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227 lines
8.0 KiB
227 lines
8.0 KiB
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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# determine the compiler to use for C programs
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# NOTE, a generator may set CMAKE_C_COMPILER before
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# loading this file to force a compiler.
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# use environment variable CC first if defined by user, next use
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# the cmake variable CMAKE_GENERATOR_CC which can be defined by a generator
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# as a default compiler
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# If the internal cmake variable _CMAKE_TOOLCHAIN_PREFIX is set, this is used
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# as prefix for the tools (e.g. arm-elf-gcc, arm-elf-ar etc.). This works
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# currently with the GNU crosscompilers.
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#
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# Sets the following variables:
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# CMAKE_C_COMPILER
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# CMAKE_AR
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# CMAKE_RANLIB
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# CMAKE_COMPILER_IS_GNUCC
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#
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# If not already set before, it also sets
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# _CMAKE_TOOLCHAIN_PREFIX
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include(${CMAKE_ROOT}/Modules/CMakeDetermineCompiler.cmake)
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# Load system-specific compiler preferences for this language.
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include(Platform/${CMAKE_SYSTEM_NAME}-Determine-C OPTIONAL)
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include(Platform/${CMAKE_SYSTEM_NAME}-C OPTIONAL)
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if(NOT CMAKE_C_COMPILER_NAMES)
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set(CMAKE_C_COMPILER_NAMES cc)
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endif()
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if(${CMAKE_GENERATOR} MATCHES "Visual Studio")
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elseif("${CMAKE_GENERATOR}" MATCHES "Green Hills MULTI")
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elseif("${CMAKE_GENERATOR}" MATCHES "Xcode")
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set(CMAKE_C_COMPILER_XCODE_TYPE sourcecode.c.c)
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_cmake_find_compiler_path(C)
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else()
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if(NOT CMAKE_C_COMPILER)
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set(CMAKE_C_COMPILER_INIT NOTFOUND)
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# prefer the environment variable CC
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if(NOT $ENV{CC} STREQUAL "")
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get_filename_component(CMAKE_C_COMPILER_INIT $ENV{CC} PROGRAM PROGRAM_ARGS CMAKE_C_FLAGS_ENV_INIT)
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if(CMAKE_C_FLAGS_ENV_INIT)
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set(CMAKE_C_COMPILER_ARG1 "${CMAKE_C_FLAGS_ENV_INIT}" CACHE STRING "First argument to C compiler")
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endif()
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if(NOT EXISTS ${CMAKE_C_COMPILER_INIT})
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message(FATAL_ERROR "Could not find compiler set in environment variable CC:\n$ENV{CC}.")
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endif()
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endif()
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# next try prefer the compiler specified by the generator
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if(CMAKE_GENERATOR_CC)
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if(NOT CMAKE_C_COMPILER_INIT)
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set(CMAKE_C_COMPILER_INIT ${CMAKE_GENERATOR_CC})
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endif()
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endif()
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# finally list compilers to try
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if(NOT CMAKE_C_COMPILER_INIT)
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set(CMAKE_C_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}cc ${_CMAKE_TOOLCHAIN_PREFIX}gcc cl bcc xlc clang)
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endif()
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_cmake_find_compiler(C)
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else()
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_cmake_find_compiler_path(C)
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endif()
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mark_as_advanced(CMAKE_C_COMPILER)
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# Each entry in this list is a set of extra flags to try
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# adding to the compile line to see if it helps produce
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# a valid identification file.
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set(CMAKE_C_COMPILER_ID_TEST_FLAGS_FIRST)
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set(CMAKE_C_COMPILER_ID_TEST_FLAGS
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# Try compiling to an object file only.
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"-c"
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# Try enabling ANSI mode on HP.
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"-Aa"
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# Try compiling K&R-compatible code (needed by Bruce C Compiler).
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"-D__CLASSIC_C__"
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# ARMClang need target options
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"--target=arm-arm-none-eabi -mcpu=cortex-m3"
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)
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endif()
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# Build a small source file to identify the compiler.
