Question

I am wondering if it is possible for CMake to run tests like one might run with a configure script. Specifically I want to test if the system I am compiling on has support for the rdtscp instruction.

I am using Linux and if I were using a configure script I could do something like:

cat /proc/cpuinfo | head -n 19 | tail -1 | grep -c rdtscp

which would give me 0 if the rdtscp feature was not present or a 1 if it were. I could then use this to determine whether to #define RDTSCP. I’m wondering if it’s possible to do something similar with CMake even if it’s not completely portable (I’m only running under Linux I’m not using Visual Studio, etc.).

Answer 1

execute_process(COMMAND cat /proc/cpuinfo
    COMMAND head -n 19
    COMMAND tail -1
    COMMAND grep -c rdtscp
    OUTPUT_VARIABLE OUT)