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On Thursday 18 July 2013 04:01:42 Yaakov (Cygwin/X) wrote: > On 2013-07-17 19:56, Sebastian Huber wrote: > > On 2013-07-18 06:15, Yaakov (Cygwin/X) wrote: > >> On 2013-07-17 15:34, Joel Sherrill wrote: > >>> While this was still fresh, I wanted to ask what was the > >>> proper conditional for methods marked as CX or XSI > >>> in the POSIX standard. > >> > >> This is what is done in glibc: > >> > >> http://man7.org/linux/man-pages/man7/feature_test_macros.7.html > >> > >> In short, <features.h> recognizes _*_SOURCE macros, which it uses to set > >> various __USE_* private macros which are used throughout the headers as > >> conditionals to control which APIs are made available. > >> > >> Having this done *properly* in the Newlib/Cygwin headers would be a > >> big step to > >> fixing a lot of compiling incompatibilities with glibc. It is also a > >> very > >> tedious task, although it may not have to be done all at once > > > > Unfortunately the GNU and BSD people don't talk much with each other. > > In FreeBSD we have this _*_SOURCE evaluation in <sys/cdefs.h>. Since I > > updated Newlibs "newlib/libc/include/sys/cdefs.h" a couple of weeks ago > > we should consider to use the infrastructure already available (see line > > 535 and below). Due to license issues it is more likely that Newlib > > will use code from BSD sources. > > AFAIK it doesn't really matter which header provides this functionality, > as long as all affected headers include that one. correct. all POSIX says is that you have to define things before you go including headers. the C library takes care of including the right file as needed (whether it be features.h or sys/cdefs.h or some other random file). -mike
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