From 8187a60ac362a1efc4ce3244ef845ccb1fb2e18c Mon Sep 17 00:00:00 2001
From: Paul Floyd <pjfloyd@wanadoo.fr>
Date: Tue, 19 Apr 2022 22:21:37 +0200
Subject: [PATCH] Add a configure test for -ansi and use it for none/tests/ansi

---
 configure.ac           | 18 ++++++++++++++++++
 none/tests/Makefile.am |  4 ++--
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index c627a9c17a..eda617fc58 100755
--- a/configure.ac
+++ b/configure.ac
@@ -2900,6 +2900,24 @@ AC_MSG_RESULT([no])
 ])
 CFLAGS=$safe_CFLAGS
 
+AC_MSG_CHECKING([if gcc accepts -ansi])
+
+safe_CFLAGS=$CFLAGS
+CFLAGS="-ansi"
+
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
+   return 0;
+]])], [
+ac_have_ansi=yes
+AC_MSG_RESULT([yes])
+], [
+ac_have_ansi=no
+AC_MSG_RESULT([no])
+])
+AM_CONDITIONAL([HAVE_ANSI], [test x$ac_have_ansi = xyes])
+
+CFLAGS=$safe_CFLAGS
+
 
 # Does this compiler support -no-pie?
 # On Ubuntu 16.10+, gcc produces position independent executables (PIE) by
diff --git a/none/tests/Makefile.am b/none/tests/Makefile.am
index 2ac09e6202..727c2661bb 100644
--- a/none/tests/Makefile.am
+++ b/none/tests/Makefile.am
@@ -282,8 +282,8 @@ if ! VGCONF_OS_IS_DARWIN
    check_PROGRAMS += ppoll_alarm
 endif
 
-# clang does not know -ansi
-if ! COMPILER_IS_CLANG
+# older (?) clang does not know -ansi
+if HAVE_ANSI
    check_PROGRAMS += ansi
 endif
 
-- 
2.47.2