Provide CMake package modules in install tree

Teach the Makefile build system to generate and install CMake modules
LLVMConfig.cmake and LLVMConfigVersion.cmake so that applications that
build with CMake can use 'find_package(LLVM)' even when LLVM is not
built with CMake.  These modules tell such applications about available
LLVM libraries and their dependencies.

Run llvm-config to generate the list of libraries and use the results of
llvm-build to generate the library dependencies.  Use sed to perform
substitutions in the LLVMConfig.cmake.in and LLVMConfigVersion.cmake.in
sources that our CMake build system uses.

Teach the Makefile build system to generate the LLVMExports.cmake file
with content similar to that produced by the CMake install(EXPORT)
command.  Extend llvm-build with an option to generate the library
dependencies fragment for this file.

Contributed by Brad King.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201053 91177308-0d34-0410-b5e6-96231b3b80d8

cmake/modules/Makefile

@@ -0,0 +1,106 @@
+##===- cmake/modules/Makefile ------------------------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../..
+
+LINK_COMPONENTS := all
+
+include $(LEVEL)/Makefile.common
+
+PROJ_cmake := $(DESTDIR)$(PROJ_prefix)/share/llvm/cmake
+
+OBJMODS := LLVMConfig.cmake LLVMConfigVersion.cmake LLVMExports.cmake
+
+# TODO: Teach LLVM-Config.cmake to work without explicit terminfo libs.
+TERMINFO_LIBS := tinfo terminfo curses ncurses ncursesw
+TERMINFO_LIBS := $(filter $(TERMINFO_LIBS),$(subst -l,,$(LIBS)))
+
+$(PROJ_OBJ_DIR)/LLVMConfig.cmake: LLVMConfig.cmake.in $(LLVMBuildCMakeFrag)
+	$(Echo) 'Generating LLVM CMake package config file'
+	$(Verb) ( \
+	 cat $< | sed \
+	  -e 's/@LLVM_CONFIG_CODE@/set(LLVM_INSTALL_PREFIX "'"$(subst /,\/,$(PROJ_prefix))"'")/' \
+	  -e 's/@LLVM_VERSION_MAJOR@/'"$(LLVM_VERSION_MAJOR)"'/' \
+	  -e 's/@LLVM_VERSION_MINOR@/'"$(LLVM_VERSION_MINOR)"'/' \
+	  -e 's/@PACKAGE_VERSION@/'"$(LLVMVersion)"'/' \
+	  -e 's/@LLVM_COMMON_DEPENDS@//' \
+	  -e 's/"@llvm_libs@"/'"$(subst -l,,$(LLVMConfigLibs))"'/' \
+	  -e 's/@LLVM_ALL_TARGETS@/'"$(ALL_TARGETS)"'/' \
+	  -e 's/@LLVM_TARGETS_TO_BUILD@/'"$(TARGETS_TO_BUILD)"'/' \
+	  -e 's/@LLVM_TARGETS_WITH_JIT@/'"$(TARGETS_WITH_JIT)"'/' \
+	  -e 's/@TARGET_TRIPLE@/'"$(TARGET_TRIPLE)"'/' \
+	  -e 's/@LLVM_ENABLE_TERMINFO@/'"$(ENABLE_TERMINFO)"'/' \
+	  -e 's/@LLVM_ENABLE_THREADS@/'"$(ENABLE_THREADS)"'/' \
+	  -e 's/@LLVM_ENABLE_ZLIB@/'"$(ENABLE_ZLIB)"'/' \
+	  -e 's/@LLVM_NATIVE_ARCH@/'"$(LLVM_NATIVE_ARCH)"'/' \
+	  -e 's/@LLVM_ENABLE_PIC@/'"$(ENABLE_PIC)"'/' \
