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AuQT66LTS
qt5base-lts/cmake/QtToolchainHelpers.cmake
Kai Köhne 3aa6f0b396 CMake: Use stored compiler only for qt-cmake-private 
Change the heuristic only to use the stored compiler if we
are  building qt itself, like with qt-cmake-private
/ qt-configure-module. qt-cmake is also used by end-users,
where the heuristic to change the compiler default base on
paths is surprising, and can go wrong.

Fixes: QTBUG-108323
Pick-to: 6.6
Change-Id: I0274e470f214a84711013d77068551f9097f4685
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
2023-10-18 14:41:33 +02:00

311 lines
16 KiB
CMake
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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: BSD-3-Clause
# Create a CMake toolchain file for convenient configuration of both internal Qt builds
# as well as CMake application projects.
# Expects various global variables to be set.
function(qt_internal_create_toolchain_file)
if(CMAKE_TOOLCHAIN_FILE)
file(TO_CMAKE_PATH "${CMAKE_TOOLCHAIN_FILE}" __qt_chainload_toolchain_file)
set(init_original_toolchain_file
"
set(__qt_initially_configured_toolchain_file \"${__qt_chainload_toolchain_file}\")
set(__qt_chainload_toolchain_file \"\${__qt_initially_configured_toolchain_file}\")
")
endif()
if(VCPKG_CHAINLOAD_TOOLCHAIN_FILE)
file(TO_CMAKE_PATH "${VCPKG_CHAINLOAD_TOOLCHAIN_FILE}" VCPKG_CHAINLOAD_TOOLCHAIN_FILE)
list(APPEND init_vcpkg
"set(VCPKG_CHAINLOAD_TOOLCHAIN_FILE \"${VCPKG_CHAINLOAD_TOOLCHAIN_FILE}\")")
endif()
if(VCPKG_TARGET_TRIPLET)
list(APPEND init_vcpkg
"set(VCPKG_TARGET_TRIPLET \"${VCPKG_TARGET_TRIPLET}\" CACHE STRING \"\")")
endif()
if(CMAKE_SYSTEM_NAME STREQUAL "Windows" AND CMAKE_SYSTEM_PROCESSOR STREQUAL "arm64" AND CMAKE_SYSTEM_VERSION STREQUAL "10")
list(APPEND init_platform "set(CMAKE_SYSTEM_NAME Windows CACHE STRING \"\")")
list(APPEND init_platform "set(CMAKE_SYSTEM_VERSION 10 CACHE STRING \"\")")
list(APPEND init_platform "set(CMAKE_SYSTEM_PROCESSOR arm64 CACHE STRING \"\")")
endif()
if(QT_QMAKE_TARGET_MKSPEC)
list(APPEND init_platform
"if(NOT QT_QMAKE_TARGET_MKSPEC)"
" set(QT_QMAKE_TARGET_MKSPEC ${QT_QMAKE_TARGET_MKSPEC} CACHE STRING \"\")"
"endif()"
)
endif()
if("${QT_QMAKE_TARGET_MKSPEC}" STREQUAL "linux-g++-32" AND NOT QT_NO_AUTO_DETECT_LINUX_X86)
set(__qt_toolchain_common_flags_init "-m32")
if(NOT QT_NO_OVERRIDE_LANG_FLAGS_INIT)
list(APPEND init_platform
"if(NOT QT_NO_OVERRIDE_LANG_FLAGS_INIT)")
list(APPEND init_platform
" set(__qt_toolchain_common_flags_init \"-m32\")")
list(APPEND init_platform
" set(CMAKE_C_FLAGS_INIT \"\${__qt_toolchain_common_flags_init}\")")
list(APPEND init_platform
" set(CMAKE_CXX_FLAGS_INIT \"\${__qt_toolchain_common_flags_init}\")")
list(APPEND init_platform
" set(CMAKE_ASM_FLAGS_INIT \"\${__qt_toolchain_common_flags_init}\")")
list(APPEND init_platform "endif()")
endif()
