g++ 4.8 fails with -Ox option

Patrick Begou Patrick.Begou@legi.grenoble-inp.fr
Fri Jul 19 17:39:00 GMT 2013


Hi,

I get a strange problem with g++ 4.8. My server has gcc44-c++-4.4.1 installed.
I've installed gcc4.8 in my home from gcc-4.8-20130711.tar.gz 
gcc-4.8-infrastructure.tar.gz.
PATH, LD_LIBRARY_PATH are setup to reach first this 4.8 install.

Initially I get the error runing the configure script to build OpenMPI, so I 
extract the small peace of test code in "prog.C" file for testing and:

g++ -o conftest -DNDEBUG -finline-functions prog.C
Is working but:
g++ -o conftest -O3 -DNDEBUG -finline-functions prog.C
says:

In file included from /usr/include/stdio.h:909:0,
from prog.C:141:
/usr/include/bits/stdio.h: In function ‘__ssize_t getline(char**, size_t*, FILE*)’:
/usr/include/bits/stdio.h:118:52: error: ‘__getdelim’ was not declared in this scope
return __getdelim (__lineptr, __n, '\n', __stream);

Same behavior with -O2 or -O1.
g++ 4.8 works with -O0.

I've no idea about this problem. Thanks for your advices.

Patrick

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