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Diffstat (limited to 'utils/gen_link_script.py')
-rwxr-xr-x | utils/gen_link_script.py | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/utils/gen_link_script.py b/utils/gen_link_script.py new file mode 100755 index 000000000000..24fe5ce9904e --- /dev/null +++ b/utils/gen_link_script.py @@ -0,0 +1,84 @@ +#!/usr/bin/env python +#===----------------------------------------------------------------------===## +# +# The LLVM Compiler Infrastructure +# +# This file is dual licensed under the MIT and the University of Illinois Open +# Source Licenses. See LICENSE.TXT for details. +# +#===----------------------------------------------------------------------===## + +import os +import sys + +def print_and_exit(msg): + sys.stderr.write(msg + '\n') + sys.exit(1) + +def usage_and_exit(): + print_and_exit("Usage: ./gen_link_script.py [--help] [--dryrun] <path/to/libcxx.so> <public_libs>...") + +def help_and_exit(): + help_msg = \ +"""Usage + + gen_link_script.py [--help] [--dryrun] <path/to/libcxx.so> <public_libs>... + + Generate a linker script that links libc++ to the proper ABI library. + The script replaces the specified libc++ symlink. + An example script for c++abi would look like "INPUT(libc++.so.1 -lc++abi)". + +Arguments + <path/to/libcxx.so> - The top level symlink to the versioned libc++ shared + library. This file is replaced with a linker script. + <public_libs> - List of library names to include in linker script. + +Exit Status: + 0 if OK, + 1 if the action failed. +""" + print_and_exit(help_msg) + +def parse_args(): + args = list(sys.argv) + del args[0] + if len(args) == 0: + usage_and_exit() + if args[0] == '--help': + help_and_exit() + dryrun = '--dryrun' == args[0] + if dryrun: + del args[0] + if len(args) < 2: + usage_and_exit() + symlink_file = args[0] + public_libs = args[1:] + return dryrun, symlink_file, public_libs + +def main(): + dryrun, symlink_file, public_libs = parse_args() + + # Check that the given libc++.so file is a valid symlink. + if not os.path.islink(symlink_file): + print_and_exit("symlink file %s is not a symlink" % symlink_file) + + # Read the symlink so we know what libc++ to link to in the linker script. + linked_libcxx = os.readlink(symlink_file) + + # Prepare the list of public libraries to link. + public_libs = ['-l%s' % l for l in public_libs] + + # Generate the linker script contents and print the script and destination + # information. + contents = "INPUT(%s %s)" % (linked_libcxx, ' '.join(public_libs)) + print("GENERATING SCRIPT: '%s' as file %s" % (contents, symlink_file)) + + # Remove the existing libc++ symlink and replace it with the script. + if not dryrun: + os.unlink(symlink_file) + with open(symlink_file, 'w') as f: + f.write(contents + "\n") + + +if __name__ == '__main__': + main() |