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CMake/Modules/CMakeDetermineCCompiler.cmake
makise-homura e5d9fce03f LCC: Add dedicated support for MCST LCC compiler 
Divert LCC compiler as a new one, instead of treating it as GNU.

Since old times, Elbrus C/C++/Fortran Compiler (LCC) by MCST has been
passing checks for GNU compilers, so it has been identified as GNU.
Now, with intent of seriously upstreaming its support, it has been
added as a separate LCC compiler, and its version displays not a
supported GCC version, but LCC version itself (e.g. LCC 1.25.19 instead
of GNU 7.3.0).

This commit adds its support for detection, and also converts basically
every check like 'is this compiler GNU?' to 'is this compiler GNU or
LCC?'. The only places where this check is untouched, is where it
regards other platforms where LCC is unavailable (primarily non-Linux),
and where it REALLY differs from GNU compiler.

Note: this transition may break software that are already ported to
Elbrus, but hardly relies that LCC will be detected as GNU; still such
software is not known.
2021-10-15 05:05:19 +03:00

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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
# 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
include(${CMAKE_ROOT}/Modules/CMakeDetermineCompiler.cmake)
# Load system-specific compiler preferences for this language.
include(Platform/${CMAKE_SYSTEM_NAME}-Determine-C OPTIONAL)
include(Platform/${CMAKE_SYSTEM_NAME}-C OPTIONAL)
if(NOT CMAKE_C_COMPILER_NAMES)
set(CMAKE_C_COMPILER_NAMES cc)
endif()
if(${CMAKE_GENERATOR} MATCHES "Visual Studio")
elseif("${CMAKE_GENERATOR}" MATCHES "Green Hills MULTI")
elseif("${CMAKE_GENERATOR}" MATCHES "Xcode")
set(CMAKE_C_COMPILER_XCODE_TYPE sourcecode.c.c)
_cmake_find_compiler_path(C)
else()
if(NOT CMAKE_C_COMPILER)
set(CMAKE_C_COMPILER_INIT NOTFOUND)
# prefer the environment variable CC
if(NOT $ENV{CC} STREQUAL "")
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 "Arguments to C compiler")
endif()
if(NOT EXISTS ${CMAKE_C_COMPILER_INIT})
message(FATAL_ERROR "Could not find compiler set in environment variable CC:\n$ENV{CC}.")
endif()
endif()
# 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()
endif()
# finally list compilers to try
if(NOT CMAKE_C_COMPILER_INIT)
set(CMAKE_C_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}cc ${_CMAKE_TOOLCHAIN_PREFIX}gcc cl bcc xlc icx clang)
endif()
_cmake_find_compiler(C)
else()
_cmake_find_compiler_path(C)
endif()
mark_as_advanced(CMAKE_C_COMPILER)
# Each entry in this list is a set of extra flags to try
# adding to the compile line to see if it helps produce
# a valid identification file.
set(CMAKE_C_COMPILER_ID_TEST_FLAGS_FIRST)
set(CMAKE_C_COMPILER_ID_TEST_FLAGS
# Try compiling to an object file only.
"-c"
# Try enabling ANSI mode on HP.
"-Aa"
# Try compiling K&R-compatible code (needed by Bruce C Compiler).
"-D__CLASSIC_C__"
# ARMClang need target options
"--target=arm-arm-none-eabi -mcpu=cortex-m3"
# MSVC needs at least one include directory for __has_include to function,
# but custom toolchains may run MSVC with no INCLUDE env var and no -I flags.
# Also avoid linking so this works with no LIB env var.
"-c -I__does_not_exist__"
)
endif()
if(CMAKE_C_COMPILER_TARGET)
set(CMAKE_C_COMPILER_ID_TEST_FLAGS_FIRST "-c --target=${CMAKE_C_COMPILER_TARGET}")
endif()
# Build a small source file to identify the compiler.
if(NOT CMAKE_C_COMPILER_ID_RUN)
set(CMAKE_C_COMPILER_ID_RUN 1)
# Try to identify the compiler.
set(CMAKE_C_COMPILER_ID)
set(CMAKE_C_PLATFORM_ID)
file(READ ${CMAKE_ROOT}/Modules/CMakePlatformId.h.in
CMAKE_C_COMPILER_ID_PLATFORM_CONTENT)
# The IAR compiler produces weird output.
# See https://gitlab.kitware.com/cmake/cmake/-/issues/10176#note_153591
list(APPEND CMAKE_C_COMPILER_ID_VENDORS IAR)
set(CMAKE_C_COMPILER_ID_VENDOR_FLAGS_IAR )
set(CMAKE_C_COMPILER_ID_VENDOR_REGEX_IAR "IAR .+ Compiler")
# Match the link line from xcodebuild output of the form
# Ld ...
# ...
# /path/to/cc ...CompilerIdC/...
# to extract the compiler front-end for the language.
set(CMAKE_C_COMPILER_ID_TOOL_MATCH_REGEX "\nLd[^\n]*(\n[ \t]+[^\n]*)*\n[ \t]+([^ \t\r\n]+)[^\r\n]*-o[^\r\n]*CompilerIdC/(\\./)?(CompilerIdC.(framework|xctest|build/[^ \t\r\n]+)/)?CompilerIdC[ \t\n\\\"]")
