qt5base-lts/cmake/qt.toolchain.cmake.in
Alexandru Croitor a6a3b82ffb CMake: Make generated Qt toolchain file a bit more relocatable
Rather than force setting the apple sysroot and Qt host paths, first
check if they are not already defined on the command line and if they
aren't, check that the paths with which Qt was configured exist.

The goal of the patch is to not set invalid paths, like when using a
Qt built in the CI, which will have a different host path / sysroot
compared to what a user has locally.

Task-number: QTBUG-85240
Change-Id: Ic37566b4fa845d8d1b4e4b5ba7fa4be769e99ca8
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
2020-09-09 18:52:50 +02:00

40 lines
2.0 KiB
CMake

@init_platform@
@init_qt_host_path@
@init_qt_host_path_cmake_dir@
@init_original_toolchain_file@
@init_vcpkg@
if(__qt_chainload_toolchain_file)
get_filename_component(__qt_chainload_toolchain_file_real_path
"${__qt_chainload_toolchain_file}" REALPATH)
if(__qt_chainload_toolchain_file_real_path STREQUAL CMAKE_CURRENT_LIST_FILE)
message(FATAL_ERROR
"Woah, the Qt toolchain file tried to include itself recusively! '${__qt_chainload_toolchain_file}' "
"Make sure to remove qtbase/CMakeCache.txt and reconfigure qtbase with 'cmake' "
"rather than 'qt-cmake', and then you can reconfigure your own project."
)
else()
include("${__qt_chainload_toolchain_file}")
endif()
unset(__qt_chainload_toolchain_file)
endif()
# Compute dynamically the Qt installation prefix from the location of this file. This allows
# the usage of the toolchain file when the Qt installation is relocated.
get_filename_component(QT_TOOLCHAIN_RELOCATABLE_INSTALL_PREFIX
${CMAKE_CURRENT_LIST_DIR}/../@qt_path_from_cmake_config_dir_to_prefix@
ABSOLUTE)
# Compute the path to the installed Qt lib/cmake folder.
# We assume that the Qt toolchain location is inside the CMake Qt6 package, and thus the directory
# one level higher is what we're looking for.
get_filename_component(QT_TOOLCHAIN_RELOCATABLE_CMAKE_DIR "${CMAKE_CURRENT_LIST_DIR}/.." ABSOLUTE)
# There's a subdirectory check in cmake's cmFindCommon::RerootPaths() function, that doesn't handle
# the case of CMAKE_PREFIX_PATH == CMAKE_FIND_ROOT_PATH for a particular pair of entries.
# Instead of collapsing the search prefix (which is the case when one is a subdir of the other),
# it concatenates them creating an invalid path. Workaround it by setting the root path to the
# Qt install prefix, and the prefix path to the lib/cmake subdir.
list(PREPEND CMAKE_PREFIX_PATH "${QT_TOOLCHAIN_RELOCATABLE_CMAKE_DIR}")
list(PREPEND CMAKE_FIND_ROOT_PATH "${QT_TOOLCHAIN_RELOCATABLE_INSTALL_PREFIX}")