How can I pass git SHA1 to compiler as definition using cmake?

Question

In a Makefile this would be done with something like:

g++ -DGIT_SHA1=\"`git log -1 | head -n 1`\" ...

This is very useful, because the bina

Answer 1

I'd use sth. like this in my CMakeLists.txt:

exec_program(
    "git"
    ${CMAKE_CURRENT_SOURCE_DIR}
    ARGS "describe"
    OUTPUT_VARIABLE VERSION )

string( REGEX MATCH "-g.*$" VERSION_SHA1 ${VERSION} )
string( REGEX REPLACE "[-g]" "" VERSION_SHA1 ${VERSION_SHA1} )

add_definitions( -DGIT_SHA1="${VERSION_SHA1}" )