llvm-config: Replace with C++ version (was llvm-config-2).

   - Another reapply of r144300, with hopefully one last fix.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145623 91177308-0d34-0410-b5e6-96231b3b80d8

6 files changed, 415 insertions, 824 deletions

diff --git a/tools/llvm-config/BuildVariables.inc.in b/tools/llvm-config/BuildVariables.inc.in
index e69de29bb2..5969772c9d 100644
--- a/tools/llvm-config/BuildVariables.inc.in
+++ b/tools/llvm-config/BuildVariables.inc.in
@@ -0,0 +1,26 @@
+//===-- BuildVariables.inc.in - llvm-config build variables -*- C++ -*-----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is configured by the build system to define the variables
+// llvm-config wants to report to the user, but which can only be determined at
+// build time.
+//
+// The non .in variant of this file has been autogenerated by the LLVM build. Do
+// not edit!
+//
+//===----------------------------------------------------------------------===//
+
+#define LLVM_SRC_ROOT "@LLVM_SRC_ROOT@"
+#define LLVM_OBJ_ROOT "@LLVM_OBJ_ROOT@"
+#define LLVM_CPPFLAGS "@LLVM_CPPFLAGS@"
+#define LLVM_CFLAGS "@LLVM_CFLAGS@"
+#define LLVM_LDFLAGS "@LLVM_LDFLAGS@"
+#define LLVM_CXXFLAGS "@LLVM_CXXFLAGS@"
+#define LLVM_BUILDMODE "@LLVM_BUILDMODE@"
+#define LLVM_SYSTEM_LIBS "@LLVM_SYSTEM_LIBS@"
diff --git a/tools/llvm-config/CMakeLists.txt b/tools/llvm-config/CMakeLists.txt
index 53f00846b7..ed26ba9555 100644
--- a/tools/llvm-config/CMakeLists.txt
+++ b/tools/llvm-config/CMakeLists.txt
@@ -1,138 +1,41 @@
-include(TestBigEndian)
+set(LLVM_LINK_COMPONENTS support)
 
-include(FindPerl)
-if( NOT PERL_FOUND )
-  message(FATAL_ERROR "Perl required but not found!")
-endif( NOT PERL_FOUND )
-
-set(PERL ${PERL_EXECUTABLE})
-set(VERSION PACKAGE_VERSION)
-set(PREFIX ${CMAKE_INSTALL_PREFIX})
-set(abs_top_srcdir ${LLVM_MAIN_SRC_DIR})
-set(abs_top_builddir ${LLVM_BINARY_DIR})
-execute_process(COMMAND date
-  OUTPUT_VARIABLE LLVM_CONFIGTIME
-  OUTPUT_STRIP_TRAILING_WHITESPACE)
-# LLVM_ON_UNIX and LLVM_ON_WIN32 already set.
-# those are set to blank by `autoconf' on MinGW, so it seems they are not required:
-#set(LLVMGCCDIR "")
-#set(LLVMGCC "")
-#set(LLVMGXX "")
-test_big_endian(IS_BIG_ENDIAN)
-if( IS_BIG_ENDIAN )
-  set(ENDIAN "big")
-else( IS_BIG_ENDIAN )
-  set(ENDIAN "little")
-endif( IS_BIG_ENDIAN )
-set(SHLIBEXT ${LTDL_SHLIB_EXT})
-#EXEEXT already set.
-set(OS "${CMAKE_SYSTEM}")
-set(target "${TARGET_TRIPLE}")
-set(ARCH "${LLVM_NATIVE_ARCH}")
+# We need to generate the BuildVariables.inc file containing values which are
+# only defined when under certain build modes. Unfortunately, that precludes
+# doing this inside CMake so we have to shell out to sed. For now, that means we
+# can't expect to build llvm-config on Window.s
+set(BUILDVARIABLES_SRCPATH ${CMAKE_CURRENT_SOURCE_DIR}/BuildVariables.inc.in)
+set(BUILDVARIABLES_OBJPATH ${CMAKE_CURRENT_BINARY_DIR}/BuildVariables.inc)
+set(SEDSCRIPT_OBJPATH ${CMAKE_CURRENT_BINARY_DIR}/BuildVariables.configure.sed)
 
