713 lines
16 KiB
Perl
713 lines
16 KiB
Perl
package Imager::Probe;
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use 5.006;
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use strict;
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use File::Spec;
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use Config;
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use Cwd ();
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our $VERSION = "1.007";
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my @alt_transfer = qw/altname incsuffix libbase/;
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sub probe {
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my ($class, $req) = @_;
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$req->{verbose} ||= $ENV{IM_VERBOSE};
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my $name = $req->{name};
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my $result;
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if ($req->{code}) {
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$result = _probe_code($req);
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}
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if (!$result && $req->{pkg}) {
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$result = _probe_pkg($req);
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}
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if (!$result && $req->{inccheck} && ($req->{libcheck} || $req->{libbase})) {
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$req->{altname} ||= "main";
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$result = _probe_check($req);
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}
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if ($result && $req->{testcode}) {
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$result = _probe_test($req, $result);
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}
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if (!$result && $req->{alternatives}) {
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ALTCHECK:
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my $index = 1;
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for my $alt (@{$req->{alternatives}}) {
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$req->{altname} = $alt->{altname} || "alt $index";
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$req->{verbose}
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and print "$req->{name}: Trying alternative $index\n";
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my %work = %$req;
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for my $key (@alt_transfer) {
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exists $alt->{$key} and $work{$key} = $alt->{$key};
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}
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$result = _probe_check(\%work);
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if ($result && $req->{testcode}) {
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$result = _probe_test(\%work, $result);
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}
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$result
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and last;
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++$index;
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}
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}
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if (!$result && $req->{testcode}) {
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$result = _probe_fake($req);
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$result or return;
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$result = _probe_test($req, $result);
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}
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$result or return;
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return $result;
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}
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sub _probe_code {
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my ($req) = @_;
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my $code = $req->{code};
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my @probes = ref $code eq "ARRAY" ? @$code : $code;
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my $result;
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for my $probe (@probes) {
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$result = $probe->($req)
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and return $result;
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}
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return;
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}
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sub is_exe {
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my ($name) = @_;
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my @exe_suffix = $Config{_exe};
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if ($^O eq 'MSWin32') {
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push @exe_suffix, qw/.bat .cmd/;
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}
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elsif ($^O eq 'cygwin') {
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push @exe_suffix, "";
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}
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for my $dir (File::Spec->path) {
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for my $suffix (@exe_suffix) {
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-x File::Spec->catfile($dir, "$name$suffix")
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and return 1;
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}
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}
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return;
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}
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sub _probe_pkg {
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my ($req) = @_;
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# Setup pkg-config's environment variable to search non-standard paths
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# which may be provided by --libdirs.
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my @pkgcfg_paths = map { "$_/pkgconfig" } _lib_paths( $req );
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push @pkgcfg_paths, $ENV{ 'PKG_CONFIG_PATH' } if $ENV{ 'PKG_CONFIG_PATH' };
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local $ENV{ 'PKG_CONFIG_PATH' } = join $Config{path_sep}, @pkgcfg_paths;
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is_exe('pkg-config') or return;
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my $redir = $^O eq 'MSWin32' ? '' : '2>/dev/null';
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my @pkgs = @{$req->{pkg}};
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for my $pkg (@pkgs) {
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if (!system("pkg-config $pkg --exists $redir")) {
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# if we find it, but the following fail, then pkg-config is too
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# broken to be useful
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my $cflags = `pkg-config $pkg --cflags`
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and !$? or return;
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my $lflags = `pkg-config $pkg --libs`
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and !$? or return;
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my $defines = '';
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$cflags =~ s/(-D\S+)/$defines .= " $1"; ''/ge;
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chomp $cflags;
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chomp $lflags;
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print "$req->{name}: Found via pkg-config $pkg\n";
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print <<EOS if $req->{verbose};
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cflags: $cflags
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defines: $defines
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lflags: $lflags
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EOS
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# rt 75869
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# if Win32 doesn't provide this information, too bad
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if (!grep(/^-L/, split " ", $lflags)
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&& $^O ne 'MSWin32') {
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# pkg-config told us about the library, make sure it's
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# somewhere EU::MM can find it
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print "Checking if EU::MM can find $lflags\n" if $req->{verbose};
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my ($extra, $bs_load, $ld_load, $ld_run_path) =
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ExtUtils::Liblist->ext($lflags, $req->{verbose});
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unless ($ld_run_path) {
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# search our standard places
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$lflags = _resolve_libs($req, $lflags);
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}
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}
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return
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{
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INC => $cflags,
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LIBS => $lflags,
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DEFINE => $defines,
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};
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}
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}
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print "$req->{name}: Not found via pkg-config\n";
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return;
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}
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sub _is_msvc {
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return $Config{cc} eq "cl";
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}
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sub _lib_basename {
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my ($base) = @_;
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if (_is_msvc()) {
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return $base;
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}
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else {
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return "lib$base";
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}
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}
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sub _lib_option {
