Trouble configuring czmq, zmq, and sodium with CMake

[DavidM-Fox]

I'm having trouble configuring/building czmq with CMake. This is the current project structure with the three libraries' source under "extlibs":

root
  |--CMakeLists.txt
  |--src
  |--include
  |--extlibs
  |   |--CMakeLists.txt
  |   |--sodium
  |   |--zmq
  |   |--czmq

Since I am building the libzmq library, how can I structure my CMake so that czmq won't complain about libzmq.lib not being present at config time? I have tested building zmq with sodium with what I have and it works, just adding the additional build_libczmq() makes it fail. I have each library installing to "root/build/x64/extlibs/". I have tried a custom target dependency structure but am having no luck with getting czmq to be okay with not seeing the .lib at config time. What can I try to make this work? Thanks!

The root CMakeLists.txt:

cmake_minimum_required (VERSION 3.15)
set(project czmq_build_project)
set(project_root ${CMAKE_CURRENT_SOURCE_DIR})
set(extlibs ${project_root}/extlibs)
set(msbuild "C:/Program Files (x86)/Microsoft Visual Studio/2019/Enterprise/MSBuild/Current/Bin/MSBuild.exe")
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED on)
set(project_cfg Release)
project(${project} CXX)

# Add source
add_executable (${project} "src/main.cpp" "include/class.hpp")

# Directories to search for headers -----------
include_directories(${extlibs})
include_directories(${project_root}/include)

# Add 3rd Party Libraries
add_subdirectory(${extlibs})

And the "extlibs/CMakeLists.txt"

# ----------------------------------------------
#           Third Party Libraries
# Note: All libraries are being built under a
# static release config for x64 (at the moment)
# ----------------------------------------------
# czmq requires libzmq. Additionaly, libsodium is 
# used for the curve encryption library for libzmq. 
# Therefore, we build: libsodium->libzmq->czmq.
# ----------------------------------------------

include(ExternalProject)
set(lib_out "${CMAKE_BINARY_DIR}/extlibs")

add_custom_target(buildsodium ALL)

# Configure libsodium -------------------------
function(build_libsodium)
    set(sodium_root "${extlibs}/sodium")
    set(sodium_sln "${sodium_root}/builds/msvc/vs2019/libsodium.sln")
    set(sodium_bin "${sodium_root}/bin")
    set(sodium_lib "${sodium_root}/bin/x64/${project_cfg}/v142/static/libsodium.lib")
    set(sodium_out "${lib_out}/sodium/libsodium.lib")
    set(sodium_bldcmd ${msbuild} -m -t:Build -p:configuration=Static${project_cfg} -p:platform=x64 ${sodium_sln})
    ExternalProject_Add(libsodium
      SOURCE_DIR        "${sodium_root}"
      CONFIGURE_COMMAND ""
      BUILD_COMMAND     ${sodium_bldcmd}
      INSTALL_COMMAND ""
      ALWAYS TRUE
    )
    add_custom_command(TARGET libsodium POST_BUILD
        BYPRODUCTS ${sodium_out}
        COMMAND echo "Copying libsodium.lib to ${sodium_out}"
        COMMAND ${CMAKE_COMMAND} -E copy ${sodium_lib} ${sodium_out}
        COMMAND echo "Removing ${sodium_bin}"
        COMMAND ${CMAKE_COMMAND} -E remove_directory ${sodium_bin}
    )
    add_dependencies(buildsodium libsodium)
endfunction()

add_custom_target(buildzmq ALL)

# Configure libzmq ----------------------------
function(build_libzmq)
    set(ENABLE_CURVE OFF )
    set(WITH_LIBSODIUM_STATIC ON)
    set(ENABLE_CPACK OFF)
    set(BUILD_SHARED OFF)
    set(BUILD_STATIC ON)
    set(BUILD_TESTS OFF)
    set(CMAKE_INCLUDE_PATH ${extlibs}/sodium/src/libsodium/include)
    set(CMAKE_LIBRARY_PATH ${lib_out}/sodium)
    set(CMAKE_CXX_FLAGS_RELEASE "/MT /O2 /Ob2 /DNDEBUG")
    set(CMAKE_CXX_FLAGS_DEBUG "/MTd /Zi /Ob0 /Od /RTC1")
    set(CMAKE_INSTALL_PREFIX ${lib_out}/zmq)
    add_subdirectory(zmq)
    add_dependencies(buildzmq buildsodium)
endfunction()

add_custom_target(buildczmq ALL)

# Configure czmq ------------------------------
function(build_libczmq)
    set(ZeroMQ_DIR ${lib_out}/zmq/lib)
    set(CZMQ_BUILD_SHARED OFF)
    set(CZMQ_BUILD_STATIC ON)
    set(BUILD_TESTING OFF)
    set(CMAKE_PREFIX_PATH ${lib_out}/zmq)
    set(LIBZMQ_INCLUDE_DIRS ${extlibs}/zmq/include)
    set(LIBZMQ_LIBRARIES ${lib_out}/zmq/lib)
    set(CMAKE_CXX_FLAGS_RELEASE "-DZMQ_STATIC /MT /O2 /Ob2 /DNDEBUG")
    set(CMAKE_CXX_FLAGS_DEBUG "-DZMQ_STATIC /MTd /Zi /Ob0 /Od /RTC1")
    set(CMAKE_CONFIGURATION_TYPES "Debug;Release")
    set(CMAKE_INSTALL_PREFIX ${lib_out}/czmq)
    add_subdirectory(czmq)
    add_dependencies(buildczmq buildzmq)
endfunction()

build_libsodium()
build_libzmq()
build_libczmq()

