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356 lines
11 KiB
Plaintext
356 lines
11 KiB
Plaintext
#!@PERL@
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#
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# Program: llvm-config
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#
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# Synopsis: Prints out compiler options needed to build against an installed
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# copy of LLVM.
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#
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# Syntax: llvm-config OPTIONS... [COMPONENTS...]
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#
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# This file was written by Eric Kidd, and is placed into the public domain.
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#
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use 5.006;
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use strict;
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use warnings;
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#---- begin autoconf values ----
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my $VERSION = q{@PACKAGE_VERSION@};
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my $PREFIX = q{@LLVM_PREFIX@};
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my $BINDIR = "$PREFIX/bin";
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my $INCLUDEDIR = "$PREFIX/include";
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my $LIBDIR = "$PREFIX/lib";
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my $ARCH = lc(q{@ARCH@});
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my $TARGET_HAS_JIT = q{@TARGET_HAS_JIT@};
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my @TARGETS_BUILT = map { lc($_) } qw{@TARGETS_TO_BUILD@};
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#---- end autoconf values ----
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#---- begin Makefile values ----
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my $CXXFLAGS = q{@LLVM_CXXFLAGS@};
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my $LDFLAGS = q{@LLVM_LDFLAGS@};
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#---- end Makefile values ----
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sub usage;
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sub fix_library_names (@);
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sub expand_dependecies (@);
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sub name_map_entries;
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# Parse our command-line arguments.
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usage if @ARGV == 0;
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my @components;
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my $has_opt = 0;
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my $want_libs = 0;
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my $want_libnames = 0;
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my $want_components = 0;
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foreach my $arg (@ARGV) {
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if ($arg =~ /^-/) {
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if ($arg eq "--version") {
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$has_opt = 1; print "$VERSION\n";
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} elsif ($arg eq "--prefix") {
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$has_opt = 1; print "$PREFIX\n";
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} elsif ($arg eq "--bindir") {
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$has_opt = 1; print "$BINDIR\n";
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} elsif ($arg eq "--includedir") {
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$has_opt = 1; print "$INCLUDEDIR\n";
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} elsif ($arg eq "--libdir") {
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$has_opt = 1; print "$LIBDIR\n";
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} elsif ($arg eq "--cxxflags") {
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$has_opt = 1; print "-I$INCLUDEDIR $CXXFLAGS\n";
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} elsif ($arg eq "--ldflags") {
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$has_opt = 1; print "-L$LIBDIR $LDFLAGS\n";
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} elsif ($arg eq "--libs") {
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$has_opt = 1; $want_libs = 1;
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} elsif ($arg eq "--libnames") {
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$has_opt = 1; $want_libnames = 1;
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} elsif ($arg eq "--components") {
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$has_opt = 1; print join(' ', name_map_entries), "\n";
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} elsif ($arg eq "--targets-built") {
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$has_opt = 1; print join(' ', @TARGETS_BUILT), "\n";
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} else {
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usage();
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}
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} else {
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push @components, $arg;
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}
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}
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# If no options were specified, fail.
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usage unless $has_opt;
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# If no components were specified, default to 'all'.
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if (@components == 0) {
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push @components, 'all';
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}
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# Handle any arguments which require building our dependency graph.
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if ($want_libs || $want_libnames) {
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my @libs = expand_dependecies(@components);
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if ($want_libs) {
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print join(' ', fix_library_names(@libs)), "\n";
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}
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if ($want_libnames) {
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print join(' ', @libs), "\n";
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}
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}
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exit 0;
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#==========================================================================
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# Support Routines
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#==========================================================================
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sub usage {
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print STDERR <<__EOD__;
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Usage: llvm-config <OPTION>... [<COMPONENT>...]
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Get various configuration information needed to compile programs which use
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LLVM. Typically called from 'configure' scripts. Examples:
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llvm-config --cxxflags
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llvm-config --ldflags
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llvm-config --libs engine bcreader scalaropts
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Options:
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--version LLVM version.
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--prefix Installation prefix.
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--bindir Directory containing LLVM executables.
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--includedir Directory containing LLVM headers.
