From: Michael Forney <mforney@mforney.org>
Date: Thu, 3 Oct 2013 09:36:05 +0000 (-0700)
Subject: build-sys: Use _POSIX_VERSION to determine support for %m
X-Git-Tag: v2.24-rc2~63
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=695e4e1a9862a5d2bc28dd31aa4cfafd4fd0caa4;p=thirdparty%2Futil-linux.git

build-sys: Use _POSIX_VERSION to determine support for %m

%m is included in POSIX 2008, so we can check if the libc implements
that before failing.

Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/configure.ac b/configure.ac
index cbcda46c84..95ff8b3d26 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
      ])],