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# Find the native LLVM includes and libraries
#
# Defines the following variables
# LLVM_INCLUDE_DIRS - where to find llvm include files
# LLVM_LIBRARY_DIRS - where to find llvm libs
# LLVM_CFLAGS - llvm compiler flags
# LLVM_LFLAGS - llvm linker flags
# LLVM_MODULE_LIBS - list of llvm libs for working with modules.
# LLVM_INSTALL_PREFIX - LLVM installation prefix
# LLVM_FOUND - True if llvm found.
# LLVM_VERSION - Version string ("llvm-config --version")
#
# This module reads hints about search locations from variables
# LLVM_ROOT - Preferred LLVM installation prefix (containing bin/, lib/, ...)
#
# Note: One may specify these as environment variables if they are not specified as
# CMake variables or cache entries.
#=============================================================================
# SPDX-FileCopyrightText: 2014 Kevin Funk <kfunk@kde.org>
#
# SPDX-License-Identifier: BSD-2-Clause
#=============================================================================
if (NOT LLVM_ROOT AND DEFINED ENV{LLVM_ROOT})
file(TO_CMAKE_PATH "$ENV{LLVM_ROOT}" LLVM_ROOT)
endif()
# if the user specified LLVM_ROOT, use that and fail otherwise
if (LLVM_ROOT)
find_program(LLVM_CONFIG_EXECUTABLE NAMES llvm-config HINTS ${LLVM_ROOT}/bin DOC "llvm-config executable" NO_DEFAULT_PATH)
else()
# find llvm-config, prefer the one with a version suffix, e.g. llvm-config-3.5
# note: FreeBSD installs llvm-config as llvm-config35 and so on
# note: on some distributions, only 'llvm-config' is shipped, so let's always try to fallback on that
string(REPLACE "." "" LLVM_FIND_VERSION_CONCAT ${LLVM_FIND_VERSION})
find_program(LLVM_CONFIG_EXECUTABLE NAMES llvm-config-${LLVM_FIND_VERSION} llvm-config${LLVM_FIND_VERSION_CONCAT} llvm-config DOC "llvm-config executable")
# other distributions don't ship llvm-config, but only some llvm-config-VERSION binary
# try to deduce installed LLVM version by looking up llvm-nm in PATH and *then* find llvm-config-VERSION via that
if (NOT LLVM_CONFIG_EXECUTABLE)
find_program(_llvmNmExecutable llvm-nm)
if (_llvmNmExecutable)
execute_process(COMMAND ${_llvmNmExecutable} --version OUTPUT_VARIABLE _out)
string(REGEX REPLACE ".*LLVM version ([^ \n]+).*" "\\1" _versionString "${_out}")
find_program(LLVM_CONFIG_EXECUTABLE NAMES llvm-config-${_versionString} DOC "llvm-config executable")
endif()
endif()
endif()
set(LLVM_FOUND FALSE)
if (LLVM_CONFIG_EXECUTABLE)
# verify that we've found the correct version of llvm-config
execute_process(COMMAND ${LLVM_CONFIG_EXECUTABLE} --version
OUTPUT_VARIABLE LLVM_VERSION
OUTPUT_STRIP_TRAILING_WHITESPACE)
if (NOT LLVM_VERSION)
set(_LLVM_ERROR_MESSAGE "Failed to parse version from llvm-config")
elseif (LLVM_FIND_VERSION VERSION_GREATER LLVM_VERSION)
set(_LLVM_ERROR_MESSAGE "LLVM version too old: ${LLVM_VERSION}")
else()
set(LLVM_FOUND TRUE)
endif()
else()
set(_LLVM_ERROR_MESSAGE "Could NOT find 'llvm-config' executable")
endif()
if (LLVM_FOUND)
execute_process(
COMMAND ${LLVM_CONFIG_EXECUTABLE} --includedir
OUTPUT_VARIABLE LLVM_INCLUDE_DIRS
OUTPUT_STRIP_TRAILING_WHITESPACE
)
execute_process(
COMMAND ${LLVM_CONFIG_EXECUTABLE} --libdir
OUTPUT_VARIABLE LLVM_LIBRARY_DIRS
OUTPUT_STRIP_TRAILING_WHITESPACE
)
execute_process(
COMMAND ${LLVM_CONFIG_EXECUTABLE} --cppflags
OUTPUT_VARIABLE LLVM_CFLAGS
OUTPUT_STRIP_TRAILING_WHITESPACE
)
execute_process(
COMMAND ${LLVM_CONFIG_EXECUTABLE} --ldflags
OUTPUT_VARIABLE LLVM_LFLAGS
OUTPUT_STRIP_TRAILING_WHITESPACE
)
execute_process(
COMMAND ${LLVM_CONFIG_EXECUTABLE} --libs core bitreader asmparser analysis
OUTPUT_VARIABLE LLVM_MODULE_LIBS
OUTPUT_STRIP_TRAILING_WHITESPACE
)
execute_process(
COMMAND ${LLVM_CONFIG_EXECUTABLE} --libfiles
OUTPUT_VARIABLE LLVM_LIBS
OUTPUT_STRIP_TRAILING_WHITESPACE
)
string(REPLACE " " ";" LLVM_LIBS ${LLVM_LIBS}) # Make it consistent with --libs
execute_process(
COMMAND ${LLVM_CONFIG_EXECUTABLE} --system-libs
OUTPUT_VARIABLE LLVM_SYSTEM_LIBS
OUTPUT_STRIP_TRAILING_WHITESPACE
)
execute_process(
COMMAND ${LLVM_CONFIG_EXECUTABLE} --prefix
OUTPUT_VARIABLE LLVM_INSTALL_PREFIX
OUTPUT_STRIP_TRAILING_WHITESPACE
)
# potentially add include dir from binary dir for non-installed LLVM
execute_process(
COMMAND ${LLVM_CONFIG_EXECUTABLE} --src-root
OUTPUT_VARIABLE _llvmSourceRoot
OUTPUT_STRIP_TRAILING_WHITESPACE
)
string(FIND "${LLVM_INCLUDE_DIRS}" "${_llvmSourceRoot}" _llvmIsInstalled)
if (NOT _llvmIsInstalled)
list(APPEND LLVM_INCLUDE_DIRS "${LLVM_INSTALL_PREFIX}/include")
endif()
endif()
if (LLVM_FIND_REQUIRED AND NOT LLVM_FOUND)
message(FATAL_ERROR "Could not find LLVM: ${_LLVM_ERROR_MESSAGE}")
elseif(_LLVM_ERROR_MESSAGE)
message(STATUS "Could not find LLVM: ${_LLVM_ERROR_MESSAGE}")
endif()
if (LLVM_FOUND)
message(STATUS "Found LLVM (version: ${LLVM_VERSION}): (using ${LLVM_CONFIG_EXECUTABLE})")
message(STATUS " Include dirs: ${LLVM_INCLUDE_DIRS}")
message(STATUS " LLVM libraries: ${LLVM_LIBS}")
message(STATUS " LLVM System libraries: ${LLVM_SYSTEM_LIBS}")
endif()
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