[Webkit-unassigned] [Bug 155371] New: build fails with memory model cannot be stronger than success memory model for ‘__atomic_compare_exchange’

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=155371

            Bug ID: 155371
           Summary: build fails with memory model cannot be stronger than
                    success memory model for ‘__atomic_compare_exchange’
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: buchner.johannes at gmx.at
                CC: bugs-noreply at webkitgtk.org

When compiling webkit-gtk with the -Os flag, gcc fails with:

FAILED: /usr/bin/x86_64-pc-linux-gnu-g++  -DBUILDING_GTK__=1 -DBUILDING_WITH_CMAKE=1 -DBUILDING_WTF -DDATA_DIR=\"share\" -DGETTEXT_PACKAGE=\"WebKit2GTK-4.0\" -DHAVE_CONFIG_H=1 -DUSER_AGENT_GTK_MAJOR_VERSION=602 -DUSER_AGENT_GTK_MINOR_VERSION=1 -DWEBKITGTK_API_VERSION_STRING=\"4.0\"   -DENABLE_JIT=0 -DENABLE_YARR_JIT=0 -DENABLE_ASSEMBLER=0 -DNDEBUG -march=native -O2 -pipe -fno-strict-aliasing  -std=c++11 -I/var/tmp/portage/net-libs/webkit-gtk-2.10.7/work/webkitgtk-2.10.7/Source/bmalloc -I/var/tmp/portage/net-libs/webkit-gtk-2.10.7/work/webkitgtk-2.10.7/Source/WTF -I/var/tmp/portage/net-libs/webkit-gtk-2.10.7/work/webkitgtk-2.10.7/Source/WTF/wtf -I/var/tmp/portage/net-libs/webkit-gtk-2.10.7/work/webkitgtk-2.10.7/Source/WTF/wtf/dtoa -I/var/tmp/portage/net-libs/webkit-gtk-2.10.7/work/webkitgtk-2.10.7/Source/WTF/wtf/text -I/var/tmp/portage/net-libs/webkit-gtk-2.10.7/work/webkitgtk-2.10.7/Source/WTF/wtf/threads -I/var/tmp/portage/net-libs/webkit-gtk-2.10.7/work/webkitgtk-2.10.7/Source/WTF/
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4/atomic:41:0,
                 from /var/tmp/portage/net-libs/webkit-gtk-2.10.7/work/webkitgtk-2.10.7/Source/WTF/wtf/Atomics.h:29,
                 from /var/tmp/portage/net-libs/webkit-gtk-2.10.7/work/webkitgtk-2.10.7/Source/WTF/wtf/ParkingLot.h:31,
                 from /var/tmp/portage/net-libs/webkit-gtk-2.10.7/work/webkitgtk-2.10.7/Source/WTF/wtf/ParkingLot.cpp:27:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4/bits/atomic_base.h: In member function ‘void WTF::WordLock::lock()’:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4/bits/atomic_base.h:538:70: error: failure memory model cannot be stronger than success memory model for ‘__atomic_compare_exchange’
  return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 1, __m1, __m2);
                                                                      ^
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4/bits/atomic_base.h: In member function ‘void WTF::WordLock::unlock()’:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4/bits/atomic_base.h:538:70: error: failure memory model cannot be stronger than success memory model for ‘__atomic_compare_exchange’
  return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 1, __m1, __m2);
                                                                      ^
ninja: build stopped: subcommand failed.

I can reproduce the bug for webkit-gtk-2.10.4-r1. 

The build with -Os succeeded for webkit-gtk-2.8.5.

This bug has been reported in Gentoo at https://bugs.gentoo.org/show_bug.cgi?id=575388

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