+	  -e 's/@HAVE_TERMINFO@/'"$(HAVE_TERMINFO)"'/' \
+	  -e 's/@TERMINFO_LIBS@/'"$(TERMINFO_LIBS)"'/' \
+	  -e 's/@HAVE_LIBDL@/'"$(HAVE_DLOPEN)"'/' \
+	  -e 's/@HAVE_LIBPTHREAD@/'"$(HAVE_PTHREAD)"'/' \
+	  -e 's/@HAVE_LIBZ@/'"$(HAVE_LIBZ)"'/' \
+	  -e 's/@LLVM_ON_UNIX@/'"$(LLVM_ON_UNIX)"'/' \
+	  -e 's/@LLVM_ON_WIN32@/'"$(LLVM_ON_WIN32)"'/' \
+	  -e 's/@LLVM_CONFIG_INCLUDE_DIRS@/'"$(subst /,\/,$(PROJ_includedir))"'/' \
+	  -e 's/@LLVM_CONFIG_LIBRARY_DIRS@/'"$(subst /,\/,$(PROJ_libdir))"'/' \
+	  -e 's/@LLVM_CONFIG_CMAKE_DIR@/'"$(subst /,\/,$(PROJ_cmake))"'/' \
+	  -e 's/@LLVM_CONFIG_EXPORTS_FILE@/$${LLVM_CMAKE_DIR}\/LLVMExports.cmake/' \
+	  -e 's/@all_llvm_lib_deps@//' \
+	 && \
+	 # TODO: Teach LLVM-Config.cmake to use builtin CMake features     \
+	 # for library dependencies.  For now add the generated fragments. \
+	 grep '^set_property.*LLVMBUILD_LIB_DEPS_' "$(LLVMBuildCMakeFrag)" \
+	) > $@
+
+$(PROJ_OBJ_DIR)/LLVMConfigVersion.cmake: LLVMConfigVersion.cmake.in
+	$(Echo) 'Generating LLVM CMake package version file'
+	$(Verb) cat $< | sed \
+	  -e 's/@PACKAGE_VERSION@/'"$(LLVMVersion)"'/' \
+	  > $@
+
+$(PROJ_OBJ_DIR)/LLVMExports.cmake: $(LLVMBuildCMakeExportsFrag)
+	$(Echo) 'Generating LLVM CMake target exports file'
+	$(Verb) ( \
+	  echo '# LLVM CMake target exports.  Do not include directly.' && \
+	  for lib in $(subst -l,,$(LLVMConfigLibs)); do \
+	    echo 'add_library('"$$lib"' STATIC IMPORTED)' && \
+	    echo 'set_property(TARGET '"$$lib"' PROPERTY IMPORTED_LOCATION "'"$(PROJ_libdir)/lib$$lib.a"'")' ; \
+	  done && \
+	  cat "$(LLVMBuildCMakeExportsFrag)" \
+	) > $@
+
+all-local:: $(addprefix $(PROJ_OBJ_DIR)/, $(OBJMODS))
+
+SKIPSRCMODS := \
+  CheckAtomic.cmake \
+  GetHostTriple.cmake \
+  LLVMBuildExports.cmake \
+  LLVMConfig.cmake \
+  LLVMConfigVersion.cmake \
+  LLVMExports.cmake \
+  VersionFromVCS.cmake
+
+SRCMODS := $(notdir $(wildcard $(PROJ_SRC_DIR)/*.cmake))
+SRCMODS := $(filter-out $(SKIPSRCMODS),$(SRCMODS))
+INSTSRCMODS := $(addprefix $(PROJ_cmake)/, $(SRCMODS))
+INSTOBJMODS := $(addprefix $(PROJ_cmake)/, $(OBJMODS))
+
+$(PROJ_cmake):
+	$(Echo) Making install directory: $@
+	$(Verb) $(MKDIR) $@
+
+$(INSTSRCMODS): $(PROJ_cmake)/%.cmake: $(PROJ_SRC_DIR)/%.cmake | $(PROJ_cmake)
+	$(Echo) Installing cmake modules: $(notdir $<)
+	$(Verb) $(DataInstall) $< $(PROJ_cmake)
+
+$(INSTOBJMODS): $(PROJ_cmake)/%.cmake: $(PROJ_OBJ_DIR)/%.cmake | $(PROJ_cmake)
+	$(Echo) Installing cmake modules: $(notdir $<)
+	$(Verb) $(DataInstall) $< $(PROJ_cmake)
+
+install-local:: $(INSTSRCMODS) $(INSTOBJMODS)