From 9143fda114c0f57bc57ca30378874f100cb1af73 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.cz>
Date: Wed, 4 Feb 2015 19:23:38 +0100
Subject: btrfs-progs: autoconf: set CFLAGS conditionally

The expected way to define custom CFLAGS is

  $ export CFLAGS=...
  $ ./configure ...

the build will use them. No not override the make variables directly
from now on.

Signed-off-by: David Sterba <dsterba@suse.cz>
---
 configure.ac | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index cbad0992..37bb18c0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,7 +8,8 @@ LIBBTRFS_MAJOR=0
 LIBBTRFS_MINOR=1
 LIBBTRFS_PATCHLEVEL=1
 
-CFLAGS="-g -O1"
+CFLAGS=${CFLAGS:-"-g -O1"}
+AC_SUBST([CFLAGS])
 
 AC_PREREQ([2.60])
 
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