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##===- tools/llvm-config ---------------------------------------*- perl -*-===##
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# The LLVM Compiler Infrastructure
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# This file is distributed under the University of Illinois Open Source
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# License. See LICENSE.TXT for details.
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##===----------------------------------------------------------------------===##
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# Synopsis: Prints out compiler options needed to build against an installed
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# Syntax: llvm-config OPTIONS... [COMPONENTS...]
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##===----------------------------------------------------------------------===##
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#---- begin autoconf values ----
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my $PACKAGE_NAME = q{@PACKAGE_NAME@};
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my $VERSION = q{@PACKAGE_VERSION@};
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my $PREFIX = q{@LLVM_PREFIX@};
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my $LLVM_CONFIGTIME = q{@LLVM_CONFIGTIME@};
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my $LLVM_SRC_ROOT = q{@abs_top_srcdir@};
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my $LLVM_OBJ_ROOT = q{@abs_top_builddir@};
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my $ARCH = lc(q{@ARCH@});
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my $TARGET_TRIPLE = q{@target@};
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my $TARGETS_TO_BUILD = q{@TARGETS_TO_BUILD@};
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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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# Must pretend x86_64 architecture is really x86, otherwise the native backend
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# won't get linked in.
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$ARCH = "x86" if $ARCH eq "x86_64";
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#---- begin Makefile values ----
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my $CPPFLAGS = q{@LLVM_CPPFLAGS@};
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my $CFLAGS = q{@LLVM_CFLAGS@};
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my $CXXFLAGS = q{@LLVM_CXXFLAGS@};
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my $LDFLAGS = q{@LLVM_LDFLAGS@};
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my $SYSTEM_LIBS = q{@LIBS@};
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my $LLVM_BUILDMODE = q{@LLVM_BUILDMODE@};
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#---- end Makefile values ----
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# Figure out where llvm-config is being run from. Primarily, we care if it has
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# been installed, or is running from the build directory, which changes the
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# locations of some files.
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# Convert the current executable name into its directory (e.g. ".").
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my ($RUN_DIR) = ($0 =~ /^(.*)\/.*$/);
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# Turn the directory into an absolute directory on the file system, also pop up
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# from "bin" into the build or prefix dir.
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my $ABS_RUN_DIR = abs_path("$RUN_DIR/..");
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# Compute the absolute object directory build, e.g. "foo/llvm/Debug".
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my $ABS_OBJ_ROOT = "$LLVM_OBJ_ROOT/$LLVM_BUILDMODE";
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$ABS_OBJ_ROOT = abs_path("$ABS_OBJ_ROOT") if (-d $ABS_OBJ_ROOT);
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my $INCLUDEDIR = "$ABS_RUN_DIR/include";
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my $INCLUDEOPTION = "-I$INCLUDEDIR";
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my $LIBDIR = "$ABS_RUN_DIR/lib";
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my $BINDIR = "$ABS_RUN_DIR/bin";
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if ($ABS_RUN_DIR eq $ABS_OBJ_ROOT) {
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# If we are running out of the build directory, the include dir is in the
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$INCLUDEDIR = "$LLVM_SRC_ROOT/include";
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# We need include files from both the srcdir and objdir.
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$INCLUDEOPTION = "-I$INCLUDEDIR -I$LLVM_OBJ_ROOT/include"
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# If installed, ignore the prefix the tree was configured with, use the
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$PREFIX = $ABS_RUN_DIR;
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sub fix_library_names (@);
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sub fix_library_files (@);
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sub expand_dependencies (@);
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# Parse our command-line arguments.
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my $want_libnames = 0;
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my $want_libfiles = 0;
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my $want_components = 0;
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foreach my $arg (@ARGV) {
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if ($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 ($arg eq "--cppflags") {
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$has_opt = 1; print "$INCLUDEOPTION $CPPFLAGS\n";
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} elsif ($arg eq "--cflags") {
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$has_opt = 1; print "$INCLUDEOPTION $CFLAGS\n";
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} elsif ($arg eq "--cxxflags") {
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$has_opt = 1; print "$INCLUDEOPTION $CXXFLAGS\n";
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} elsif ($arg eq "--ldflags") {
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$has_opt = 1; print "-L$LIBDIR $LDFLAGS $SYSTEM_LIBS\n";
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} elsif ($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 "--libfiles") {
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$has_opt = 1; $want_libfiles = 1;
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} elsif ($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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$has_opt = 1; print join(' ', @TARGETS_BUILT), "\n";
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} elsif ($arg eq "--host-target") {
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$has_opt = 1; print "$TARGET_TRIPLE\n";
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} elsif ($arg eq "--build-mode") {
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$has_opt = 1; print "$LLVM_BUILDMODE\n";
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} elsif ($arg eq "--obj-root") {
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$has_opt = 1; print abs_path("$LLVM_OBJ_ROOT/");
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} elsif ($arg eq "--src-root") {
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$has_opt = 1; print abs_path("$LLVM_SRC_ROOT/");
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push @components, $arg;
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# If no options were specified, fail.
