Trying to create & use a conan package: lib dir not set - cmake

Question

I created a conan package for a 3rd party tool. I'm trying to test it, and it doesn't seem to add the lib dir so the linker can't find the package's lib. Not sure how to debug it.
Here's the conanfile.py for the package ("hjson"):
class HjsonConan(ConanFile):
name = "hjson"
version = "2.2"
url = "https://github.com/hjson/hjson-cpp"
license="MIT"
# Optional metadata
description = "hjson C++ json library"
# Binary configuration
settings = "os", "compiler", "build_type", "arch"
options = {"shared": [True, False], "fPIC": [True, False], "version": "ANY"}
default_options = {"shared": False, "fPIC": True, "version": "2.2"}
# Sources are located in the same place as this recipe, copy them to the recipe
exports_sources = ("hjson-src/*")
def source(self):
# unpacks into ./hjson-src
get(self,
f"https://github.com/hjson/hjson-cpp/archive/refs/tags/{self.options.version}.tar.gz",
destination='hjson-src',
strip_root=True)
def config_options(self):
if self.settings.os == "Windows":
del self.options.fPIC
def layout(self):
# Sets source=., build=build/Release, generators=build/generators
cmake_layout(self)
def generate(self):
tc = CMakeToolchain(self)
# Here is where to set CMake variables ("-DXYZ")
tc.variables["HJSON_ENABLE_INSTALL"] = 1
tc.generate()
def build(self):
cmake = CMake(self)
cmake.configure(build_script_folder='hjson-src')
cmake.build()
def package(self):
cmake = CMake(self)
cmake.install()
def package_info(self):
self.cpp_info.libs = ["hjson"]
# these are the defaults, here for clarity
self.cpp_info.includedirs = ["include"]
self.cpp_info.libdirs = ["lib"]
Running conan create . works; it populates a subdir of my ~/.conan with the lib and headers and other metadata.
So I try to use it, with this conanfile:
from conan import ConanFile
from conan.tools.cmake import CMake, cmake_layout
from conan.tools.build import cross_building
class HJsonTestConan(ConanFile):
settings = "os", "compiler", "build_type", "arch"
# VirtualBuildEnv and VirtualRunEnv can be avoided if "tools.env.virtualenv:auto_use" is defined
# (it will be defined in Conan 2.0)
generators = "CMakeDeps", "CMakeToolchain", "VirtualBuildEnv", "VirtualRunEnv"
apply_env = False
test_type = "explicit"
def requirements(self):
self.requires("hjson/2.2")
def build(self):
cmake = CMake(self)
cmake.configure()
cmake.build()
def layout(self):
cmake_layout(self)
def test(self):
if not cross_building(self):
cmd = os.path.join(self.cpp.build.bindirs[0], "example")
self.run(cmd, env="conanrun")
with this CMakeLists.txt:
cmake_minimum_required(VERSION 3.15)
project(PackageTest CXX)
find_package(hjson CONFIG REQUIRED)
add_executable(example src/example.cpp)
set_property(TARGET example PROPERTY CXX_STANDARD 20)
include_directories(${hjson_INCLUDE_DIRS})
link_directories(${hjson_LIB_DIRS})
target_link_libraries(example hjson)
but the link fails because it's not passing -L<conanpath> on the link line. Poking around, it looks like hjson_LIB_DIRS is not set in the generated build/generators/hjson-config.cmake:
set(hjson_VERSION_STRING "2.2")
set(hjson_INCLUDE_DIRS ${hjson_INCLUDE_DIRS_RELEASE} )
set(hjson_INCLUDE_DIR ${hjson_INCLUDE_DIRS_RELEASE} )
set(hjson_LIBRARIES ${hjson_LIBRARIES_RELEASE} )
set(hjson_DEFINITIONS ${hjson_DEFINITIONS_RELEASE} )
So where do I go to fix that? I did set the cpp_info.libdirs in the package, so not sure why it's not getting through to the generated config.
The created conan package looks like this, btw:
~/.conan/data/hjson/2.2/_/_/package/37c9d02f...91ef
├── conaninfo.txt
├── conanmanifest.txt
├── include
│ └── hjson
│ └── hjson.h
└── lib
├── hjson
│ ├── hjson-config-version.cmake
│ ├── hjson-config.cmake
│ ├── hjson-release.cmake
│ └── hjson.cmake
└── libhjson.a