130 lines
5.3 KiB
CMake
130 lines
5.3 KiB
CMake
|
|
# determine the compiler to use for C programs
|
|
# NOTE, a generator may set CMAKE_C_COMPILER before
|
|
# loading this file to force a compiler.
|
|
# use environment variable CC first if defined by user, next use
|
|
# the cmake variable CMAKE_GENERATOR_CC which can be defined by a generator
|
|
# as a default compiler
|
|
# If the internal cmake variable _CMAKE_TOOLCHAIN_PREFIX is set, this is used
|
|
# as prefix for the tools (e.g. arm-elf-gcc, arm-elf-ar etc.). This works
|
|
# currently with the GNU crosscompilers.
|
|
#
|
|
# Sets the following variables:
|
|
# CMAKE_C_COMPILER
|
|
# CMAKE_AR
|
|
# CMAKE_RANLIB
|
|
# CMAKE_COMPILER_IS_GNUCC
|
|
#
|
|
# If not already set before, it also sets
|
|
# _CMAKE_TOOLCHAIN_PREFIX
|
|
|
|
IF(NOT CMAKE_C_COMPILER)
|
|
SET(CMAKE_CXX_COMPILER_INIT NOTFOUND)
|
|
|
|
# prefer the environment variable CC
|
|
IF($ENV{CC} MATCHES ".+")
|
|
GET_FILENAME_COMPONENT(CMAKE_C_COMPILER_INIT $ENV{CC} PROGRAM PROGRAM_ARGS CMAKE_C_FLAGS_ENV_INIT)
|
|
IF(CMAKE_C_FLAGS_ENV_INIT)
|
|
SET(CMAKE_C_COMPILER_ARG1 "${CMAKE_C_FLAGS_ENV_INIT}" CACHE STRING "First argument to C compiler")
|
|
ENDIF(CMAKE_C_FLAGS_ENV_INIT)
|
|
IF(NOT EXISTS ${CMAKE_C_COMPILER_INIT})
|
|
MESSAGE(FATAL_ERROR "Could not find compiler set in environment variable CC:\n$ENV{CC}.")
|
|
ENDIF(NOT EXISTS ${CMAKE_C_COMPILER_INIT})
|
|
ENDIF($ENV{CC} MATCHES ".+")
|
|
|
|
# next try prefer the compiler specified by the generator
|
|
IF(CMAKE_GENERATOR_CC)
|
|
IF(NOT CMAKE_C_COMPILER_INIT)
|
|
SET(CMAKE_C_COMPILER_INIT ${CMAKE_GENERATOR_CC})
|
|
ENDIF(NOT CMAKE_C_COMPILER_INIT)
|
|
ENDIF(CMAKE_GENERATOR_CC)
|
|
|
|
# finally list compilers to try
|
|
IF(CMAKE_C_COMPILER_INIT)
|
|
SET(CMAKE_C_COMPILER_LIST ${CMAKE_C_COMPILER_INIT})
|
|
ELSE(CMAKE_C_COMPILER_INIT)
|
|
SET(CMAKE_C_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}gcc ${_CMAKE_TOOLCHAIN_PREFIX}cc cl bcc xlc)
|
|
ENDIF(CMAKE_C_COMPILER_INIT)
|
|
|
|
# Find the compiler.
|
|
IF (_CMAKE_USER_CXX_COMPILER_PATH)
|
|
FIND_PROGRAM(CMAKE_C_COMPILER NAMES ${CMAKE_C_COMPILER_LIST} PATHS ${_CMAKE_USER_CXX_COMPILER_PATH} DOC "C compiler" NO_DEFAULT_PATH)
|
|
ENDIF (_CMAKE_USER_CXX_COMPILER_PATH)
|
|
FIND_PROGRAM(CMAKE_C_COMPILER NAMES ${CMAKE_C_COMPILER_LIST} DOC "C compiler")
|
|
|
|
IF(CMAKE_C_COMPILER_INIT AND NOT CMAKE_C_COMPILER)
|
|
SET(CMAKE_C_COMPILER "${CMAKE_C_COMPILER_INIT}" CACHE FILEPATH "C compiler" FORCE)
|
|
ENDIF(CMAKE_C_COMPILER_INIT AND NOT CMAKE_C_COMPILER)
|
|
ELSE(NOT CMAKE_C_COMPILER)
|
|
|
|
# we only get here if CMAKE_C_COMPILER was specified using -D or a pre-made CMakeCache.txt
|
|
# (e.g. via ctest) or set in CMAKE_TOOLCHAIN_FILE
|
|
#
|
|
# if a compiler was specified by the user but without path,
|
|
# now try to find it with the full path
|
|
# if it is found, force it into the cache,
|
|
