From daabdf2e31cde2f8f91bb5e10452f05eb08bbdbc Mon Sep 17 00:00:00 2001
From: Philippe Teuwen <phil@teuwen.org>
Date: Mon, 19 Oct 2020 21:21:24 +0200
Subject: [PATCH] Avoid spurious GCC10 stringop-overflow errors I already got
 them at several occasions

---
 Makefile.defs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Makefile.defs b/Makefile.defs
index 06eb2e36f..4045fb711 100644
--- a/Makefile.defs
+++ b/Makefile.defs
@@ -27,6 +27,9 @@ LD = g++
 SH = sh
 BASH = bash
 PERL = perl
+CCC =foo
+CC_VERSION = $(shell $(CC) -dumpversion 2>/dev/null|sed 's/\..*//')
+CC_VERSION := $(or $(strip $(CC_VERSION)),0)
 
 PATHSEP=/
 PREFIX ?=              /usr/local
@@ -62,7 +65,11 @@ DEFCFLAGS += -Wbad-function-cast -Wredundant-decls -Wmissing-prototypes -Wchar-s
 # Some more warnings we need first to eliminate, so temporarely tolerated:
 DEFCFLAGS += -Wcast-align -Wno-error=cast-align
 DEFCFLAGS += -Wswitch-enum -Wno-error=switch-enum
-
+# GCC 10 has issues with false positives on stringop-overflow, let's disable them for now (cf https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92955, https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94335)
+# beware these flags didn't exist for GCC < 7
+ifeq ($(shell expr $(CC_VERSION) \>= 10), 1)
+    DEFCFLAGS += -Wno-stringop-overflow -Wno-error=stringop-overflow
+endif
 ifeq ($(platform),Darwin)
 # their readline has strict-prototype issues
 DEFCFLAGS += -Wno-strict-prototypes