build/autoconf/make-makefile
author Jim Blandy <jimb@mozilla.org>
Tue, 26 Aug 2008 14:34:35 -0700
changeset 18461 c397279747fa966ebedd9806d691c7aeede5cbe3
parent 1 9b2a99adc05e53cd4010de512f50118594756650
child 25869 61041f3cf7dae48de97101a243054eef8990c593
permissions -rwxr-xr-x
To allow altoptions.m4 to be shared by both the main Mozilla and the SpiderMonkey build code, sincluding it shouldn't have any side effects. Since only Mozilla wants the side effect, move it to Mozilla's aclocal.m4.

#! /usr/bin/env perl
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# 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.
#
# The Original Code is mozilla.org code.
#
# The Initial Developer of the Original Code is
# Netscape Communications Corporation.
# Portions created by the Initial Developer are Copyright (C) 1999
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
#
# Alternatively, the contents of this file may be used under the terms of
# either of the GNU General Public License Version 2 or later (the "GPL"),
# or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****

# make-makefiles - Quickly create Makefiles for subdirectories.
#      Also, creates any needed subdirectories.
#
# usage: make-makefiles [ -t <topsrcdir> -p <print_topsrcdir> -d <depth> ] [ <subdir> | <subdir>/Makefile ] ...

# Send comments, improvements, bugs to Steve Lamm (slamm@netscape.com).

#$debug = 1;

# Determine various tree path variables
#
($topsrcdir, $ptopsrcdir, $depth, @makefiles) = parse_arguments(@ARGV);

$object_fullpath = `pwd`;
chdir $depth;
$object_root = `pwd`;
chomp $object_fullpath;
chomp $object_root;

# $source_subdir is the path from the object root to where
#    'make-makefile' was called. For example, if make-makefile was
#    called from "mozilla/gfx/src", then $source_subdir would be
#    "gfx/src/".
$source_subdir = "$object_fullpath/";
my $quoted_object_root = quotemeta($object_root);
$source_subdir =~ s|^$quoted_object_root/||;

# Prefix makefiles with $source_subdir so that paths
# will be relative to the top of the object tree.
#
for $makefile (@makefiles) {
  $makefile = "$source_subdir$makefile";
}

create_directories(@makefiles);

# Find the path to the source directory based on how 'make-makefile'
#  was invoked. The path is either relative to the object directory
#  or an absolute path.
$given_srcdir = find_srcdir($topsrcdir, $depth);
$pgiven_srcdir = find_srcdir($ptopsrcdir, $depth);

if ($debug) {
  warn "object_fullpath = $object_fullpath\n";
  warn "object_root     = $object_root\n";
  warn "source_subdir   = $source_subdir\n";
  warn "makefiles       = @makefiles\n";
  warn "given_srcdir    = $given_srcdir\n";
}

@unhandled = update_makefiles($given_srcdir, $pgiven_srcdir, @makefiles);

run_config_status(@unhandled);

# end of Main
############################################################

sub dirname {
 return $_[0] =~ /(.*)\/.*/ ? "$1" : '.';
}

# find_depth: Pull the value of DEPTH out of a Makefile (or Makefile.in)
sub find_depth {
  my $depth = '';
  open(MAKEFILE, "<$_[0]") || die "Unable to open $_[0]: $!\n";
  while (<MAKEFILE>) {
    next unless /^DEPTH\s*=\s*(\..*)/;
    $depth = $1;
    last;
  }
  close MAKEFILE;
  return $depth;
}

sub parse_arguments {
  my @args = @_;
  my $depth = '';
  my $topsrcdir = '';
  my $ptopsrcdir;
  my @makefiles = ();

  while (1) {
    if ($args[0] eq '-d') {
      $depth = $args[1];
      shift @args; 
      shift @args; 
    } elsif ($args[0] eq '-t') {
      $topsrcdir = $args[1];
      shift @args; 
      shift @args; 
    } elsif ($args[0] eq '-p') {
      $ptopsrcdir = $args[1];
      shift @args;
      shift @args;
    } else {
      last;
    }
  }

  if ($topsrcdir eq '') {
    $topsrcdir = $0; # Figure out topsrcdir based on program name.
    $topsrcdir =~ s|/?build/autoconf/.*$||;
  }
  if ($ptopsrcdir eq '') {
    $ptopsrcdir = $topsrcdir;
  }
  if ($depth eq '') {
    # Use $(DEPTH) in the Makefile or Makefile.in to determine the depth
    if (-e "Makefile.in") {
      $depth = find_depth("Makefile.in");
    } elsif (-e "Makefile") {
      $depth = find_depth("Makefile");
    } elsif (-e "../Makefile") {
      $depth = "../".find_depth("../Makefile");
      $depth =~ s/\/\.$//;
    } else {
      warn "Unable to determine depth (e.g. ../..) to root of objdir tree.\n";
      die  "No Makefile(.in) present. Try running with '-d <depth>'\n";
    }
  } 

