http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56665
Bug #: 56665
Summary: -O2 with -fno-strict-aliasing makes
boost::spirit::classic::assign_a not working
Classification: Unclassified
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: bodzio...@op.pl
Hi,
I have problem using gcc4.7.2 with -fno-strict-aliasing switch along with -O2.
This combination makes boost::spirit::classic::assign_a (boost1.48) not working
properly. In undermentioned example value 101101 is not assigned to 'variable'.
It worked fine with gcc3.4.3, and it works ok with gcc4.7.2 -O2 without
-fno-strict-aliasing.
//-- start
#include
#include
#include
int main()
{
int variable = 123;
using namespace boost::spirit::classic;
using namespace phoenix;
rule<> testRule
// = eps_p [ var( variable ) = 101101 ] //that one works fine with -O2
-fno-strict-aliasing
= eps_p [ assign_a( variable, 101101 ) ] //this one gives rubbish with
-O2 -fno-strict-aliasing
;
parse_info<> result = parse( "bla bla", testRule );
if ( result.hit )
printf( "%d\n", variable );
return 0;
}
//-- end
gcc details:
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/home/build/storage/toolchain/gcc-4.7.2/bin/../libexec/gcc/i686-pc-linux-gnu/4.7.2/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.7.2/configure --prefix=/usr/local/gcc-4.7.2
--enable-languages=c,c++ --with-gmp=/usr/local/gcc-4.7.2
--with-ppl=/usr/local/gcc-4.7.2 --with-cloog=/usr/local/gcc-4.7.2
Thread model: posix
gcc version 4.7.2 (GCC)
Whole comilation log (g++ -v -save-temps -O2 -fno-strict-aliasing -pthread
-I/usr/local/gcc-4.7.2/STLport-5.2.1/boost-1.48/include
-L/usr/local/gcc-4.7.2/STLport-5.2.1/lib main.cpp -o test):
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/home/build/storage/toolchain/gcc-4.7.2/bin/../libexec/gcc/i686-pc-linux-gnu/4.7.2/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.7.2/configure --prefix=/usr/local/gcc-4.7.2
--enable-languages=c,c++ --with-gmp=/usr/local/gcc-4.7.2
--with-ppl=/usr/local/gcc-4.7.2 --with-cloog=/usr/local/gcc-4.7.2
Thread model: posix
gcc version 4.7.2 (GCC)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O2' '-fno-strict-aliasing' '-pthread'
'-I' '/usr/local/gcc-4.7.2/STLport-5.2.1/boost-1.48/include'
'-L/usr/local/gcc-4.7.2/STLport-5.2.1/lib' '-o' 'test' '-shared-libgcc'
'-mtune=generic' '-march=pentiumpro'
/home/build/storage/toolchain/gcc-4.7.2/bin/../libexec/gcc/i686-pc-linux-gnu/4.7.2/cc1plus
-E -quiet -v -I /usr/local/gcc-4.7.2/STLport-5.2.1/boost-1.48/include -iprefix
/home/build/storage/toolchain/gcc-4.7.2/bin/../lib/gcc/i686-pc-linux-gnu/4.7.2/
-D_GNU_SOURCE -D_REENTRANT main.cpp -mtune=generic -march=pentiumpro
-fno-strict-aliasing -O2 -fpch-preprocess -o main.ii
ignoring nonexistent directory
"/home/build/storage/toolchain/gcc-4.7.2/bin/../lib/gcc/i686-pc-linux-gnu/4.7.2/../../../../i686-pc-linux-gnu/include"
ignoring duplicate directory
"/home/build/storage/toolchain/gcc-4.7.2/bin/../lib/gcc/../../lib/gcc/i686-pc-linux-gnu/4.7.2/../../../../include/c++/4.7.2"
ignoring duplicate directory
"/home/build/storage/toolchain/gcc-4.7.2/bin/../lib/gcc/../../lib/gcc/i686-pc-linux-gnu/4.7.2/../../../../include/c++/4.7.2/i686-pc-linux-gnu"
ignoring duplicate directory
"/home/build/storage/toolchain/gcc-4.7.2/bin/../lib/gcc/../../lib/gcc/i686-pc-linux-gnu/4.7.2/../../../../include/c++/4.7.2/backward"
ignoring duplicate directory
"/home/build/storage/toolchain/gcc-4.7.2/bin/../lib/gcc/../../lib/gcc/i686-pc-linux-gnu/4.7.2/include"
ignoring duplicate directory
"/home/build/storage/toolchain/gcc-4.7.2/bin/../lib/gcc/../../lib/gcc/i686-pc-linux-gnu/4.7.2/include-fixed"
ignoring nonexistent directory
"/home/build/storage/toolchain/gcc-4.7.2/bin/../lib/gcc/../../lib/gcc/i686-pc-linux-gnu/4.7.2/../../../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/gcc-4.7.2/STLport-5.2.1/boost-1.48/include
/home/build/storage/toolchain/gcc-4.7.2/bin/../lib/gcc/i686-pc-linux-gnu/4.7.2/../../../../include/c++/4.7.2
/home/build/storage/toolchain/gcc-4.7.2/bin/../lib/gcc/i686-pc-linux-gnu/4.7.2/../../../../include/c++/4.7.2/i686-pc-linux-gnu
/home/build/storage/toolchain/gcc-4.7.2/bin/../lib/gcc/i686-pc-linux-gnu/4.7.2/../../../../include/c++/4.7.2/backward
/home/build/storage/toolchain/gcc-4.7.2/bin/../lib/gcc/i686-pc-linux-gnu/4.7.2/include
/home/build/storage/toolchain/gcc-4.7.2/bin/../lib/gcc/i686-pc-linux-gnu/4.7.2/include-fixed
/usr/local/include
/home/build/storage/toolchain/gcc-4.7.2/bin/../lib/gcc/../../include
/usr/include
End of search
