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From ca4b7338836edb7325c82f86dccdeb4808cb4a89 Mon Sep 17 00:00:00 2001
From: Mark Pizzolato <mark@infocomm.com>
Date: Wed, 29 Jan 2020 11:39:36 -0800
Subject: [PATCH] makefile: Force gcc/clang -fcommon to address future gcc
-fno-common default
as reported and discussed in #794
---
makefile | 7 +++++++
1 file changed, 7 insertions(+)
--- a/makefile
+++ b/makefile
@@ -506,9 +506,13 @@ else
ifneq (3,$(GCC_MAJOR_VERSION))
ifeq (,$(GCC_OPTIMIZERS_CMD))
GCC_OPTIMIZERS_CMD = $(GCC) --help=optimizers
+ GCC_COMMON_CMD = $(GCC) --help=common
endif
GCC_OPTIMIZERS = $(shell $(GCC_OPTIMIZERS_CMD))
endif
+ ifneq (,$(GCC_COMMON_CMD))
+ GCC_OPTIMIZERS += $(shell $(GCC_COMMON_CMD))
+ endif
ifneq (,$(findstring $(GCC_VERSION),$(LTO_EXCLUDE_VERSIONS)))
NO_LTO = 1
endif
@@ -530,6 +534,9 @@ else
ifneq (,$(findstring -fstrict-overflow,$(GCC_OPTIMIZERS)))
CFLAGS_O += -fno-strict-overflow
endif
+ ifneq (,$(findstring -fcommon,$(GCC_OPTIMIZERS))$(findstring -fno-common,$(GCC_OPTIMIZERS)))
+ CFLAGS_O += -fcommon
+ endif
ifeq (,$(NO_LTO))
ifneq (,$(findstring -flto,$(GCC_OPTIMIZERS)))
CFLAGS_O += -flto -fwhole-program
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