luajit-cmake: Permit absence of git command

Signed-off-by: Hiroshi Hatake <[email protected]>
fluent · Jul 5, 2024 · 7ee1b35 · 7ee1b35
1 parent a1c5d79
commit 7ee1b35
Showing 1 changed file with 20 additions and 3 deletions.
diff --git a/lib/luajit-cmake/LuaJIT.cmake b/lib/luajit-cmake/LuaJIT.cmake
@@ -408,11 +408,28 @@ if (CMAKE_HOST_SYSTEM_NAME STREQUAL "Windows")
   set(GIT_FORMAT %%ct)
 endif()
 
-add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/luajit_relver.txt
-  COMMAND git show -s --format=${GIT_FORMAT} > ${CMAKE_CURRENT_BINARY_DIR}/luajit_relver.txt
-  WORKING_DIRECTORY ${LUAJIT_DIR}
+execute_process(
+  COMMAND git --version
+  RESULT_VARIABLE GIT_EXISTENCE
+  OUTPUT_VARIABLE GIT_VERSION
+  OUTPUT_STRIP_TRAILING_WHITESPACE
 )
 
+if (GIT_EXISTENCE EQUAL 0)
+  message(STATUS "Using Git: ${GIT_VERSION}")
+  add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/luajit_relver.txt
+    COMMAND git show -s --format=${GIT_FORMAT} > ${CMAKE_CURRENT_BINARY_DIR}/luajit_relver.txt
+    WORKING_DIRECTORY ${LUAJIT_DIR}
+  )
+else()
+  string(TIMESTAMP current_epoch "%s")
+  message(STATUS "Using current epoch: ${current_epoch}")
+  add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/luajit_relver.txt
+    COMMAND echo "${current_epoch}" > ${CMAKE_CURRENT_BINARY_DIR}/luajit_relver.txt
+    WORKING_DIRECTORY ${LUAJIT_DIR}
+   )
+endif()
+
 add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/luajit.h
   COMMAND ${HOST_WINE} ${MINILUA_PATH} ${LUAJIT_DIR}/src/host/genversion.lua
   ARGS ${LUAJIT_DIR}/src/luajit_rolling.h