mirror of
https://github.com/ZDoom/gzdoom-gles.git
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8e2a21fbfb
The benefit to this is fairly small, but it does mean a little less work needs to be done in the build scripts for cross compiling. The C version wasn't especially concise so it was not obviously better in any way.
91 lines
2.3 KiB
CMake
Executable file
91 lines
2.3 KiB
CMake
Executable file
#!/usr/bin/cmake -P
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# UpdateRevision.cmake
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#
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# Public domain. This program uses git commands command to get
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# various bits of repository status for a particular directory
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# and writes it into a header file so that it can be used for a
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# project's versioning.
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# Boilerplate to return a variable from a function.
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macro(ret_var VAR)
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set(${VAR} "${${VAR}}" PARENT_SCOPE)
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endmacro()
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# Populate variables "Hash", "Tag", and "Timestamp" with relevant information
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# from source repository. If anything goes wrong return something in "Error."
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function(query_repo_info)
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execute_process(
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COMMAND git describe --tags --dirty=-m
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RESULT_VARIABLE Error
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OUTPUT_VARIABLE Tag
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ERROR_QUIET
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OUTPUT_STRIP_TRAILING_WHITESPACE
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)
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if(NOT "${Error}" STREQUAL "0")
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ret_var(Error)
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return()
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endif()
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execute_process(
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COMMAND git log -1 "--format=%ai;%H"
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RESULT_VARIABLE Error
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OUTPUT_VARIABLE CommitInfo
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ERROR_QUIET
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OUTPUT_STRIP_TRAILING_WHITESPACE
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)
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if(NOT "${Error}" STREQUAL "0")
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ret_var(Error)
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return()
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endif()
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list(GET CommitInfo 0 Timestamp)
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list(GET CommitInfo 1 Hash)
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ret_var(Tag)
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ret_var(Timestamp)
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ret_var(Hash)
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endfunction()
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# Although configure_file doesn't overwrite the file if the contents are the
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# same we can't easily observe that to change the status message. This
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# function parses the existing file (if it exists) and puts the hash in
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# variable "OldHash"
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function(get_existing_hash File)
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if(EXISTS "${File}")
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file(STRINGS "${File}" OldHash LIMIT_COUNT 1)
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if(OldHash)
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string(SUBSTRING "${OldHash}" 3 -1 OldHash)
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ret_var(OldHash)
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endif()
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endif()
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endfunction()
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function(main)
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if(NOT CMAKE_ARGC EQUAL 4) # cmake -P UpdateRevision.cmake <OutputFile>
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message("Usage: ${CMAKE_ARGV2} <path to gitinfo.h>")
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return()
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endif()
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set(OutputFile "${CMAKE_ARGV3}")
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get_filename_component(ScriptDir "${CMAKE_SCRIPT_MODE_FILE}" DIRECTORY)
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query_repo_info()
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if(NOT Hash)
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message("Failed to get commit info: ${Error}")
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set(Hash "0")
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set(Tag "<unknown version>")
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set(Timestamp "")
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endif()
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get_existing_hash("${OutputFile}")
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if(Hash STREQUAL OldHash)
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message("${OutputFile} is up to date at commit ${Tag}.")
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return()
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endif()
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configure_file("${ScriptDir}/gitinfo.h.in" "${OutputFile}")
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message("${OutputFile} updated to commit ${Tag}.")
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endfunction()
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main()
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