From: Johannes Berg <johannes.berg@intel.com>
Date: Mon, 4 Feb 2019 13:32:36 +0000 (+0100)
Subject: iw: make it build with older compilers again
X-Git-Tag: v5.0.1~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6439859e0efe4e10c2af814c0b527ee92b34474b;p=thirdparty%2Fiw.git

iw: make it build with older compilers again

There's no reason to require a newer compiler that understands
-Wstringop-overflow=4, make that optional.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---

diff --git a/Makefile b/Makefile
index 46d3030..33aaf6a 100644
--- a/Makefile
+++ b/Makefile
@@ -9,10 +9,14 @@ MKDIR ?= mkdir -p
 INSTALL ?= install
 CC ?= "gcc"
 
+cc-option = $(shell set -e ; $(CC) $(1) -c -x c /dev/null -o /dev/null >/dev/null 2>&1 && echo '$(1)')
+
+CFLAGS_EVAL := $(call cc-option,-Wstringop-overflow=4)
+
 CFLAGS ?= -O2 -g
 CFLAGS += -Wall -Wextra -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common \
 	  -Werror-implicit-function-declaration -Wsign-compare -Wno-unused-parameter \
-	  -Wstringop-overflow=4
+	  $(CFLAGS_EVAL)
 
 OBJS = iw.o genl.o event.o info.o phy.o \
 	interface.o ibss.o station.o survey.o util.o ocb.o \