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References: <bug-35816-15855@http.gcc.gnu.org/bugzilla/>
Subject: [Bug libstdc++/35816] libstdc++ build during bootstrap is optimizing away atomic builtin check
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------- Comment #3 from bkoz at gcc dot gnu dot org  2008-04-14 22:48 -------

Wow. Confirmed. This does not happen at -O2 with gcc-4.1.2

However, on gcc-4.3.0 branch:

$bld/H-x86-gcc-4_3-branch.20080227/bin/g++ -O2 -S -march=i386 testatomic.cc

gives:

        .file   "testatomic.cc"
        .text
        .p2align 2,,3
.globl main
        .type   main, @function
main:
.LFB2:
        leal    4(%esp), %ecx
.LCFI0:
        andl    $-16, %esp
        pushl   -4(%ecx)
.LCFI1:
        pushl   %ebp
.LCFI2:
        movl    %esp, %ebp
.LCFI3:
        pushl   %ecx
.LCFI4:
        subl    $16, %esp
.LCFI5:
        leal    -8(%ebp), %edx
        xorl    %eax, %eax
        lock addl       %eax, (%edx)
        addl    $16, %esp
        popl    %ecx
        leave
        leal    -4(%ecx), %esp
        ret
.LFE2:
        .size   main, .-main
        .ident  "GCC: (GNU) 4.3.0 20080227 (prerelease)"
        .section        .note.GNU-stack,"",@progbits


Fix in progress.


-- 

bkoz at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |bkoz at gcc dot gnu dot org
                   |dot org                     |
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2008-04-14 22:48:43
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35816