# if not, don't overwrite the setting (which was given by the user) with "NOTFOUND"
|
|
# if the C compiler already had a path, reuse it for searching the CXX compiler
|
|
GET_FILENAME_COMPONENT(_CMAKE_USER_C_COMPILER_PATH "${CMAKE_C_COMPILER}" PATH)
|
|
IF(NOT _CMAKE_USER_C_COMPILER_PATH)
|
|
FIND_PROGRAM(CMAKE_C_COMPILER_WITH_PATH NAMES ${CMAKE_C_COMPILER})
|
|
MARK_AS_ADVANCED(CMAKE_C_COMPILER_WITH_PATH)
|
|
IF(CMAKE_C_COMPILER_WITH_PATH)
|
|
SET(CMAKE_C_COMPILER ${CMAKE_C_COMPILER_WITH_PATH} CACHE STRING "C compiler" FORCE)
|
|
ENDIF(CMAKE_C_COMPILER_WITH_PATH)
|
|
ENDIF(NOT _CMAKE_USER_C_COMPILER_PATH)
|
|
ENDIF(NOT CMAKE_C_COMPILER)
|
|
MARK_AS_ADVANCED(CMAKE_C_COMPILER)
|
|
|
|
IF (NOT _CMAKE_TOOLCHAIN_LOCATION)
|
|
GET_FILENAME_COMPONENT(_CMAKE_TOOLCHAIN_LOCATION "${CMAKE_C_COMPILER}" PATH)
|
|
ENDIF (NOT _CMAKE_TOOLCHAIN_LOCATION)
|
|
|
|
# if we have a gcc cross compiler, they have usually some prefix, like
|
|
# e.g. powerpc-linux-gcc, arm-elf-gcc or i586-mingw32msvc-gcc
|
|
# the other tools of the toolchain usually have the same prefix
|
|
IF (NOT _CMAKE_TOOLCHAIN_PREFIX)
|
|
GET_FILENAME_COMPONENT(COMPILER_BASENAME "${CMAKE_C_COMPILER}" NAME_WE)
|
|
IF (COMPILER_BASENAME MATCHES "^(.+-)g?cc")
|
|
STRING(REGEX REPLACE "^(.+-)g?cc" "\\1" _CMAKE_TOOLCHAIN_PREFIX "${COMPILER_BASENAME}")
|
|
ENDIF (COMPILER_BASENAME MATCHES "^(.+-)g?cc")
|
|
ENDIF (NOT _CMAKE_TOOLCHAIN_PREFIX)
|
|
|
|
|
|
# Build a small source file to identify the compiler.
|
|
IF(${CMAKE_GENERATOR} MATCHES "Visual Studio")
|
|
SET(CMAKE_C_COMPILER_ID_RUN 1)
|
|
SET(CMAKE_C_PLATFORM_ID "Windows")
|
|
|
|
# TODO: Set the compiler id. It is probably MSVC but
|
|
# the user may be using an integrated Intel compiler.
|
|
# SET(CMAKE_C_COMPILER_ID "MSVC")
|
|
ENDIF(${CMAKE_GENERATOR} MATCHES "Visual Studio")
|
|
|
|
IF(NOT CMAKE_C_COMPILER_ID_RUN)
|
|
SET(CMAKE_C_COMPILER_ID_RUN 1)
|
|
|
|
# Try to identify the compiler.
|
|
SET(CMAKE_C_COMPILER_ID)
|
|
INCLUDE(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerId.cmake)
|
|
CMAKE_DETERMINE_COMPILER_ID(C CFLAGS ${CMAKE_ROOT}/Modules/CMakeCCompilerId.c)
|
|
|
|
# Set old compiler and platform id variables.
|
|
IF("${CMAKE_C_COMPILER_ID}" MATCHES "GNU")
|
|
SET(CMAKE_COMPILER_IS_GNUCC 1)
|
|
ENDIF("${CMAKE_C_COMPILER_ID}" MATCHES "GNU")
|
|
IF("${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")
|
|
SET(CMAKE_COMPILER_IS_MINGW 1)
|
|
ELSEIF("${CMAKE_C_PLATFORM_ID}" MATCHES "Cygwin")
|
|
SET(CMAKE_COMPILER_IS_CYGWIN 1)
|
|
ENDIF("${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")
|
|
ENDIF(NOT CMAKE_C_COMPILER_ID_RUN)
|
|
|
|
INCLUDE(CMakeFindBinUtils)
|
|
|
|
# configure variables set in this file for fast reload later on
|
|
CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in
|
|
"${CMAKE_PLATFORM_ROOT_BIN}/CMakeCCompiler.cmake" IMMEDIATE)
|
|
|
|
SET(CMAKE_C_COMPILER_ENV_VAR "CC")
|