CODEWITHSUNDEEP
c++cmake
Black
Black

Reputation: 332

How to use result of FILE(GLOB_RECURSE) in EXECUTE_PROCESS?

I am currently mentally broken by the CMake. Let me first show you what I am working on:

FILE( GLOB_RECURSE FLATBUFFER_SRC "*.fbs" )
STRING( REPLACE ";" " " FLATBUFFER_SRC_STR "${FLATBUFFER_SRC}" )

SET( FLATC_COMMAND "flatc --cpp --gen-mutable -o ${META_INSTALL_LOCATION} ${FLATBUFFER_SRC_STR}" )
MESSAGE( STATUS "${FLATC_COMMAND}" )

EXECUTE_PROCESS(
        COMMAND ${FLATC_COMMAND}
        RESULT_VARIABLE OUT
)

IF ( NOT ${OUT} EQUAL "0" )
    MESSAGE( STATUS "COMMAND EXIT WITH: ${OUT}" )
    MESSAGE( STATUS "META_INSTALL_LOCATION: ${META_INSTALL_LOCATION}" )
    MESSAGE( STATUS "FLATBUFFER_SRC_STR: ${FLATBUFFER_SRC_STR}" )
    MESSAGE( FATAL_ERROR "flatc has FAILED gracefully" )
ENDIF ()

And here is an output:

-- flatc --cpp --gen-mutable -o /home/black/Work/hubris/meta /home/black/Work/hubris/cmake-build-debug/META-prefix/src/META/fbs/game/base.fbs /home/black/Work/hubris/cmake-build-debug/META-prefix/src/META/fbs/game/util/vec.fbs
-- Configuring done
-- COMMAND EXIT WITH: No such file or directory
-- META_INSTALL_LOCATION: /home/black/Work/hubris/meta
-- FLATBUFFER_SRC_STR: /home/black/Work/hubris/cmake-build-debug/META-prefix/src/META/fbs/game/base.fbs /home/black/Work/hubris/cmake-build-debug/META-prefix/src/META/fbs/game/util/vec.fbs
CMake Error at CMakeLists.txt:20 (MESSAGE):
  flatc has FAILED gracefully

While my question is "Why does it not work?" and it will stay the same, I am looking to understand ways of CMake. When I run in shell printed command: 

flatc --cpp --gen-mutable -o /home/black/Work/hubris/meta /home/black/Work/hubris/cmake-build-debug/META-prefix/src/META/fbs/game/base.fbs /home/black/Work/hubris/cmake-build-debug/META-prefix/src/META/fbs/game/util/vec.fbs

It works like a dream. I am really confused and wasted a lot of time. Could anyone explain to me, what I have done horrendously wrong?

Upvotes: 1

Views: 397

Answers (1)

Tsyvarev
Tsyvarev

Reputation: 65928

Result of FILE(GLOB_RECURSE) is a list, and exactly a list is expected by CMake when you specify arguments for a COMMAND. So, just pass this list to execute_process, without any modifications and without quoting:

FILE( GLOB_RECURSE FLATBUFFER_SRC "*.fbs" )

SET( FLATC_COMMAND flatc --cpp --gen-mutable -o ${META_INSTALL_LOCATION} ${FLATBUFFER_SRC} )

EXECUTE_PROCESS(
        COMMAND ${FLATC_COMMAND}
        RESULT_VARIABLE OUT
)

or, by removing intermediate FLATC_COMMAND variable:

FILE( GLOB_RECURSE FLATBUFFER_SRC "*.fbs" )

EXECUTE_PROCESS(
        COMMAND flatc --cpp --gen-mutable -o ${META_INSTALL_LOCATION} ${FLATBUFFER_SRC}
        RESULT_VARIABLE OUT
)

Upvotes: 2

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