1#!/usr/bin/env python3
2
3"""Helps manage sysroots."""
4
5import argparse
6import os
7import subprocess
8import sys
9
10
11def make_fake_sysroot(out_dir):
12    def cmdout(cmd):
13        return subprocess.check_output(cmd).decode(sys.stdout.encoding).strip()
14
15    if sys.platform == 'win32':
16        p = os.getenv('ProgramFiles(x86)', 'C:\\Program Files (x86)')
17
18        winsdk = os.getenv('WindowsSdkDir')
19        if not winsdk:
20            winsdk = os.path.join(p, 'Windows Kits', '10')
21            print('%WindowsSdkDir% not set. You might want to run this from')
22            print('a Visual Studio cmd prompt. Defaulting to', winsdk)
23
24        vswhere = os.path.join(
25                p, 'Microsoft Visual Studio', 'Installer', 'vswhere')
26        vcid = 'Microsoft.VisualStudio.Component.VC.Tools.x86.x64'
27        vsinstalldir = cmdout(
28                [vswhere, '-latest', '-products', '*', '-requires', vcid,
29                    '-property', 'installationPath'])
30
31        def mkjunction(dst, src):
32            subprocess.check_call(['mklink', '/j', dst, src], shell=True)
33        os.mkdir(out_dir)
34        mkjunction(os.path.join(out_dir, 'VC'),
35                   os.path.join(vsinstalldir, 'VC'))
36        os.mkdir(os.path.join(out_dir, 'Windows Kits'))
37        mkjunction(os.path.join(out_dir, 'Windows Kits', '10'), winsdk)
38    elif sys.platform == 'darwin':
39        # The SDKs used by default in compiler-rt/cmake/base-config-ix.cmake.
40        # COMPILER_RT_ENABLE_IOS defaults to on.
41        # COMPILER_RT_ENABLE_WATCHOS and COMPILER_RT_ENABLE_TV default to off.
42        # compiler-rt/cmake/config-ix.cmake sets DARWIN_EMBEDDED_PLATFORMS
43        # depending on these.
44        sdks = ['macosx', 'iphoneos', 'iphonesimulator']
45        os.mkdir(out_dir)
46        for sdk in sdks:
47          sdkpath = cmdout(['xcrun', '-sdk', sdk, '-show-sdk-path'])
48          # sdkpath is something like /.../SDKs/MacOSX11.1.sdk, which is a
49          # symlink to MacOSX.sdk in the same directory. Resolve the symlink,
50          # to make the symlink in out_dir less likely to break when the SDK
51          # is updated (which will bump the number on xcrun's output, but not
52          # on the symlink destination).
53          sdkpath = os.path.realpath(sdkpath)
54          os.symlink(sdkpath, os.path.join(out_dir, os.path.basename(sdkpath)))
55    else:
56        os.symlink('/', out_dir)
57
58    print('Done. Pass these flags to cmake:')
59    abs_out_dir = os.path.abspath(out_dir)
60    if sys.platform == 'win32':
61        # CMake doesn't like backslashes in commandline args.
62        abs_out_dir = abs_out_dir.replace(os.path.sep, '/')
63        print('  -DLLVM_WINSYSROOT=' + abs_out_dir)
64    elif sys.platform == 'darwin':
65        flags = [
66          '-DCMAKE_OSX_SYSROOT=' + os.path.join(abs_out_dir, 'MacOSX.sdk'),
67
68          # For find_darwin_sdk_dir() in
69          # compiler-rt/cmake/Modules/CompilerRTDarwinUtils.cmake
70          '-DDARWIN_macosx_CACHED_SYSROOT=' +
71              os.path.join(abs_out_dir, 'MacOSX.sdk'),
72          '-DDARWIN_iphoneos_CACHED_SYSROOT=' +
73              os.path.join(abs_out_dir, 'iPhoneOS.sdk'),
74          '-DDARWIN_iphonesimulator_CACHED_SYSROOT=' +
75              os.path.join(abs_out_dir, 'iPhoneSimulator.sdk'),
76        ]
77        print('  ' + ' '.join(flags))
78    else:
79        print('  -DCMAKE_SYSROOT=' + abs_out_dir + ' to cmake.')
80
81
82def main():
83    parser = argparse.ArgumentParser(description=__doc__)
84
85    subparsers = parser.add_subparsers(dest='command', required=True)
86
87    makefake = subparsers.add_parser('make-fake',
88            help='Create a sysroot that symlinks to local directories.')
89    makefake.add_argument('--out-dir', required=True)
90
91    args = parser.parse_args()
92
93    assert args.command == 'make-fake'
94    make_fake_sysroot(args.out_dir)
95
96
97if __name__ == '__main__':
98    main()
99