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CMake: Teach qt_config_compile_test to set the build output

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The qt_config_compile_test command now assigns the build output of a
config test to the TEST_${name}_OUTPUT variable in the callers scope.

We can use this to show error messages, and it can also be seen in
trace files for better troubleshooting.

It works for all project based calls with CMake 3.16, but for source
code based tests, due to the usage of check_cxx_source_compiles instead
of try_compile, it will only work for CMake 3.23+.

Pick-to: 6.5 6.6 6.7
Task-number: QTBUG-122596
Change-Id: Ib9664c158ba9a391bd17bf30a28f9a34eba991d5
Reviewed-by:  Alexey Edelev <alexey.edelev@qt.io>
This commit is contained in:
Alexandru Croitor 2024-02-21 11:29:51 +01:00
parent dfdb7a0430
commit 3334a77ecf
1 changed files with 24 additions and 3 deletions
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27
cmake/QtFeature.cmake
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@ -899,6 +899,11 @@ function(qt_internal_detect_dirty_features)
endif()
endfunction()
# Builds either a string of source code or a whole project to determine whether the build is
# successful.
#
# Sets a TEST_${name}_OUTPUT variable with the build output, to the scope of the calling function.
# Sets a TEST_${name} cache variable to either TRUE or FALSE if the build is successful or not.
function(qt_config_compile_test name)
if(DEFINED "TEST_${name}")
return()
@ -1021,8 +1026,11 @@ function(qt_config_compile_test name)
get_filename_component(arg_PROJECT_PATH "${arg_PROJECT_PATH}" REALPATH)
endif()
try_compile(HAVE_${name} "${CMAKE_BINARY_DIR}/config.tests/${name}" "${arg_PROJECT_PATH}"
"${name}" CMAKE_FLAGS ${flags} ${arg_CMAKE_FLAGS})
try_compile(
HAVE_${name} "${CMAKE_BINARY_DIR}/config.tests/${name}" "${arg_PROJECT_PATH}" "${name}"
CMAKE_FLAGS ${flags} ${arg_CMAKE_FLAGS}
OUTPUT_VARIABLE try_compile_output
)
if(${HAVE_${name}})
set(status_label "Success")
@ -1088,7 +1096,19 @@ function(qt_config_compile_test name)
set(_save_CMAKE_REQUIRED_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES}")
set(CMAKE_REQUIRED_LIBRARIES "${arg_LIBRARIES}")
check_cxx_source_compiles("${arg_UNPARSED_ARGUMENTS} ${arg_CODE}" HAVE_${name})
# OUTPUT_VARIABLE is an internal undocumented variable of check_cxx_source_compiles
# since 3.23. Allow an opt out in case this breaks in the future.
set(try_compile_output "")
set(output_var "")
if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.23"
AND NOT QT_INTERNAL_NO_TRY_COMPILE_OUTPUT_VARIABLE)
set(output_var OUTPUT_VARIABLE try_compile_output)
endif()
check_cxx_source_compiles(
"${arg_UNPARSED_ARGUMENTS} ${arg_CODE}" HAVE_${name} ${output_var}
)
set(CMAKE_REQUIRED_LIBRARIES "${_save_CMAKE_REQUIRED_LIBRARIES}")
set(CMAKE_C_STANDARD "${_save_CMAKE_C_STANDARD}")
@ -1100,6 +1120,7 @@ function(qt_config_compile_test name)
endif()
endif()
set(TEST_${name}_OUTPUT "${try_compile_output}" PARENT_SCOPE)
set(TEST_${name} "${HAVE_${name}}" CACHE INTERNAL "${arg_LABEL}")
endfunction()