+# Compute the substitution values for various items.
 get_system_libs(LLVM_SYSTEM_LIBS_LIST)
 foreach(l ${LLVM_SYSTEM_LIBS_LIST})
-  set(LLVM_SYSTEM_LIBS ${LLVM_SYSTEM_LIBS} "-l${l}")
+  set(SYSTEM_LIBS ${SYSTEM_LIBS} "-l${l}")
 endforeach()
-
-foreach(c ${LLVM_TARGETS_TO_BUILD})
-  set(TARGETS_BUILT "${TARGETS_BUILT} ${c}")
-endforeach(c)
-set(TARGETS_TO_BUILD ${TARGETS_BUILT})
-set(TARGET_HAS_JIT "1")  # TODO
-
-# Avoids replacement at config-time:
-set(LLVM_CPPFLAGS "@LLVM_CPPFLAGS@")
-set(LLVM_CFLAGS "@LLVM_CFLAGS@")
-set(LLVM_CXXFLAGS "@LLVM_CXXFLAGS@")
-set(LLVM_LDFLAGS "@LLVM_LDFLAGS@")
-set(LIBS "@LIBS@")
-set(LLVM_BUILDMODE "@LLVM_BUILDMODE@")
-set(LLVM_OBJ_SUFFIX "@LLVM_OBJ_SUFFIX@")
-
-configure_file(
-  ${CMAKE_CURRENT_SOURCE_DIR}/llvm-config.in.in
-  ${CMAKE_CURRENT_BINARY_DIR}/llvm-config.in
-  @ONLY
-)
-
-set(LIBDEPS LibDeps.txt)
-set(LIBDEPS_TMP LibDeps.txt.tmp)
-set(FINAL_LIBDEPS FinalLibDeps.txt)
-set(LLVM_CONFIG ${LLVM_TOOLS_BINARY_DIR}/llvm-config)
-set(LLVM_CONFIG_IN ${CMAKE_CURRENT_BINARY_DIR}/llvm-config.in)
-
-if( CMAKE_CROSSCOMPILING )
-  set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)
-endif()
-
-find_program(NM_PATH nm PATH_SUFFIXES /bin)
-
-if( NOT NM_PATH )
-  message(FATAL_ERROR "`nm' not found")
-endif()
-
-get_property(llvm_libs GLOBAL PROPERTY LLVM_LIBS)
-
-add_custom_command(OUTPUT ${LIBDEPS_TMP}
-  COMMAND ${PERL_EXECUTABLE} ${LLVM_MAIN_SRC_DIR}/utils/GenLibDeps.pl -flat ${CMAKE_ARCHIVE_OUTPUT_DIRECTORY}/${CMAKE_CFG_INTDIR} ${NM_PATH} > ${LIBDEPS_TMP}
-  DEPENDS ${llvm_libs}
-  COMMENT "Regenerating ${LIBDEPS_TMP}")
-
-add_custom_command(OUTPUT ${LIBDEPS}
-  COMMAND ${CMAKE_COMMAND} -E copy_if_different ${LIBDEPS_TMP} ${LIBDEPS}
-  DEPENDS ${LIBDEPS_TMP}
-  COMMENT "Updating ${LIBDEPS} if necessary...")
-
-# This must stop the build if find-cycles.pl returns error:
-add_custom_command(OUTPUT ${FINAL_LIBDEPS}
-  COMMAND ${CMAKE_COMMAND} -E remove -f ${FINAL_LIBDEPS} ${FINAL_LIBDEPS}.tmp
-  COMMAND ${PERL_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/find-cycles.pl < ${LIBDEPS} > ${FINAL_LIBDEPS}.tmp
-  COMMAND ${CMAKE_COMMAND} -E copy ${FINAL_LIBDEPS}.tmp ${FINAL_LIBDEPS}
-  DEPENDS ${LIBDEPS}
-  COMMENT "Checking for cyclic dependencies between LLVM libraries.")
-
 set(C_FLGS "${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${LLVM_DEFINITIONS}")
 set(CXX_FLGS "${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${LLVM_DEFINITIONS}")
 set(CPP_FLGS "${CMAKE_CPP_FLAGS} ${CMAKE_CPP_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${LLVM_DEFINITIONS}")
 
-# We don't want certain flags on the output of
-# llvm-config --cflags --cxxflags
-macro(remove_option_from_llvm_config option)
-  llvm_replace_compiler_option(C_FLGS "${option}" "")
-  llvm_replace_compiler_option(CXX_FLGS "${option}" "")
-  llvm_replace_compiler_option(CPP_FLGS "${option}" "")
-endmacro(remove_option_from_llvm_config)
-remove_option_from_llvm_config("-pedantic")
-remove_option_from_llvm_config("-Wall")
-remove_option_from_llvm_config("-W")
-
-add_custom_command(OUTPUT ${LLVM_CONFIG}
-  COMMAND echo s!@LLVM_CPPFLAGS@!${CPP_FLGS}! > temp.sed
-  COMMAND echo s!@LLVM_CFLAGS@!${C_FLGS}! >> temp.sed
-  COMMAND echo s!@LLVM_CXXFLAGS@!${CXX_FLGS}! >> temp.sed
+add_custom_command(OUTPUT ${BUILDVARIABLES_OBJPATH}
+  COMMAND echo s!@LLVM_SRC_ROOT@!${LLVM_MAIN_SRC_DIR}! > ${SEDSCRIPT_OBJPATH}
+  COMMAND echo s!@LLVM_OBJ_ROOT@!${LLVM_BINARY_DIR}! >> ${SEDSCRIPT_OBJPATH}
+  COMMAND echo s!@LLVM_CPPFLAGS@!${CPP_FLGS}! >> ${SEDSCRIPT_OBJPATH}
+  COMMAND echo s!@LLVM_CFLAGS@!${C_FLGS}! >> ${SEDSCRIPT_OBJPATH}
+  COMMAND echo s!@LLVM_CXXFLAGS@!${CXX_FLGS}! >> ${SEDSCRIPT_OBJPATH}
   # TODO: Use general flags for linking! not just for shared libs:
-  COMMAND echo s!@LLVM_LDFLAGS@!${CMAKE_SHARED_LINKER_FLAGS}! >> temp.sed
-  COMMAND echo s!@LIBS@!${LLVM_SYSTEM_LIBS}! >> temp.sed
-  COMMAND echo s!@LLVM_BUILDMODE@!${CMAKE_BUILD_TYPE}! >> temp.sed
-  COMMAND echo s!@LLVM_OBJ_SUFFIX@!! >> temp.sed
-  COMMAND sed -f temp.sed < ${LLVM_CONFIG_IN} > ${LLVM_CONFIG}
-  COMMAND ${CMAKE_COMMAND} -E remove -f temp.sed
-  COMMAND cat ${FINAL_LIBDEPS} >> ${LLVM_CONFIG}
-  COMMAND chmod +x ${LLVM_CONFIG}
+  COMMAND echo s!@LLVM_LDFLAGS@!${CMAKE_SHARED_LINKER_FLAGS}! >> ${SEDSCRIPT_OBJPATH}
+  COMMAND echo s!@LLVM_BUILDMODE@!${CMAKE_BUILD_TYPE}! >> ${SEDSCRIPT_OBJPATH}
+  COMMAND echo s!@LLVM_SYSTEM_LIBS@!${SYSTEM_LIBS}! >> ${SEDSCRIPT_OBJPATH}
+  COMMAND sed -f ${SEDSCRIPT_OBJPATH} < ${BUILDVARIABLES_SRCPATH} > ${BUILDVARIABLES_OBJPATH}
   VERBATIM
-  DEPENDS ${FINAL_LIBDEPS} ${LLVM_CONFIG_IN}
-  COMMENT "Building llvm-config script."
+  COMMENT "Building BuildVariables.inc include."
   )
 
