcc/configure.ac, Bionic, and uClibc configured 
with __UCLIBC_HAS_SSP__.

[Bug target/58446] Support for musl libc

[gcc-bug-espfv4bhi9 at gregor dot im]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

--- Comment #11 from Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> ---
Aha. I didn't realize such a setting already existed; I'll test and update my
patch later today to use the existing mechanism. Thanks for the info.

[Bug target/58446] Support for musl libc

[gcc-bug-espfv4bhi9 at gregor dot im]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #30831|0                           |1
        is obsolete|                            |
  Attachment #30832|0                           |1
        is obsolete|                            |

--- Comment #12 from Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> ---
Created attachment 30864
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30864&action=edit
Changes to gcc/configure.ac for musl

Making libssp use the same system as everything else. (I'll leave the
whether-to-build-libssp debate to future generations :) )

[Bug target/58446] Support for musl libc

[gcc-bug-espfv4bhi9 at gregor dot im]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #30834|0                           |1
        is obsolete|                            |

--- Comment #13 from Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> ---
Created attachment 30865
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30865&action=edit
arm support for musl

This change to arm.diff adds support for musl's -eb and -hf linkers
(/lib/ld-musl-arm[eb][hf].so.1)

[Bug target/58446] Support for musl libc

[gcc-bug-espfv4bhi9 at gregor dot im]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #30835|0                           |1
        is obsolete|                            |

--- Comment #14 from Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> ---
Created attachment 30866
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30866&action=edit
mips support for musl

And the equivalent change for MIPS (/lib/ld-musl-mips[el].so.1)

[Bug target/58446] Support for musl libc

[david.heidelberger at ixit dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

David Heidelberger (okias) <david.heidelberger at ixit dot cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |david.heidelberger at ixit dot cz

--- Comment #15 from David Heidelberger (okias) <david.heidelberger at ixit dot cz> ---
in which state is musl patches integration?

btw. here is also old bug #55807

[Bug target/58446] Support for musl libc

[nsz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

nsz at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lu_zero at gentoo dot org

--- Comment #16 from nsz at gcc dot gnu.org ---
*** Bug 55807 has been marked as a duplicate of this bug. ***

[Bug target/58446] Support for musl libc

[nsz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

nsz at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nsz at gcc dot gnu.org

--- Comment #17 from nsz at gcc dot gnu.org ---
gcc-trunk has most of the musl support patches (not backported yet to any
release branch), the current state:

libitm fix:
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=222325

fixincludes support:
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=222327

unwind support:
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=222328

gthread support:
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=222329

config changes:
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=222904

stdint changes:
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=222905

aarch64 support:
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=223766

arm support:
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=223749

mips support:
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=222915

x86 support:
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=223218

microblaze support: not yet committed
https://gcc.gnu.org/ml/gcc-patches/2015-05/msg00437.html

powerpc support: not yet committed
https://gcc.gnu.org/ml/gcc-patches/2015-04/msg01640.html

sh support: not yet committed
https://gcc.gnu.org/ml/gcc-patches/2015-04/msg01636.html