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build: Fix rebuild of link-test targets (#1278) 

The link-test targets rebuilt every time you built the project because
that is the behavior of commands attached to add_custom_target. This is
fixed by combining add_custom_command and add_custom_target.

Fixing that led to a situation where the link-test targets built on the
first build, but didn't properly rebuild when their dependencies
changed. This is fixed by using set_source_file_properties to treat
test.cc as dirty when the test-install command runs.
This commit is contained in:
Joey Parrish 2023-10-17 12:09:04 -07:00 committed by GitHub
parent 4cedb7ca98
commit 53eb7b1a38
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1 changed files with 15 additions and 1 deletions
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16
link-test/CMakeLists.txt
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@ -11,16 +11,30 @@ if(LIBPACKAGER_SHARED)
# Install the library and headers to a temporary location.
set(TEST_INSTALL_DIR ${CMAKE_BINARY_DIR}/test-install)
add_custom_target(test-install ALL
# Custom commands aren't targets, but have outputs.
add_custom_command(
DEPENDS mpd_generator packager libpackager
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
OUTPUT ${TEST_INSTALL_DIR}
COMMAND
${CMAKE_COMMAND} --install . --prefix ${TEST_INSTALL_DIR} --config "$<CONFIG>")
# Custom targets with commands run every time, no matter what. A custom
# target with no command, but which depends on a custom command's output,
# gets us something that acts like a real target and doesn't re-run every
# time.
add_custom_target(test-install ALL DEPENDS ${TEST_INSTALL_DIR})
# Then try to build a very simplistic test app to prove that we can include
# the headers and link the library.
add_executable(packager_link_test test.cc)
# Both of these are needed. The first is a basic dependency to make sure
# test-install runs first, whereas the second treats test.cc as dirty if
# test-install runs again.
add_dependencies(packager_link_test test-install)
set_source_files_properties(test.cc PROPERTIES OBJECT_DEPENDS ${TEST_INSTALL_DIR})
target_link_directories(packager_link_test PRIVATE ${TEST_INSTALL_DIR}/lib)
target_include_directories(packager_link_test PRIVATE ${TEST_INSTALL_DIR}/include)
if(NOT MSVC)