-add_custom_target(llvm-config.target ALL
-  DEPENDS ${LLVM_CONFIG})
-
-# Ensure we build llvm-config after we build all of the libraries so that we
-# have their full dependencies.
-add_dependencies(llvm-config.target ${llvm_libs})
+# Add the llvm-config tool.
+add_llvm_tool(llvm-config
+  llvm-config.cpp
+  )
 
-install(FILES ${LLVM_CONFIG}
-  PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE
-  WORLD_READ WORLD_EXECUTE
-  DESTINATION bin)
+# Add the dependency on the generation step.
+add_file_dependencies(${CMAKE_CURRENT_SOURCE_DIR}/llvm-config.cpp ${BUILDVARIABLES_OBJPATH})
diff --git a/tools/llvm-config/Makefile b/tools/llvm-config/Makefile
index 184919ea97..a7a2a63f99 100644
--- a/tools/llvm-config/Makefile
+++ b/tools/llvm-config/Makefile
@@ -1,5 +1,5 @@
-##===- tools/llvm-config/Makefile --------------------------*- Makefile -*-===##
-#
+##===- tools/llvm-config/Makefile---------------------------*- Makefile -*-===##
+# 
 #                     The LLVM Compiler Infrastructure
 #
 # This file is distributed under the University of Illinois Open Source
@@ -7,57 +7,42 @@
 # 
 ##===----------------------------------------------------------------------===##
 
-LEVEL = ../..
+LEVEL := ../..
+TOOLNAME := llvm-config
+USEDLIBS := LLVMSupport.a
 
-EXTRA_DIST = LibDeps.txt FinalLibDeps.txt llvm-config.in.in find-cycles.pl
+# We generate sources in the build directory, make sure it is in the include
+# paths.
+INCLUDE_BUILD_DIR := 1
 
-include $(LEVEL)/Makefile.common
+# This tool has no plugins, optimize startup time.
+TOOL_NO_EXPORTS := 1
 
-# If we don't have Perl, we can't generate the library dependencies upon which 
-# llvm-config depends. Therefore, only if we detect perl will we do anything
-# useful.
-ifeq ($(HAVE_PERL),1)
+# Note that we have to use lazy expansion here.
+BUILDVARIABLES_SRCPATH = $(PROJ_SRC_ROOT)/tools/$(TOOLNAME)/BuildVariables.inc.in
+BUILDVARIABLES_OBJPATH = $(ObjDir)/BuildVariables.inc
+BUILT_SOURCES = $(BUILDVARIABLES_OBJPATH)
+
+include $(LEVEL)/Makefile.common
 
 # Combine preprocessor flags (except for -I) and CXX flags.
-SUB_CPPFLAGS = ${CPP.BaseFlags}
-SUB_CFLAGS   = ${CPP.BaseFlags} ${C.Flags}
-SUB_CXXFLAGS = ${CPP.BaseFlags} ${CXX.Flags}
+SUB_CPPFLAGS := ${CPP.BaseFlags}
+SUB_CFLAGS   := ${CPP.BaseFlags} ${C.Flags}
+SUB_CXXFLAGS := ${CPP.BaseFlags} ${CXX.Flags}
 
 # This is blank for now.  We need to be careful about adding stuff here:
 # LDFLAGS tend not to be portable, and we don't currently require the
 # user to use libtool when linking against LLVM.
-SUB_LDFLAGS = 
-
-FinalLibDeps = $(PROJ_OBJ_DIR)/FinalLibDeps.txt
-LibDeps      = $(PROJ_OBJ_DIR)/LibDeps.txt
-LibDepsTemp  = $(PROJ_OBJ_DIR)/LibDeps.txt.tmp
-GenLibDeps   = $(PROJ_SRC_ROOT)/utils/GenLibDeps.pl
-
-$(LibDepsTemp): $(GenLibDeps) $(LibDir) $(wildcard $(LibDir)/*.a $(LibDir)/*.o)
-	$(Echo) "Regenerating LibDeps.txt.tmp"
-	$(Verb) $(PERL) $(GenLibDeps) -flat $(LibDir) "$(NM_PATH)" > $(LibDepsTemp)
-
-$(LibDeps): $(LibDepsTemp)
-	$(Verb) $(CMP) -s $@ $< || ( $(CP) $< $@ && \
-	  $(EchoCmd) Updated LibDeps.txt because dependencies changed )
-
-# Find all the cyclic dependencies between various LLVM libraries, so we
-# don't have to process them at runtime.
-$(FinalLibDeps): find-cycles.pl $(LibDeps)
-	$(Echo) "Checking for cyclic dependencies between LLVM libraries."
-	$(Verb) $(PERL) $< < $(LibDeps) > $@ || rm -f $@
+SUB_LDFLAGS :=
 
