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Use versioning consistent with the Makefile in CMake

This uses git to determine the dirty version and uses a fallback
if that's not available.

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -59,10 +59,18 @@

   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -pedantic")

 endif()

+# Use versioning consistent with Makefile

+# the git revision is used but uses the fallback in an archive

+

+execute_process(COMMAND git describe --tags --dirty --always

+                OUTPUT_VARIABLE GIT_REV

+                ERROR_QUIET)

+string(STRIP "${GIT_REV}" GIT_REV)

+

 if(CMAKE_VERSION VERSION_LESS 3.12)

-  add_definitions(-DBUILD_VERSION_STRING="${PROJECT_VERSION}")

+  add_definitions(-DBUILD_VERSION_STRING="${GIT_REV}")

 else()

-  add_compile_definitions(BUILD_VERSION_STRING="${PROJECT_VERSION}")

+  add_compile_definitions(BUILD_VERSION_STRING="${GIT_REV}")

 endif()

 set(CMAKE_C_STANDARD 11)