I’m using CMake to generate Makefiles under Linux.
I’d like the Makefile to check if an environment variable is set (sort of How to ensure Makefile variable is set as a prerequisite?): I’d like make to generate an error if a mandatory env var is not set (else it fails to compile and it’s hard for the developper to understand why). Obviously, I cannot modify the Makefile by hand to do that, but I’d like this code to be added to the Makefile by CMake.
Is that doable?
1
Same logic except using a CMake script. So the solution is cross-platform.
Created check_env.cmake:
if(NOT DEFINED ENV{VAR_REQUIRED})
message(FATAL_ERROR "VAR_REQUIRED not found!")
endif()
Create a custom target so the check is done at build time:
add_custom_target(check_env ALL
COMMAND ${CMAKE_COMMAND} -P check_env.cmake
)
1
Could finally do this using a custom_target:
Created check_env.cmd:
echo OFF
SetLocal EnableDelayedExpansion
echo Check if environment is setup correctly
if defined ENV_VAR_REQUIRED (
echo ENV_VAR_REQUIRED is defined
) else (
echo Missing ENV_VAR_REQUIRED
exit /b 1
)
Call it upon compilation using a custom target:
add_custom_target(check_env ALL COMMAND check_env.cmd )
1