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my ($base) = @_;
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if (_is_msvc()) {
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return $base . $Config{_a};
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}
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else {
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return "-l$base";
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}
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}
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sub _quotearg {
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my ($opt) = @_;
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return $opt =~ /\s/ ? qq("$opt") : $opt;
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}
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sub _probe_check {
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my ($req) = @_;
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my @libcheck;
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my @libbase;
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if ($req->{libcheck}) {
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if (ref $req->{libcheck} eq "ARRAY") {
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push @libcheck, @{$req->{libcheck}};
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}
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else {
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push @libcheck, $req->{libcheck};
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}
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}
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elsif ($req->{libbase}) {
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@libbase = ref $req->{libbase} ? @{$req->{libbase}} : $req->{libbase};
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my $lext=$Config{'so'}; # Get extensions of libraries
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my $aext=$Config{'_a'};
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for my $libbase (@libbase) {
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my $basename = _lib_basename($libbase);
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push @libcheck, sub {
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-e File::Spec->catfile($_[0], "$basename$aext")
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|| -e File::Spec->catfile($_[0], "$basename.$lext")
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};
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}
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}
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else {
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print "$req->{name}: No libcheck or libbase, nothing to search for\n"
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if $req->{verbose};
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return;
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}
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my @found_libpath;
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my @lib_search = _lib_paths($req);
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print "$req->{name}: Searching directories for libraries:\n"
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if $req->{verbose};
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for my $libcheck (@libcheck) {
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for my $path (@lib_search) {
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print "$req->{name}: $path\n" if $req->{verbose};
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if ($libcheck->($path)) {
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print "$req->{name}: Found!\n" if $req->{verbose};
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push @found_libpath, $path;
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last;
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}
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}
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}
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my $found_incpath;
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my $inccheck = $req->{inccheck};
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my @inc_search = _inc_paths($req);
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print "$req->{name}: Searching directories for headers:\n"
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if $req->{verbose};
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for my $path (@inc_search) {
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print "$req->{name}: $path\n" if $req->{verbose};
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if ($inccheck->($path)) {
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print "$req->{name}: Found!\n" if $req->{verbose};
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$found_incpath = $path;
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last;
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}
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}
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my $alt = "";
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if ($req->{altname}) {
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$alt = " $req->{altname}:";
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}
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print "$req->{name}:$alt includes ", $found_incpath ? "" : "not ",
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"found - libraries ", @found_libpath == @libcheck ? "" : "not ", "found\n";
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@found_libpath == @libcheck && $found_incpath
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or return;
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my @libs = map "-L$_", @found_libpath;
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if ($req->{libopts}) {
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push @libs, $req->{libopts};
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}
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elsif (@libbase) {
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push @libs, map _lib_option($_), @libbase;
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}
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else {
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die "$req->{altname}: inccheck but no libbase or libopts";
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}
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return
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{
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INC => _quotearg("-I$found_incpath"),
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LIBS => join(" ", map _quotearg($_), @libs),
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DEFINE => "",
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};
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}
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sub _probe_fake {
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my ($req) = @_;
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# the caller provided test code, and the compiler may look in
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# places we don't, see Imager-Screenshot ticket 56793,
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# so fake up a result so the test code can
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my $lopts;
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if ($req->{libopts}) {
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$lopts = $req->{libopts};
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}
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elsif (defined $req->{libbase}) {
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# might not need extra libraries, eg. Win32 perl already links
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# everything
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my @libs = $req->{libbase}
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? ( ref $req->{libbase} ? @{$req->{libbase}} : $req->{libbase} )
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: ();
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$lopts = join " ", map _lib_option($_), @libs;
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}
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if (defined $lopts) {
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print "$req->{name}: Checking if the compiler can find them on its own\n";
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return
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{
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INC => "",
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LIBS => $lopts,
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DEFINE => "",
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};
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}
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else {
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print "$req->{name}: Can't fake it - no libbase or libopts\n"
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if $req->{verbose};
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return;
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}
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}
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sub _probe_test {
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my ($req, $result) = @_;
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require Devel::CheckLib;
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# setup LD_RUN_PATH to match link time
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print "Asking liblist for LD_RUN_PATH:\n" if $req->{verbose};
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my ($extra, $bs_load, $ld_load, $ld_run_path) =
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ExtUtils::Liblist->ext($result->{LIBS}, $req->{verbose});
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local $ENV{LD_RUN_PATH};
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if ($ld_run_path) {
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print "Setting LD_RUN_PATH=$ld_run_path for $req->{name} probe\n"
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if $req->{verbose};
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$ENV{LD_RUN_PATH} = $ld_run_path;
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if ($Config{lddlflags} =~ /([^ ]*-(?:rpath|R)[,=]?)([^ ]+)/
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&& -d $2) {
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# hackety, hackety
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# LD_RUN_PATH is ignored when there's already an -rpath option
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# so provide one
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my $prefix = $1;
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$result->{LDDLFLAGS} = $Config{lddlflags} . " " .
