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cmake: Allow PRODUCT_VERSION to be overridden at build-time

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In packaging systems like Debian's, typically the build will not have
a .git/ directory available; or if it does, the commit ID will be a
downstream packaging commit that means nothing to upstream developers.
However, the packaging can inject a more meaningful version number if
given a way to do so.

Signed-off-by: Simon McVittie <smcv@debian.org>
This commit is contained in:
Simon McVittie 2025-08-20 10:06:06 +01:00 committed by Tim Angus
parent de6e8747ab
commit 03c5ee009d
1 changed files with 12 additions and 10 deletions
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22
CMakeLists.txt
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@ -41,18 +41,20 @@ set(CMAKE_C_STANDARD 99)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(CMAKE_SHARED_LIBRARY_PREFIX "")
set(PRODUCT_VERSION "${CMAKE_PROJECT_VERSION}")
if(NOT PRODUCT_VERSION)
set(PRODUCT_VERSION "${CMAKE_PROJECT_VERSION}")
if(EXISTS "${CMAKE_SOURCE_DIR}/.git")
execute_process(
COMMAND git show -s --pretty=format:%h
WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
OUTPUT_VARIABLE GIT_REV
OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_QUIET)
if(EXISTS "${CMAKE_SOURCE_DIR}/.git")
execute_process(
COMMAND git show -s --pretty=format:%h
WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
OUTPUT_VARIABLE GIT_REV
OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_QUIET)
if(GIT_REV)
set(PRODUCT_VERSION "${PRODUCT_VERSION}_g${GIT_REV}")
if(GIT_REV)
set(PRODUCT_VERSION "${PRODUCT_VERSION}_g${GIT_REV}")
endif()
endif()
endif()