149 lines
4.1 KiB
Python
149 lines
4.1 KiB
Python
# SConstruct
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# vim: set ft=python:
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#
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# Toplevel Scons build script. This should be mostly complete and generic enough
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# for most builds.
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#
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# Eryn Wells <eryn@erynwells.me>
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#
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# DEFAULT CONFIGURATION VALUES
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#
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# Settings for the default toolchain binaries. Setting these overrides the
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# defaults, provided your the given binary exists.
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CC = None
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CXX = None
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AS = None
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LINK = None
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# Same as above but for default CFLAGS. These are appended to both CFLAGS and
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# CXXFLAGS.
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CFLAGS = '-Wall -Wextra -pedantic'
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# Enabling debugging does the following things:
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# 1. Turns on debugging symbols
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# 2. Turns off all optimization
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# 3. Sets the DEBUG define
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DEBUG = True
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# Show build commands ("cc [args] -o [out] [file]", etc). If this is False, show
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# some nice messages for each step of the build.
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BUILD_CMDS = False
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#
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# BUILD STUFF BELOW HERE
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#
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import os
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import os.path
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import SCons.Errors
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def which(program):
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def is_executable(path):
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return os.path.exists(path) and os.access(path, os.X_OK)
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path, name = os.path.split(program)
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if path:
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if is_executable(program):
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return program
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else:
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pathext = [''] + os.environ.get('PATHEXT', '').split(os.pathsep)
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for path in os.environ.get('PATH', '').split(os.pathsep):
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exe = os.path.join(path, program)
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for ext in pathext:
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candidate = exe + ext
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if is_executable(candidate):
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return candidate
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return None
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def get_bool_argument(arg):
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try:
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return bool(int(arg))
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except ValueError:
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pass
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if arg in ('False', 'FALSE', 'false', ''):
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return False
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return True
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def set_toolchain_binary(env, var, user_binary, binaries=()):
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if user_binary and which(user_binary):
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env[var] = user_binary
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return
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for c in binaries:
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if which(c):
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env[var] = c
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break
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common_env = Environment()
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set_toolchain_binary(common_env, 'CC', CC, ('clang', 'gcc'))
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set_toolchain_binary(common_env, 'CXX', CXX, ('clang++', 'g++'))
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set_toolchain_binary(common_env, 'AS', AS)
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set_toolchain_binary(common_env, 'LINK', LINK)
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common_env.Append(CFLAGS='{} -std=c99'.format(CFLAGS))
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common_env.Append(CXXFLAGS='{} -std=c++11'.format(CFLAGS))
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BUILD_CMDS = get_bool_argument(ARGUMENTS.get('BUILD_CMDS', BUILD_CMDS))
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if not BUILD_CMDS:
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def generate_comstr(action):
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return '{:>25}: $TARGET'.format(action)
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common_env['ASCOMSTR'] = generate_comstr('Assembling')
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common_env['CCCOMSTR'] = generate_comstr('Building (C)')
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common_env['SHCCCOMSTR'] = generate_comstr('Building (C, Shared)')
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common_env['CXXCOMSTR'] = generate_comstr('Building (C++)')
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common_env['SHCXXCOMSTR'] = generate_comstr('Building (C++, Shared)')
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common_env['LINKCOMSTR'] = generate_comstr('Linking')
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common_env['SHLINKCOMSTR'] = generate_comstr('Linking (Shared)')
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common_env['ARCOMSTR'] = generate_comstr('Archiving')
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common_env['RANLIBCOMSTR'] = generate_comstr('Indexing')
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src_dir = Dir('#src')
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def create_env(variant_dir, appends=None):
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env = common_env.Clone()
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env.VariantDir(variant_dir, src_dir, duplicate=0)
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env.Clean('.', variant_dir)
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for k, v in appends.iteritems():
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if k.startswith('='):
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env[k[1:]] = v
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else:
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env.Append(**{k: v})
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return env
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debug_cflags = ' -O0 -g'
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debug_env = create_env(os.path.join('build', 'debug'), {
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'CPPDEFINES': ['DEBUG'],
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'CFLAGS': debug_cflags,
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'CXXFLAGS': debug_cflags,
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})
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release_cflags = ' -O2'
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release_env = create_env(os.path.join('build', 'release'), {
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'CPPDEFINES': ['RELEASE'],
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'CFLAGS': release_cflags,
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'CXXFLAGS': release_cflags,
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})
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modes = {
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'debug': debug_env,
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'release': release_env,
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}
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mode = ARGUMENTS.get('MODE', None)
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if mode:
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# If MODE=foo is specified, build only that mode.
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try:
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env = modes[mode]
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except KeyError:
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raise SCons.Errors.UserError('Invalid mode: {}'.format(mode))
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env.SConscript(os.path.join('build', mode, 'SConscript'), {'env': env})
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else:
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# Build all modes.
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for mode, env in modes.iteritems():
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env.SConscript(os.path.join('build', mode, 'SConscript'), {'env': env})
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