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    <p>In my program, I hold the git version number and the date of the build in a separate file, called <code>version.c</code>, which looks like this:</p> <pre><code>#include "version.h" const char * build_date = "2009-11-10 11:09"; const char * build_git_sha = "6b54ea36e92d4907aba8b3fade7f2d58a921b6cd"; </code></pre> <p>There is also a header file, which looks like this:</p> <pre><code>#ifndef VERSION_H #define VERSION_H extern const char * build_date; /* 2009-11-10 11:09 */ extern const char * build_git_sha; /* 6b54ea36e92d4907aba8b3fade7f2d58a921b6cd */ #endif /* VERSION_H */ </code></pre> <p>Both the header file and the C file are generated by a Perl script which looks like this:</p> <pre class="lang-perl prettyprint-override"><code>my $git_sha = `git rev-parse HEAD`; $git_sha =~ s/\s+//g; # This contains all the build variables. my %build; $build{date} = make_date_time (); $build{git_sha} = $git_sha; hash_to_c_file ("version.c", \%build, "build_"); </code></pre> <p>Here <code>hash_to_c_file</code> does all the work of creating <code>version.c</code> and <code>version.h</code> and <code>make_date_time</code> makes a string as shown.</p> <p>In the main program, I have a routine</p> <pre><code>#include "version.h" // The name of this program. const char * program_name = "magikruiser"; // The version of this program. const char * version = "0.010"; /* Print an ID stamp for the program. */ static void _program_id_stamp (FILE * output) { fprintf (output, "%s / %s / %s / %s\n", program_name, version, build_date, build_git_sha); } </code></pre> <p>I'm not that knowledgeable about git, so I'd welcome comments if there is a better way to do this.</p>
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    1. POHow can I get my C code to automatically print out its Git version hash?
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    1. USStefan Majewsky
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    1. POHow can I get my C code to automatically print out its Git version hash?
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    1. COAs long as there is a way to have the Perl script automatically run or you can always remember to run it, this looks like a really good/sophisticated answer.
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      1. USMatthew
    2. COThe Perl script is part of the build script, which is a "one step build" for everything.
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    3. COThis is good as far as it goes, but do keep in mind that it will report the hash of the latest commit on the branch, not the hash of the code being compiled. If there are uncommitted changes, those will not be apparent.
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      1. USPhil Miller
 

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