[PATCH 1/4] Use _POSIX_VERSION to determine support for %m

[Michael Forney <mforney@xxxxxxxxxxx>]

%m is included in POSIX 2008, so we can check if the libc implements
that before failing.
---
 configure.ac | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index cbcda46..95ff8b3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -430,6 +430,7 @@ AC_CACHE_VAL([scanf_cv_alloc_modifier],
 
     [AC_COMPILE_IFELSE([AC_LANG_SOURCE([
      #include <stdio.h>
+     #include <unistd.h>
 
      #ifdef __GLIBC__
 
@@ -437,8 +438,13 @@ AC_CACHE_VAL([scanf_cv_alloc_modifier],
      #error %m is not available
      #endif
 
-     #else
+     #elif defined(_POSIX_VERSION)
 
+     #if _POSIX_VERSION < 200809L
+     #error %m is not available
+     #endif
+
+     #else
      #error Your C-library is not supported.
      #endif
      ])],
-- 
1.8.4

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