-# Rerun our configure substitutions as needed.
-ConfigInIn = $(PROJ_SRC_DIR)/llvm-config.in.in
-llvm-config.in: $(ConfigInIn) $(ConfigStatusScript)
-	$(Verb) cd $(PROJ_OBJ_ROOT) ; \
-		$(ConfigStatusScript) tools/llvm-config/llvm-config.in
-
-# Build our final script.
-$(ToolDir)/llvm-config: llvm-config.in $(FinalLibDeps)
-	$(Echo) "Building llvm-config script."
-	$(Verb) $(ECHO) 's/@LLVM_CPPFLAGS@/$(subst /,\/,$(SUB_CPPFLAGS))/' \
+$(ObjDir)/BuildVariables.inc: $(BUILDVARIABLES_SRCPATH) Makefile $(ObjDir)/.dir
+	$(Echo) "Building llvm-config BuildVariables.inc file."
+	$(Verb) $(ECHO) 's/@LLVM_SRC_ROOT@/$(subst /,\/,$(LLVM_SRC_ROOT))/' \
 	  > temp.sed
+	$(Verb) $(ECHO) 's/@LLVM_OBJ_ROOT@/$(subst /,\/,$(LLVM_OBJ_ROOT))/' \
+	  >> temp.sed
+	$(Verb) $(ECHO) 's/@LLVM_CPPFLAGS@/$(subst /,\/,$(SUB_CPPFLAGS))/' \
+	  >> temp.sed
 	$(Verb) $(ECHO) 's/@LLVM_CFLAGS@/$(subst /,\/,$(SUB_CFLAGS))/' \
 	  >> temp.sed
 	$(Verb) $(ECHO) 's/@LLVM_CXXFLAGS@/$(subst /,\/,$(SUB_CXXFLAGS))/' \
@@ -66,28 +51,7 @@ $(ToolDir)/llvm-config: llvm-config.in $(FinalLibDeps)
 	  >> temp.sed
 	$(Verb) $(ECHO) 's/@LLVM_BUILDMODE@/$(subst /,\/,$(BuildMode))/' \
 	  >> temp.sed
-	$(Verb) $(ECHO) 's/@LLVM_OBJ_SUFFIX@/$(subst /,\/,/$(BuildMode))/' \
+	$(Verb) $(ECHO) 's/@LLVM_SYSTEM_LIBS@/$(subst /,\/,$(LIBS))/' \
 	  >> temp.sed
 	$(Verb) $(SED) -f temp.sed < $< > $@
 	$(Verb) $(RM) temp.sed
-	$(Verb) cat $(FinalLibDeps) >> $@
-	$(Verb) chmod +x $@
-
-else
-# We don't have perl, just generate a dummy llvm-config
-$(ToolDir)/llvm-config:
-	$(Echo) "Building place holder llvm-config script."
-	$(Verb) $(ECHO) 'echo llvm-config: Perl not found so llvm-config could not be generated' >> $@
-	$(Verb) chmod +x $@
-
-endif
-# Hook into the standard Makefile rules.
-all-local:: $(ToolDir)/llvm-config
-clean-local::
-	$(Verb) $(RM) -f $(ToolDir)/llvm-config llvm-config.in $(FinalLibDeps) \
-	  $(LibDeps) GenLibDeps.out
-install-local:: all-local
-	$(Echo) Installing llvm-config
-	$(Verb) $(MKDIR) $(DESTDIR)$(PROJ_bindir)
-	$(Verb) $(ScriptInstall) $(ToolDir)/llvm-config $(DESTDIR)$(PROJ_bindir)
-
diff --git a/tools/llvm-config/find-cycles.pl b/tools/llvm-config/find-cycles.pl
deleted file mode 100644
index 5cbf5b4b27..0000000000
--- a/tools/llvm-config/find-cycles.pl
+++ /dev/null
@@ -1,170 +0,0 @@
-#!/usr/bin/perl
-#
-# Program:  find-cycles.pl
-#
-# Synopsis: Given a list of possibly cyclic dependencies, merge all the
-#           cycles.  This makes it possible to topologically sort the
-#           dependencies between different parts of LLVM.
-#
-# Syntax:   find-cycles.pl < LibDeps.txt > FinalLibDeps.txt
-#
-# Input:    cycmem1: cycmem2 dep1 dep2
-#           cycmem2: cycmem1 dep3 dep4
-#           boring: dep4
-#
-# Output:   cycmem1 cycmem2: dep1 dep2 dep3 dep4
-#           boring: dep4
-#
-# This file was written by Eric Kidd, and is placed into the public domain.
-#
-
-use 5.006;
-use strict;
-use warnings;
-
-my %DEPS;
-my @CYCLES;
-sub find_all_cycles;
-
-# Read our dependency information.
-while (<>) {
-    chomp;
-    my ($module, $dependency_str) = /^\s*([^:]+):\s*(.*)\s*$/;
-    die "Malformed data: $_" unless defined $dependency_str;
-    my @dependencies = split(/ /, $dependency_str);
-    $DEPS{$module} = \@dependencies;
-}
-
-# Partition our raw dependencies into sets of cyclically-connected nodes.
-find_all_cycles();
-
-# Print out the finished cycles, with their dependencies.
-my @output;
-my $cycles_found = 0;
-foreach my $cycle (@CYCLES) {
-    my @modules = sort keys %{$cycle};
-
-    # Merge the dependencies of all modules in this cycle.
-    my %dependencies;
-    foreach my $module (@modules) {
-        @dependencies{@{$DEPS{$module}}} = 1;
-    }
-
-    # Prune the known cyclic dependencies.
-    foreach my $module (@modules) {
-        delete $dependencies{$module};
-    }
-
-    # Warn about possible linker problems.
-    my @archives = grep(/\.a$/, @modules);
-    if (@archives > 1) {
-        $cycles_found = $cycles_found + 1;
-        print STDERR "find-cycles.pl: Circular dependency between *.a files:\n";
-        print STDERR "find-cycles.pl:   ", join(' ', @archives), "\n";
-        push @modules, @archives; # WORKAROUND: Duplicate *.a files. Ick.
-    } elsif (@modules > 1) {
-        $cycles_found = $cycles_found + 1;
-        print STDERR "find-cycles.pl: Circular dependency between *.o files:\n";
-        print STDERR "find-cycles.pl:   ", join(' ', @modules), "\n";
-        push @modules, @modules; # WORKAROUND: Duplicate *.o files. Ick.
-    }
-
-    # Add to our output.  (@modules is already as sorted as we need it to be.)
