From e33648484775fa533fc8f1e5cc45f60061d29d54 Mon Sep 17 00:00:00 2001
From: INADA Naoki <methane@users.noreply.github.com>
Date: Tue, 5 Jun 2018 20:40:53 +0900
Subject: bpo-5755: Move -Wstrict-prototypes to CFLAGS_NODIST (GH-7395)

---
 configure.ac | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 189273daca..67cf817456 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1421,9 +1421,6 @@ if test "${OPT-unset}" = "unset"
 then
     case $GCC in
     yes)
-        if test "$CC" != 'g++' ; then
-	    STRICT_PROTO="-Wstrict-prototypes"
-	fi
         # For gcc 4.x we need to use -fwrapv so lets check if its supported
         if "$CC" -v --help 2>/dev/null |grep -- -fwrapv > /dev/null; then
            WRAP="-fwrapv"
@@ -1470,8 +1467,6 @@ then
 	    ;;
 	esac
 
-	OPT="$OPT $STRICT_PROTO"
-
 	case $ac_sys_system in
 	    SCO_SV*) OPT="$OPT -m486 -DSCO5"
 	    ;;
@@ -1678,6 +1673,26 @@ yes)
     fi
     AC_MSG_RESULT($ac_cv_enable_unreachable_code_warning)
 
+    AC_MSG_CHECKING(if we can turn on $CC strict-prototypes warning)
+     ac_save_cc="$CC"
+     CC="$CC -Werror -Wstrict-prototypes"
+     AC_CACHE_VAL(ac_cv_enable_enable_strict_prototypes_warning,
+       AC_COMPILE_IFELSE(
+         [
+       AC_LANG_PROGRAM([[]], [[]])
+     ],[
+       ac_cv_enable_strict_prototypes_warning=yes
+     ],[
+       ac_cv_enable_strict_prototypes_warning=no
+     ]))
+     CC="$ac_save_cc"
+    AC_MSG_RESULT($ac_cv_enable_strict_prototypes_warning)
+
+    if test $ac_cv_enable_strict_prototypes_warning = yes
+    then
+      CFLAGS_NODIST="$CFLAGS_NODIST -Wstrict-prototypes"
+    fi
+
     AC_MSG_CHECKING(if we can make implicit function declaration an error in $CC)
      ac_save_cc="$CC"
      CC="$CC -Werror=implicit-function-declaration"
-- 
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