Support specifying target and host platform in gen.py
This is a first step towards a support for cross-compiling GN to
other platforms other than the host.
Change-Id: I895d2951ce01f00541de59e206e55bfc4e49abb9
Reviewed-on: https://gn-review.googlesource.com/2661
Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Petr Hosek <phosek@google.com>
diff --git a/build/gen.py b/build/gen.py
index e333652..76f88e8 100755
--- a/build/gen.py
+++ b/build/gen.py
@@ -21,17 +21,68 @@
REPO_ROOT = os.path.dirname(SCRIPT_DIR)
GN_ROOT = os.path.join(REPO_ROOT, 'tools', 'gn')
-is_win = sys.platform.startswith('win')
-is_linux = sys.platform.startswith('linux')
-is_mac = sys.platform.startswith('darwin')
-is_aix = sys.platform.startswith('aix')
-is_posix = is_linux or is_mac or is_aix
+
+class Platform(object):
+ """Represents a host/target platform."""
+ def __init__(self, platform):
+ self._platform = platform
+ if self._platform is not None:
+ return
+ self._platform = sys.platform
+ if self._platform.startswith('linux'):
+ self._platform = 'linux'
+ elif self._platform.startswith('darwin'):
+ self._platform = 'darwin'
+ elif self._platform.startswith('mingw'):
+ self._platform = 'mingw'
+ elif self._platform.startswith('win'):
+ self._platform = 'msvc'
+ elif self._platform.startswith('aix'):
+ self._platform = 'aix'
+ elif self._platform.startswith('fuchsia'):
+ self._platform = 'fuchsia'
+
+ @staticmethod
+ def known_platforms():
+ return ['linux', 'darwin', 'msvc', 'aix', 'fuchsia']
+
+ def platform(self):
+ return self._platform
+
+ def is_linux(self):
+ return self._platform == 'linux'
+
+ def is_mingw(self):
+ return self._platform == 'mingw'
+
+ def is_msvc(self):
+ return self._platform == 'msvc'
+
+ def is_windows(self):
+ return self.is_mingw() or self.is_msvc()
+
+ def is_darwin(self):
+ return self._platform == 'darwin'
+
+ def is_aix(self):
+ return self._platform == 'aix'
+
+ def is_posix(self):
+ return self._platform in ['linux', 'darwin', 'aix']
def main(argv):
parser = optparse.OptionParser(description=sys.modules[__name__].__doc__)
parser.add_option('-d', '--debug', action='store_true',
help='Do a debug build. Defaults to release build.')
+ parser.add_option('--platform',
+ help='target platform (' +
+ '/'.join(Platform.known_platforms()) + ')',
+ choices=Platform.known_platforms())
+ parser.add_option('--host',
+ help='host platform (' +
+ '/'.join(Platform.known_platforms()) + ')',
+ choices=Platform.known_platforms())
parser.add_option('--use-lto', action='store_true',
help='Enable the use of LTO')
parser.add_option('--use-icf', action='store_true',
@@ -47,23 +98,31 @@
if args:
parser.error('Unrecognized command line arguments: %s.' % ', '.join(args))
+ platform = Platform(options.platform)
+ if options.host:
+ host = Platform(options.host)
+ else:
+ host = platform
+
linux_sysroot = None
- if is_linux and not options.no_sysroot:
+ if platform.is_linux() and not options.no_sysroot:
linux_sysroot = UpdateLinuxSysroot()
out_dir = options.out_path or os.path.join(REPO_ROOT, 'out')
if not os.path.isdir(out_dir):
os.makedirs(out_dir)
if not options.no_last_commit_position:
- GenerateLastCommitPosition(os.path.join(out_dir, 'last_commit_position.h'))
- WriteGNNinja(os.path.join(out_dir, 'build.ninja'), options, linux_sysroot)
+ GenerateLastCommitPosition(host,
+ os.path.join(out_dir, 'last_commit_position.h'))
+ WriteGNNinja(os.path.join(out_dir, 'build.ninja'), platform, host, options,
+ linux_sysroot)
return 0
-def GenerateLastCommitPosition(header):
+def GenerateLastCommitPosition(host, header):
ROOT_TAG = 'initial-commit'
describe_output = subprocess.check_output(
- ['git', 'describe', 'HEAD', '--match', ROOT_TAG], shell=is_win,
+ ['git', 'describe', 'HEAD', '--match', ROOT_TAG], shell=host.is_windows(),
cwd=REPO_ROOT)
mo = re.match(ROOT_TAG + '-(\d+)-g([0-9a-f]+)', describe_output)
if not mo:
@@ -136,7 +195,7 @@
def WriteGenericNinja(path, static_libraries, executables,
- cc, cxx, ar, ld, options,
