Define _POSIX_VERSION correctly when older POSIX versions are selected.

diff --git a/ChangeLog b/ChangeLog
index fde9f03..280afff 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2009-08-23  Ulrich Drepper  <drepper@redhat.com>
 
+       * posix/unistd.h: Define _POSIX_VERSION correctly if older POSIX
+       versions are selected.
+
        * stdio-common/printf_fp.c: ISO C expects to print the sign of NaN
        as well.
        * stdio-common/printf_fphex.c: Likewise.

diff --git a/posix/unistd.h b/posix/unistd.h
index cbab9f9..2de9a68 100644 (file)
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -30,8 +30,22 @@ __BEGIN_DECLS
 /* These may be used to determine what facilities are present at compile time.
    Their values can be obtained at run time from `sysconf'.  */
 
+#ifdef __USE_XOPEN2K8
 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 2008.  */
-#define        _POSIX_VERSION  200809L
+# define _POSIX_VERSION        200809L
+#elif defined __USE_XOPEN2K
+/* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001.  */
+# define _POSIX_VERSION        200112L
+#elif defined __USE_POSIX199506
+/* POSIX Standard approved as ISO/IEC 9945-1 as of June 1995.  */
+# define _POSIX_VERSION        199506L
+#elif defined __USE_POSIX199309
+/* POSIX Standard approved as ISO/IEC 9945-1 as of September 1993.  */
+# define _POSIX_VERSION        199309L
+#else
+/* POSIX Standard approved as ISO/IEC 9945-1 as of September 1990.  */
+# define _POSIX_VERSION        199009L
+#endif
 
 /* These are not #ifdef __USE_POSIX2 because they are
    in the theoretically application-owned namespace.  */