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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 ToolchainType
class Toolchain(abc.ABC):
@abc.abstractmethod
def cmake_args(self):
pass
@abc.abstractmethod
def build_system_args(self):
pass
@staticmethod
def detect(hint, platform, build_dir):
if hint is ToolchainType.AUTO:
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.
hint = ToolchainType.MSVC
else:
# 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 Auto()
# If a specific platform was requested, we might need to set
# some CMake/compiler flags, like -m32/-m64.
hint = ToolchainType.GCC
if hint is ToolchainType.MSVC:
return MSVC(platform)
if hint is ToolchainType.GCC:
return GCC.setup(platform, build_dir)
if hint is ToolchainType.MINGW:
return MinGW.setup(platform, build_dir)
if hint is ToolchainType.CLANG:
return Clang.setup(platform, build_dir)
if hint is ToolchainType.CLANG_CL:
return ClangCL.setup(platform, build_dir)
raise NotImplementedError(f'unrecognized toolset: {hint}')
class Auto(Toolchain):
def cmake_args(self):
return []
def build_system_args(self):
return []
class MSVC(Auto):
def __init__(self, platform):
self.platform = platform
def cmake_args(self):
# This doesn't actually specify the generator of course, but I don't
# want to implement VS detection logic.
return ['-A', self.platform.msvc_arch()]
def build_system_args(self):
return []
class Makefile(Toolchain):
def __init__(self, path):
self.path = path
@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'
@classmethod
def write_config(cls, build_dir, contents):
path = Makefile._get_config_path(build_dir)
with open(path, mode='w') as file:
file.write(contents)
return cls(path)
def cmake_args(self):
return [
'-D', f'CMAKE_TOOLCHAIN_FILE={self.path}',
# The Visual Studio generator is the default on Windows, override
# it:
'-G', self._get_makefile_generator(),
]
def build_system_args(self):
return []
class GCC(Makefile):
@staticmethod
def _format(platform):
return f'''
set(CMAKE_C_COMPILER gcc)
set(CMAKE_CXX_COMPILER g++)
{platform.makefile_toolchain_file()}'''
@staticmethod
def setup(platform, build_dir):
return GCC.write_config(build_dir, GCC._format(platform))
class MinGW(Makefile):
@staticmethod
def _format(platform):
paths = project.mingw.MinGW(platform)
return f'''
set(CMAKE_C_COMPILER {paths.gcc()})
set(CMAKE_CXX_COMPILER {paths.gxx()})
set(CMAKE_AR {paths.ar()})
set(CMAKE_RANLIB {paths.ranlib()})
set(CMAKE_RC_COMPILER {paths.windres()})
set(CMAKE_SYSTEM_NAME Windows)
'''
@staticmethod
def setup(platform, build_dir):
return MinGW.write_config(build_dir, MinGW._format(platform))
class Clang(Makefile):
@staticmethod
def _format(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_toolchain_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()
@staticmethod
def setup(platform, build_dir):
return Clang.write_config(build_dir, Clang._format(platform))
class ClangCL(Clang):
@staticmethod
def _format(platform):
return f'''
set(CMAKE_C_COMPILER clang-cl)
set(CMAKE_CXX_COMPILER clang-cl)
set(CMAKE_SYSTEM_NAME Windows)
{platform.makefile_toolchain_file()}'''
@staticmethod
def setup(platform, build_dir):
return ClangCL.write_config(build_dir, ClangCL._format(platform))
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