linux - CMake: how to use if condition in add_custom_command(...) -

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i want use linux if condition in cmakelists.txt add_custom_command(...) need run these if condition , judgement in makefile. this: 

cmake_minimum_required(version 2.8) add_custom_target(temp_target all) add_custom_command(target temp_target                    pre_build                    command if ["a" != "b"]; echo 1; fi;                    verbatim )

what should if want use 

if ["a" != "b"]; echo 1; fi;

when make makefile? lot help!

you may specify one-line shell code using /bin/sh -c command argument:

command /bin/sh -c "if [ 'a' != 'b' ]; echo 1; fi;"

note, [ extension of bash, may unknown simple shells "dash".


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