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authorLasse Collin <lasse.collin@tukaani.org>2023-03-21 14:07:51 +0200
committerLasse Collin <lasse.collin@tukaani.org>2023-03-21 14:14:35 +0200
commit0c053f97337fa4ead77acefb577e8e86f8ef388d (patch)
treef2943902dc5c5ca8bf935135f85120a9c36fecd6
parentBuild: configure.ac: Use AS_IF and AS_CASE where required. (diff)
downloadxz-0c053f97337fa4ead77acefb577e8e86f8ef388d.tar.xz
Build: Add a comment that AC_PROG_CC_C99 is needed for Autoconf 2.69.
It's obsolete in Autoconf >= 2.70 and just an alias for AC_PROG_CC but Autoconf 2.69 requires AC_PROG_CC_C99 to get a C99 compiler.
-rw-r--r--configure.ac3
1 files changed, 3 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index a1f76c4d..9ab921e1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -602,6 +602,9 @@ echo "Initializing Automake:"
AM_INIT_AUTOMAKE([1.12 foreign tar-v7 filename-length-max=99 -Wno-unsupported])
AC_PROG_LN_S
+dnl # Autoconf >= 2.70 warns that AC_PROG_CC_C99 is obsolete. However,
+dnl # we have to keep using AC_PROG_CC_C99 instead of AC_PROG_CC
+dnl # as long as we try to be compatible with Autoconf 2.69.
AC_PROG_CC_C99
if test x$ac_cv_prog_cc_c99 = xno ; then
AC_MSG_ERROR([No C99 compiler was found.])