[SOLVED] Check exit status of `execute_process` in cmake

Issue

In my cmake file i run a command with execute_process. And i want to check if it failed. It doesn't print anything to stderr.

So far I have been using a bash script that runs the command and then checks the exit status with $? == 1.

Is there a way to do something similar with cmake?

execute_process(COMMAND "runThis")
if("{$?}" EQUAL 1)
    message( FATAL_ERROR "Bad exit status")
endif()

I use cmake 3.12.1

Solution

You may find exit status of the executing process by using RESULT_VARIABLE option for execute_process invocation. From option's documentation:

The variable will be set to contain the result of running the processes. This will be an integer return code from the last child or a string describing an error condition.

Example:

execute_process(COMMAND "runThis" RESULT_VARIABLE ret)
if(ret EQUAL "1")
    message( FATAL_ERROR "Bad exit status")
endif()

Answered By - Tsyvarev