# Ubuntu-specific paths are used below.
# See comments of qt_auto_detect_linux_x86() for details.
if(NOT QT_NO_OVERRIDE_CMAKE_IGNORE_PATH)
list(APPEND init_platform
"if(NOT QT_NO_OVERRIDE_CMAKE_IGNORE_PATH)")
get_property(linux_x86_ignore_path GLOBAL PROPERTY _qt_internal_linux_x86_ignore_path)
string(REPLACE ";" "LITERAL_SEMICOLON"
linux_x86_ignore_path "${linux_x86_ignore_path}")
list(APPEND init_platform
" set(CMAKE_IGNORE_PATH \"${linux_x86_ignore_path}\")")
list(APPEND init_platform "endif()")
endif()
if(NOT QT_NO_OVERRIDE_PKG_CONFIG_LIBDIR)
list(APPEND init_platform
"if(NOT QT_NO_OVERRIDE_PKG_CONFIG_LIBDIR)")
get_property(pc_config_libdir GLOBAL PROPERTY _qt_internal_linux_x86_pc_config_libdir)
list(APPEND init_platform
" set(ENV{PKG_CONFIG_LIBDIR} \"${pc_config_libdir}\")")
list(APPEND init_platform
" set(ENV{PKG_CONFIG_DIR} \"\")")
list(APPEND init_platform "endif()")
endif()
endif()
# By default we don't want to allow mixing compilers for building different repositories, so we
# embed the initially chosen compilers into the toolchain.
# This is because on Windows compilers aren't easily mixed.
# We want to avoid that qtbase is built using cl.exe for example, and then for another repo
# gcc is picked up from %PATH%.
# The same goes when using a custom compiler on other platforms, such as ICC.
#
# There are a few exceptions though.
#
# When crosscompiling using Boot2Qt, the environment setup shell script sets up the CXX env var,
# which is used by CMake to determine the initial compiler that should be used.
# Unfortunately, the CXX env var contains not only the compiler name, but also a few required
# arch-specific compiler flags. This means that when building qtsvg, if the Qt created toolchain
# file sets the CMAKE_CXX_COMPILER variable, the CXX env var is ignored and thus the extra
# arch specific compiler flags are not picked up anymore, leading to a configuration failure.
#
# To avoid this issue, disable automatic embedding of the compilers into the qt toolchain when
# cross compiling. This is merely a heuristic, becacuse we don't have enough data to decide
# when to do it or not.
# For example on Linux one might want to allow mixing of clang and gcc (maybe).
#
# To allow such use cases when the default is wrong, one can provide a flag to explicitly opt-in
# or opt-out of the compiler embedding into the Qt toolchain.
#
# Passing -DQT_EMBED_TOOLCHAIN_COMPILER=ON will force embedding of the compilers.
# Passing -DQT_EMBED_TOOLCHAIN_COMPILER=OFF will disable embedding of the compilers.
set(__qt_embed_toolchain_compilers TRUE)
if(CMAKE_CROSSCOMPILING)
set(__qt_embed_toolchain_compilers FALSE)
endif()
if(DEFINED QT_EMBED_TOOLCHAIN_COMPILER)
if(QT_EMBED_TOOLCHAIN_COMPILER)
set(__qt_embed_toolchain_compilers TRUE)
else()
set(__qt_embed_toolchain_compilers FALSE)
endif()
endif()
if(__qt_embed_toolchain_compilers)
list(APPEND init_platform "
set(__qt_initial_c_compiler \"${CMAKE_C_COMPILER}\")
set(__qt_initial_cxx_compiler \"${CMAKE_CXX_COMPILER}\")
if(QT_USE_ORIGINAL_COMPILER AND NOT DEFINED CMAKE_C_COMPILER
AND EXISTS \"\${__qt_initial_c_compiler}\")
set(CMAKE_C_COMPILER \"\${__qt_initial_c_compiler}\" CACHE STRING \"\")
endif()
if(QT_USE_ORIGINAL_COMPILER AND NOT DEFINED CMAKE_CXX_COMPILER
AND EXISTS \"\${__qt_initial_cxx_compiler}\")
set(CMAKE_CXX_COMPILER \"\${__qt_initial_cxx_compiler}\" CACHE STRING \"\")
endif()")
endif()
unset(init_additional_used_variables)
if(APPLE)
# For an iOS simulator_and_device build, we should not explicitly set the sysroot, but let
# CMake do it's universal build magic to use one sysroot / sdk per-arch.
# For a single arch / sysroot iOS build, try to use the initially configured sysroot
# path if it exists, otherwise just set the name of the sdk to be used.
# The latter "name" part is important for user projects so that running 'xcodebuild' from
# the command line chooses the correct sdk.
# Also allow to opt out just in case.
#
# TODO: Figure out if the same should apply to universal macOS builds.
list(LENGTH CMAKE_OSX_ARCHITECTURES _qt_osx_architectures_count)
if(CMAKE_OSX_SYSROOT AND NOT _qt_osx_architectures_count GREATER 1 AND UIKIT)
list(APPEND init_platform "
set(__qt_uikit_sdk \"${QT_UIKIT_SDK}\")
set(__qt_initial_cmake_osx_sysroot \"${CMAKE_OSX_SYSROOT}\")
if(NOT DEFINED CMAKE_OSX_SYSROOT AND EXISTS \"\${__qt_initial_cmake_osx_sysroot}\")
set(CMAKE_OSX_SYSROOT \"\${__qt_initial_cmake_osx_sysroot}\" CACHE PATH \"\")
elseif(NOT DEFINED CMAKE_OSX_SYSROOT AND NOT QT_NO_SET_OSX_SYSROOT)
set(CMAKE_OSX_SYSROOT \"\${__qt_uikit_sdk}\" CACHE PATH \"\")
endif()")
endif()
if(CMAKE_OSX_DEPLOYMENT_TARGET)
list(APPEND init_platform
"set(CMAKE_OSX_DEPLOYMENT_TARGET \"${CMAKE_OSX_DEPLOYMENT_TARGET}\" CACHE STRING \"\")")
endif()
