id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
12804,Can't compiler IPC atomic_cas32<> on AIX.ppc with GCC,dima.ru.com@…,Ion Gaztañaga,"Hello,

I'm trying to use boost::atomic<> on AIX.ppc (v7.1) box and compile code with GCC. But unfortunately, the code below fails to compile :



----

{{{
inline boost::uint32_t atomic_cas32
   (volatile boost::uint32_t *mem, boost::uint32_t with, boost::uint32_t cmp)
{
   boost::uint32_t prev;

   asm volatile (""1:\n\t""                          
                 ""lwarx  %0,0,%1\n\t""
                 ""cmpw   %0,%3\n\t""
                 ""bne-   2f\n\t""                        
                 ""stwcx. %2,0,%1\n\t""
                 ""bne-   1b\n\t""                       
                 ""2:""                          
                 : ""=&r""(prev)
                 : ""b"" (mem), ""r"" (with), ""r"" (cmp)
                 : ""cc"", ""memory"");
   return prev;
}

}}}

AIX assembler (/usr/bin/as) execution fails with error saying that ""labels need to follow the symbol rules"". 
Simple change from ""1:\n\t"" to ""t_1:\n\t"" fixes the issue.

I have a question :
'''Is boost::atomic<> is designed to be compiled with GCC on AIX.ppc ? Or should it be used only with native xlC compiler ?'''



----

Environment :

{{{
-bash-4.3$ as -v
as V7.1

-bash-4.3$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/opt/freeware/libexec/gcc/powerpc-ibm-aix7.1.0.0/4.8.5/lto-wrapper
Target: powerpc-ibm-aix7.1.0.0
Configured with: ../gcc-4.8.5/configure --prefix=/opt/freeware --mandir=/opt/freeware/man --infodir=/opt/freeware/info --with-local-prefix=/opt/freeware --with-as=/usr/bin/as --with-ld=/usr/bin/ld --enable-languages=c,c++,fortran --enable-version-specific-runtime-libs --disable-nls --enable-decimal-float=dpd --with-cloog=no --with-ppl=no --disable-libstdcxx-pch --enable-__cxa_atexit
Thread model: aix
gcc version 4.8.5 (GCC)
-bash-4.3$

}}}
",Bugs,new,To Be Determined,interprocess,Boost 1.62.0,Problem,,,