CMake not correctly finding the configuration package for 3.7.0

[jelizaga3-gatech]

• What is the issue you have?
  cmake find-package is not correctly finding the nlohmann_json package installed from vcpkg

• Please describe the steps to reproduce the issue. Can you provide a small but working code example?

1. Run vcpkg search nlohmann-json
   Response: vcpkg-2019.07>vcpkg search nlohmann-json

   nlohmann-json 3.7.0 JSON for Modern C++

1a. Install vcpkg. vcpkg.exe install nlohmann-json

2. vcpkg installs to vcpkg-2019.07\packages\nlohmann-json_x86-windows

3. Use find_package in CMakeLists.txt in project

    # CMakeLists.txt
   set(nlohmann_json_DIR ${PROJECT_SOURCE_DIR}/../vcpkg-2019.07/packages/nlohmann- 
   json_x86-windows/share/nlohmann_json)
   find_package(nlohmann_json 3.7.0 REQUIRED)
   

• What is the expected behavior?
  CMake finds package.

• And what is the actual behavior instead?

1> CMake Error at ${PROJECT_SOURCE_DIR}\CMakeLists.txt:17 (find_package):
1>   Could not find a configuration file for package "nlohmann_json" that is
1>   compatible with requested version "3.7.0".
1> 
1>   The following configuration files were considered but not accepted:
1> 
1>     ${PROJECT_SOURCE_DIR}/../vcpkg-2019.07/packages/nlohmann-json_x86-windows/share/nlohmann_json/nlohmann_jsonConfig.cmake, version: 3.7.0 (32bit)

• Which compiler and operating system are you using? Is it a supported compiler?
  Clang I think, on a Windows 10 machine x64
  C:/Program Files (x86)/Microsoft Visual Studio/2017/Professional/VC/Tools/MSVC/14.16.27023/bin/Hostx86/x64/cl.exe

• Did you use a released version of the library or the version from the develop branch?

Released version 3.7.0 - https://github.com/nlohmann/json/tree/v3.7.0

• If you experience a compilation error: can you compile and run the unit tests?
  No compilation steps were taken.

[jelizaga3-gatech]

It returns the same thing for this in CMake, as well

set(CMAKE_PREFIX_PATH "${PROJECT_SOURCE_DIR}/../vcpkg-2019.07/packages/nlohmann-json_x86-windows/share/nlohmann_json;${CMAKE_PREFIX_PATH}")

I set these paths because CMake tells me to.
nlohmann_json_DIR-NOTFOUND:

1>   By not providing "Findnlohmann_json.cmake" in CMAKE_MODULE_PATH this
1>   project has asked CMake to find a package configuration file provided by
1>   "nlohmann_json", but CMake did not find one.
1> 
1>   Could not find a package configuration file provided by "nlohmann_json"
1>   (requested version 3.7.0) with any of the following names:
1> 
1>     nlohmann_jsonConfig.cmake
1>     nlohmann_json-config.cmake
1> 
1>   Add the installation prefix of "nlohmann_json" to CMAKE_PREFIX_PATH or set
1>   "nlohmann_json_DIR" to a directory containing one of the above files.  If
1>   "nlohmann_json" provides a separate development package or SDK, be sure it
1>   has been installed.
1> 

[jelizaga3-gatech]

This is also included in my CMakeLists

cmake_minimum_required (VERSION 3.12) 

project(FMSAirSDK VERSION 0.1 LANGUAGES CXX)

set_property(GLOBAL PROPERTY CXX_STANDARD 17)

if(MSVC)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /std:c++17")
endif(MSVC)

[nlohmann]

This seems to be a vcpkg issue. Could you file your issue here: https://github.com/Microsoft/vcpkg/issues ?

[nlohmann]

Can this issue be closed?