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--libdir Directory containing LLVM libraries.
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--cxxflags C++ compiler flags for files that include LLVM headers.
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--ldflags Linker flags.
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--libs Libraries needed to link against LLVM components.
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--libnames Bare library names for in-tree builds.
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--components List of all possible components.
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--targets-built List of all targets currently built.
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Typical components:
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all All LLVM libraries (default).
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backend Either a native backend or the C backend.
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engine Either a native JIT or a bytecode interpreter.
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__EOD__
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exit(1);
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}
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# Use -lfoo instead of libfoo.a whenever possible, and add directories to
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# files which can't be found using -L.
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sub fix_library_names (@) {
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my @libs = @_;
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my @result;
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foreach my $lib (@libs) {
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# Transform the bare library name appropriately.
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my ($basename) = ($lib =~ /^lib([^.]*)\.a/);
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if (defined $basename) {
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push @result, "-l$basename";
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} else {
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push @result, "$LIBDIR/$lib";
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}
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}
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return @result;
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}
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#==========================================================================
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# Library Dependency Analysis
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#==========================================================================
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# Given a few human-readable library names, find all their dependencies
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# and sort them into an order which the linker will like. If we packed
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# our libraries into fewer archives, we could make the linker do much
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# of this work for us.
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#
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# Libraries have two different types of names in this code: Human-friendly
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# "component" names entered on the command-line, and the raw file names
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# we use internally (and ultimately pass to the linker).
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#
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# To understand this code, you'll need a working knowledge of Perl 5,
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# and possibly some quality time with 'man perlref'.
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sub load_dependencies;
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sub build_name_map;
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sub have_native_backend;
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sub find_best_engine;
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sub expand_names (@);
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sub find_all_required_sets (@);
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sub find_all_required_sets_helper ($$@);
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# Each "set" contains one or more libraries which must be included as a
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# group (due to cyclic dependencies). Sets are represented as a Perl array
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# reference pointing to a list of internal library names.
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my @SETS;
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# Various mapping tables.
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my %LIB_TO_SET_MAP; # Maps internal library names to their sets.
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my %SET_DEPS; # Maps sets to a list of libraries they depend on.
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my %NAME_MAP; # Maps human-entered names to internal names.
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# Have our dependencies been loaded yet?
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my $DEPENDENCIES_LOADED = 0;
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# Given a list of human-friendly component names, translate them into a
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# complete set of linker arguments.
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sub expand_dependecies (@) {
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my @libs = @_;
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load_dependencies;
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my @required_sets = find_all_required_sets(expand_names(@libs));
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my @sorted_sets = topologically_sort_sets(@required_sets);
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# Expand the library sets into libraries.
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my @result;
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foreach my $set (@sorted_sets) { push @result, @{$set}; }
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return @result;
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}
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# Load in the raw dependency data stored at the end of this file.
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sub load_dependencies {
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return if $DEPENDENCIES_LOADED;
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$DEPENDENCIES_LOADED = 1;
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while (<DATA>) {
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# Parse our line.
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my ($libs, $deps) = /^(^[^:]+): ?(.*)$/;
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die "Malformed dependency data" unless defined $deps;
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my @libs = split(' ', $libs);
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my @deps = split(' ', $deps);
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# Record our dependency data.
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my $set = \@libs;
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push @SETS, $set;
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foreach my $lib (@libs) { $LIB_TO_SET_MAP{$lib} = $set; }
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$SET_DEPS{$set} = \@deps;
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}
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build_name_map;
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}
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# Build a map converting human-friendly component names into internal
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# library names.
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sub build_name_map {
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# Add entries for all the actual libraries.
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foreach my $set (@SETS) {
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foreach my $lib (sort @$set) {
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my $short_name = $lib;
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$short_name =~ s/^(lib)?LLVM([^.]*)\..*$/$2/;
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$short_name =~ tr/A-Z/a-z/;
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$NAME_MAP{$short_name} = [$lib];
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}
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}
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# Add virtual entries.
