bf315c5526
Aka handle CMAKE_INSTALL_PREFIX in a more relocatable way.
The following story inspired this change.
If a user wants to build a Qt repo into a different install prefix
than the usual Qt one, this will fail configuration because we
look for various things like syncqt, qdoc, etc relative to
CMAKE_INSTALL_PREFIX, which will now point to a different location
where none of the above tools are located.
The intent for such a use case is to support building Qt packages with
Conan, which sets a random install prefix when configuring a repo.
The idea is to derive the qt prefix dynamically from the
QtBuildInternals package location. Essentially it's a reverse relative
path from the QtBuildInternalsConfig.cmake file to the install prefix
that was specified when initially configuring qtbase.
Once the dynamic prefix is computed (so we know where the possibly
relocated Qt is), we can find tools like syncqt and qdoc.
This is an initial attempt to support a use case like that.
More design work will probably needed in case if tools / libs need to
be found in a location different than the Qt install prefix (so
support for multiple install prefixes / search paths).
An example of such a case would be when building qtdeclarative and
qtquickcontrols2 as Conan packages in one go. Most likely the
qmltyperegistrar tool will be located in the random install prefix
set by Conan, so building qtquickcontrols2 might fail due to not
finding the tool in the original Qt install prefix.
As to the implementation details, the change does the following:
- Dynamically computes and sets the
QT_BUILD_INTERNALS_RELOCATABLE_INSTALL_PREFIX variable when
find_package()'ing QtBuildInternals. It's an absolute path
pointing to where the relocated Qt is.
- When building qtbase this variable is not yet available (due
to QtBuildInternalsExtra not existing), in that case we set
the variable to the absolute path of CMAKE_INSTALL_PREFIX
(but only for the initial qtbase configuration).
- Remove QT_BUILD_INTERNALS_ORIGINAL_INSTALL_PREFIX which was used
for standalone tests purposes. It's not needed now that we compute
the location of the Qt prefix dynamically.
- The Unixy qt-cmake and qt-cmake-private shell scripts now
use a relative path to find the toolchain file we created.
- The toolchain file also dynamically computes the location of the Qt
packages, and adds them to CMAKE_PREFIX_PATH.
- A lot of existing CMAKE_INSTALL_PREFIX uses are replaced with
QT_BUILD_INTERNALS_RELOCATABLE_INSTALL_PREFIX. This includes finding
tool locations, mkspecs dir, path environment setup for tools, etc.
- Some places still use CMAKE_PREFIX_PATH in the following cases
- When determining paths while configuring qtbase (valid cases)
- When I wasn't sure what the behavior should be, so I left them
as-is (an example is documentation generation, do we want to
install it into the random Conan prefix, or into the main prefix?
Currently it installs in the random prefix).
Note that relocating a Qt installation does not work for non-prefix /
non-installed builds, due to hardcoded paths to include directories
and libraries in generated FooTargets.cmake files.
Task-number: QTBUG-83999
Change-Id: I87d6558729db93121b1715771034b03ce3295923
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
54 lines
2.7 KiB
CMake
54 lines
2.7 KiB
CMake
# Propagate common variables via BuildInternals package.
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set(QT_BUILD_SHARED_LIBS @BUILD_SHARED_LIBS@)
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option(BUILD_SHARED_LIBS "Build Qt statically or dynamically" @BUILD_SHARED_LIBS@)
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set(QT_CMAKE_EXPORT_NAMESPACE @QT_CMAKE_EXPORT_NAMESPACE@)
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set(INSTALL_CMAKE_NAMESPACE @INSTALL_CMAKE_NAMESPACE@)
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set(QT_BUILD_INTERNALS_PATH "${CMAKE_CURRENT_LIST_DIR}")
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# The relocatable install prefix is meant to be used to find things like host binaries (syncqt),
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# when the CMAKE_INSTALL_PREFIX is overridden to point to a different path (like when building a
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# a Qt repo using Conan, which will set a random install prefix instead of installing into the
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# original Qt install prefix).
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get_filename_component(QT_BUILD_INTERNALS_RELOCATABLE_INSTALL_PREFIX
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${CMAKE_CURRENT_LIST_DIR}/../@qt_path_from_cmake_config_dir_to_prefix@
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ABSOLUTE)
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# If no explicit CMAKE_INSTALL_PREFIX is provided, force set the original Qt installation prefix,
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# so that further modules / repositories are installed into same original location.
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# This means by default when configuring qtsvg / qtdeclarative, they will be installed the regular
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# Qt installation prefix.
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# If an explicit installation prefix is specified, honor it.
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# This is an attempt to support Conan, aka handle installation of modules into a
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# different installation prefix than the original one. Also allow to opt out via a special variable.
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if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT AND
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NOT QT_BUILD_INTERNALS_NO_FORCE_SET_INSTALL_PREFIX)
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set(CMAKE_INSTALL_PREFIX @CMAKE_INSTALL_PREFIX@ CACHE PATH
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"Install path prefix, prepended onto install directories." FORCE)
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endif()
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# Propagate developer builds to other modules via BuildInternals package.
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if(@FEATURE_developer_build@)
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set(FEATURE_developer_build ON CACHE BOOL "Developer build." FORCE)
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endif()
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# Propagate non-prefix builds.
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set(QT_WILL_INSTALL @QT_WILL_INSTALL@ CACHE BOOL
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"Boolean indicating if doing a Qt prefix build (vs non-prefix build)." FORCE)
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set(QT_SOURCE_TREE "@QT_SOURCE_TREE@" CACHE PATH
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"A path to the source tree of the previously configured QtBase project." FORCE)
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# Propagate decision of building tests and examples to other repositories.
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set(BUILD_TESTING @BUILD_TESTING@ CACHE BOOL "Build the testing tree.")
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set(BUILD_EXAMPLES @BUILD_EXAMPLES@ CACHE BOOL "Build Qt examples")
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set(QT_NO_MAKE_TESTS @QT_NO_MAKE_TESTS@ CACHE BOOL
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"Should tests be built as part of the default 'all' target.")
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set(QT_NO_MAKE_EXAMPLES @QT_NO_MAKE_EXAMPLES@ CACHE BOOL
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"Should examples be built as part of the default 'all' target.")
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# Propagate usage of ccache.
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set(QT_USE_CCACHE @QT_USE_CCACHE@ CACHE BOOL "Enable the use of ccache")
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# Extra set of exported variables
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@QT_EXTRA_BUILD_INTERNALS_VARS@
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