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join " ", map "$prefix$_", split $Config{path_sep}, $ld_run_path;
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}
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}
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my $good =
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Devel::CheckLib::check_lib
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(
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debug => $req->{verbose},
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LIBS => [ $result->{LIBS} ],
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INC => $result->{INC},
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header => $req->{testcodeheaders},
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function => $req->{testcode},
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prologue => $req->{testcodeprologue},
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);
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unless ($good) {
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print "$req->{name}: Test code failed: $@";
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return;
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}
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print "$req->{name}: Passed code check\n";
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return $result;
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}
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sub _resolve_libs {
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my ($req, $lflags) = @_;
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my @libs = grep /^-l/, split ' ', $lflags;
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my %paths;
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my @paths = _lib_paths($req);
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my $so = $Config{so};
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my $libext = $Config{_a};
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for my $lib (@libs) {
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$lib =~ s/^-l/lib/;
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for my $path (@paths) {
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if (-e "$path/$lib.$so" || -e "$path/$lib$libext") {
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$paths{$path} = 1;
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}
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}
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}
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return join(" ", ( map "-L$_", keys %paths ), $lflags );
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}
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sub _lib_paths {
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my ($req) = @_;
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print "$req->{name} IM_LIBPATH: $ENV{IM_LIBPATH}\n"
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if $req->{verbose} && defined $ENV{IM_LIBPATH};
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print "$req->{name} LIB: $ENV{IM_LIBPATH}\n"
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if $req->{verbose} && defined $ENV{LIB} && $^O eq "MSWin32";
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my $lp = $req->{libpath};
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print "$req->{name} libpath: ", ref $lp ? join($Config{path_sep}, @$lp) : $lp, "\n"
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if $req->{verbose} && defined $lp;
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return _paths
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(
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$ENV{IM_LIBPATH},
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$req->{libpath},
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(
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map { split ' ' }
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grep $_,
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@Config{qw/loclibpth libpth libspath/}
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),
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$^O eq "MSWin32" ? $ENV{LIB} : "",
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$^O eq "cygwin" ? "/usr/lib/w32api" : "",
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"/usr/lib",
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"/usr/local/lib",
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_gcc_lib_paths(),
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_dyn_lib_paths(),
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);
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}
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sub _gcc_lib_paths {
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$Config{gccversion}
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or return;
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my ($base_version) = $Config{gccversion} =~ /^([0-9]+)/
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or return;
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$base_version >= 4
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or return;
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local $ENV{LANG} = "C";
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local $ENV{LC_ALL} = "C";
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my ($lib_line) = grep /^libraries:/, `$Config{cc} -print-search-dirs`
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or return;
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$lib_line =~ s/^libraries: =//;
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chomp $lib_line;
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return grep !/gcc/ && -d, split /:/, $lib_line;
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}
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sub _dyn_lib_paths {
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return map { defined() ? split /\Q$Config{path_sep}/ : () }
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map $ENV{$_},
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qw(LD_RUN_PATH LD_LIBRARY_PATH DYLD_LIBRARY_PATH LIBRARY_PATH);
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}
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sub _inc_paths {
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my ($req) = @_;
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print "$req->{name} IM_INCPATH: $ENV{IM_INCPATH}\n"
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if $req->{verbose} && defined $ENV{IM_INCPATH};
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print "$req->{name} INCLUDE: $ENV{INCLUDE}\n"
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if $req->{verbose} && defined $ENV{INCLUDE} && $^O eq "MSWin32";
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my $ip = $req->{incpath};
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print "$req->{name} incpath: ", ref $ip ? join($Config{path_sep}, @$ip) : $ip, "\n"
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if $req->{verbose} && defined $req->{incpath};
