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build: avoid unnecessary dependencies on generated headers

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This prevents the generation of these headers from also depending on the
dependencies of the libs/binaries which consume them.

Specifically, this prevents generated test headers (such as
test/data/base58_encode_decode.json.h) from depending on the
dependencies of test_bitcoin (libcrc32c.a libcrc32c_sse42.a libleveldb.a)

Note that this is currently only relevant for Ninja.

For more detail, see:
https://cmake.org/cmake/help/latest/command/add_custom_command.html
This commit is contained in:
Cory Fields 2024-09-16 17:16:52 +00:00
parent 8fa10edcd1
commit c4e498300c
1 changed files with 8 additions and 0 deletions
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8
cmake/module/GenerateHeaders.cmake
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@ -2,12 +2,19 @@
# Distributed under the MIT software license, see the accompanying # Distributed under the MIT software license, see the accompanying
# file COPYING or https://opensource.org/license/mit/. # file COPYING or https://opensource.org/license/mit/.
if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.27)
set(DEPENDS_EXPLICIT_OPT DEPENDS_EXPLICIT_ONLY)
else()
set(DEPENDS_EXPLICIT_OPT)
endif()
function(generate_header_from_json json_source_relpath) function(generate_header_from_json json_source_relpath)
add_custom_command( add_custom_command(
OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${json_source_relpath}.h OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${json_source_relpath}.h
COMMAND ${CMAKE_COMMAND} -DJSON_SOURCE_PATH=${CMAKE_CURRENT_SOURCE_DIR}/${json_source_relpath} -DHEADER_PATH=${CMAKE_CURRENT_BINARY_DIR}/${json_source_relpath}.h -P ${PROJECT_SOURCE_DIR}/cmake/script/GenerateHeaderFromJson.cmake COMMAND ${CMAKE_COMMAND} -DJSON_SOURCE_PATH=${CMAKE_CURRENT_SOURCE_DIR}/${json_source_relpath} -DHEADER_PATH=${CMAKE_CURRENT_BINARY_DIR}/${json_source_relpath}.h -P ${PROJECT_SOURCE_DIR}/cmake/script/GenerateHeaderFromJson.cmake
DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${json_source_relpath} ${PROJECT_SOURCE_DIR}/cmake/script/GenerateHeaderFromJson.cmake DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${json_source_relpath} ${PROJECT_SOURCE_DIR}/cmake/script/GenerateHeaderFromJson.cmake
VERBATIM VERBATIM
${DEPENDS_EXPLICIT_OPT}
) )
endfunction() endfunction()
@ -17,5 +24,6 @@ function(generate_header_from_raw raw_source_relpath raw_namespace)
COMMAND ${CMAKE_COMMAND} -DRAW_SOURCE_PATH=${CMAKE_CURRENT_SOURCE_DIR}/${raw_source_relpath} -DHEADER_PATH=${CMAKE_CURRENT_BINARY_DIR}/${raw_source_relpath}.h -DRAW_NAMESPACE=${raw_namespace} -P ${PROJECT_SOURCE_DIR}/cmake/script/GenerateHeaderFromRaw.cmake COMMAND ${CMAKE_COMMAND} -DRAW_SOURCE_PATH=${CMAKE_CURRENT_SOURCE_DIR}/${raw_source_relpath} -DHEADER_PATH=${CMAKE_CURRENT_BINARY_DIR}/${raw_source_relpath}.h -DRAW_NAMESPACE=${raw_namespace} -P ${PROJECT_SOURCE_DIR}/cmake/script/GenerateHeaderFromRaw.cmake
DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${raw_source_relpath} ${PROJECT_SOURCE_DIR}/cmake/script/GenerateHeaderFromRaw.cmake DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${raw_source_relpath} ${PROJECT_SOURCE_DIR}/cmake/script/GenerateHeaderFromRaw.cmake
VERBATIM VERBATIM
${DEPENDS_EXPLICIT_OPT}
) )
endfunction() endfunction()