How to build executable with a compiler from ExternalProject

Question

I have an external project that generates a compiler

include(ExternalProject)

ExternalProject_Add(gprolog
        GIT_REPOSITORY    "[email protected]:didoudiaz/gprolog.git"
        GIT_TAG           "master"
        SOURCE_DIR        "${CMAKE_SOURCE_DIR}/3rdparty/gprolog"
        BUILD_IN_SOURCE   true
        CONFIGURE_COMMAND cd src && ./configure --with-install-dir=${CMAKE_SOURCE_DIR}/3rdparty/gprolog-build
        BUILD_COMMAND     cd src && make
        INSTALL_COMMAND   cd src && make install
)

Consequently, I'd like to run:

add_executable(runner src/runner.c app/application.pro)
include_directories(runner "${CMAKE_SOURCE_DIR}/3rdparty/gprolog-build/include")

but instead of gcc or clang, I need to use ${CMAKE_SOURCE_DIR}/3rdparty/gprolog-build/bin/gplc.

When I politely ask CMake to pretend that gplc is just another C compiler by adding

set(CMAKE_C_COMPILER "${CMAKE_SOURCE_DIR}/3rdparty/gprolog-build/bin/gplc")

it screams at me with

Cannot get compiler information:
    Compiler exited with error code 1: .../gprolog/3rdparty/gprolog-build/bin/gplc -xc -g -isysroot ..../Developer/SDKs/MacOSX11.3.sdk -fpch-preprocess -v -dD -E
    Apple clang version 12.0.5 (clang-1205.0.22.11)
    Target: x86_64-apple-darwin20.5.0
    Thread model: posix
    InstalledDir: .../XcodeDefault.xctoolchain/usr/bin
    clang: warning: -lm: 'linker' input unused [-Wunused-command-line-argument]
    clang: error: cannot specify -o when generating multiple output files
    compilation failed

Might be worth a feature request to support the gplc compiler. — Alex Reinking
– Alex Reinking, Commented Aug 18, 2021 at 1:19

Alex Reinking · Accepted Answer · 2021-08-17 18:19:39Z

1

Short of reverse engineering CMake's enable_language implementation modules to add your own for Prolog, you can always go the route of add_custom_command and ask your compiler to generate object files, which can be included as sources in the add_executable command.

If you add some detail to the question about how the Prolog compiler works, I can help you write the custom commands.

answered Aug 17, 2021 at 18:19

Alex Reinking

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2 Comments

vasily Over a year ago

I've pushed example code here: github.com/vasily-kartashov/gprolog-cmake

Alex Reinking Over a year ago

I got it to work on my Ubuntu machine by providing an appropriate toolchain file and overrides file. See my PR here: github.com/vasily-kartashov/gprolog-cmake/pull/1/files

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