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my @paths = _paths
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(
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$ENV{IM_INCPATH},
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$req->{incpath},
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$^O eq "MSWin32" ? $ENV{INCLUDE} : "",
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$^O eq "cygwin" ? "/usr/include/w32api" : "",
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(
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map { split ' ' }
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grep $_,
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@Config{qw/locincpth incpath/}
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),
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"/usr/include",
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"/usr/local/include",
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_gcc_inc_paths(),
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_dyn_inc_paths(),
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);
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if ($req->{incsuffix}) {
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@paths = map File::Spec->catdir($_, $req->{incsuffix}), @paths;
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}
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return @paths;
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}
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sub _gcc_inc_paths {
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$Config{gccversion}
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or return;
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my ($base_version) = $Config{gccversion} =~ /^([0-9]+)/
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or return;
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$base_version >= 4
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or return;
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local $ENV{LANG} = "C";
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local $ENV{LC_ALL} = "C";
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my $devnull = File::Spec->devnull;
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my @spam = `$Config{cc} -E -v - <$devnull 2>&1`;
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# output includes lines like:
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# ...
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# ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../x86_64-linux-gnu/include"
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# #include "..." search starts here:
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# #include <...> search starts here:
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# /usr/lib/gcc/x86_64-linux-gnu/4.9/include
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# /usr/local/include
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# /usr/lib/gcc/x86_64-linux-gnu/4.9/include-fixed
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# /usr/include/x86_64-linux-gnu
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# /usr/include
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# End of search list.
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# # 1 "<stdin>"
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# # 1 "<built-in>"
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# ...
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while (@spam && $spam[0] !~ /^#include /) {
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shift @spam;
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}
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my @inc;
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while (@spam && $spam[0] !~ /^End of search/) {
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my $line = shift @spam;
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chomp $line;
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next if $line =~ /^#include /;
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next unless $line =~ s/^\s+//;
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push @inc, $line;
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}
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return @inc;
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}
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sub _dyn_inc_paths {
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return map {
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my $tmp = $_;
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$tmp =~ s/\blib$/include/ ? $tmp : ()
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} _dyn_lib_paths();
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}
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sub _paths {
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my (@in) = @_;
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my @out;
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# expand any array refs
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@in = map { ref() ? @$_ : $_ } @in;
|
|
|
|
for my $path (@in) {
|
|
$path or next;
|
|
$path = _tilde_expand($path);
|
|
|
|
push @out, grep -d $_, split /\Q$Config{path_sep}/, $path;
|
|
}
|
|
|
|
@out = map Cwd::realpath($_), @out;
|
|
|
|
my %seen;
|
|
@out = grep !$seen{$_}++, @out;
|
|
|
|
return @out;
|
|
}
|
|
|
|
my $home;
|
|
sub _tilde_expand {
|
|
my ($path) = @_;
|
|
|
|
if ($path =~ m!^~[/\\]!) {
|
|
defined $home or $home = $ENV{HOME};
|
|
if (!defined $home && $^O eq 'MSWin32'
|
|
&& defined $ENV{HOMEDRIVE} && defined $ENV{HOMEPATH}) {
|
|
$home = $ENV{HOMEDRIVE} . $ENV{HOMEPATH};
|
|
}
|
|
unless (defined $home) {
|
|
$home = eval { (getpwuid($<))[7] };
|
|
}
|
|
defined $home or die "You supplied $path, but I can't find your home directory\n";
|
|
$path =~ s/^~//;
|
|
$path = File::Spec->catdir($home, $path);
|
|
}
|
|
|
|
return $path;
|
|
}
|
|
|
|
1;
|
|
|
|
__END__
|
|
|
|
=head1 NAME
|
|
|
|
Imager::Probe - hot needle of inquiry for libraries
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
require Imager::Probe;
|
|
|
|
my %probe =
|
|
(
|
|
# short name of what we're looking for (displayed to user)
|
|
name => "FOO",
|
|
# pkg-config lookup
|
|
pkg => [ qw/name1 name2 name3/ ],
|
|
# perl subs that probe for the library
|
|
code => [ \&foo_probe1, \&foo_probe2 ],
|
|
# or just: code => \&foo_probe,
|
|
inccheck => sub { ... },
|
|
libcheck => sub { ... },
|
|
# search for this library if libcheck not supplied
|
|
libbase => "foo",
|
|
# library link time options, uses libbase to build options otherwise
|
|
libopts => "-lfoo",
|
|
# C code to check the library is sane
|
|
testcode => "...",
|
|
# header files needed
|
|
testcodeheaders => [ "stdio.h", "foo.h" ],
|
|
);
|
|
my $result = Imager::Probe->probe(\%probe)
|
|
or print "Foo library not found: ",Imager::Probe->error;
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
Does the probes that were hidden in Imager's F<Makefile.PL>, pulled
|
|
out so the file format libraries can be externalized.