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usage unless $has_opt;
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# If no components were specified, default to 'all'.
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if (@components == 0) {
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push @components, 'all';
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# Force component names to lower case.
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@components = map lc, @components;
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# Handle any arguments which require building our dependency graph.
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if ($want_libs || $want_libnames || $want_libfiles) {
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my @libs = expand_dependencies(@components);
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print join(' ', fix_library_names(@libs)), "\n" if ($want_libs);
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print join(' ', @libs), "\n" if ($want_libnames);
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print join(' ', fix_library_files(@libs)), "\n" if ($want_libfiles);
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#==========================================================================
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#==========================================================================
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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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--version Print LLVM version.
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--prefix Print the installation prefix.
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--src-root Print the source root LLVM was built from.
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--obj-root Print the object root used to build LLVM.
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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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--cppflags C preprocessor flags for files that include LLVM headers.
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--cflags C compiler flags for files that include LLVM headers.
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--cxxflags C++ compiler flags for files that include LLVM headers.
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--ldflags Print 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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--libfiles Fully qualified library filenames for makefile depends.
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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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--host-target Target triple used to configure LLVM.
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--build-mode Print build mode of LLVM tree (e.g. Debug or Release).
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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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# 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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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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push @result, "$LIBDIR/$lib";
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# Turn the list of libraries into a list of files.
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sub fix_library_files(@) {
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foreach my $lib (@libs) {
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# Transform the bare library name into a filename.
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push @result, "$LIBDIR/$lib";
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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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# 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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# 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 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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# 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_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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foreach my $set (@sorted_sets) { push @result, @{$set}; }
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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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my ($libs, $deps) = /^\s*([^:]+):\s*(.*)\s*$/;
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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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foreach my $lib (@libs) { $LIB_TO_SET_MAP{$lib} = $set; }
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$SET_DEPS{$set} = \@deps;
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# Build a map converting human-friendly component names into internal
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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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# Add target-specific entries
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foreach my $target (@TARGETS_BUILT) {
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# FIXME: Temporary, until we don't switch all targets
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if (defined $NAME_MAP{$target.'asmprinter'}) {
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$NAME_MAP{$target} = [$target.'info',
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$target.'asmprinter',
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$NAME_MAP{$target} = [$target.'info',
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$NAME_MAP{$target}[0]]
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if (defined $NAME_MAP{$target.'asmparser'}) {
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push @{$NAME_MAP{$target}},$target.'asmparser'
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if (defined $NAME_MAP{$target.'disassembler'}) {
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push @{$NAME_MAP{$target}},$target.'disassembler'
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# Add virtual entries.
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$NAME_MAP{'native'} = have_native_backend() ? [$ARCH] : [];
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$NAME_MAP{'nativecodegen'} = have_native_backend() ? [$ARCH.'codegen'] : [];
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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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# Return true if we have a native backend to use.
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sub have_native_backend {
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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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# 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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return ['interpreter'];
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# Get all the human-friendly component names.
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sub name_map_entries {
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return sort keys %NAME_MAP;
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# Map human-readable names to internal library names.
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sub expand_names (@) {
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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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} 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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print STDERR "llvm-config: unknown component name: $name\n";
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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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find_all_required_sets_helper(\%sets_added, \@result, @libs);
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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{$set} = 1;
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find_all_required_sets_helper($sets_added, $result, @{$SET_DEPS{$set}});
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# Print a list of sets, with a label. Used for debugging.
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sub print_sets ($@) {
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my ($label, @sets) = @_;
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foreach my $set (@sets) { push @output, join(',', @$set); }
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print "$label: ", join(';', @output), "\n";
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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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# 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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# Given a list of sets, topologically sort them using dependencies.
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sub topologically_sort_sets (@) {
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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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if (have_all_deps_been_added(\%added, $set)) {
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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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die "Can't find a library with no dependencies";
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return reverse(@result);
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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.
added
removed
libclamav/c++/llvm/tools/llvm-config/llvm-config.in.in
