1# CMake script that writes version control information to a header.
2#
3# Input variables:
4#   NAMES             - A list of names for each of the source directories.
5#   <NAME>_SOURCE_DIR - A path to source directory for each name in NAMES.
6#   HEADER_FILE       - The header file to write
7#
8# The output header will contain macros <NAME>_REPOSITORY and <NAME>_REVISION,
9# where "<NAME>" is substituted with the names specified in the input variables,
10# for each of the <NAME>_SOURCE_DIR given.
11
12get_filename_component(LLVM_CMAKE_DIR "${CMAKE_SCRIPT_MODE_FILE}" PATH)
13
14list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_DIR}")
15
16include(VersionFromVCS)
17
18# Handle strange terminals
19set(ENV{TERM} "dumb")
20
21function(append_info name path)
22  if(path)
23    get_source_info("${path}" revision repository)
24  endif()
25  if(revision)
26    file(APPEND "${HEADER_FILE}.tmp"
27      "#define ${name}_REVISION \"${revision}\"\n")
28  else()
29    file(APPEND "${HEADER_FILE}.tmp"
30      "#undef ${name}_REVISION\n")
31  endif()
32  if(repository)
33    file(APPEND "${HEADER_FILE}.tmp"
34      "#define ${name}_REPOSITORY \"${repository}\"\n")
35  else()
36    file(APPEND "${HEADER_FILE}.tmp"
37      "#undef ${name}_REPOSITORY\n")
38  endif()
39endfunction()
40
41foreach(name IN LISTS NAMES)
42  if(NOT DEFINED ${name}_SOURCE_DIR)
43    message(FATAL_ERROR "${name}_SOURCE_DIR is not defined")
44  endif()
45  append_info(${name} "${${name}_SOURCE_DIR}")
46endforeach()
47
48# Copy the file only if it has changed.
49execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
50  "${HEADER_FILE}.tmp" "${HEADER_FILE}")
51file(REMOVE "${HEADER_FILE}.tmp")
52