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Rework how installation is prevented in non-prefix builds

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In non-prefix builds, we want to prevent users from accidentally running
"cmake --install".  We did that by replacing cmake_install.cmake with an
empty file.

The responsible target remove_cmake_install is visible in IDEs, appears
in the build output, and the approach is hacky.

It's cleaner and easier to add bail out code at the top of
cmake_install.cmake.  This is now done when calling qt_build_repo_begin.

As a bonus, print an informative message on installation.

Change-Id: I022b36289358ba09cac8b79781f44cd7b93113f7
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
This commit is contained in:
Joerg Bornemann 2021-09-08 09:30:11 +02:00
parent a36a795770
commit fb9cc52920
3 changed files with 17 additions and 41 deletions
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17
cmake/QtBuildInternals/QtBuildInternalsConfig.cmake
View File

@ -370,6 +370,23 @@ endmacro()
macro(qt_build_repo_begin)
qt_build_internals_set_up_private_api()
# Prevent installation in non-prefix builds.
# We need to associate targets with export names, and that is only possible to do with the
# install(TARGETS) command. But in a non-prefix build, we don't want to install anything.
# To make sure that developers don't accidentally run make install, add bail out code to
# cmake_install.cmake.
if(NOT QT_WILL_INSTALL)
# In a top-level build, print a message only in qtbase, which is the first repository.
if(NOT QT_SUPERBUILD OR (PROJECT_NAME STREQUAL "QtBase"))
install(CODE [[message(FATAL_ERROR
"Qt was configured as non-prefix build. "
"Installation is not supported for this arrangement.")]])
endif()
install(CODE [[return()]])
endif()
qt_enable_cmake_languages()
# Add global docs targets that will work both for per-repo builds, and super builds.

38
cmake/QtInstallHelpers.cmake
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@ -88,44 +88,6 @@ function(qt_copy_or_install)
qt_non_prefix_copy(COPY ${argv_copy} ${copy_arguments})
endfunction()
# Hacky way to remove the install target in non-prefix builds.
# We need to associate targets with export names, and that is only possible to do with the
# install(TARGETS) command. But in a non-prefix build, we don't want to install anything.
# To make sure that developers don't accidentally run make install, replace the generated
# cmake_install.cmake file with an empty file. To do this, always create a new temporary file
# at CMake configuration step, and use it as an input to a custom command that replaces the
# cmake_install.cmake file with an empty one. This means we will always replace the file on
# every reconfiguration, but not when doing null builds.
function(qt_remove_install_target)
# On superbuilds we only do this for qtbase - it will correctly remove the
# cmake_install.cmake at the root of the repository.
if(QT_SUPERBUILD)
if(NOT (PROJECT_NAME STREQUAL "QtBase"))
return()
endif()
endif()
set(file_in "${CMAKE_BINARY_DIR}/.remove_cmake_install_in.txt")
set(file_generated "${CMAKE_BINARY_DIR}/.remove_cmake_install_generated.txt")
set(cmake_install_file "${CMAKE_BINARY_DIR}/cmake_install.cmake")
file(WRITE ${file_in} "")
add_custom_command(OUTPUT ${file_generated}
COMMAND ${CMAKE_COMMAND} -E copy ${file_in} ${file_generated}
COMMAND ${CMAKE_COMMAND} -E remove ${cmake_install_file}
COMMAND ${CMAKE_COMMAND} -E touch ${cmake_install_file}
COMMENT "Removing cmake_install.cmake"
MAIN_DEPENDENCY ${file_in})
add_custom_target(remove_cmake_install ALL DEPENDS ${file_generated})
endfunction()
function(qt_set_up_nonprefix_build)
if(NOT QT_WILL_INSTALL)
qt_remove_install_target()
endif()
endfunction()
# Create a versioned hard-link for the given target.
# E.g. "bin/qmake6" -> "bin/qmake".
# If no hard link can be created, make a copy instead.

3
cmake/QtSetup.cmake
View File

@ -225,9 +225,6 @@ include(QtCompilerOptimization)
## Compiler flags:
include(QtCompilerFlags)
## Set up non-prefix build:
qt_set_up_nonprefix_build()
qt_set_language_standards()
option(QT_USE_CCACHE "Enable the use of ccache")