-    push @output, (join(' ', @modules) . ': ' .
-                   join(' ', sort keys %dependencies) . "\n");
-}
-print sort @output;
-
-exit $cycles_found;
-
-#==========================================================================
-#  Depedency Cycle Support
-#==========================================================================
-#  For now, we have cycles in our dependency graph.  Ideally, each cycle
-#  would be collapsed down to a single *.a file, saving us all this work.
-#
-#  To understand this code, you'll need a working knowledge of Perl 5,
-#  and possibly some quality time with 'man perlref'.
-
-my %SEEN;
-my %CYCLES;
-sub find_cycles ($@);
-sub found_cycles ($@);
-
-sub find_all_cycles {
-    # Find all multi-item cycles.
-    my @modules = sort keys %DEPS;
-    foreach my $module (@modules) { find_cycles($module); }
-
-    # Build fake one-item "cycles" for the remaining modules, so we can
-    # treat them uniformly.
-    foreach my $module (@modules) {
-        unless (defined $CYCLES{$module}) {
-            my %cycle = ($module, 1);
-            $CYCLES{$module} = \%cycle;
-        }
-    }
-
-    # Find all our unique cycles.  We have to do this the hard way because
-    # we apparently can't store hash references as hash keys without making
-    # 'strict refs' sad.
-    my %seen;
-    foreach my $cycle (values %CYCLES) {
-        unless ($seen{$cycle}) {
-            $seen{$cycle} = 1;
-            push @CYCLES, $cycle;
-        }
-    }
-}
-
-# Walk through our graph depth-first (keeping a trail in @path), and report
-# any cycles we find.
-sub find_cycles ($@) {
-    my ($module, @path) = @_;
-    if (str_in_list($module, @path)) {
-        found_cycle($module, @path);
-    } else {
-        return if defined $SEEN{$module};
-        $SEEN{$module} = 1;
-        foreach my $dep (@{$DEPS{$module}}) {
-            find_cycles($dep, @path, $module);
-        }
-    }
-}
-
-# Give a cycle, attempt to merge it with pre-existing cycle data.
-sub found_cycle ($@) {
-    my ($module, @path) = @_;
-
-    # Pop any modules which aren't part of our cycle.
-    while ($path[0] ne $module) { shift @path; }
-    #print join("->", @path, $module) . "\n";
-
-    # Collect the modules in our cycle into a hash.
-    my %cycle;
-    foreach my $item (@path) {
-        $cycle{$item} = 1;
-        if (defined $CYCLES{$item}) {
-            # Looks like we intersect with an existing cycle, so merge
-            # all those in, too.
-            foreach my $old_item (keys %{$CYCLES{$item}}) {
-                $cycle{$old_item} = 1;
-            }
-        }
-    }
-
-    # Update our global cycle table.
-    my $cycle_ref = \%cycle;
-    foreach my $item (keys %cycle) {
-        $CYCLES{$item} = $cycle_ref;
-    }
-    #print join(":", sort keys %cycle) . "\n";
-}
-
-sub str_in_list ($@) {
-    my ($str, @list) = @_;
-    foreach my $item (@list) {
-        return 1 if ($item eq $str);
-    }
-    return 0;
-}
diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
index e69de29bb2..bf3357e9f2 100644
--- a/tools/llvm-config/llvm-config.cpp
+++ b/tools/llvm-config/llvm-config.cpp
@@ -0,0 +1,334 @@
+//===-- llvm-config.cpp - LLVM project configuration utility --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This tool encapsulates information about an LLVM project configuration for
+// use by other project's build environments (to determine installed path,
+// available features, required libraries, etc.).
+//
+// Note that although this tool *may* be used by some parts of LLVM's build
+// itself (i.e., the Makefiles use it to compute required libraries when linking
+// tools), this tool is primarily designed to support external projects.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Config/config.h"
+#include "llvm/Config/llvm-config.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cstdlib>
+#include <set>
+#include <vector>
+
+using namespace llvm;
+
+// Include the build time variables we can report to the user. This is generated
+// at build time from the BuildVariables.inc.in file by the build system.
+#include "BuildVariables.inc"
+
+// Include the component table. This creates an array of struct
+// AvailableComponent entries, which record the component name, library name,
+// and required components for all of the available libraries.
+//
+// Not all components define a library, we also use "library groups" as a way to
+// create entries for pseudo groups like x86 or all-targets.
+#include "LibraryDependencies.inc"
+
+/// \brief Traverse a single component adding to the topological ordering in
