[CMake] Execute CMake process not working: source directory confusion

Thu Sep 28 12:36:14 EDT 2017

Hi Michael.

On 28 September 2017 at 18:18, Michael Powell <mwpowellhtx at gmail.com> wrote:

> On Thu, Sep 28, 2017 at 12:06 PM, Michael Powell <mwpowellhtx at gmail.com>
> wrote:
> > ---------- Forwarded message ----------
> > From: Michael Powell <mwpowellhtx at gmail.com>
> > Date: Thu, Sep 28, 2017 at 12:06 PM
> > Subject: Execute CMake process not working: source directory confusion
> > To: cmake at cmake.org
> >
> >
> > Hello,
> >
> > This is fairly long, but this is intentional. I message the "Invoking"
> message.
>
> Ah, I figured it out!
>
> From the help:
>
> cmake [options] <path-to-source>
>
> So I simply tacked on a "\"${GIT_SUBMODULE_NNG_REPO_DIR}\"" where
> <path-to-source> was expected.
>
> Curious CMake would "see" the ENTIRE argument string as
> "path-to-source" though. Not sure quite what's going on with that,
> though.
>

That's because you're constructing CPPNNG_NNG_CMAKE_OPTIONS as a single
string containing spaces. Spaces *in strings* do not delimit CMake
arguments, even if spaces in CMake file syntax do. In other words:

 foo(a b c)

calls 'foo' with 3 arguments: "a", "b", and "c".

 set(args a b c)
 foo(${args})

also calls 'foo' with these 3 arguments.

However,

  set(args "a b c")
  foo(${args})

calls 'foo' with only ONE argument: the string "a b c".

You need to drop one level of quoting inside your cppnng_nng_add_* macros.

>
> The outcome wasn't quite what I expected. How do I specify "path to
> source", where the source CMakeLists.txt is, properly. And the path to
> the build, where I want the build environment to land?
>
> With this scenario, currently things are landing "in the source
> directory", which is incorrect, not what I am expecting.
>

Once you solve the quoting issue, you should be able to pass what you want
as the source directory. It's effectively the first non-option argument to
'cmake'.

The generated buildsystem lands in the working directory from which cmake
was invoked. So what you want is this:

execute_process(
  ${CMAKE_COMMAND} ${CPPNNG_NNG_CMAKE_OPTIONS} ${GIT_SUBMODULE_NNG_REPO_DIR}
  WORKING_DIRECTORY wherever/you/want/the/buildystem/to/end/up
)

