I can not get environment at custom target shell

Question

I can not get environment at custom target shell.

CMakeList.txt

set( ENV{TEST_VAR} "Hello" )
add_custom_target( test 
    COMMAND ./test.sh
    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}  )

test.sh

echo test:${TEST_VAR}

when try to "make test", shell can't get ${TEST_VAR}.

Thank you.

Answer 1

You have to use a trick because environment variables SET in the CMakeLists.txt only take effect for cmake itself, so you cannot use this method to set an environment variable that a custom command might need:

test.cmake

set( ENV{TEST_VAR} "Hello" )
execute_process(
    COMMAND ./test.sh
    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}  )

CMakeLists.txt

add_custom_target( test
    COMMAND ${CMAKE_COMMAND} -P test.cmake )