+/// \arg RequiredLibs.
+///
+/// \param Name - The component to traverse.
+/// \param ComponentMap - A prebuilt map of component names to descriptors.
+/// \param VisitedComponents [in] [out] - The set of already visited components.
+/// \param RequiredLibs [out] - The ordered list of required libraries.
+static void VisitComponent(StringRef Name,
+                           const StringMap<AvailableComponent*> &ComponentMap,
+                           std::set<AvailableComponent*> &VisitedComponents,
+                           std::vector<StringRef> &RequiredLibs) {
+  // Lookup the component.
+  AvailableComponent *AC = ComponentMap.lookup(Name);
+  assert(AC && "Invalid component name!");
+
+  // Add to the visited table.
+  if (!VisitedComponents.insert(AC).second) {
+    // We are done if the component has already been visited.
+    return;
+  }
+
+  // Otherwise, visit all the dependencies.
+  for (unsigned i = 0; AC->RequiredLibraries[i]; ++i) {
+    VisitComponent(AC->RequiredLibraries[i], ComponentMap, VisitedComponents,
+                   RequiredLibs);
+  }
+
+  // Add to the required library list.
+  if (AC->Library)
+    RequiredLibs.push_back(AC->Library);
+}
+
+/// \brief Compute the list of required libraries for a given list of
+/// components, in an order suitable for passing to a linker (that is, libraries
+/// appear prior to their dependencies).
+///
+/// \param Components - The names of the components to find libraries for.
+/// \param RequiredLibs [out] - On return, the ordered list of libraries that
+/// are required to link the given components.
+void ComputeLibsForComponents(const std::vector<StringRef> &Components,
+                              std::vector<StringRef> &RequiredLibs) {
+  std::set<AvailableComponent*> VisitedComponents;
+
+  // Build a map of component names to information.
+  StringMap<AvailableComponent*> ComponentMap;
+  for (unsigned i = 0; i != array_lengthof(AvailableComponents); ++i) {
+    AvailableComponent *AC = &AvailableComponents[i];
+    ComponentMap[AC->Name] = AC;
+  }
+
+  // Visit the components.
+  for (unsigned i = 0, e = Components.size(); i != e; ++i) {
+    // Users are allowed to provide mixed case component names.
+    std::string ComponentLower = Components[i].lower();
+
+    // Validate that the user supplied a valid component name.
+    if (!ComponentMap.count(ComponentLower)) {
+      llvm::errs() << "llvm-config: unknown component name: " << Components[i]
+                   << "\n";
+      exit(1);
+    }
+
+    VisitComponent(ComponentLower, ComponentMap, VisitedComponents,
+                   RequiredLibs);
+  }
+
+  // The list is now ordered with leafs first, we want the libraries to printed
+  // in the reverse order of dependency.
+  std::reverse(RequiredLibs.begin(), RequiredLibs.end());
+}
+
+/* *** */
+
+void usage() {
+  errs() << "\
+usage: llvm-config <OPTION>... [<COMPONENT>...]\n\
+\n\
+Get various configuration information needed to compile programs which use\n\
+LLVM.  Typically called from 'configure' scripts.  Examples:\n\
+  llvm-config --cxxflags\n\
+  llvm-config --ldflags\n\
+  llvm-config --libs engine bcreader scalaropts\n\
+\n\
+Options:\n\
+  --version         Print LLVM version.\n\
+  --prefix          Print the installation prefix.\n\
+  --src-root        Print the source root LLVM was built from.\n\
+  --obj-root        Print the object root used to build LLVM.\n\
+  --bindir          Directory containing LLVM executables.\n\
+  --includedir      Directory containing LLVM headers.\n\
+  --libdir          Directory containing LLVM libraries.\n\
+  --cppflags        C preprocessor flags for files that include LLVM headers.\n\
+  --cflags          C compiler flags for files that include LLVM headers.\n\
+  --cxxflags        C++ compiler flags for files that include LLVM headers.\n\
+  --ldflags         Print Linker flags.\n\
+  --libs            Libraries needed to link against LLVM components.\n\
+  --libnames        Bare library names for in-tree builds.\n\
+  --libfiles        Fully qualified library filenames for makefile depends.\n\
+  --components      List of all possible components.\n\
+  --targets-built   List of all targets currently built.\n\
+  --host-target     Target triple used to configure LLVM.\n\
+  --build-mode      Print build mode of LLVM tree (e.g. Debug or Release).\n\
+Typical components:\n\
+  all               All LLVM libraries (default).\n\
+  backend           Either a native backend or the C backend.\n\
+  engine            Either a native JIT or a bitcode interpreter.\n";
