On 20 January 2011 19:57, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > On 20 January 2011 19:28, Nick Stokes wrote: >> >> Great! This indeed revealed it. In /usr/include/locale.h (same >> location, line 133, in both distros actually) there is #ifdef >> __USE_GNU on CentOS version, which is #ifdef __USE_XOPEN2K8 in >> SUSE's version. So, in fact if I define `__USE_XOPEN2K8' while >> compiling on SUSE, it works. Hmm, go figure.. This can not be the >> right way to do this. What am I missing? > > I don't know why they're different (on my glibc 2.12 system the > uselocale definition is guarded by __USE_GNU, just like your CentOS > system) but it looks like you've found the solution. > > Users are not supposed to use the __USE_XXX macros, instead you should > define _GNU_SOURCE to enable __USE_GNU and _POSIX_C_SOURCE=200809L (or > greater) to enable __USE_XOPEN2K8. It looks as though you can also define _XOPEN_SOURCE=700 (or greater) to set __USE_XOPEN2K8 Either way, you should use one of those standard feature test macros, not the __USE_XOPEN2K8 one which is an internal implementation details, see man feature_test_macros for more details.