CMake output:

 CMake generation started for configuration: 'x64'.
1> Working directory: ...<root>\build\x64
1> [CMake] -- Detected ZMQ Version - 4.3.4
1> [CMake] -- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE) 
1> [CMake] -- Not building draft classes and methods
1> [CMake] -- Using builtin sha1
1> [CMake] -- CURVE security is disabled
1> [CMake] -- Detected _WIN32_WINNT from CMAKE_SYSTEM_VERSION: 0x0A00
1> [CMake] -- Using polling method in I/O threads: epoll
1> [CMake] -- Including wepoll
1> [CMake] -- Using polling method in zmq_poll(er)_* API: poll
1> [CMake] -- Using 64 bytes alignment for lock-free data structures
1> [CMake] -- Using condition_variable_t implementation: stl11
1> [CMake] -- Checking whether noexcept is supported
1> [CMake] -- Could NOT find AsciiDoc (missing: ASCIIDOC_EXECUTABLE) 
1> [CMake] CMake Deprecation Warning at extlibs/zmq/tests/CMakeLists.txt:2 (cmake_minimum_required):
1> [CMake]   Compatibility with CMake < 2.8.12 will be removed from a future version of
1> [CMake]   CMake.
1> [CMake] 
1> [CMake]   Update the VERSION argument <min> value or use a ...<max> suffix to tell
1> [CMake]   CMake that the project does not need compatibility with older versions.
1> [CMake] 
1> [CMake] 
1> [CMake] CMake Warning (dev) at extlibs/zmq/tests/CMakeLists.txt:306 (message):
1> [CMake]   Test 'test_bind_stream_fuzzer' is not known to CTest.
1> [CMake] This warning is for project developers.  Use -Wno-dev to suppress it.
1> [CMake] 
1> [CMake] CMake Warning (dev) at extlibs/zmq/tests/CMakeLists.txt:306 (message):
1> [CMake]   Test 'test_bind_ws_fuzzer' is not known to CTest.
1> [CMake] This warning is for project developers.  Use -Wno-dev to suppress it.
1> [CMake] 
1> [CMake] CMake Warning (dev) at extlibs/zmq/tests/CMakeLists.txt:306 (message):
1> [CMake]   Test 'test_connect_stream_fuzzer' is not known to CTest.
1> [CMake] This warning is for project developers.  Use -Wno-dev to suppress it.
1> [CMake] 
1> [CMake] CMake Warning (dev) at extlibs/zmq/tests/CMakeLists.txt:306 (message):
1> [CMake]   Test 'test_connect_ws_fuzzer' is not known to CTest.
1> [CMake] This warning is for project developers.  Use -Wno-dev to suppress it.
1> [CMake] 
1> [CMake] CMake Warning (dev) at extlibs/zmq/tests/CMakeLists.txt:306 (message):
1> [CMake]   Test 'test_socket_options_fuzzer' is not known to CTest.
1> [CMake] This warning is for project developers.  Use -Wno-dev to suppress it.
1> [CMake] 
1> [CMake] CMake Deprecation Warning at extlibs/zmq/unittests/CMakeLists.txt:2 (cmake_minimum_required):
1> [CMake]   Compatibility with CMake < 2.8.12 will be removed from a future version of
1> [CMake]   CMake.
1> [CMake] 
1> [CMake]   Update the VERSION argument <min> value or use a ...<max> suffix to tell
1> [CMake]   CMake that the project does not need compatibility with older versions.
1> [CMake] 
1> [CMake] 
1> [CMake] CMake Warning (dev) at C:/Program Files (x86)/Microsoft Visual Studio/2019/Enterprise/Common7/IDE/CommonExtensions/Microsoft/CMake/CMake/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
1> [CMake]   The package name passed to `find_package_handle_standard_args` (LIBZMQ)
1> [CMake]   does not match the name of the calling package (libzmq).  This can lead to
1> [CMake]   problems in calling code that expects `find_package` result variables
1> [CMake]   (e.g., `_FOUND`) to follow a certain pattern.
1> [CMake] Call Stack (most recent call first):
1> [CMake]   extlibs/czmq/Findlibzmq.cmake:83 (find_package_handle_standard_args)
1> [CMake]   extlibs/czmq/CMakeLists.txt:133 (find_package)
1> [CMake] This warning is for project developers.  Use -Wno-dev to suppress it.
1> [CMake] -- Could NOT find LIBZMQ (missing: LIBZMQ_LIBRARIES) 
1> [CMake] CMake Error at extlibs/czmq/CMakeLists.txt:144 (message):
1> [CMake]   libzmq not found.
1> [CMake] 
1> [CMake] 
1> [CMake] -- Configuring incomplete, errors occurred!
1> [CMake] See also "<root>/build/x64/CMakeFiles/CMakeOutput.log".
1> [CMake] See also "<root>/build/x64/CMakeFiles/CMakeError.log".

[sphaero]

I've only skimmed your issue quickly but at least I'm using czmq as a subdirectory in cmake. See here: https://github.com/hku-ect/gazebosc/blob/16c19a26cb987a0a75808dd42b7f10f287a84664/CMakeLists.txt#L66

We should be able to this better so if I can help I will

[sphaero]

From what I recall this is mostly about using zeromq projects as subdirectories in cmake. I think the ingescape project is doing this succesfully: see: https://github.com/zeromq/ingescape/blob/feb016e9c797e1a5c7b978d14ed6fcd78e2372e2/CMakeLists.txt#L161

[stale[bot]]

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