Make cmake pass command line variable to compiler

Question

I have following code:

int main() { #ifdef COMMIT_VERSION cout << "app version: " << COMMIT_VERSION << endl; #endif }

I would like to invoke cmake such that it passes COMMIT_VERSION variable defined on command line to g++ and thus to my application. E.g. following invocation:

cmake -WHAT_IS_THE_OPTION_NAME COMMIT_VERSION='"Hello Version"' make ./a.out

produces output

app version: Hello Version

Due to quite convoluted build system. I would prefer not to use files just command line argument passing. — Trismegistos
– Trismegistos, Commented Aug 8, 2014 at 16:08
Perhaps related (or a duplicate): stackoverflow.com/q/7900661/417197 — André
– André, Commented Aug 11, 2014 at 5:51

Drew McGowen · Accepted Answer · 2014-08-08 16:13:47Z

You can use the -D <var>:<type>=<value> option to add a definition within the cmake script (type and value being optional), like so:

cmake -D COMMIT_VERSION='"whatever version here"' ...

Then, inside the script, you can use the add_definitions function to pass the definition to g++:

add_definitions(-DCOMMIT_VERSION=${COMMIT_VERSION})

Using this solution I would have to provide COMMIT_VERSION to cmake as I previously wanted. It turned out that it would be more suitable if I could provide COMMIT_VERSION to make instead of cmake. Is it possible with cmake?

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