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if(NOT CMAKE_C_COMPILER_ID_RUN)
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set(CMAKE_C_COMPILER_ID_RUN 1)
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# Try to identify the compiler.
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set(CMAKE_C_COMPILER_ID)
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set(CMAKE_C_PLATFORM_ID)
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file(READ ${CMAKE_ROOT}/Modules/CMakePlatformId.h.in
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CMAKE_C_COMPILER_ID_PLATFORM_CONTENT)
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# The IAR compiler produces weird output.
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# See https://gitlab.kitware.com/cmake/cmake/-/issues/10176#note_153591
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list(APPEND CMAKE_C_COMPILER_ID_VENDORS IAR)
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set(CMAKE_C_COMPILER_ID_VENDOR_FLAGS_IAR )
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set(CMAKE_C_COMPILER_ID_VENDOR_REGEX_IAR "IAR .+ Compiler")
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# Match the link line from xcodebuild output of the form
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# Ld ...
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# ...
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# /path/to/cc ...CompilerIdC/...
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# to extract the compiler front-end for the language.
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set(CMAKE_C_COMPILER_ID_TOOL_MATCH_REGEX "\nLd[^\n]*(\n[ \t]+[^\n]*)*\n[ \t]+([^ \t\r\n]+)[^\r\n]*-o[^\r\n]*CompilerIdC/(\\./)?(CompilerIdC.(framework|xctest)/)?CompilerIdC[ \t\n\\\"]")
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set(CMAKE_C_COMPILER_ID_TOOL_MATCH_INDEX 2)
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include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerId.cmake)
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CMAKE_DETERMINE_COMPILER_ID(C CFLAGS CMakeCCompilerId.c)
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_cmake_find_compiler_sysroot(C)
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# Set old compiler and platform id variables.
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if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
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set(CMAKE_COMPILER_IS_GNUCC 1)
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endif()
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if(CMAKE_C_PLATFORM_ID MATCHES "MinGW")
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set(CMAKE_COMPILER_IS_MINGW 1)
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elseif(CMAKE_C_PLATFORM_ID MATCHES "Cygwin")
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set(CMAKE_COMPILER_IS_CYGWIN 1)
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endif()
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else()
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if(NOT DEFINED CMAKE_C_COMPILER_FRONTEND_VARIANT)
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# Some toolchain files set our internal CMAKE_C_COMPILER_ID_RUN
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# variable but are not aware of CMAKE_C_COMPILER_FRONTEND_VARIANT.
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# They pre-date our support for the GNU-like variant targeting the
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# MSVC ABI so we do not consider that here.
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if(CMAKE_C_COMPILER_ID STREQUAL "Clang")
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if("x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC")
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set(CMAKE_C_COMPILER_FRONTEND_VARIANT "MSVC")
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else()
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set(CMAKE_C_COMPILER_FRONTEND_VARIANT "GNU")
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endif()
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else()
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set(CMAKE_C_COMPILER_FRONTEND_VARIANT "")
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endif()
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endif()
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endif()
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if (NOT _CMAKE_TOOLCHAIN_LOCATION)
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get_filename_component(_CMAKE_TOOLCHAIN_LOCATION "${CMAKE_C_COMPILER}" PATH)
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endif ()
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# If we have a gcc cross compiler, they have usually some prefix, like
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# e.g. powerpc-linux-gcc, arm-elf-gcc or i586-mingw32msvc-gcc, optionally
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# with a 3-component version number at the end (e.g. arm-eabi-gcc-4.5.2).
