Why -D_XOPEN_SOURCE=500 for Solaris?

[Craig Rodrigues]

Hi,

In PR 4915, the submitter asked why on _XOPEN_SOURCE 
on Solaris is defined to 500 with g++ but not
with gcc.  

I think this is due to the following:

/* For C++ we need to add some additional macro definitions required
   by the C++ standard library.  */
#define CPLUSPLUS_CPP_SPEC "\
-D_XOPEN_SOURCE=500 -D_LARGEFILE_SOURCE=1 -D_LARGEFILE64_SOURCE=1 \
-D__EXTENSIONS__ \
%(cpp) \

which was added here:

date: 2001/05/16 01:11:18;  author: mmitchel;  state: Exp;  lines: +22 -0
        * config/sparc/sol2.h (CPLUSPLUS_CPP_SPEC): Define.
 
        * porting.texi: Correct documentation about handling
        _LARRGEFILE_SOURCE and its ilk.
        * config/os/solaris/solaris2.5/bits/os_defines.h: Remove
        definitions of _XOPEN_SOURCE, _LARGEFILE64_SOURCE, and
        __EXTENSIONS__.
        * config/os/solaris/solaris2.6/bits/os_defines.h: Likewise.
        * config/os/solaris/solaris2.7/bits/os_defines.h: Likewise.



What is the reason for defining this?  Can I close PR 4915?

-- 
Craig Rodrigues        
http://www.gis.net/~craigr    
rodrigc@attbi.com