How do I add revision and build date to source?
My goal is simple to be able to do something like this on startup:
printf("Test app build on %s, revision %d", BUILD_DATE, REVISION)
For building I’m using make with a simple Makefile.inc, not autoconf or anything like this.
2 Solutions collect form web for “How do I add revision and build date to source?”
I ended up using a simple command like this in my
echo "#define GIT_REF \"`git show-ref refs/heads/master | cut -d " " -f 1 | cut -c 31-40`\"" > git_ref.h
RCS keyword substitution is not natively supported by Git, but can be added with a
gitattributes filter driver: See “Git equivalent of subversion’s $URL$ keyword expansion”.
For example (not exactly relate to your question, but illustrates the general principle):
git config filter.rcs-keyword.clean 'perl -pe "s/\\\$Date[^\\\$]*\\\$/\\\$Date\\\$/"' git config filter.rcs-keyword.smudge 'perl -pe "s/\\\$Date[^\\\$]*\\\$/\\\$Date: `date`\\\$/"'
You will base your filter script on the result of
git describe --tags called from your Makefile.
As mentioned in this answer to “Git equivalent of subversion’s $URL$ keyword expansion”, smudge/clear filter driver is not a perfect solution, and adding any kind of meta-data directly in the data (source) is generally a bad idea (you have a debate about it in “What are the basic clearcase concepts every developer should know?”).
Yet you have a good example of such Git keyword expansion in this answer in “How do I enable ident string for Git repos?”.