How to find (configure) Qt for cmake project of iOS?

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I install Qt via online installer on my macOS (Qt for iOS and macOS). And qmake project works just fine, now I need compile with cmake Qt project:

cmake_minimum_required(VERSION 3.5)
project(demo LANGUAGES CXX)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Qt5 COMPONENTS Core Quick REQUIRED)

And I can not find Qt.

Direct build configuration:

cmake .. -GXcode -DQt5_DIR=/Users/user/Qt/5.14.1/clang_64/lib/cmake/Qt5
...
-- Configuring done
-- Generating done
-- Build files have been written to:

Cross-compiling for iOS:

cmake .. -GXcode -DCMAKE_SYSTEM_NAME=iOS -DQt5_DIR=/Users/user/Qt/5.14.1/ios/lib/cmake/Qt5
...
CMake Error at /Users/user/Qt/5.14.1/ios/lib/cmake/Qt5/Qt5Config.cmake:28 (find_package):
  Could not find a package configuration file provided by "Qt5Core" with any
  of the following names:

    Qt5CoreConfig.cmake
    qt5core-config.cmake

  Add the installation prefix of "Qt5Core" to CMAKE_PREFIX_PATH or set
  "Qt5Core_DIR" to a directory containing one of the above files.  If
  "Qt5Core" provides a separate development package or SDK, be sure it has
  been installed.

Obviously Qt5CoreConfig.cmake is just fine and it is in relatively the same place as for "direct" compilation, but for some reason cmake can not find it

$ find /Users/user/Qt/5.14.1/ios/lib/cmake/ -name Qt5CoreConfig.cmake
/Users/user/Qt/5.14.1/ios/lib/cmake//Qt5Core/Qt5CoreConfig.cmake

How can I fix this?

cmake macos qt c++ ios
1 Answers

When building for iOS CMAKE_SYSROOT is set to iPhoneOS.sdk path.

find_package:

The CMAKE_SYSROOT variable can also be used to specify exactly one directory to use as a prefix. Setting CMAKE_SYSROOT also has other effects. See the documentation for that variable for more.

These variables are especially useful when cross-compiling to point to the root directory of the target environment and CMake will search there too. By default at first the directories listed in CMAKE_FIND_ROOT_PATH are searched, then the CMAKE_SYSROOT directory is searched, and then the non-rooted directories will be searched.

So, adding the option -DCMAKE_FIND_ROOT_PATH=/Users/user/Qt/5.14.1/ios will help.

user_22671140
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