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CMake: Fix auto-detection of precompiled header support

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PCH files were only used while building qtbase. Make sure the value
is exported to the BuildInternalsConfig file, so the value is re-used
when building other repositories.

Also disable PCH when building simulator_and_device iOS builds, because
CMake doesn't currently generate separate PCH files per architecture.

Change-Id: I79955ebc557b800bc3c704deac519fe80012c229
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
This commit is contained in:
Alexandru Croitor 2020-03-24 11:19:21 +01:00
parent 874c6b00dd
commit 0446bf5ba3
3 changed files with 21 additions and 3 deletions
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3
CMakeLists.txt
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@ -46,9 +46,6 @@ if(NOT QT_BUILD_STANDALONE_TESTS)
## Should this Qt be built with Werror?
option(WARNINGS_ARE_ERRORS "Build Qt with warnings as errors" ${FEATURE_developer_build})
## Should Qt be built using PCH?
option(BUILD_WITH_PCH "Build Qt using precompiled headers?" ON)
## QtBase specific configure tests:
include(QtBaseConfigureTests)

17
cmake/QtAutoDetect.cmake
View File

@ -202,8 +202,25 @@ function(qt_auto_detect_darwin)
endif()
endfunction()
function(qt_auto_detect_pch)
set(default_value "ON")
if(CMAKE_OSX_ARCHITECTURES)
list(LENGTH CMAKE_OSX_ARCHITECTURES arch_count)
# CMake doesn't currently support PCH when multiple architecture are set. This is the
# case for simulator_and_device builds.
if(arch_count GREATER 1)
set(default_value "OFF")
message(WARNING "PCH support disabled due to usage of multiple architectures.")
endif()
endif()
option(BUILD_WITH_PCH "Build Qt using precompiled headers?" "${default_value}")
endfunction()
qt_auto_detect_cmake_config()
qt_auto_detect_darwin()
qt_auto_detect_ios()
qt_auto_detect_android()
qt_auto_detect_vpckg()
qt_auto_detect_pch()

4
cmake/QtPostProcess.cmake
View File

@ -361,6 +361,10 @@ function(qt_generate_build_internals_extra_cmake_code)
string(APPEND QT_EXTRA_BUILD_INTERNALS_VARS
"set(CMAKE_DEFAULT_BUILD_TYPE \"${CMAKE_DEFAULT_BUILD_TYPE}\" CACHE STRING \"\")\n")
endif()
if(DEFINED BUILD_WITH_PCH)
string(APPEND QT_EXTRA_BUILD_INTERNALS_VARS
"set(BUILD_WITH_PCH \"${BUILD_WITH_PCH}\" CACHE STRING \"\")\n")
endif()
qt_generate_install_prefixes(install_prefix_content)