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# The other tools of the toolchain usually have the same prefix
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# NAME_WE cannot be used since then this test will fail for names like
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# "arm-unknown-nto-qnx6.3.0-gcc.exe", where BASENAME would be
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# "arm-unknown-nto-qnx6" instead of the correct "arm-unknown-nto-qnx6.3.0-"
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if (NOT _CMAKE_TOOLCHAIN_PREFIX)
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if(CMAKE_C_COMPILER_ID MATCHES "GNU|Clang|QCC")
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get_filename_component(COMPILER_BASENAME "${CMAKE_C_COMPILER}" NAME)
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if (COMPILER_BASENAME MATCHES "^(.+-)(clang|g?cc)(-[0-9]+(\\.[0-9]+)*)?(-[^.]+)?(\\.exe)?$")
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set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_MATCH_1})
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set(_CMAKE_COMPILER_SUFFIX ${CMAKE_MATCH_5})
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elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
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if(CMAKE_C_COMPILER_TARGET)
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set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_C_COMPILER_TARGET}-)
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endif()
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elseif(COMPILER_BASENAME MATCHES "qcc(\\.exe)?$")
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if(CMAKE_C_COMPILER_TARGET MATCHES "gcc_nto([a-z0-9]+_[0-9]+|[^_le]+)(le)?")
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set(_CMAKE_TOOLCHAIN_PREFIX nto${CMAKE_MATCH_1}-)
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endif()
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endif ()
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# if "llvm-" is part of the prefix, remove it, since llvm doesn't have its own binutils
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# but uses the regular ar, objcopy, etc. (instead of llvm-objcopy etc.)
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if ("${_CMAKE_TOOLCHAIN_PREFIX}" MATCHES "(.+-)?llvm-$")
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set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_MATCH_1})
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endif ()
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elseif(CMAKE_C_COMPILER_ID MATCHES "TI")
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# TI compilers are named e.g. cl6x, cl470 or armcl.exe
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get_filename_component(COMPILER_BASENAME "${CMAKE_C_COMPILER}" NAME)
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if (COMPILER_BASENAME MATCHES "^(.+)?cl([^.]+)?(\\.exe)?$")
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set(_CMAKE_TOOLCHAIN_PREFIX "${CMAKE_MATCH_1}")
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set(_CMAKE_TOOLCHAIN_SUFFIX "${CMAKE_MATCH_2}")
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endif ()
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endif()
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endif ()
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set(_CMAKE_PROCESSING_LANGUAGE "C")
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include(CMakeFindBinUtils)
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include(Compiler/${CMAKE_C_COMPILER_ID}-FindBinUtils OPTIONAL)
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unset(_CMAKE_PROCESSING_LANGUAGE)
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if(CMAKE_C_COMPILER_SYSROOT)
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string(CONCAT _SET_CMAKE_C_COMPILER_SYSROOT
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"set(CMAKE_C_COMPILER_SYSROOT \"${CMAKE_C_COMPILER_SYSROOT}\")\n"
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"set(CMAKE_COMPILER_SYSROOT \"${CMAKE_C_COMPILER_SYSROOT}\")")
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else()
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set(_SET_CMAKE_C_COMPILER_SYSROOT "")
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endif()
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if(CMAKE_C_COMPILER_ARCHITECTURE_ID)
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set(_SET_CMAKE_C_COMPILER_ARCHITECTURE_ID
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"set(CMAKE_C_COMPILER_ARCHITECTURE_ID ${CMAKE_C_COMPILER_ARCHITECTURE_ID})")
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else()
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set(_SET_CMAKE_C_COMPILER_ARCHITECTURE_ID "")
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endif()
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if(MSVC_C_ARCHITECTURE_ID)
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set(SET_MSVC_C_ARCHITECTURE_ID
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"set(MSVC_C_ARCHITECTURE_ID ${MSVC_C_ARCHITECTURE_ID})")
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endif()
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if(CMAKE_C_XCODE_ARCHS)
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set(SET_CMAKE_XCODE_ARCHS
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"set(CMAKE_XCODE_ARCHS \"${CMAKE_C_XCODE_ARCHS}\")")
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endif()
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# configure variables set in this file for fast reload later on
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configure_file(${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in
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${CMAKE_PLATFORM_INFO_DIR}/CMakeCCompiler.cmake
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@ONLY
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)
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set(CMAKE_C_COMPILER_ENV_VAR "CC")
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