  # Build the list of makefiles to generate
  #
  @makefiles = ();
  my $makefile;
  foreach $makefile (@args) {
    $makefile =~ s/\.in$//;
    $makefile =~ s/\/$//;
    $makefile =~ /Makefile$/ or $makefile .= "/Makefile";
    push @makefiles, "$makefile";
  }
  @makefiles = "Makefile" unless @args;

  return ($topsrcdir, $ptopsrcdir, $depth, @makefiles);
}


# Create all the directories at once.
#   This can be much faster than calling mkdir() for each one.
sub create_directories {
  my @makefiles = @_;
  my @dirs = ();
  my $ac_file;
  foreach $ac_file (@makefiles) {
    push @dirs, dirname($ac_file);
  }
  # Call mkdir with the directories sorted by subdir count (how many /'s)
  system "mkdir -p ". join(' ', map("\"$_\"", @dirs)) if @dirs;
}

# Find the top of the source directory
# (Assuming that the executable is in $top_srcdir/build/autoconf)
sub find_srcdir {
  my ($ac_given_srcdir, $depth) = @_;

  if ($debug) {
    print "ac_given_srcdir = $ac_given_srcdir\n";
    print "depth           = $depth\n";
  }
  if ($ac_given_srcdir =~ /^\./ and $depth ne '.') {
    my $quoted_depth = quotemeta($depth);
    $ac_given_srcdir =~ s|^$quoted_depth/?||;
  }
  if ($debug) {
    print "ac_given_srcdir = $ac_given_srcdir\n";
  }
  $ac_given_srcdir = '.' if $ac_given_srcdir eq '';
  return $ac_given_srcdir;
}

# Output the makefiles.
#
sub update_makefiles {
  my ($ac_given_srcdir, $pac_given_srcdir, @makefiles) = @_;
  my @unhandled=();

  my $ac_file;
  foreach $ac_file (@makefiles) {
    my $ac_file_in    = "$ac_given_srcdir/${ac_file}.in";
    my $ac_dir        = dirname($ac_file);
    my $ac_dots       = '';
    my $ac_dir_suffix = '';
    my $srcdir        = '.';
    my $top_srcdir    = '.';

    # Determine $srcdir and $top_srcdir
    #
    if ($ac_dir ne '.') {
      $ac_dir_suffix = "/$ac_dir";
      $ac_dir_suffix =~ s%^/\./%/%;
      $ac_dots = $ac_dir_suffix;
      # Remove .. components from the provided dir suffix, and
      # also the forward path components they were reversing.
      my $backtracks = $ac_dots =~ s%\.\.(/|$)%%g;
      while ($backtracks--) {
        $ac_dots =~ s%/[^/]*%%;
      }
      $ac_dots =~ s%/[^/]*%../%g;
    }
    if ($ac_given_srcdir eq '.') {
      if ($ac_dots ne '') {
        $top_srcdir = $ac_dots;
        $top_srcdir =~ s%/$%%;
      }
    } elsif ($pac_given_srcdir =~ m%^/% or $pac_given_srcdir =~ m%^.:/%) {
      $srcdir     = "$pac_given_srcdir$ac_dir_suffix";
      $top_srcdir = "$pac_given_srcdir";
    } else {
      if ($debug) {
      	print "ac_dots       = $ac_dots\n";
	print "ac_dir_suffix = $ac_dir_suffix\n";
      }
      $srcdir     = "$ac_dots$ac_given_srcdir$ac_dir_suffix";
      $top_srcdir = "$ac_dots$ac_given_srcdir";
    }

    if ($debug) {
      print "ac_dir     = $ac_dir\n";
      print "ac_file    = $ac_file\n";
      print "ac_file_in = $ac_file_in\n";
      print "srcdir     = $srcdir\n";
      print "top_srcdir = $top_srcdir\n";
      print "cwd        = " . `pwd` . "\n";
    }

    # Copy the file and make substitutions.
    #    @srcdir@     -> value of $srcdir
    #    @top_srcdir@ -> value of $top_srcdir
    #
    if (-e $ac_file) {
      next if -M _ < -M $ac_file_in;  # Next if Makefile is up-to-date.
      warn "updating $ac_file\n";
    } else {
      warn "creating $ac_file\n";
    }

    open INFILE, "<$ac_file_in" or do {
      warn "$0: Cannot read $ac_file_in: No such file or directory\n";
      next;
    };
    open OUTFILE, ">$ac_file" or do {
      warn "$0: Unable to create $ac_file\n";
      next;
    };

    while (<INFILE>) {
      #if (/\@[_a-zA-Z]*\@.*\@[_a-zA-Z]*\@/) {
      #  #warn "Two defines on a line:$ac_file:$.:$_";
      #  push @unhandled, $ac_file;
      #  last;
      #}

      s/\@srcdir\@/$srcdir/g;
      s/\@top_srcdir\@/$top_srcdir/g;

      if (/\@[_a-zA-Z]*\@/) {
        #warn "Unknown variable:$ac_file:$.:$_";
        push @unhandled, $ac_file;
        last;
      }
      print OUTFILE;
    }
    close INFILE;
    close OUTFILE;
  }
  return @unhandled;
}

sub run_config_status {
  my @unhandled = @_;

  # Run config.status with any unhandled files.
  #
  if (@unhandled) {
    $ENV{CONFIG_FILES}= join ' ', @unhandled;
    system "./config.status";
  }
}