set stdio

if tst note{ _ALL_SOURCE & _POSIX_SOURCE & _POSIX_C_SOURCE & _XOPEN_SOURCE & __EXTENSIONS__ works }end compile{

#define _ALL_SOURCE 1

#define _POSIX_SOURCE 1

#define _POSIX_C_SOURCE 21000101L

#define _XOPEN_SOURCE 9900

#define _GNU_SOURCE 1

#define __EXTENSIONS__ 1

#include <sys/types.h>

#include <sys/stat.h>

#include <stdlib.h>

#include <unistd.h>

}end {

#ifndef _ALL_SOURCE

#define _ALL_SOURCE 1

#endif

#ifndef _POSIX_SOURCE

#define _POSIX_SOURCE 1

#endif

#ifndef _POSIX_C_SOURCE

#define _POSIX_C_SOURCE 21000101L

#endif

#ifndef _XOPEN_SOURCE

#define _XOPEN_SOURCE 9900

#endif

#ifndef _GNU_SOURCE

#define _GNU_SOURCE 1

#endif

#ifndef __EXTENSIONS__

#define __EXTENSIONS__ 1

#endif

}

elif tst note{ _ALL_SOURCE & _POSIX_SOURCE & _XOPEN_SOURCE & __EXTENSIONS__ works }end compile{

#define _ALL_SOURCE 1

#define _POSIX_SOURCE 1

#define _XOPEN_SOURCE 9900

#define _GNU_SOURCE 1

#define __EXTENSIONS__ 1

#include <sys/types.h>

#include <sys/stat.h>

#include <stdlib.h>

#include <unistd.h>

}end {

#ifndef _ALL_SOURCE

#define _ALL_SOURCE 1

#endif

#ifndef _POSIX_SOURCE

#define _POSIX_SOURCE 1

#endif

#ifndef _XOPEN_SOURCE

#define _XOPEN_SOURCE 9900

#endif

#ifndef _GNU_SOURCE

#define _GNU_SOURCE 1

#endif

#ifndef __EXTENSIONS__

#define __EXTENSIONS__ 1

#endif

}

elif tst note{ _POSIX_SOURCE & _POSIX_C_SOURCE & _XOPEN_SOURCE & __EXTENSIONS__ works }end compile{

#define _POSIX_SOURCE 1

#define _POSIX_C_SOURCE 21000101L

#define _XOPEN_SOURCE 9900

#define _GNU_SOURCE 1

#define __EXTENSIONS__ 1

#include <sys/types.h>

#include <sys/stat.h>

#include <stdlib.h>

#include <unistd.h>

}end {

#ifndef _POSIX_SOURCE

#define _POSIX_SOURCE 1

#endif

#ifndef _POSIX_C_SOURCE

#define _POSIX_C_SOURCE 21000101L

#endif

#ifndef _XOPEN_SOURCE

#define _XOPEN_SOURCE 9900

#endif

#ifndef _GNU_SOURCE

#define _GNU_SOURCE 1

#endif

#ifndef __EXTENSIONS__

#define __EXTENSIONS__ 1

#endif

}

elif tst note{ _POSIX_SOURCE & _XOPEN_SOURCE & __EXTENSIONS__ works }end compile{

#define _POSIX_SOURCE 1

#define _XOPEN_SOURCE 1

#define __EXTENSIONS__ 1

#include <sys/types.h>

#include <sys/stat.h>

#include <stdlib.h>

#include <unistd.h>

}end {

#ifndef _POSIX_SOURCE

#define _POSIX_SOURCE 1

#endif

#ifndef _XOPEN_SOURCE

#define _XOPEN_SOURCE 1

#endif

#ifndef __EXTENSIONS__

#define __EXTENSIONS__ 1

#endif

}

elif tst note{ _XOPEN_SOURCE & __EXTENSIONS__ works }end compile{

#define _XOPEN_SOURCE 1

#define __EXTENSIONS__ 1

#include <sys/types.h>

#include <sys/stat.h>

#include <stdlib.h>

#include <unistd.h>

}end {

#ifndef _XOPEN_SOURCE

#define _XOPEN_SOURCE 1

#endif

#ifndef __EXTENSIONS__

#define __EXTENSIONS__ 1

#endif

}

elif tst note{ _XOPEN_SOURCE works }end compile{

#define _XOPEN_SOURCE 1

#include <sys/types.h>

#include <sys/stat.h>

#include <stdlib.h>

#include <unistd.h>

}end {

#ifndef _XOPEN_SOURCE

#define _XOPEN_SOURCE 1

#endif

}

else tst note{ __EXTENSIONS__ works }end compile{

#define __EXTENSIONS__ 1

#include <sys/types.h>

#include <sys/stat.h>

}end {

#ifndef __EXTENSIONS__

#define __EXTENSIONS__ 1

#endif

}

endif

if tst -D_ISOC99_SOURCE -lm note{ _ISOC99_SOURCE plays nice }end link{

#include <sys/types.h>

#include <sys/stat.h>

#include <stdlib.h>

#include <unistd.h>

#include <math.h>

int main() { return signbit(-0.0); }

}end {

#ifndef _ISOC99_SOURCE

#define _ISOC99_SOURCE 1

#endif

}

endif

cat{

/*

* this is a nasty game we all play to honor standards symbol visibility

* it would help if all implementations had

* _KITCHEN_SINK_SOURCE

* that enabled all symbols from the latest implemented standards

* that's probably the most useful but least portable request

*/

#if __MACH__

#undef _POSIX_SOURCE

#endif

}end