Re: [Boost-users] regex __sync_fetch_and_add_4 issue when compiling to 32 bit Linux

Ákos Maróy wrote:

#if defined __i386___

You have three trailing underscores instead of two here. :-) Could you look at the list of the predefined macros and see what it contains? From memory, you need to do something like touch empty.cpp g++ -m32 -march=i386 -dM -E empty.cpp I've never seen g++ not define __i386__ with -march=i386. Very odd.