How to store and output git version information in a CMake code

storing-git-version-doc.txt

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CMakeLists.txt:

add_custom_target(git_version.h
        COMMAND 
            ${CMAKE_CURRENT_SOURCE_DIR}/git_version.sh ${CMAKE_CURRENT_BINARY_DIR}/git_version.h)

add_dependencies(<exe> git_version.h)

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git-version.sh:

#!/bin/bash

outfile=$1
tmpfile=${outfile}.tmp

version=$(git describe --dirty)
cat >$tmpfile <<EOF
#pragma once
#define GIT_VERSION "$version"
EOF

if [ -r $outfile ]; then
    if diff -q $outfile $tmpfile >/dev/null; then
        # No change to version
        exit 0
    fi
fi

mv $tmpfile $outfile

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main.cc:

#include "git_version.h"

printf("<code name> version: %s\n", GIT_VERSION);

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