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[clang-doc][cmake] Copy assets to build directory #95187

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merged 3 commits into from
Jun 14, 2024
Merged

[clang-doc][cmake] Copy assets to build directory #95187

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753c6d4
[clang-doc][cmake] Copy assets to build directory
ilovepi Jun 12, 2024
d250a9a
Use helper utility to copy files
ilovepi Jun 13, 2024
c989ca3
Remove message argument
ilovepi Jun 13, 2024
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40 changes: 34 additions & 6 deletions clang-tools-extra/clang-doc/tool/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -18,10 +18,38 @@ target_link_libraries(clang-doc
clangDoc
)

install(FILES ../assets/clang-doc-default-stylesheet.css
DESTINATION "${CMAKE_INSTALL_DATADIR}/clang"
COMPONENT clang-doc)

install(FILES ../assets/index.js
DESTINATION "${CMAKE_INSTALL_DATADIR}/clang"
COMPONENT clang-doc)
set(assets
index.js
clang-doc-default-stylesheet.css
)

set(asset_dir "${CMAKE_CURRENT_SOURCE_DIR}/../assets")
set(resource_dir "${CMAKE_BINARY_DIR}/share/clang")
set(out_files)

function(copy_files_to_dst src_dir dst_dir file)
set(src "${src_dir}/${file}")
set(dst "${dst_dir}/${file}")
add_custom_command(OUTPUT ${dst}
DEPENDS ${src}
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src} ${dst}
COMMENT "Copying ${file} to ${dst_dir}"
)
list(APPEND out_files ${dst})
set(out_files ${out_files} PARENT_SCOPE)
endfunction(copy_files_to_dst)

foreach(f ${assets})
install(FILES ${asset_dir}/${f}
DESTINATION "${CMAKE_INSTALL_DATADIR}/clang"
COMPONENT clang-doc)
copy_files_to_dst(${asset_dir} ${resource_dir} ${f})
endforeach(f)

add_custom_target(copy-clang-doc-assets
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We prefer having a rule per file since most systems don't have a reliable way to tell if the directory content has changed. The approach we usually use to to have one add_custom_command per file with a single add_custom_target that depends on all output files, see for example

llvm-project/libcxx/include/CMakeLists.txt

Lines 1024 to 1043 in 092dbfa

foreach(f ${files})
set(src "${CMAKE_CURRENT_SOURCE_DIR}/${f}")
set(dst "${LIBCXX_GENERATED_INCLUDE_DIR}/${f}")
add_custom_command(OUTPUT ${dst}
DEPENDS ${src}
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src} ${dst}
COMMENT "Copying CXX header ${f}")
list(APPEND _all_includes "${dst}")
endforeach()
# Generate the IWYU mapping. This depends on all header files but it's also considered as an
# "include" for dependency tracking.
add_custom_command(OUTPUT "${LIBCXX_GENERATED_INCLUDE_DIR}/libcxx.imp"
COMMAND "${Python3_EXECUTABLE}" "${LIBCXX_SOURCE_DIR}/utils/generate_iwyu_mapping.py" "-o" "${LIBCXX_GENERATED_INCLUDE_DIR}/libcxx.imp"
DEPENDS ${_all_includes}
COMMENT "Generate the mapping file for include-what-you-use"
)
list(APPEND _all_includes "${LIBCXX_GENERATED_INCLUDE_DIR}/libcxx.imp")
add_custom_target(generate-cxx-headers ALL DEPENDS ${_all_includes})
or https://github.com/llvm/llvm-project/blob/092dbfaad257885692fa64559e9eb43a5c466798/clang/lib/Headers/CMakeLists.txt

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OK, I’ll take a pass at adapting one of those for use here. If I think I can generalize it, I’ll make another PR to add it as a utility in the llvm cmake module.

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I think this is addressed now. I more or less cribed directly from the clang header example. Initially I tried to have the function be a bit more generic and put it in llvm/cmake/modules/CopyLLVMFiles.cmake, but my normal methods of including don't seem to work in clang-doc. Likely I'm just holding that part wrong, but I don't see anything in clang-tools-extra using include(AddLLVM) or some other module.

Happy to refactor if you have some other suggestions.

DEPENDS ${out_files}
COMMENT "Copying Clang-Doc Assets"
)
set_target_properties(copy-clang-doc-assets PROPERTIES FOLDER "Clang-Doc/Assets")
add_dependencies(clang-doc copy-clang-doc-assets)
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