+  exit(1);
+}
+
+/// \brief Compute the path to the main executable.
+llvm::sys::Path GetExecutablePath(const char *Argv0) {
+  // This just needs to be some symbol in the binary; C++ doesn't
+  // allow taking the address of ::main however.
+  void *P = (void*) (intptr_t) GetExecutablePath;
+  return llvm::sys::Path::GetMainExecutable(Argv0, P);
+}
+
+int main(int argc, char **argv) {
+  std::vector<StringRef> Components;
+  bool PrintLibs = false, PrintLibNames = false, PrintLibFiles = false;
+  bool HasAnyOption = false;
+
+  // llvm-config is designed to support being run both from a development tree
+  // and from an installed path. We try and auto-detect which case we are in so
+  // that we can report the correct information when run from a development
+  // tree.
+  bool IsInDevelopmentTree, DevelopmentTreeLayoutIsCMakeStyle;
+  llvm::SmallString<256> CurrentPath(GetExecutablePath(argv[0]).str());
+  std::string CurrentExecPrefix;
+  std::string ActiveObjRoot;
+
+  // Create an absolute path, and pop up one directory (we expect to be inside a
+  // bin dir).
+  sys::fs::make_absolute(CurrentPath);
+  CurrentExecPrefix = sys::path::parent_path(
+    sys::path::parent_path(CurrentPath)).str();
+
+  // Check to see if we are inside a development tree by comparing to possible
+  // locations (prefix style or CMake style). This could be wrong in the face of
+  // symbolic links, but is good enough.
+  if (CurrentExecPrefix == std::string(LLVM_OBJ_ROOT) + "/" + LLVM_BUILDMODE) {
+    IsInDevelopmentTree = true;
+    DevelopmentTreeLayoutIsCMakeStyle = false;
+
+    // If we are in a development tree, then check if we are in a BuildTools
+    // directory. This indicates we are built for the build triple, but we
+    // always want to provide information for the host triple.
+    if (sys::path::filename(LLVM_OBJ_ROOT) == "BuildTools") {
+      ActiveObjRoot = sys::path::parent_path(LLVM_OBJ_ROOT);
+    } else {
+      ActiveObjRoot = LLVM_OBJ_ROOT;
+    }
+  } else if (CurrentExecPrefix == std::string(LLVM_OBJ_ROOT) + "/bin") {
+    IsInDevelopmentTree = true;
+    DevelopmentTreeLayoutIsCMakeStyle = true;
+    ActiveObjRoot = LLVM_OBJ_ROOT;
+  } else {
+    IsInDevelopmentTree = false;
+  }
+
+  // Compute various directory locations based on the derived location
+  // information.
+  std::string ActivePrefix, ActiveBinDir, ActiveIncludeDir, ActiveLibDir;
+  std::string ActiveIncludeOption;
+  if (IsInDevelopmentTree) {
+    ActiveIncludeDir = std::string(LLVM_SRC_ROOT) + "/include";
+    ActivePrefix = CurrentExecPrefix;
+
+    // CMake organizes the products differently than a normal prefix style
+    // layout.
+    if (DevelopmentTreeLayoutIsCMakeStyle) {
+      ActiveBinDir = ActiveObjRoot + "/bin/" + LLVM_BUILDMODE;
+      ActiveLibDir = ActiveObjRoot + "/lib/" + LLVM_BUILDMODE;
+    } else {
+      ActiveBinDir = ActiveObjRoot + "/" + LLVM_BUILDMODE + "/bin";
+      ActiveLibDir = ActiveObjRoot + "/" + LLVM_BUILDMODE + "/lib";
+    }
+
+    // We need to include files from both the source and object trees.
+    ActiveIncludeOption = ("-I" + ActiveIncludeDir + " " +
+                           "-I" + ActiveObjRoot + "/include");
+  } else {
+    ActivePrefix = CurrentExecPrefix;
+    ActiveIncludeDir = ActivePrefix + "/include";
+    ActiveBinDir = ActivePrefix + "/bin";
+    ActiveLibDir = ActivePrefix + "/lib";
+    ActiveIncludeOption = "-I" + ActiveIncludeDir;
+  }
+
+  raw_ostream &OS = outs();
+  for (int i = 1; i != argc; ++i) {
+    StringRef Arg = argv[i];
+
+    if (Arg.startswith("-")) {
+      HasAnyOption = true;
+      if (Arg == "--version") {
+        OS << PACKAGE_VERSION << '\n';
+      } else if (Arg == "--prefix") {
+        OS << ActivePrefix << '\n';
+      } else if (Arg == "--bindir") {
+        OS << ActiveBinDir << '\n';
+      } else if (Arg == "--includedir") {
+        OS << ActiveIncludeDir << '\n';
+      } else if (Arg == "--libdir") {
+        OS << ActiveLibDir << '\n';
+      } else if (Arg == "--cppflags") {
+        OS << ActiveIncludeOption << ' ' << LLVM_CPPFLAGS << '\n';
+      } else if (Arg == "--cflags") {
+        OS << ActiveIncludeOption << ' ' << LLVM_CFLAGS << '\n';
+      } else if (Arg == "--cxxflags") {
+        OS << ActiveIncludeOption << ' ' << LLVM_CXXFLAGS << '\n';
+      } else if (Arg == "--ldflags") {
+        OS << "-L" << ActiveLibDir << ' ' << LLVM_LDFLAGS
+           << ' ' << LLVM_SYSTEM_LIBS << '\n';
+      } else if (Arg == "--libs") {
+        PrintLibs = true;
+      } else if (Arg == "--libnames") {
