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Hello everyone.

I am trying to create a FindAMPL.cmake script, but I am having some problems, In this link I share the first version. Bellow follows my FindAMPL.cmake:

if (AMPL_LIBRARY)
    SET(AMPL_FIND_QUIETLY TRUE)
endif (AMPL_LIBRARY)


IF ( UNIX )
    # target not already created
    if (NOT TARGET ampl)

        # ampl dir
        find_path(AMPL_DIR NAMES "ampl"
            PATHS
            "/opt/ampl/"
            "/opt/AMPL/"
            "~/ampl/"
            "~/AMPL/"
            )

        # edge case
        IF( NOT AMPL_FIND_QUIETLY AND NOT AMPL_DIR)
            message ( "AMPL_DIR not found ")
        ENDIF()

        # amplapi
        set(AMPL_API_DIR "${AMPL_DIR}/amplapi")

        # runpath
        set(CMAKE_INSTALL_RPATH "${AMPL_API_DIR}/lib")
        set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)

        # lib
        set(AMPL_LIBRARY_NAME "ampl")
        add_library(ampl STATIC IMPORTED)
        find_library(AMPL_LIBRARY ${AMPL_LIBRARY_NAME} PATHS ${CMAKE_INSTALL_RPATH})

        # edge case
        if(NOT(AMPL_LIBRARY))
            message(FATAL_ERROR "AMPL library \"${AMPL_LIBRARY_NAME}\" could not be found")
        endif()

        set_target_properties(ampl PROPERTIES
            IMPORTED_LOCATION ${AMPL_LIBRARY}
            INTERFACE_INCLUDE_DIRECTORIES ${AMPL_API_DIR}/include)

    endif ()


    include(FindPackageHandleStandardArgs)
    # handle the QUIETLY and REQUIRED arguments and set LIBAMPL_FOUND to TRUE
    # if all listed variables are TRUE
    find_package_handle_standard_args(AMPL  DEFAULT_MSG AMPL_LIBRARY)

    mark_as_advanced(AMPL_LIBRARY)

ENDIF()

And below follows my CMakeLists.txt:

cmake_minimum_required(VERSION 3.16)
project(AMPLCMake)

##### SETs
set (Project_PATH "${PROJECT_SOURCE_DIR}")
set (CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/support)
set (CMAKE_BUILD_TYPE Release)
set (CMAKE_CXX_STANDARD 20)

set (BUILD_SHARED_LIBS On)

##### Includes
include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
include(${CMAKE_BINARY_DIR}/conan_paths.cmake)
conan_basic_setup()

##### Additional packages

find_package (AMPL)

##### Include Dirs

include_directories(
    SYSTEM
    includes
    "${PROJECT_BINARY_DIR}"
    "${AMPL_LIBRARY}"
    )

##### Compile options

add_compile_options(-Wall
    -DIL_STD
    -Wfatal-errors
    -pedantic
    -fopenmp
    -DDEBUG
    -fdiagnostics-color=always
    -lz
    -std=c++20
    -lm
    #
    -lpthread
    -ldl
    -Wno-sign-compare
    )

file(GLOB_RECURSE SOURCES "src/*.cpp")

add_executable(
    main
    ${SOURCES}
    ${AMPL_LIBRARY}
    )

target_link_libraries(
    main
    ${AMPL_LIBRARY}
    ampl
    pthread
    m
    dl
    )

The conan install .. and the cmake .. commands work just fine. But the make returns this:

cc1plus: warning: ~/ampl/amplapi/lib/libampl.so: not a directory
In file included from ~/ampl/amplapi/include/ampl/amplexception.h:8,
                 from ~/ampl/amplapi/include/ampl/ep/errorinfo_ep.h:6,
                 from ~/ampl/amplapi/include/ampl/variant.h:7,
                 from ~/ampl/amplapi/include/ampl/ep/arg.h:4,
                 from ~/ampl/amplapi/include/ampl/dataframe.h:4,
                 from ~/ampl/amplapi/include/ampl/ampl.h:4,
                 from ~/ampl_test/src/main.cpp:3:
~/ampl/amplapi/include/ampl/format.h: In instantiation of ‘void fmt::internal::MemoryBuffer<T, SIZE, Allocator>::grow(std::size_t) [with T = wchar_t; long unsigned int SIZE = 500; Allocator = std::allocator<wchar_t>; std::size_t = long unsigned int]’:
~/ampl/amplapi/include/ampl/format.h:799:6:   required from here
~/ampl/amplapi/include/ampl/format.h:802:30: error: no matching function for call to ‘fmt::internal::MemoryBuffer<wchar_t, 500, std::allocator<wchar_t> >::allocate(std::size_t&, std::nullptr_t)’
  802 |   T *new_ptr = this->allocate(new_capacity, FMT_NULL);
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated due to -Wfatal-errors.
make[2]: *** [CMakeFiles/main.dir/build.make:76: CMakeFiles/main.dir/src/main.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/main.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

AnNd yes, the directory ~/ampl/amplapi/lib/libampl.so exists, although I do not know why CMake relutes in recognizing it.

I would like to know if anyone ever passed by such situation before.

Thanks and best regards.

2

Sorry, just found out that I hadn’t upgraded my AMPL to the most recent version. Now everything is fine.