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CMake: Handle missing packages in project compile tests

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If a find_package() in a try_compile project doesn't find a package,
and we then link against a non-existent target, the configuration
failure of the compile test also fails the configuration of the
project.

To avoid that, separate library targets from non-targets, and make sure
to only link against the targets if they exist.

pro2cmake now outputs modified compile test project code which iterates
over targets and non-target libraries, and links against them when
needed.

Change-Id: Ib0f4b5f07af13929c42d01a661df2cabdf9b926b
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
This commit is contained in:
Alexandru Croitor 2020-04-09 09:59:35 +02:00
parent c9b2528a9d
commit 066e8a4557
2 changed files with 26 additions and 2 deletions
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20
cmake/QtFeature.cmake
View File

@ -699,7 +699,25 @@ function(qt_config_compile_test name)
# Pass which libraries need to be linked against.
if(arg_LIBRARIES)
list(APPEND flags "-DQT_CONFIG_COMPILE_TEST_LIBRARIES:STRING=${arg_LIBRARIES}")
set(link_flags "")
set(library_targets "")
# Separate targets from link flags or paths. This is to prevent configuration failures
# when the targets are not found due to missing packages.
foreach(lib ${arg_LIBRARIES})
string(FIND "${lib}" "::" is_library_target)
if(is_library_target EQUAL -1)
list(APPEND link_flags "${lib}")
else()
list(APPEND library_targets "${lib}")
endif()
endforeach()
if(link_flags)
list(APPEND flags "-DQT_CONFIG_COMPILE_TEST_LIBRARIES:STRING=${link_flags}")
endif()
if(library_targets)
list(APPEND flags
"-DQT_CONFIG_COMPILE_TEST_LIBRARY_TARGETS:STRING=${library_targets}")
endif()
endif()
try_compile(HAVE_${name} "${CMAKE_BINARY_DIR}/config.tests/${name}" "${arg_PROJECT_PATH}"

8
util/cmake/pro2cmake.py
View File

@ -3948,7 +3948,13 @@ endforeach()
if(QT_CONFIG_COMPILE_TEST_LIBRARIES)
link_libraries(${QT_CONFIG_COMPILE_TEST_LIBRARIES})
endif()
if(QT_CONFIG_COMPILE_TEST_LIBRARY_TARGETS)
foreach(lib ${QT_CONFIG_COMPILE_TEST_LIBRARY_TARGETS})
if(TARGET ${lib})
link_libraries(${lib})
endif()
endforeach()
endif()
"""
)
cm_fh.write(f"{content}\n")