Petr

>
> Probably my confusion over, prefix directory? Or is "source" directory
> where things actually land?
>
> Thanks!
>
> > Invoking CMake: C:/Dev/CMake/bin/cmake.exe -G "Visual Studio 14 2015
> > Win64" -D CMAKE_CONFIGURATION_TYPES:STRING="Debug;Release;
> MinSizeRel;RelWithDebInfo"
> > -D CMAKE_INSTALL_PREFIX:STRING="G:/Source/Spikes/nanomsg/
> cppnngswig-testing/build/nng"
> > -D NNG_ENABLE_COVERAGE:BOOL=OFF -D NNG_ENABLE_DOC:BOOL=OFF -D
> > NNG_ENABLE_NNGCAT:BOOL=OFF -D NNG_ENABLE_TESTS:BOOL=OFF -D
> > NNG_ENABLE_TOOLS:BOOL=OFF -D NNG_ENABLE_ZEROTIER:BOOL=OFF
> >
> > Prior to running:
> >
> > execute_process (
> >     COMMAND "${CMAKE_COMMAND}" ${CPPNNG_NNG_CMAKE_OPTIONS}
> >     WORKING_DIRECTORY "${GIT_SUBMODULE_NNG_REPO_DIR}"
> >     RESULT_VARIABLE CPPNN_NNG_CONFIG_EC
> >     OUTPUT_VARIABLE CPPNN_NNG_CONFIG_MSG
> > )
> >
> > Which is yielding:
> >
> > CMake Error: The source directory
> > "G:/Source/Spikes/nanomsg/cppnngswig-testing/repos/nng/ -G "Visual
> > Studio 14 2015 Win64" -D
> > CMAKE_CONFIGURATION_TYPES:STRING="Debug;Release;
> MinSizeRel;RelWithDebInfo"
> > -D CMAKE_INSTALL_PREFIX:STRING="G:/Source/Spikes/nanomsg/
> cppnngswig-testing/build/nng"
> > -D NNG_ENABLE_COVERAGE:BOOL=OFF -D NNG_ENABLE_DOC:BOOL=OFF -D
> > NNG_ENABLE_NNGCAT:BOOL=OFF -D NNG_ENABLE_TESTS:BOOL=OFF -D
> > NNG_ENABLE_TOOLS:BOOL=OFF -D NNG_ENABLE_ZEROTIER:BOOL=OFF" does not
> > exist.
> >
> > The GIT_SUBMODULE_NNG_REPO_DIR is indeed set to
> > G:/Source/Spikes/nanomsg/cppnngswig-testing/repos/nng/, so how can
> > that not be the source directory? But further, how is it seeing the
> > rest of the options as "source directory"?
> >
> > I only got to this point by doing what seems like extreme string
> > gymnastics just to arrive at what I think is an appropriate command.
> >
> > i.e.
> >
> > macro (cppnng_nng_add_cmake_generator GEN)
> >     set (CPPNNG_NNG_CMAKE_OPTIONS "${CPPNNG_NNG_CMAKE_OPTIONS} -G
> \"${GEN}\"")
> > endmacro ()
> >
> > macro (cppnng_nng_add_cmake_var OPT TYPE VALUE)
> >     set (CPPNNG_NNG_CMAKE_OPTIONS "${CPPNNG_NNG_CMAKE_OPTIONS} -D
> > ${OPT}:${TYPE}=${VALUE}")
> > endmacro ()
> >
> >     cppnng_nng_add_cmake_generator ("${CMAKE_GENERATOR}")
> >
> >     # This is like string GYMNASTICS in order to allow semi-colons to
> > properly pass through.
> >     string(REPLACE ";" "\;" REPLACED_TYPES "${CMAKE_CONFIGURATION_TYPES}"
> )
> >     cppnng_nng_add_cmake_var ("CMAKE_CONFIGURATION_TYPES" STRING
> > "\"${REPLACED_TYPES}\"")
> >
> >     cppnng_nng_add_cmake_var ("CMAKE_INSTALL_PREFIX" STRING
> > "\"${cppnng_SOURCE_DIR}/build/nng\"")
> >     cppnng_nng_add_cmake_var ("NNG_ENABLE_COVERAGE" BOOL OFF)
> >     cppnng_nng_add_cmake_var ("NNG_ENABLE_DOC" BOOL OFF)
> >     cppnng_nng_add_cmake_var ("NNG_ENABLE_NNGCAT" BOOL OFF)
> >     cppnng_nng_add_cmake_var ("NNG_ENABLE_TESTS" BOOL OFF)
> >     cppnng_nng_add_cmake_var ("NNG_ENABLE_TOOLS" BOOL OFF)
> >     # TODO: TBD: at the moment we do not care about ZeroTier, but this
> > could change moving forward.
> >     cppnng_nng_add_cmake_var ("NNG_ENABLE_ZEROTIER" BOOL OFF)
> >
> >     # message (FATAL_ERROR "options: ${CPPNNG_NNG_CMAKE_OPTIONS}")
> >
> >     # message (STATUS "${REPLACED_TYPES}")
> >
> >     message (STATUS "Invoking CMake: " "${CMAKE_COMMAND}"
> > ${CPPNNG_NNG_CMAKE_OPTIONS})
> >
> > Cheers,
> >
> > Michael Powell
> --
>
> Powered by www.kitware.com
>
> Please keep messages on-topic and check the CMake FAQ at:
> http://www.cmake.org/Wiki/CMake_FAQ
>
> Kitware offers various services to support the CMake community. For more
> information on each offering, please visit:
>
> CMake Support: http://cmake.org/cmake/help/support.html
> CMake Consulting: http://cmake.org/cmake/help/consulting.html
> CMake Training Courses: http://cmake.org/cmake/help/training.html
>
> Visit other Kitware open-source projects at http://www.kitware.com/
> opensource/opensource.html
>
> Follow this link to subscribe/unsubscribe:
> http://public.kitware.com/mailman/listinfo/cmake
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/cmake/attachments/20170928/5c8a158a/attachment-0001.html>