[PATCH] Allow to set optimization level during configure.

[Christian Mauderer]

From: Christian Mauderer <Christian.Mauderer at embedded-brains.de>

This allows to set the optimization level for libbsd via a configure
switch. Useful for building with for example no optimization during
debug or with size optimization for space restricted targets.
---
 builder.py       | 3 +--
 libbsd_waf.py    | 2 +-
 waf_generator.py | 1 +
 wscript          | 6 ++++++
 4 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/builder.py b/builder.py
index b62f79dc..ae2e6eee 100755
--- a/builder.py
+++ b/builder.py
@@ -156,8 +156,7 @@ class diffRecord:
 # This stuff needs to move to libbsd.py.
 #
 def commonFlags():
-    return ['-O2',
-            '-g',
+    return ['-g',
             '-fno-strict-aliasing',
             '-ffreestanding',
             '-fno-common']
diff --git a/libbsd_waf.py b/libbsd_waf.py
index a2f581f7..02e87038 100644
--- a/libbsd_waf.py
+++ b/libbsd_waf.py
@@ -34,7 +34,7 @@ def configure(conf):
 def build(bld):
     # C/C++ flags
     common_flags = []
-    common_flags += ["-O2"]
+    common_flags += ["-O" + bld.env.OPTIMIZATION]
     common_flags += ["-g"]
     common_flags += ["-fno-strict-aliasing"]
     common_flags += ["-ffreestanding"]
diff --git a/waf_generator.py b/waf_generator.py
index a482623a..3a315979 100755
--- a/waf_generator.py
+++ b/waf_generator.py
@@ -371,6 +371,7 @@ class ModuleManager(builder.ModuleManager):
         self.add('def build(bld):')
         self.add('    # C/C++ flags')
         self.add('    common_flags = []')
+        self.add('    common_flags += ["-O%s" % (bld.env.OPTIMIZATION)]')
         for f in builder.commonFlags():
             self.add('    common_flags += ["%s"]' % (f))
         self.add('    if bld.env.WARNINGS:')
diff --git a/wscript b/wscript
index 7088eab3..25a5f85c 100644
--- a/wscript
+++ b/wscript
@@ -68,6 +68,11 @@ def options(opt):
                    default = "",
                    dest = "freebsd_options",
                    help = "Set FreeBSD options (developer option).")
+    opt.add_option("--optimization",
+                   action = "store",
+                   default = "2",
+                   dest = "optimization",
+                   help = "Set optimization level (-On compiler flag). Default ist 2.")
     libbsd_waf.options(opt)
 
 def bsp_configure(conf, arch_bsp):
@@ -88,6 +93,7 @@ def configure(conf):
     conf.env.WARNINGS = conf.options.warnings
     conf.env.NET_CONFIG = conf.options.net_config
     conf.env.FREEBSD_OPTIONS =conf.options.freebsd_options
+    conf.env.OPTIMIZATION = conf.options.optimization
     rtems.configure(conf, bsp_configure)
     libbsd_waf.configure(conf)
 
-- 
2.12.3