Add site_scons binaries and site_init files

site_scons/site_init.py

@@ -0,0 +1,51 @@
+# site_init.py
+#
+# This file is read before every SConstruct and SConscript. So, anything that
+# should be available to every build script should go here.
+#
+# Eryn Wells <eryn@erynwells.me>
+
+import os.path
+import SCons.Defaults
+import binaries
+
+
+BUILD_DIR = Dir('#build')
+LIB_DIR = Dir('#lib')
+SRC_DIR = Dir('#src')
+TEST_DIR = Dir('#test')
+
+#
+# SCons Command Line Options
+#
+
+AddOption('--show-build-cmds',
+          dest='build_cmds',
+          action='store_true',
+          help='Show build commands instead of friendly build messages')
+AddOption('--mode',
+          dest='mode',
+          metavar='MODE',
+          help='The build mode')
+
+#
+# Environment Configuration
+#
+
+def has_clang(env):
+    _, cc_tail = os.path.split(env['CC'])
+    _, cxx_tail = os.path.split(env['CXX'])
+    return any([cc_tail.startswith('clang'), cxx_tail.startswith('clang')])
+
+default_env = SCons.Defaults.DefaultEnvironment()
+default_env['CC'] = binaries.first(['clang', 'gcc'])
+default_env['CXX'] = binaries.first(['clang++', 'g++'])
+
+default_env.Append(CCFLAGS=['-Wall', '-Wextra', '-pedantic'])
+if has_clang(default_env):
+    # Only clang supports color.
+    default_env.Append(CCFLAGS=['-fcolor-diagnostics'])
+default_env.Append(CFLAGS=['-std=c99'])
+default_env.Append(CXXFLAGS=['-std=c++11'])
+
+