Description: Modify compile flags handling in Makefile for Debian packaging
 This is to allow CFLAGS set by dpkg-buildflags from the environment
 so that hardening flags and DEB_BUILD_OPTIONS=noopt would work.
 .
 Also disable -march=native which causes FTBFS on many platforms
 and is inappropriate for a Debian package.  See a similar bug
 https://bugs.debian.org/761912 for an explanation.
 (Note: Upstream commented out "CFLAGS += -march=native" in commit
 0ead90d5d9ab861acd40a05490ed8e7936ac1fa5 on 2019-11-12.)
Author: Anthony Fok <foka@debian.org>
Origin: vendor
Bug-Debian: https://bugs.debian.org/801108
Forwarded: not-needed
Last-Update: 2016-12-30, 2020-02-12, 2020-11-05
---
This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
--- a/Makefile
+++ b/Makefile
@@ -32,6 +32,7 @@
 FLEX ?= flex
 A2X ?= a2x
 
+ENV_CFLAGS := $(CFLAGS)
 GCC_WARNINGS1=-Wall -Wpointer-arith -Wstrict-prototypes
 GCC_WARNINGS2=-Wmissing-prototypes -Wmissing-declarations
 GCC_WARNINGS3=-Wno-unused-function -Wno-unused-label -Wno-format-zero-length
@@ -86,7 +87,7 @@
 CFLAGS += -g
 # Test coverage flags
 # CFLAGS += -ftest-coverage -fprofile-arcs
-CFLAGS += $(EXTRA_CFLAGS)
+CFLAGS += $(EXTRA_CFLAGS) $(ENV_CFLAGS)
 
 #YFLAGS= --report=all
 LFLAGS=