how to include git commit-number into a c++ executable?

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i use git as a version tracker for my c++ project.

sometimes i need to repeat a calculation and i would like to know which version of the program i used.

what would be a good way to put a # of the commit into the main executable? in other words. i'd like the program to tell me the # of the current commit in an introductory message as i run the program.

one way i can think of is to make the c++ program lunch "git log" from shell and extract the commit # but i'm not sure how to do it during make.

(I use linux)

makefile git c++
4 Answers

If you're using Qt, put this in your project's .pro file:

win32:DEFINES += GIT_BIN='C:\\Git\\bin\\git'
# or 'C:\\Progra~1\\Git\\bin\\git' - ymmv with putting spaces in here
win32:DEFINES += GIT_REVISION='\\"$$system($${GIT_BIN} rev-parse --short HEAD)\\"'
unix:DEFINES += GIT_REVISION='\\"$$system(git rev-parse --short HEAD)\\"'

Then use GIT_REVISION in your code as in the other answers - it behaves as const char *.

(Thanks to Alexander Barthel, who I plundered this tip from.)

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