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$NAME_MAP{'native'} = have_native_backend() ? [$ARCH] : [];
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$NAME_MAP{'backend'} = have_native_backend() ? ['native'] : ['cbackend'];
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$NAME_MAP{'engine'} = find_best_engine;
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$NAME_MAP{'all'} = [name_map_entries]; # Must be last.
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}
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# Return true if we have a native backend to use.
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sub have_native_backend {
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my %BUILT;
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foreach my $target (@TARGETS_BUILT) { $BUILT{$target} = 1; }
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return defined $NAME_MAP{$ARCH} && defined $BUILT{$ARCH};
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}
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# Find a working subclass of ExecutionEngine for this platform.
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sub find_best_engine {
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if (have_native_backend && $TARGET_HAS_JIT) {
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return ['jit', 'native'];
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} else {
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return ['interpreter'];
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}
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}
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# Get all the human-friendly component names.
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sub name_map_entries {
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load_dependencies;
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return sort keys %NAME_MAP;
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}
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# Map human-readable names to internal library names.
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sub expand_names (@) {
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my @names = @_;
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my @result;
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foreach my $name (@names) {
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if (defined $LIB_TO_SET_MAP{$name}) {
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# We've hit bottom: An actual library name.
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push @result, $name;
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} elsif (defined $NAME_MAP{$name}) {
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# We've found a short name to expand.
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push @result, expand_names(@{$NAME_MAP{$name}});
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} else {
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print STDERR "llvm-config: unknown component name: $name\n";
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exit(1);
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}
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}
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return @result;
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}
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# Given a list of internal library names, return all sets of libraries which
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# will need to be included by the linker (in no particular order).
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sub find_all_required_sets (@) {
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my @libs = @_;
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my %sets_added;
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my @result;
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find_all_required_sets_helper(\%sets_added, \@result, @libs);
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return @result;
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}
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# Recursive closures are pretty broken in Perl, so we're going to separate
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# this function from find_all_required_sets and pass in the state we need
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# manually, as references. Yes, this is fairly unpleasant.
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sub find_all_required_sets_helper ($$@) {
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my ($sets_added, $result, @libs) = @_;
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foreach my $lib (@libs) {
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my $set = $LIB_TO_SET_MAP{$lib};
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next if defined $$sets_added{$set};
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$$sets_added{$set} = 1;
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push @$result, $set;
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find_all_required_sets_helper($sets_added, $result, @{$SET_DEPS{$set}});
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}
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}
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# Print a list of sets, with a label. Used for debugging.
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sub print_sets ($@) {
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my ($label, @sets) = @_;
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my @output;
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foreach my $set (@sets) { push @output, join(',', @$set); }
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print "$label: ", join(';', @output), "\n";
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}
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# Returns true if $lib is a key in $added.
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sub has_lib_been_added ($$) {
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my ($added, $lib) = @_;
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return defined $$added{$LIB_TO_SET_MAP{$lib}};
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}
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# Returns true if all the dependencies of $set appear in $added.
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sub have_all_deps_been_added ($$) {
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my ($added, $set) = @_;
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#print_sets(" Checking", $set);
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#print_sets(" Wants", $SET_DEPS{$set});
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foreach my $lib (@{$SET_DEPS{$set}}) {
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return 0 unless has_lib_been_added($added, $lib);
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}
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return 1;
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}
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# Given a list of sets, topologically sort them using dependencies.
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sub topologically_sort_sets (@) {
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my @sets = @_;
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my %added;
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my @result;
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SCAN: while (@sets) { # We'll delete items from @sets as we go.
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#print_sets("So far", reverse(@result));
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#print_sets("Remaining", @sets);
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for (my $i = 0; $i < @sets; ++$i) {
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my $set = $sets[$i];
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if (have_all_deps_been_added(\%added, $set)) {
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push @result, $set;
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$added{$set} = 1;
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#print "Removing $i.\n";
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splice(@sets, $i, 1);
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next SCAN; # Restart our scan.
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}
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}
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die "Can't find a library with no dependencies";
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}
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return reverse(@result);
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}
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# Our library dependency data will be added after the '__END__' token, and will
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# be read through the magic <DATA> filehandle.
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__END__
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