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[Bug libc/21913] static binaries SIGSEGV in __brk when host's gcc is pie-by-default (i386)

--- Comment #10 from cvs-commit at gcc dot <cvs-commit at gcc dot> ---
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The branch, hjl/pie/static has been created
        at  6a41eb77cc1bb9926c1edcb41f934ad96b43a9d1 (commit)

- Log -----------------------------------------------------------------;h=6a41eb77cc1bb9926c1edcb41f934ad96b43a9d1

commit 6a41eb77cc1bb9926c1edcb41f934ad96b43a9d1
Author: H.J. Lu <>
Date:   Tue Jul 18 10:42:48 2017 -0700

    Use hidden visibility for libc.a with PIC

    Size comparison of static PIE elf/ldconfig:

    On x86-64:
            text           data     bss     dec     hex
    Before: 866113        22952    6336  895401   da9a9
    After : 865921        22952    6336  895209   da8e9
    On i686:
            text           data     bss     dec     hex
    Before: 782692        12296    3748  798736   c3010
    After : 781153        12280    3748  797181   c29fd;h=db2e81b0bb258f9b0b92930bbdf1cbe7bd87c2cd

commit db2e81b0bb258f9b0b92930bbdf1cbe7bd87c2cd
Author: H.J. Lu <>
Date:   Mon Jul 17 13:53:52 2017 -0700

    Add _dl_relocate_static_pie;h=bff6385dd7f7548290cdf099438153bcae45d93a

commit bff6385dd7f7548290cdf099438153bcae45d93a
Author: H.J. Lu <>
Date:   Mon Jul 17 08:54:40 2017 -0700

    Define pie-default/default-pie-ldflag for --enable-static-pie

    1. Add $(pie-default) to CFLAGS-.o and CFLAGS-.op.
    2. Add $(default-pie-ldflag) to +link-static-before-libc.
    3. Define +prectorT/+postctorT to $(+prectorS)/$(+postctorS).;h=65a3c646b5cf6c8f0ea5804274e6167f397a1206

commit 65a3c646b5cf6c8f0ea5804274e6167f397a1206
Author: H.J. Lu <>
Date:   Tue Jul 18 05:58:21 2017 -0700

    x86-64: Check if linker supports static PIE

    Need the linker with fix for:

    Binutils 2.29 is OK.;h=66af3e71af2583d41a4eaa77781bd99110723384

commit 66af3e71af2583d41a4eaa77781bd99110723384
Author: H.J. Lu <>
Date:   Mon Jul 17 08:36:45 2017 -0700

    Add --enable-static-pie;h=319fc7c7e5fa501263e4408673d63288a846d5d7

commit 319fc7c7e5fa501263e4408673d63288a846d5d7
Author: H.J. Lu <>
Date:   Sun Jul 23 05:26:26 2017 -0700

    Check if -static and -pie work together;h=c5cf3025294f43c1f8fd6d28fd4faf3504d81047

commit c5cf3025294f43c1f8fd6d28fd4faf3504d81047
Author: H.J. Lu <>
Date:   Fri Jul 21 05:07:19 2017 -0700

    Check if -static-pie works;h=add31350f0d488372cfd6a426e434856db613584

commit add31350f0d488372cfd6a426e434856db613584
Author: H.J. Lu <>
Date:   Mon Jul 17 08:17:32 2017 -0700

    Check if linker supports --no-dynamic-linker;h=66ee1f78e0bab3f3720bb99ae2a05c000bbefac6

commit 66ee1f78e0bab3f3720bb99ae2a05c000bbefac6
Author: H.J. Lu <>
Date:   Wed Jul 19 14:32:42 2017 -0700

    i386: Add _startup_sbrk and _startup_fatal [BZ #21913]

    On Linux/i386, there are 3 ways to make a system call:

    1. call *%gs:SYSINFO_OFFSET.  This requires TLS initialization.
    2. call *_dl_sysinfo.  This requires relocation of _dl_sysinfo.
    3. int $0x80.  This is slower than #2 and #3, but works everywhere.

    When an object file is compiled with PIC, #1 is prefered since it is
    faster than #3 and doesn't require relocation of _dl_sysinfo.  For
    dynamic executables, initializes TLS.  However, for static
    executables, before TLS is initialized by __libc_setup_tls, #3 should
    be used for syscalls.  This patch adds _startup_sbrk and _startup_fatal
    to be used in static executables before __libc_setup_tls is called.  By
    default, they are defined to __sbrk and __libc_fatal, respectively.  On
    Linux/i386, a special _startup_sbrk is provided and _startup_fatal is
    turned into ABORT_INSTRUCTION.

        [BZ #21913]
        * csu/libc-tls.c: Include <startup.h>.
        (__libc_setup_tls): Call _startup_sbrk instead of __sbrk.  Call
        _startup_fatal instead of __libc_fatal.
        * elf/dl-tunables.c: Include <startup.h>.
        (tunables_strdup): Call _startup_sbrk instead of __sbrk.
        * sysdeps/generic/startup.h: New file.
        * sysdeps/unix/sysv/linux/i386/startup.h: Likewise.
        * sysdeps/unix/sysv/linux/i386/startup_sbrk.c: Likewise.
        * sysdeps/unix/sysv/linux/i386/Makefile (sysdep_routine): Add
        startup_sbrk if default to PIE.
        (static-only-routines): Likewise.


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