set(CMAKE_C_COMPILER_ID_TOOL_MATCH_INDEX 2)
include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerId.cmake)
CMAKE_DETERMINE_COMPILER_ID(C CFLAGS CMakeCCompilerId.c)
_cmake_find_compiler_sysroot(C)
# Set old compiler and platform id variables.
if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
set(CMAKE_COMPILER_IS_GNUCC 1)
endif()
else()
if(NOT DEFINED CMAKE_C_COMPILER_FRONTEND_VARIANT)
# Some toolchain files set our internal CMAKE_C_COMPILER_ID_RUN
# variable but are not aware of CMAKE_C_COMPILER_FRONTEND_VARIANT.
# They pre-date our support for the GNU-like variant targeting the
# MSVC ABI so we do not consider that here.
if(CMAKE_C_COMPILER_ID STREQUAL "Clang"
OR "x${CMAKE_C_COMPILER_ID}" STREQUAL "xIntelLLVM")
if("x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC")
set(CMAKE_C_COMPILER_FRONTEND_VARIANT "MSVC")
else()
set(CMAKE_C_COMPILER_FRONTEND_VARIANT "GNU")
endif()
else()
set(CMAKE_C_COMPILER_FRONTEND_VARIANT "")
endif()
endif()
endif()
if (NOT _CMAKE_TOOLCHAIN_LOCATION)
get_filename_component(_CMAKE_TOOLCHAIN_LOCATION "${CMAKE_C_COMPILER}" PATH)
endif ()
# If we have a gcc cross compiler, they have usually some prefix, like
# e.g. powerpc-linux-gcc, arm-elf-gcc or i586-mingw32msvc-gcc, optionally
# with a 3-component version number at the end (e.g. arm-eabi-gcc-4.5.2).
# The other tools of the toolchain usually have the same prefix
# NAME_WE cannot be used since then this test will fail for names like
# "arm-unknown-nto-qnx6.3.0-gcc.exe", where BASENAME would be
# "arm-unknown-nto-qnx6" instead of the correct "arm-unknown-nto-qnx6.3.0-"
if (NOT _CMAKE_TOOLCHAIN_PREFIX)
if(CMAKE_C_COMPILER_ID MATCHES "GNU|Clang|QCC|LCC")
get_filename_component(COMPILER_BASENAME "${CMAKE_C_COMPILER}" NAME)
if (COMPILER_BASENAME MATCHES "^(.+-)?(clang|g?cc)(-cl)?(-[0-9]+(\\.[0-9]+)*)?(-[^.]+)?(\\.exe)?$")
set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_MATCH_1})
set(_CMAKE_TOOLCHAIN_SUFFIX ${CMAKE_MATCH_4})
set(_CMAKE_COMPILER_SUFFIX ${CMAKE_MATCH_6})
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
if(CMAKE_C_COMPILER_TARGET)
set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_C_COMPILER_TARGET}-)
endif()
elseif(COMPILER_BASENAME MATCHES "qcc(\\.exe)?$")
if(CMAKE_C_COMPILER_TARGET MATCHES "gcc_nto([a-z0-9]+_[0-9]+|[^_le]+)(le)?")
set(_CMAKE_TOOLCHAIN_PREFIX nto${CMAKE_MATCH_1}-)
endif()
endif ()
# if "llvm-" is part of the prefix, remove it, since llvm doesn't have its own binutils
# but uses the regular ar, objcopy, etc. (instead of llvm-objcopy etc.)
if ("${_CMAKE_TOOLCHAIN_PREFIX}" MATCHES "(.+-)?llvm-$")
set(_CMAKE_TOOLCHAIN_PREFIX ${CMAKE_MATCH_1})
endif ()
elseif(CMAKE_C_COMPILER_ID MATCHES "TI")
# TI compilers are named e.g. cl6x, cl470 or armcl.exe
get_filename_component(COMPILER_BASENAME "${CMAKE_C_COMPILER}" NAME)
if (COMPILER_BASENAME MATCHES "^(.+)?cl([^.]+)?(\\.exe)?$")
set(_CMAKE_TOOLCHAIN_PREFIX "${CMAKE_MATCH_1}")
set(_CMAKE_TOOLCHAIN_SUFFIX "${CMAKE_MATCH_2}")
endif ()
endif()
endif ()
set(_CMAKE_PROCESSING_LANGUAGE "C")
include(CMakeFindBinUtils)
include(Compiler/${CMAKE_C_COMPILER_ID}-FindBinUtils OPTIONAL)
unset(_CMAKE_PROCESSING_LANGUAGE)
if(CMAKE_C_COMPILER_SYSROOT)
string(CONCAT _SET_CMAKE_C_COMPILER_SYSROOT
"set(CMAKE_C_COMPILER_SYSROOT \"${CMAKE_C_COMPILER_SYSROOT}\")\n"
"set(CMAKE_COMPILER_SYSROOT \"${CMAKE_C_COMPILER_SYSROOT}\")")
else()
set(_SET_CMAKE_C_COMPILER_SYSROOT "")
endif()
if(CMAKE_C_COMPILER_ARCHITECTURE_ID)
set(_SET_CMAKE_C_COMPILER_ARCHITECTURE_ID
"set(CMAKE_C_COMPILER_ARCHITECTURE_ID ${CMAKE_C_COMPILER_ARCHITECTURE_ID})")
else()
set(_SET_CMAKE_C_COMPILER_ARCHITECTURE_ID "")
endif()
if(MSVC_C_ARCHITECTURE_ID)
set(SET_MSVC_C_ARCHITECTURE_ID
"set(MSVC_C_ARCHITECTURE_ID ${MSVC_C_ARCHITECTURE_ID})")
endif()
if(CMAKE_C_XCODE_ARCHS)
set(SET_CMAKE_XCODE_ARCHS
"set(CMAKE_XCODE_ARCHS \"${CMAKE_C_XCODE_ARCHS}\")")
endif()
# configure variables set in this file for fast reload later on
configure_file(${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in
${CMAKE_PLATFORM_INFO_DIR}/CMakeCCompiler.cmake
@ONLY
)
set(CMAKE_C_COMPILER_ENV_VAR "CC")
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