[CMake] Spaces in a command

[Iosif Neitzke]

"If VERBATIM is given then all arguments to the commands will be
escaped properly for the build tool so that the invoked command
receives each argument unchanged. Note that one level of escapes is
still used by the CMake language processor before add_custom_command
even sees the arguments. Use of VERBATIM is recommended as it enables
correct behavior. When VERBATIM is not given the behavior is platform
specific because there is no protection of tool-specific special
characters."

http://www.cmake.org/cmake/help/v3.0/command/add_custom_command.html

On Fri, Jul 25, 2014 at 11:20 AM, Bill Newcomb <bnewcomb at nvidia.com> wrote:
> I want to add stuff to a custom command based on some definition:
>
> cmake_minimum_required(VERSION 2.6)
>
> set(DO_RELAX 1)
> if(DO_RELAX)
>     set(OR_RELAX "|| echo \"no big deal\"")
> else()
>     set(OR_RELAX "")
> endif()
>
> add_custom_command(OUTPUT foo COMMAND generate-foo ${OR_RELAX})
> add_custom_target(do-foo ALL DEPENDS foo)
>
>
> However, this produces the following rule in the generated makefile:
>
> foo:
>         $(CMAKE_COMMAND) -E cmake_progress_report /home/bnewcomb/tmp/cmake-tests/custom-or/CMakeFiles $(CMAKE_PROGRESS_1)
>         @$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --blue --bold "Generating foo"
>         generate-foo ||\ echo\ "no\ big\ deal"
>
> Is there some way I can get cmake to not escape all of the
> spaces in the value of OR_RELAX?
>
> Thanks,
> B.
>
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