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6aea0f12cd
Properly persist git hash on each build Rebuild `git_hash.h` only when `.git` folder changes `add_custom_target()` always considers its target out-of-date which leads to rebuilding of `git_hash.h` on every build (which is ironically what we wanted) and consequently rebuilding of build_options.c and relinking of c3c even when no changes are made, which is mildly annoying. We are replacing `add_custom_target()` with `add_custom_command()` which depends on `.git`, so `git_hash.h` is only rebuilt if any git commands are performed. Which is less annoying. In case of no `.git` we simply do not depend on it which leads to `git_hash.h` being rebuilt only once.
15 lines
452 B
CMake
15 lines
452 B
CMake
find_package(Git QUIET)
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set(GIT_HASH "unknown")
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if(GIT_FOUND AND EXISTS "${CMAKE_CURRENT_LIST_DIR}/.git")
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execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse HEAD
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OUTPUT_VARIABLE GIT_HASH
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OUTPUT_STRIP_TRAILING_WHITESPACE
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COMMAND_ERROR_IS_FATAL ANY)
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endif()
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message("Git Hash: ${GIT_HASH}")
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file(WRITE ${CMAKE_BINARY_DIR}/git_hash.h "#pragma once\n#define GIT_HASH \"${GIT_HASH}\"\n")
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