From a6ba5d9f69f2a2e32919418c01b235149e3102f0 Mon Sep 17 00:00:00 2001
From: Paul Brossier <piem@piem.org>
Date: Sun, 25 Dec 2016 01:24:41 +0100
Subject: [PATCH] wscript: prepend defaults to honor user cflags

---
 wscript | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/wscript b/wscript
index d8afc03b..86517d60 100644
--- a/wscript
+++ b/wscript
@@ -137,11 +137,14 @@ def configure(ctx):
         ctx.define('NDEBUG', 1)
 
     if ctx.env.CC_NAME != 'msvc':
-        # enable debug symbols and configure warnings
-        ctx.env.CFLAGS += ['-g', '-Wall', '-Wextra']
         if ctx.options.build_type == "debug":
             # no optimization in debug mode
-            ctx.env.CFLAGS += ['-O0']
+            ctx.env.prepend_value('CFLAGS', ['-O0'])
+        else:
+            # default to -O2 in release mode
+            ctx.env.prepend_value('CFLAGS', ['-O2'])
+        # enable debug symbols and configure warnings
+        ctx.env.prepend_value('CFLAGS', ['-g', '-Wall', '-Wextra'])
     else:
         # enable debug symbols
         ctx.env.CFLAGS += ['/Z7', '/FS']
-- 
2.11.0