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It's a long story involving CMAKE_FIND_ROOT_PATH. See the patch for details. Closes: https://bugs.gentoo.org/950314 Closes: https://github.com/gentoo/gentoo/pull/40856 Signed-off-by: James Le Cuirot <chewi@gentoo.org>
37 lines
1.7 KiB
Diff
37 lines
1.7 KiB
Diff
When cross-compiling, CMake needs to find the build host's Qt6CoreTools. It
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therefore prepends QT_HOST_PATH, which is /usr, to CMAKE_FIND_ROOT_PATH. The
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problem is that CMAKE_FIND_ROOT_PATH is only a hint, not a definitive
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location. Just below, CMake's find_package is usually told to look in
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/usr/${CHOST}/usr/lib/cmake and /usr/lib/cmake when cross-compiling. Since
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both of these are under /usr, it chooses the former instead of the latter.
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It then ends up trying to execute non-native Qt binaries.
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We can avoid this problem by setting CMAKE_FIND_ROOT_PATH to a more precise
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location. All the Qt6 modules are installed under /usr/lib/cmake, represented
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by the __qt_find_package_host_qt_path variable, so we can point it there.
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find_package has two modes, module mode and config mode. No mode is
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explicitly chosen in this case, so it tries both. In module mode, it would
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use a module called FindQt6*.cmake, but no such module exists. It is
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therefore safe to assume config mode, which involves the files under
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/usr/lib/cmake.
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See the isSameDirectoryOrSubDirectory() call in CMake's
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cmFindCommon::RerootPaths() function for exactly where this goes wrong.
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Chewi
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https://bugs.gentoo.org/950314
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--- a/cmake/QtConfig.cmake.in
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+++ b/cmake/QtConfig.cmake.in
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@@ -131,7 +131,7 @@
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set(__qt_backup_cmake_find_root_path "${CMAKE_FIND_ROOT_PATH}")
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list(PREPEND CMAKE_PREFIX_PATH "${__qt_find_package_host_qt_path}"
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${_qt_additional_host_packages_prefix_paths})
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- list(PREPEND CMAKE_FIND_ROOT_PATH "${QT_HOST_PATH}"
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+ list(PREPEND CMAKE_FIND_ROOT_PATH "${__qt_find_package_host_qt_path}"
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${_qt_additional_host_packages_root_paths})
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endif()
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