From 8684bb70d3676dcd84ba14f0d990a1d8dc451c3b Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 7 Sep 2020 11:03:30 +0200
Subject: [PATCH] configure: let --enable-debug set -Wenum-conversion with gcc
 >= 10

Unfortunately, this option is not detecting the same issues as clang's
-Wassign-enum flag, but should still be useful to detect future
mistakes.

Closes #5930
---
 m4/curl-compilers.m4 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index 107dc6ab9..b0d5d4213 100644
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -1119,6 +1119,10 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
             fi
           fi
         fi
+        dnl Only gcc 10 or later
+        if test "$compiler_num" -ge "1000"; then
+          CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [enum-conversion])
+        fi
         ;;
         #
       HP_UX_C)