[gfs2-utils] 01/01: configure: Only use AC_PROG_CC_C99 for autoconf < 2.70

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andyp pushed a commit to branch andyp-c99
in repository gfs2-utils.

commit 498a2103bb6f5b0ae039eefefc51ef5228d456ff
Author: Andrew Price <anprice(a)redhat.com&gt;
AuthorDate: Fri Oct 14 10:23:10 2022 +0100

    configure: Only use AC_PROG_CC_C99 for autoconf < 2.70
    
    configure.ac:56: warning: The macro `AC_PROG_CC_C99' is obsolete.
    
    The functionality was rolled into AC_PROG_CC in Autoconf 2.70 but we
    still need to use AC_PROG_CC_C99 in older distros, so invoke it via
    m4_version_prereq()
    
    Signed-off-by: Andrew Price <anprice(a)redhat.com&gt;
---
 configure.ac | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 031d1014..73a9e207 100644
--- a/configure.ac
+++ b/configure.ac
@@ -53,7 +53,8 @@ if ! ${MAKE-make} --version /cannot/make/this >/dev/null 2>&1;
then
 fi
 
 AC_PROG_CC
-AC_PROG_CC_C99
+# Autoconf 2.70 obsoletes AC_PROG_CC_C99 but we still care about older distros
+m4_version_prereq([2.70],[],[AC_PROG_CC_C99])
 if test "x$ac_cv_prog_cc_c99" = "xno"; then
 	AC_MSG_ERROR(["C99 support is required"])
 fi

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