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Only regenerate emscripten version files when git state changes

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Replace add_custom_target(ALL) with add_custom_command(OUTPUT) so the
version script only runs when .git/HEAD or the current branch ref file
changes, instead of on every build.
This commit is contained in:
Christian Semmler 2026-04-04 09:17:16 -07:00
parent 09d8360370
commit 2a55d065f9
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GPG Key ID: 086DAA1360BEEE5C
1 changed files with 24 additions and 2 deletions
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26
CMakeLists.txt
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@ -18,10 +18,32 @@ if (EMSCRIPTEN)
set(SDL_PTHREADS ON CACHE BOOL "Enable SDL pthreads" FORCE)
find_program(LLVM_OBJCOPY_BIN NAMES llvm-objcopy HINTS "${EMSCRIPTEN_ROOT_PATH}/../bin" REQUIRED)
set(ISLE_EMSCRIPTEN_VERSION_DIR "${CMAKE_BINARY_DIR}/generated")
add_custom_target(emscripten_version ALL
# Resolve git HEAD to find file dependencies for change detection.
# .git/HEAD changes on branch switch; the ref file it points to changes on commit.
set(_git_head "${CMAKE_SOURCE_DIR}/.git/HEAD")
set(_git_deps "${_git_head}")
if(EXISTS "${_git_head}")
file(READ "${_git_head}" _head_ref)
string(STRIP "${_head_ref}" _head_ref)
if(_head_ref MATCHES "^ref: (.+)$")
set(_git_ref "${CMAKE_SOURCE_DIR}/.git/${CMAKE_MATCH_1}")
if(EXISTS "${_git_ref}")
list(APPEND _git_deps "${_git_ref}")
endif()
endif()
endif()
add_custom_command(
OUTPUT ${ISLE_EMSCRIPTEN_VERSION_DIR}/version.js ${ISLE_EMSCRIPTEN_VERSION_DIR}/sourceMappingURL
COMMAND ${CMAKE_COMMAND} -DSOURCE_DIR=${CMAKE_SOURCE_DIR} -DOUTPUT_DIR=${ISLE_EMSCRIPTEN_VERSION_DIR}
-P ${CMAKE_SOURCE_DIR}/CMake/EmscriptenVersion.cmake
BYPRODUCTS ${ISLE_EMSCRIPTEN_VERSION_DIR}/version.js ${ISLE_EMSCRIPTEN_VERSION_DIR}/sourceMappingURL
DEPENDS ${_git_deps}
COMMENT "Generating emscripten version files"
)
add_custom_target(emscripten_version DEPENDS
${ISLE_EMSCRIPTEN_VERSION_DIR}/version.js
${ISLE_EMSCRIPTEN_VERSION_DIR}/sourceMappingURL
)
endif()