cmake: gen_version_h: add commit hash as integer

Include the first 32 bits of the git commit hash into the generated
version files in integer form. This can be an easier form to work with
than the `APP_BUILD_VERSION` define, which includes a superset of the
same information but in string form.

Signed-off-by: Jordan Yates <[email protected]>

Author: JordanYates

cmake/gen_version_h.cmake

@@ -18,6 +18,10 @@ if(NOT DEFINED ${BUILD_VERSION_NAME})
   git_describe(${work_dir} ${BUILD_VERSION_NAME})
 endif()
 
+git_commit_hash(${work_dir} GIT_COMMIT_HASH)
+git_commit_hash_short("${GIT_COMMIT_HASH}" GIT_COMMIT_HASH_SHORT GIT_COMMIT_HASH_SHORT_UINT32)
+set(GIT_COMMIT_HASH_SHORT_0X "0x${GIT_COMMIT_HASH_SHORT}")
+
 include(${ZEPHYR_BASE}/cmake/modules/version.cmake)
 file(READ ${ZEPHYR_BASE}/version.h.in version_content)
 string(CONFIGURE "${version_content}" version_content)

version.h.in

@@ -19,6 +19,8 @@
 #define @VERSION_TYPE@_VERSION_EXTENDED_STRING  "@@VERSION_TYPE@_VERSION_EXTENDED_STRING@"
 #define @VERSION_TYPE@_VERSION_TWEAK_STRING     "@@VERSION_TYPE@_VERSION_TWEAK_STRING@"
 
+#define @VERSION_TYPE@_GIT_COMMIT_HASH_SHORT    @GIT_COMMIT_HASH_SHORT_0X@
+
 #define @BUILD_VERSION_NAME@ @@BUILD_VERSION_NAME@@
 @@VERSION_TYPE@_VERSION_CUSTOMIZATION@