path: root/erts/emulator/utils/make_compiler_flags

#!/usr/bin/env perl
#
# %CopyrightBegin%
#
# Copyright Ericsson AB 1999-2009. All Rights Reserved.
#
# The contents of this file are subject to the Erlang Public License,
# Version 1.1, (the "License"); you may not use this file except in
# compliance with the License. You should have received a copy of the
# Erlang Public License along with this software. If not, it can be
# retrieved online at http://www.erlang.org/.
#
# Software distributed under the License is distributed on an "AS IS"
# basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
# the License for the specific language governing rights and limitations
# under the License.
#
# %CopyrightEnd%
#
use strict;
use File::Copy;
# This program generates global constants that contains
# config.h, CFLAGS and LDFLAGS

my $file = "";
my %constants = ();
my $prev_file = "";

while (@ARGV) {
    my $d = shift;
    if ( $d =~ /^-o$/ ) {
	$file = shift or die("-o requires argument");
	open FILE, "<$file" or next;
	$prev_file = do { local $/; <FILE> };
	close FILE;
	next;
    }
    if ( $d =~ /^-f/ ) {
	my $var = shift or die("-f requires two argument");
	my $value = shift or die("-f requires two argument");
	open FILE, "<$value";
	$value = do { local $/; <FILE> };
	close FILE;

	$value =~ s/\n/\\n\\\n/g;

	$constants{$var} = $value;
    }
    if ( $d =~ /^-v/ ) {
	my $var = shift or die("-v requires two argument");
	my $value = shift;
	$constants{$var} = $value;
    }
}

foreach(keys %constants) {
    my $value = $constants{$_};
    $value =~ s/"/\\"/g;
    $constants{$_} = $value
}

# Did we want output to a file?
open(my $oldout, ">&STDOUT")     or die "Can't dup STDOUT: $!";
if ( $file ) {
    open STDOUT, ">$file.tmp" or die("can't open $file for writing");
}

my(@prog) = split('/', $0);
my($prog) = $prog[$#prog];
print "/* Warning: Do not edit this file.\n";
print "   Auto-generated by '$prog'.*/\n";

foreach (sort(keys %constants)) {
    print "const char* erts_build_flags_$_ = \"$constants{$_}\";\n"
}

open(STDOUT, ">&", $oldout) or die "Can't dup \$oldout: $!";

open FILE, "<$file.tmp";
my $new_file = do { local $/; <FILE> };
close FILE;

if ($new_file ne $prev_file) {
    move("$file.tmp","$file");
} else {
    unlink("$file.tmp");
}