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Diffstat (limited to 'admin/detect-autoconf.pl')
| -rwxr-xr-x | admin/detect-autoconf.pl | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/admin/detect-autoconf.pl b/admin/detect-autoconf.pl new file mode 100755 index 0000000..7166bce --- /dev/null +++ b/admin/detect-autoconf.pl @@ -0,0 +1,173 @@ +#!/usr/bin/env perl + +# Try to locate best version of auto* +# By Michael Pyne <[email protected]> +# +# Copyright (c) 2005. +# This code is public domain. You may use it however you like (including +# relicensing). + +# Emulate the 'which' program. +sub which +{ + my $prog = shift; + my @paths = split(/:/, $ENV{'PATH'}); + + for $path (@paths) + { + return "$path/$prog" if -x "$path/$prog"; + } + + return ""; +} + +# Subroutine to determine the highest installed version of the given program, +# searching from the given paths. +sub findBest +{ + my ($program, @paths) = @_; + my $best_version_found = '0'; # Deliberately a string. + my %versions; + my %minimumVersions = ( + 'autoconf' => '2.5', + 'automake' => '1.6', + ); + + # Allow user to use environment variable to override search. + return $ENV{uc $program} if $ENV{uc $program}; + + for $prefix (@paths) + { + @files = glob "$prefix/$program*"; + for $file (@files) + { + # Don't check non-executable scripts. + next unless -x $file; + + ($version) = $file =~ /$prefix\/$program-?(.*)$/; + $version =~ s/-|\.//g; + + # Special case some programs to make sure it has a minimum version. + if (not $version and exists $minimumVersions{$program}) + { + my $min_version = $minimumVersions{$program}; + my $versionOutput = `$program --version 2>/dev/null | head -n 1`; + + # If we can't run the script to get the version it likely won't work later. + next unless $versionOutput; + + # Use number.number for version (we don't need the excess in general). + ($versionOutput) = ($versionOutput =~ /(\d\.\d)/); + + # Use lt to do lexicographical comparison of strings (which should be + # equivalent and doesn't involve issues with floating point conversions). + if (not $versionOutput or $versionOutput lt $min_version) + { + next; + } + } + + # If no version suffix then use it in favor of a versioned autotool + # since the ever-popular WANT_AUTOFOO should then work (in theory). + return $file unless $version; + + # Emulate 'which', and abort if we've already seen this version. + next if exists $versions{$version}; + + # Save filename of program. + $versions{$version} = $file; + + # Use string comparison so that e.g. 253a will be > 253 but < 254. + if ($version gt $best_version_found) + { + $best_version_found = $version; + } + } + } + + return $versions{$best_version_found}; +} + +# Find an appropriate "which" program for later use by the shell script calling +# us. +sub findWhich +{ + for $candidate ('type -p', 'which', 'type') + { + $test = `$candidate sh 2>/dev/null`; + chomp $test; + + return $candidate if -x $test; + } +} + +# Uses which() to find a program unless the user provided its path in the +# environment (the upper case program name is searched). +sub findProgram +{ + $suffix = ""; # For use if @_ has only one param. + my ($program, $suffix) = @_; + + return $ENV{uc $program} if $ENV{uc $program}; + return which("$program$suffix"); +} + +# SCRIPT STARTS. + +# Search in path. +@paths = split(/:/, $ENV{'PATH'}); + +# Make sure at least /usr/bin and /usr/local/bin are in this search. +unshift @paths, '/usr/local/bin' unless grep $_ eq '/usr/local/bin', @paths; +unshift @paths, '/usr/bin' unless grep $_ eq '/usr/bin', @paths; + +$autoconf = findBest('autoconf', @paths); +($autoconf_suffix) = $autoconf =~ /.*autoconf(.*)$/; + +# Find matching autoconf companions. +$autoheader = findProgram('autoheader', $autoconf_suffix); +$autom4te = findProgram('autom4te', $autoconf_suffix); + +# Get best automake, and look for unsermake to possibly override it. +$automake = findBest('automake', @paths); +$unsermake = ""; +# backward compatible: if $UNSERMAKE points to a path, use it +$unsermake = findProgram('unsermake') if (defined($ENV{'UNSERMAKE'}) and $ENV{'UNSERMAKE'} =~ /\//); +# new compatible: if it says 'yes', use the one from path +$unsermake = which('unsermake') if ($ENV{'UNSERMAKE'} ne 'no'); + +($automake_suffix) = $automake =~ /.*automake(.*)$/; + +# Use unsermake if we found it. +$automake = "$unsermake -c" if $unsermake; + +# Find matching automake companions. +$aclocal = findProgram('aclocal', $automake_suffix); + +$which = findWhich(); + +# Make sure we have all of the needed programs. +for $i (qw'autoconf autoheader autom4te automake aclocal') +{ + unless(${$i}) + { + print "# Unable to find $i!!\n"; + exit 1; + } +} + +# Print results in eval-able form. +print <<EOF; +AUTOCONF="$autoconf" +AUTOHEADER="$autoheader" +AUTOM4TE="$autom4te" + +AUTOMAKE="$automake" +ACLOCAL="$aclocal" + +WHICH="$which" + +export AUTOCONF AUTOHEADER AUTOM4TE AUTOMAKE ACLOCAL WHICH +EOF + +exit 0; |