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# Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "cmake-common" project.
# For details, see https://github.com/egor-tensin/cmake-common.
# Distributed under the MIT License.
# See docs/cmake.md for a more thorough description of my pain.
import abc
import os.path
import shutil
import project.mingw
from project.os import on_windows
from project.platform import Platform
from project.toolset import ToolsetHint
class Toolset(abc.ABC):
def cmake_args(self, build_dir, platform):
return []
def build_system_args(self):
return []
@staticmethod
def detect(hint):
if hint is ToolsetHint.AUTO:
return Auto
if hint is ToolsetHint.MSVC:
return MSVC
if hint is ToolsetHint.GCC:
return GCC
if hint is ToolsetHint.MINGW:
return MinGW
if hint is ToolsetHint.CLANG:
return Clang
if hint is ToolsetHint.CLANG_CL:
return ClangCL
raise NotImplementedError(f'unrecognized toolset: {hint}')
@staticmethod
def make(hint, platform):
cls = Toolset.detect(hint)
if cls is MinGW:
return MinGW(platform)
return cls()
class Auto(Toolset):
def cmake_args(self, build_dir, platform):
if on_windows():
# On Windows, 'auto' means 'msvc', and we need to specify the -A
# parameter. This might break if none of the Visual Studio
# generators are available, but the NMake one is, although I don't
# know how this can be possible normally.
return MSVC().cmake_args(build_dir, platform)
# On Linux, if the platform wasn't specified, auto-detect everything.
# There's no need to set -mXX flags, etc.
if platform is Platform.AUTO:
return []
# If a specific platform was requested, we might need to set some
# CMake/compiler flags, like -m32/-m64.
return GCC().cmake_args(build_dir, platform)
class MSVC(Auto):
def cmake_args(self, build_dir, platform):
# This doesn't actually specify the generator of course, but I don't
# want to implement VS detection logic.
return ['-A', platform.msvc_arch()]
class Makefile(Toolset):
@staticmethod
def _get_config_path(build_dir):
return os.path.join(build_dir, 'custom_toolchain.cmake')
@staticmethod
def _get_makefile_generator():
if on_windows():
if shutil.which('mingw32-make'):
return 'MinGW Makefiles'
return 'Unix Makefiles'
# On Linux/Cygwin, make all the way:
return 'Unix Makefiles'
@staticmethod
def _write_config(build_dir, contents):
path = Makefile._get_config_path(build_dir)
with open(path, mode='w') as file:
file.write(contents)
return path
@abc.abstractmethod
def format_cmake_toolset_file(self, platform):
pass
def cmake_args(self, build_dir, platform):
contents = self.format_cmake_toolset_file(platform)
config_path = self._write_config(build_dir, contents)
return [
'-D', f'CMAKE_TOOLCHAIN_FILE={config_path}',
# The Visual Studio generator is the default on Windows, override
# it:
'-G', self._get_makefile_generator(),
]
class GCC(Makefile):
def format_cmake_toolset_file(self, platform):
return f'''
set(CMAKE_C_COMPILER gcc)
set(CMAKE_CXX_COMPILER g++)
{platform.makefile_toolset_file()}'''
class MinGW(Makefile):
def __init__(self, platform):
self.paths = project.mingw.MinGW(platform)
def format_cmake_toolset_file(self, platform):
return f'''
set(CMAKE_C_COMPILER {self.paths.gcc()})
set(CMAKE_CXX_COMPILER {self.paths.gxx()})
set(CMAKE_AR {self.paths.ar()})
set(CMAKE_RANLIB {self.paths.ranlib()})
set(CMAKE_RC_COMPILER {self.paths.windres()})
set(CMAKE_SYSTEM_NAME Windows)
'''
class Clang(Makefile):
def format_cmake_toolset_file(self, platform):
return f'''
if(CMAKE_VERSION VERSION_LESS "3.15" AND WIN32)
set(CMAKE_C_COMPILER clang-cl)
set(CMAKE_CXX_COMPILER clang-cl)
else()
set(CMAKE_C_COMPILER clang)
set(CMAKE_CXX_COMPILER clang++)
endif()
{platform.makefile_toolset_file()}'''
def _get_makefile_generator(self):
if on_windows():
# MinGW utilities like make might be unavailable, but NMake can
# very much be there.
if shutil.which('nmake'):
return 'NMake Makefiles'
return super()._get_makefile_generator()
class ClangCL(Clang):
def format_cmake_toolset_file(self, platform):
return f'''
set(CMAKE_C_COMPILER clang-cl)
set(CMAKE_CXX_COMPILER clang-cl)
set(CMAKE_SYSTEM_NAME Windows)
{platform.makefile_toolset_file()}'''
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