# Save list of initial architectures Qt was configured with.
set(_qt_osx_architectures_escaped "${CMAKE_OSX_ARCHITECTURES}")
string(REPLACE ";" "LITERAL_SEMICOLON"
_qt_osx_architectures_escaped "${_qt_osx_architectures_escaped}")
set(docstring "List of architectures Qt was built with")
list(APPEND init_platform
"set(QT_OSX_ARCHITECTURES \"${_qt_osx_architectures_escaped}\" CACHE STRING \"${docstring}\")")
list(APPEND init_platform "")
# When building another qt repo, ensure the same list of architectures is used by default.
# Detection of a qt repo is done by checking for QT_REPO_MODULE_VERSION which is set in
# the repo's .cmake.conf file.
# Most standalone tests will also be built with multiple architectures.
# Certain tests will be built with a single arch only (like tests/auto/cmake) to avoid
# issues in the CI when trying to build them on VMs that do not have a universal macOS
# SDK.
list(APPEND init_platform
"# Only build multiple architectures when building Qt itself. Can be explicitly enabled or disabled.")
list(APPEND init_platform "if((QT_REPO_MODULE_VERSION AND NOT QT_FORCE_SINGLE_QT_OSX_ARCHITECTURE) OR QT_FORCE_ALL_QT_OSX_ARCHITECTURES)")
list(APPEND init_platform " set(__qt_toolchain_building_qt_repo TRUE)")
list(APPEND init_platform " set(CMAKE_OSX_ARCHITECTURES \"\${QT_OSX_ARCHITECTURES}\" CACHE STRING \"\")")
list(APPEND init_platform "endif()")
list(APPEND init_platform "")
# For macOS user projects, default to not specifying any architecture. This means CMake will
# not pass an -arch flag to the compiler and the compiler will choose the default
# architecture to build for.
# On Apple Silicon, CMake will introspect whether it's running under Rosetta and will
# pass the detected architecture (x86_64 under Rosetta or arm64 natively) to the compiler.
# This is line with default CMake behavior for user projects.
#
# For iOS, we provide a bit more convenience.
# When the user project is built using the Xcode generator, we only specify the architecture
# if this is a single architecture Qt for iOS build. If we wouldn't, invoking just
# xcodebuild from the command line would try to build with the wrong architecture. Also
# provide an opt-out option just in case.
#
# For a multi-architecture build (so simulator_and_device) we set an explicit
# architecture for simulator only, via _qt_internal_set_ios_simulator_arch.
#
# When using the Ninja generator, specify the first architecture from QT_OSX_ARCHITECTURES
# (even with a simulator_and_device Qt build). This ensures that the default configuration
# at least tries to build something.
if(UIKIT)
qt_internal_get_first_osx_arch(osx_first_arch)
list(APPEND init_platform
"if((NOT CMAKE_GENERATOR STREQUAL \"Xcode\" AND NOT __qt_toolchain_building_qt_repo)
OR (CMAKE_GENERATOR STREQUAL \"Xcode\" AND __qt_uikit_sdk AND NOT QT_NO_SET_OSX_ARCHITECTURES))")
list(APPEND init_platform
" set(CMAKE_OSX_ARCHITECTURES \"${osx_first_arch}\" CACHE STRING \"\")")
list(APPEND init_platform "endif()")
list(APPEND init_platform "")
endif()
if(UIKIT)
list(APPEND init_platform
"set(CMAKE_SYSTEM_NAME \"${CMAKE_SYSTEM_NAME}\" CACHE STRING \"\")")
endif()
elseif(ANDROID)
list(APPEND init_platform
"# Detect Android SDK/NDK from environment before loading the Android platform toolchain file."
