使用CMake创建iOS静态库时出错

Question

I'm trying to create a static library of the project json11 with CMake, to use in a iOS project.

I had created a sample project here: https://github.com/4brunu/json11CMakeiOS

When building the json11 target it work's fine, but the json11_test target return's the following error:

=== BUILD TARGET json11_test OF PROJECT example_all WITH CONFIGURATION Debug ===

Check dependencies
target specifies product type 'com.apple.product-type.tool', but there's no such product type for the 'iphoneos' platform

** BUILD FAILED **


The following build commands failed:
    Check dependencies
(1 failure)

The original json11 CMakeLists.txt is this:

cmake_minimum_required(VERSION 3.2)
project(json11 VERSION 1.0.0 LANGUAGES CXX)

enable_testing()

add_library(json11 json11.cpp)
target_include_directories(json11 PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
target_compile_options(json11
  PUBLIC -std=c++11
  PRIVATE -fno-rtti -fno-exceptions -Wall -Wextra -Werror)
configure_file("json11.pc.in" "json11.pc" @ONLY)

add_executable(json11_test test.cpp)
target_link_libraries(json11_test json11)

install(TARGETS json11 DESTINATION lib)
install(FILES "${CMAKE_CURRENT_SOURCE_DIR}/json11.hpp" DESTINATION include)
install(FILES "${CMAKE_BINARY_DIR}/json11.pc" DESTINATION lib/pkgconfig)

After some test's, I had modified the CMakeLists.txt and it works, but I'm trying to figure out what's wrong.

cmake_minimum_required(VERSION 3.2)
project(json11 VERSION 1.0.0 LANGUAGES CXX)

enable_testing()

add_library(json11 json11.cpp)
target_include_directories(json11 PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
target_compile_options(json11
  PUBLIC -std=c++11
  PRIVATE -fno-rtti -fno-exceptions -Wall -Wextra -Werror)
configure_file("json11.pc.in" "json11.pc" @ONLY)

# Commented this two lines
# add_executable(json11_test test.cpp)
# target_link_libraries(json11_test json11)

install(TARGETS json11 DESTINATION lib)
install(FILES "${CMAKE_CURRENT_SOURCE_DIR}/json11.hpp" DESTINATION include)
install(FILES "${CMAKE_BINARY_DIR}/json11.pc" DESTINATION lib/pkgconfig)

Not sure if the issue is in the CMake configuration 1 2 , the iOS toolchain , json11 CMake , or any other thing.

Thanks for the help.

EDIT

I have not found a solution but rather a work around, making the tests optional.

https://github.com/4brunu/json11CMakeiOS/commit/972f00b646057a513d14a90b874f9f398fcff873 https://github.com/dropbox/json11/pull/66

Answer 1

The problem is the test target that comes with the library. In C and C++ you usual have a dedicated command line executable that runs a test suite. On OSX there is target type for that called Command Line Tool . Xcode references target types with a reverse DNS identifier, in this case com.apple.product-type.tool . On iOS you do not have a target type for command line tools because, well, there is no public command line that you could run the executable from.

That being said, you have already found the solution yourself: deactivate the test target generation in CMake for that library if you want to build for iOS.