+ cc, cxx, ar, ld, platform, host, options,
cflags=[], cflags_cc=[], ldflags=[], libflags=[],
include_dirs=[], solibs=[]):
ninja_header_lines = [
@@ -158,16 +217,16 @@
template_filename = os.path.join(SCRIPT_DIR, {
- 'win32': 'build_win.ninja.template',
+ 'msvc': 'build_win.ninja.template',
'darwin': 'build_mac.ninja.template',
- 'linux2': 'build_linux.ninja.template',
- 'aix6': 'build_aix.ninja.template'
- }[sys.platform])
+ 'linux': 'build_linux.ninja.template',
+ 'aix': 'build_aix.ninja.template',
+ }[platform.platform()])
with open(template_filename) as f:
ninja_template = f.read()
- if is_win:
+ if platform.is_windows():
executable_ext = '.exe'
library_ext = '.lib'
object_ext = '.obj'
@@ -239,13 +298,13 @@
os.path.relpath(template_filename, os.path.dirname(path)) + '\n')
-def WriteGNNinja(path, options, linux_sysroot):
- if is_win:
+def WriteGNNinja(path, platform, host, options, linux_sysroot):
+ if platform.is_msvc():
cc = os.environ.get('CC', 'cl.exe')
cxx = os.environ.get('CXX', 'cl.exe')
ld = os.environ.get('LD', 'link.exe')
ar = os.environ.get('AR', 'lib.exe')
- elif is_aix:
+ elif platform.is_aix():
cc = os.environ.get('CC', 'gcc')
cxx = os.environ.get('CXX', 'g++')
ld = os.environ.get('LD', 'g++')
@@ -263,7 +322,7 @@
include_dirs = [REPO_ROOT, os.path.dirname(path)]
libs = []
- if is_posix:
+ if not platform.is_msvc():
if options.debug:
cflags.extend(['-O0', '-g'])
else:
@@ -275,16 +334,16 @@
# unused functions and data items.
cflags.extend(['-fdata-sections', '-ffunction-sections'])
ldflags.extend(['-fdata-sections', '-ffunction-sections'])
- if is_mac:
+ if platform.is_darwin():
ldflags.append('-Wl,-dead_strip')
- elif not is_aix:
+ elif not platform.is_aix():
# Garbage collection is done by default on aix.
ldflags.append('-Wl,--gc-sections')
# Omit all symbol information from the output file.
- if is_mac:
+ if platform.is_darwin():
ldflags.append('-Wl,-S')
- elif is_aix:
+ elif platform.is_aix():
ldflags.append('-Wl,-s')
else:
ldflags.append('-Wl,-strip-all')
@@ -303,7 +362,7 @@
])
cflags_cc.extend(['-std=c++14', '-Wno-c++11-narrowing'])
- if is_linux:
+ if platform.is_linux():
if linux_sysroot:
# Use the sid sysroot that UpdateLinuxSysroot() downloads.
cflags.append('--sysroot=' + linux_sysroot)
@@ -317,11 +376,11 @@
'-ldl',
'-lpthread',
])
- elif is_mac:
+ elif platform.is_darwin():
min_mac_version_flag = '-mmacosx-version-min=10.9'
cflags.append(min_mac_version_flag)
ldflags.append(min_mac_version_flag)
- elif is_aix:
+ elif platform.is_aix():
cflags_cc.append('-maix64')
ldflags.extend(['-maix64', '-pthread'])
@@ -329,7 +388,7 @@
cflags.extend(['-flto', '-fwhole-program-vtables'])
ldflags.extend(['-flto', '-fwhole-program-vtables'])
- elif is_win:
+ elif platform.is_msvc():
if not options.debug:
cflags.extend(['/Ox', '/DNDEBUG', '/GL'])
libflags.extend(['/LTCG'])
@@ -605,7 +664,7 @@
], 'tool': 'cxx', 'include_dirs': [], 'libs': []},
}
- if is_posix:
+ if platform.is_posix():
static_libraries['base']['sources'].extend([
'base/files/file_enumerator_posix.cc',
'base/files/file_posix.cc',
@@ -615,12 +674,12 @@
'base/strings/string16.cc',
])
- if is_linux or is_aix:
+ if platform.is_linux() or platform.is_aix():
static_libraries['base']['sources'].extend([
'base/strings/sys_string_conversions_posix.cc',
])
- if is_mac:
+ if platform.is_darwin():
static_libraries['base']['sources'].extend([
'base/files/file_util_mac.mm',
'base/mac/bundle_locations.mm',
@@ -635,7 +694,7 @@
'-framework', 'Security',
])
- if is_win:
+ if platform.is_windows():
static_libraries['base']['sources'].extend([
'base/files/file_enumerator_win.cc',
'base/files/file_util_win.cc',
@@ -665,8 +724,8 @@
executables['gn_unittests']['libs'].extend(static_libraries.keys())
WriteGenericNinja(path, static_libraries, executables, cc, cxx, ar, ld,
- options, cflags, cflags_cc, ldflags, libflags, include_dirs,
- libs)
+ platform, host, options, cflags, cflags_cc, ldflags,
+ libflags, include_dirs, libs)
if __name__ == '__main__':
