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103 lines
2.8 KiB
103 lines
2.8 KiB
5 months ago
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#! /usr/bin/perl
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#
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# Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License, version 2.0,
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# as published by the Free Software Foundation.
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#
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# This program is also distributed with certain software (including
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# but not limited to OpenSSL) that is licensed under separate terms,
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# as designated in a particular file or component or in included license
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# documentation. The authors of MySQL hereby grant you an additional
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# permission to link the program and your derivative works with the
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# separately licensed software that they have included with MySQL.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License, version 2.0, for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#
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#
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# Take the given GCC command line and run it with all absolute paths
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# changed to relative paths. This makes sure that no part of the build
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# path leaks into the .o files, which it normally would through the
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# contents of __FILE__. (Debug information is also affected, but that
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# is already fixed through -fdebug-prefix-map=.)
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#
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# A more elegant solution would be -ffile-prefix-map=, but this is
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# not currently supported in GCC; see
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# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70268.
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#
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use strict;
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use warnings;
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use Cwd;
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my $cwd = getcwd();
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my @newarg = ($ARGV[0]);
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for my $i (1..$#ARGV) {
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my $arg = $ARGV[$i];
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if ($arg =~ /-I(.+)$/) {
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$arg = '-I' . relativize($1, $cwd);
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} elsif ($arg =~ /^\//) {
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$arg = relativize($arg, $cwd);
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}
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push @newarg, $arg;
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}
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exec(@newarg);
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# /a/b/c/foo from /a/b/d = ../c/foo
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sub relativize {
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my ($dir1, $dir2) = @_;
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if ($dir1 !~ /^\//) {
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# Not an absolute path.
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return $dir1;
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}
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if (! -e $dir1) {
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print STDERR "Unknown file/directory $dir1.\n";
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return $dir1;
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}
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# Resolve symlinks and such, because getcwd() does.
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$dir1 = Cwd::abs_path($dir1);
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if ($dir1 =~ /^\/(lib|tmp|usr)/) {
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# Not related to our source code.
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return $dir1;
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}
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if ($dir1 eq $dir2) {
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return ".";
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}
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my (@dir1_components) = split /\//, $dir1;
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my (@dir2_components) = split /\//, $dir2;
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# Remove common leading components.
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while (scalar @dir1_components > 0 && scalar @dir2_components > 0 &&
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$dir1_components[0] eq $dir2_components[0]) {
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shift @dir1_components;
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shift @dir2_components;
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}
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my $ret = "";
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for my $i (0..$#dir2_components) {
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$ret .= '../';
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}
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$ret .= join('/', @dir1_components);
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# print STDERR "[$dir1] from [$dir2] => [$ret]\n";
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return $ret;
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}
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