configure: don't call AC_PROG_CC_C99 on recent autoconf

It's deprecated since autoconf 2.70 and $ac_cv_prog_cc_c99 is set by AC_PROG_CC Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>
open-mpi · Jun 7, 2021 · c49b658 · c49b658
1 parent f6791b3
commit c49b658
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Showing 2 changed files with 5 additions and 3 deletions.
diff --git a/config/hwloc.m4 b/config/hwloc.m4
@@ -163,8 +163,9 @@ EOF])
           [AC_DEFINE([HWLOC_SYM_TRANSFORM], [1])])
 
     # hwloc 2.0+ requires a C99 compliant compiler
-    AC_PROG_CC_C99
-    # The result of AC_PROG_CC_C99 is stored in ac_cv_prog_cc_c99
+    # AC_PROG_CC_C99 obsolete, detected inside AC_PROG_CC, since autoconf 2.70
+    m4_version_prereq([2.70], [], [AC_PROG_CC_C99])
+    # The C99 result of AC_PROG_CC>=2.70 or AC_PROG_CC_C99 is stored in ac_cv_prog_cc_c99
     if test "x$ac_cv_prog_cc_c99" = xno ; then
         AC_MSG_WARN([hwloc requires a C99 compiler])
         AC_MSG_ERROR([Aborting.])

diff --git a/configure.ac b/configure.ac
@@ -97,7 +97,8 @@ LT_LANG([C++])
 CFLAGS_save=$CFLAGS
 AC_PROG_CC
 AM_PROG_CC_C_O
-AC_PROG_CC_C99
+# AC_PROG_CC_C99 obsolete, detected inside AC_PROG_CC, since autoconf 2.70
+m4_version_prereq([2.70], [], [AC_PROG_CC_C99])
 CFLAGS=$CFLAGS_save
 
 AC_ARG_VAR(CC_FOR_BUILD,[build system C compiler])