+        PrintLibNames = true;
+      } else if (Arg == "--libfiles") {
+        PrintLibFiles = true;
+      } else if (Arg == "--components") {
+        for (unsigned j = 0; j != array_lengthof(AvailableComponents); ++j) {
+          OS << ' ';
+          OS << AvailableComponents[j].Name;
+        }
+        OS << '\n';
+      } else if (Arg == "--targets-built") {
+        bool First = true;
+        for (TargetRegistry::iterator I = TargetRegistry::begin(),
+               E = TargetRegistry::end(); I != E; First = false, ++I) {
+          if (!First)
+            OS << ' ';
+          OS << I->getName();
+        }
+        OS << '\n';
+      } else if (Arg == "--host-target") {
+        OS << LLVM_DEFAULT_TARGET_TRIPLE << '\n';
+      } else if (Arg == "--build-mode") {
+        OS << LLVM_BUILDMODE << '\n';
+      } else if (Arg == "--obj-root") {
+        OS << LLVM_OBJ_ROOT << '\n';
+      } else if (Arg == "--src-root") {
+        OS << LLVM_SRC_ROOT << '\n';
+      } else {
+        usage();
+      }
+    } else {
+      Components.push_back(Arg);
+    }
+  }
+
+  if (!HasAnyOption)
+    usage();
+
+  if (PrintLibs || PrintLibNames || PrintLibFiles) {
+    // Construct the list of all the required libraries.
+    std::vector<StringRef> RequiredLibs;
+    ComputeLibsForComponents(Components, RequiredLibs);
+
+    for (unsigned i = 0, e = RequiredLibs.size(); i != e; ++i) {
+      StringRef Lib = RequiredLibs[i];
+      if (i)
+        OS << ' ';
+
+      if (PrintLibNames) {
+        OS << Lib;
+      } else if (PrintLibFiles) {
+        OS << ActiveLibDir << '/' << Lib;
+      } else if (PrintLibs) {
+        // If this is a typical library name, include it using -l.
+        if (Lib.startswith("lib") && Lib.endswith(".a")) {
+          OS << "-l" << Lib.slice(3, Lib.size()-2);
+          continue;
+        }
+
+        // Otherwise, print the full path.
+        OS << ActiveLibDir << '/' << Lib;
+      }
+    }
+    OS << '\n';
+  } else if (!Components.empty()) {
+    errs() << "llvm-config: error: components given, but unused\n\n";
+    usage();
+  }
+
+  return 0;
+}
diff --git a/tools/llvm-config/llvm-config.in.in b/tools/llvm-config/llvm-config.in.in
deleted file mode 100644
index d811e59abb..0000000000
--- a/tools/llvm-config/llvm-config.in.in
+++ /dev/null
@@ -1,466 +0,0 @@
-#!@PERL@
-##===- tools/llvm-config ---------------------------------------*- perl -*-===##
-# 
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-# 
-##===----------------------------------------------------------------------===##
-#
-# Synopsis: Prints out compiler options needed to build against an installed
-#           copy of LLVM.
-#
-# Syntax:   llvm-config OPTIONS... [COMPONENTS...]
-# 
-##===----------------------------------------------------------------------===##
-
-use 5.006;
-use strict;
-use warnings;
-use Cwd 'abs_path';
-
-#---- begin autoconf values ----
-my $PACKAGE_NAME        = q{@PACKAGE_NAME@};
-my $VERSION             = q{@PACKAGE_VERSION@};
-my $PREFIX              = q{@LLVM_PREFIX@};
-my $LLVM_CONFIGTIME     = q{@LLVM_CONFIGTIME@};
-my $LLVM_SRC_ROOT       = q{@abs_top_srcdir@};
-my $LLVM_OBJ_ROOT       = q{@abs_top_builddir@};
-my $ARCH                = lc(q{@ARCH@});
-my $TARGET_TRIPLE       = q{@target@};
-my $TARGETS_TO_BUILD    = q{@TARGETS_TO_BUILD@};
-my $TARGET_HAS_JIT      = q{@TARGET_HAS_JIT@};
-my @TARGETS_BUILT       = map { lc($_) } qw{@TARGETS_TO_BUILD@};
-#---- end autoconf values ----
-
-# Must pretend x86_64 architecture is really x86, otherwise the native backend
-# won't get linked in.
-$ARCH = "x86" if $ARCH eq "x86_64";
-
-#---- begin Makefile values ----
-my $CPPFLAGS            = q{@LLVM_CPPFLAGS@};
-my $CFLAGS              = q{@LLVM_CFLAGS@};
-my $CXXFLAGS            = q{@LLVM_CXXFLAGS@};
-my $LDFLAGS             = q{@LLVM_LDFLAGS@};
-my $SYSTEM_LIBS         = q{@LIBS@};
-my $LLVM_BUILDMODE      = q{@LLVM_BUILDMODE@};
-my $LLVM_OBJ_SUFFIX     = q{@LLVM_OBJ_SUFFIX@};
-#---- end Makefile values ----
-
-# Figure out where llvm-config is being run from.  Primarily, we care if it has
-# been installed, or is running from the build directory, which changes the
-# locations of some files.
-
-# Convert the current executable name into its directory (e.g. ".").
-my ($RUN_DIR) = ($0 =~ /^(.*)\/.*$/);
-
-# Turn the directory into an absolute directory on the file system, also pop up
-# from "bin" into the build or prefix dir.
-my $ABS_RUN_DIR = abs_path("$RUN_DIR/..");
-chomp($ABS_RUN_DIR);
-
-# Compute the absolute object directory build, e.g. "foo/llvm/Debug".
-my $ABS_OBJ_ROOT = "