"if(\"$\{ANDROID_SDK_ROOT}\" STREQUAL \"\" AND NOT \"\$ENV{ANDROID_SDK_ROOT}\" STREQUAL \"\")"
" set(ANDROID_SDK_ROOT \"\$ENV{ANDROID_SDK_ROOT}\" CACHE STRING \"Path to the Android SDK\")"
"endif()"
"if(\"$\{ANDROID_NDK_ROOT}\" STREQUAL \"\" AND NOT \"\$ENV{ANDROID_NDK_ROOT}\" STREQUAL \"\")"
" set(ANDROID_NDK_ROOT \"\$ENV{ANDROID_NDK_ROOT}\" CACHE STRING \"Path to the Android NDK\")"
"endif()"
)
foreach(var ANDROID_PLATFORM ANDROID_NATIVE_API_LEVEL ANDROID_STL
ANDROID_ABI ANDROID_SDK_ROOT ANDROID_NDK_ROOT)
list(APPEND init_additional_used_variables
"list(APPEND __qt_toolchain_used_variables ${var})")
endforeach()
list(APPEND init_platform
"if(NOT DEFINED ANDROID_PLATFORM AND NOT DEFINED ANDROID_NATIVE_API_LEVEL)")
list(APPEND init_platform
" set(ANDROID_PLATFORM \"${ANDROID_PLATFORM}\" CACHE STRING \"\")")
list(APPEND init_platform "endif()")
list(APPEND init_platform "set(ANDROID_STL \"${ANDROID_STL}\" CACHE STRING \"\")")
list(APPEND init_platform "set(ANDROID_ABI \"${ANDROID_ABI}\" CACHE STRING \"\")")
list(APPEND init_platform "if (NOT DEFINED ANDROID_SDK_ROOT)")
file(TO_CMAKE_PATH "${ANDROID_SDK_ROOT}" __qt_android_sdk_root)
list(APPEND init_platform
" set(ANDROID_SDK_ROOT \"${__qt_android_sdk_root}\" CACHE STRING \"\")")
list(APPEND init_platform "endif()")
list(APPEND init_platform "if(NOT \"$\{ANDROID_NDK_ROOT\}\" STREQUAL \"\")")
list(APPEND init_platform
" set(__qt_toolchain_file_candidate \"$\{ANDROID_NDK_ROOT\}/build/cmake/android.toolchain.cmake\")")
list(APPEND init_platform " if(EXISTS \"$\{__qt_toolchain_file_candidate\}\")")
list(APPEND init_platform
" message(STATUS \"Android toolchain file within NDK detected: $\{__qt_toolchain_file_candidate\}\")")
list(APPEND init_platform " set(__qt_chainload_toolchain_file \"$\{__qt_toolchain_file_candidate\}\")")
list(APPEND init_platform " else()")
list(APPEND init_platform
" message(FATAL_ERROR \"Cannot find the toolchain file '$\{__qt_toolchain_file_candidate\}'. \"")
list(APPEND init_platform
" \"Please specify the toolchain file with -DQT_CHAINLOAD_TOOLCHAIN_FILE=<file>.\")")
list(APPEND init_platform " endif()")
list(APPEND init_platform "endif()")
elseif(EMSCRIPTEN)
list(APPEND init_platform
"include(\${CMAKE_CURRENT_LIST_DIR}/QtPublicWasmToolchainHelpers.cmake)
if(DEFINED ENV{EMSDK} AND NOT \"\$ENV{EMSDK}\" STREQUAL \"\")
__qt_internal_get_emroot_path_suffix_from_emsdk_env(__qt_toolchain_emroot_path)
__qt_internal_get_emscripten_cmake_toolchain_file_path_from_emsdk_env(
\"\${__qt_toolchain_emroot_path}\" _qt_candidate_emscripten_toolchain_path)
set(__qt_chainload_toolchain_file \"\${_qt_candidate_emscripten_toolchain_path}\")
endif()
")
list(APPEND init_post_chainload_toolchain "
if(NOT __qt_chainload_toolchain_file_included)
__qt_internal_show_error_no_emscripten_toolchain_file_found_when_using_qt()
endif()
")
endif()
string(REPLACE ";" "\n" init_additional_used_variables
"${init_additional_used_variables}")
string(REPLACE ";" "\n" init_vcpkg "${init_vcpkg}")
string(REPLACE ";" "\n" init_platform "${init_platform}")
string(REPLACE "LITERAL_SEMICOLON" ";" init_platform "${init_platform}")
string(REPLACE ";" "\n" init_post_chainload_toolchain "${init_post_chainload_toolchain}")
string(REPLACE "LITERAL_SEMICOLON" ";" init_post_chainload_toolchain
"${init_post_chainload_toolchain}")
qt_compute_relative_path_from_cmake_config_dir_to_prefix()
configure_file(
"${CMAKE_CURRENT_SOURCE_DIR}/cmake/qt.toolchain.cmake.in"
"${__GlobalConfig_build_dir}/qt.toolchain.cmake" @ONLY)
qt_install(FILES "${__GlobalConfig_build_dir}/qt.toolchain.cmake"
DESTINATION "${__GlobalConfig_install_dir}" COMPONENT Devel)
endfunction()
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