Allow to set optimization level during configure.

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

@@ -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']

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"]

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:')

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 to OPTIMIZATION (-On compiler flag). Default is 2 (-O2).")
     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)