|
|
|
|
The return value is either nothing if the probe fails, or a hash
|
|
containing:
|
|
|
|
=over
|
|
|
|
=item *
|
|
|
|
C<INC> - C<-I> and other C options
|
|
|
|
=item *
|
|
|
|
C<LIBS> - C<-L>, C<-l> and other link-time options
|
|
|
|
=item *
|
|
|
|
C<DEFINE> - C<-D> options, if any.
|
|
|
|
=back
|
|
|
|
The possible values for the hash supplied to the probe() method are:
|
|
|
|
=over
|
|
|
|
=item *
|
|
|
|
C<pkg> - an array of F<pkg-config> names to probe for. If the
|
|
F<pkg-config> checks pass, C<inccheck> and C<libcheck> aren't used.
|
|
|
|
=item *
|
|
|
|
C<inccheck> - a code reference that checks if the supplied include
|
|
directory contains the required header files.
|
|
|
|
=item *
|
|
|
|
C<libcheck> - a code reference that checks if the supplied library
|
|
directory contains the required library files. Note: the
|
|
F<Makefile.PL> version of this was supplied all of the library file
|
|
names instead. C<libcheck> can also be an arrayref of library check
|
|
code references, all of which must find a match for the library to be
|
|
considered "found".
|
|
|
|
=item *
|
|
|
|
C<libbase> - if C<inccheck> is supplied, but C<libcheck> isn't, then a
|
|
C<libcheck> that checks for C<lib>I<libbase>I<$Config{_a}> and
|
|
C<lib>I<libbase>.I<$Config{so}> is created. If C<libopts> isn't
|
|
supplied then that can be synthesized as C<< -lI<libbase>
|
|
>>. C<libbase> can also be an arrayref of library base names to search
|
|
for, in which case all of the libraries mentioned must be found for
|
|
the probe to succeed.
|
|
|
|
=item *
|
|
|
|
C<libopts> - if the libraries are found via C<inccheck>/C<libcheck>,
|
|
these are the C<-l> options to supply during the link phase.
|
|
|
|
=item *
|
|
|
|
C<code> - a code reference to perform custom checks. Returns the
|
|
probe result directly. Can also be an array ref of functions to call.
|
|
|
|
=item *
|
|
|
|
C<testcode> - test C code that is run with Devel::CheckLib. You also
|
|
need to set C<testcodeheaders>.
|
|
|
|
=item *
|
|
|
|
C<testcodeprologue> - C code to insert between the headers and the
|
|
main function.
|
|
|
|
=item *
|
|
|
|
C<incpath> - C<$Config{path_sep}> separated list of header file
|
|
directories to check, or a reference to an array of such.
|
|
|
|
=item *
|
|
|
|
C<libpath> - C<$Config{path_sep}> separated list of library file
|
|
directories to check, or a reference to an array of such.
|
|
|
|
=item *
|
|
|
|
C<alternatives> - an optional array reference of alternate
|
|
configurations (as hash references) to test if the primary
|
|
configuration isn't successful. Each alternative should include an
|
|
C<altname> key describing the alternative. Any key not mentioned in
|
|
an alternative defaults to the value from the main configuration.
|
|
|
|
=back
|
|
|
|
=head1 AUTHOR
|
|
|
|
Tony Cook <tonyc@cpan.org>, Arnar M. Hrafnkelsson
|
|
|
|
=cut
|