[bug] Cmake's find_package fails even with requirements set

[xahon]

Environment Details (include every applicable attribute)

• Operating System+version: Linux
• Compiler+version: clang 7.0.1
• Conan version: 1.31.0
• Python version: 3.7.4

Steps to reproduce (Include if Applicable)

I'm trying to create a package for a third-party library that uses PulseAudio as a dependency. I've added that dependency into def requirements(self) from bincrafters repo. It fails to configure cmake with that output

... a bunch of stuff above ... Package 'libpng', required by 'freetype2', not found -- Found Fontconfig: /usr/lib64/libfontconfig.so
CMake Error at proj/cmake/platform_linux.cmake:139 (find_package): By not providing "FindPulseAudio.cmake" in CMAKE_MODULE_PATH this project has asked CMake to find a package configuration file provided by "PulseAudio", but CMake did not find one.

Could not find a package configuration file provided by "PulseAudio" with any of the following names:

PulseAudioConfig.cmake
pulseaudio-config.cmake

Add the installation prefix of "PulseAudio" to CMAKE_PREFIX_PATH or set "PulseAudio_DIR" to a directory containing one of the above files. If "PulseAudio" provides a separate development package or SDK, be sure it has been installed. Call Stack (most recent call first): CMakeLists.txt:29 (include)

-- Configuring incomplete, errors occurred! See also "/home/user/conan/Cinder/0.9.5///build/0ee6551d361945debc13c78a4ba71d22a111c8b3/CMakeFiles/CMakeOutput.log". Cinder/0.9.5: Cinder/0.9.5: ERROR: Package '0ee6551d361945debc13c78a4ba71d22a111c8b3' build failed Cinder/0.9.5: WARN: Build folder /home/user/conan/Cinder/0.9.5///build/0ee6551d361945debc13c78a4ba71d22a111c8b3 ERROR: Cinder/0.9.5: Error in build() method, line 45 cmake = self._configure_cmake() while calling '_configure_cmake', line 33 cmake.configure() ConanException: Error 1 while executing cd '/home/user/conan/Cinder/0.9.5//_/build/0ee6551d361945debc13c78a4ba71d22a111c8b3' && cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE="Debug" -DCONAN_IN_LOCAL_CACHE="ON" -DCONAN_COMPILER="clang" -DCONAN_COMPILER_VERSION="7.0" -DCONAN_CXX_FLAGS="-m64" -DCONAN_SHARED_LINKER_FLAGS="-m64" -DCONAN_C_FLAGS="-m64" -DCONAN_LIBCXX="libstdc++11" -DBUILD_SHARED_LIBS="OFF" -DCMAKE_INSTALLPREFIX="/home/user/conan/Cinder/0.9.5//_/package/0ee6551d361945debc13c78a4ba71d22a111c8b3" -DCMAKE_INSTALL_BINDIR="bin" -DCMAKE_INSTALL_SBINDIR="bin" -DCMAKE_INSTALL_LIBEXECDIR="bin" -DCMAKE_INSTALL_LIBDIR="lib" -DCMAKE_INSTALL_INCLUDEDIR="include" -DCMAKE_INSTALL_OLDINCLUDEDIR="include" -DCMAKE_INSTALL_DATAROOTDIR="share" -DCONAN_CMAKE_POSITION_INDEPENDENT_CODE="ON" -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY="ON" -DCONANEXPORTED="1" -Wno-dev '/home/user/conan/Cinder/0.9.5//_/build/0ee6551d361945debc13c78a4ba71d22a111c8b3'

The recipe

from conans import ConanFile, CMake

class CinderConan(ConanFile):
    name = "Cinder"
    description = "Cinder is a community-developed, free and open source library for professional-quality creative coding in C++."
    topics = ["graphics", "3d", "2d", "image-processing"]
    url = "https://github.com/cinder/Cinder"
    homepage = "https://github.com/cinder/Cinder"
    license = "2-Clause BSD License"
    generators = "cmake"
    settings = "os", "arch", "compiler", "build_type"

    options = {
        "shared": [True, False],
        "fPIC": [True, False],
    }
    default_options = {
        "shared": False,
        "fPIC": True,
    }

    git_url = "file:///home/user/dev/m/cinder-conan/Source"
    source_folder = "_source"
    install_folder = "_source"

    def requirements(self):
        if self.settings.os == "Linux":
            self.requires("pulseaudio/13.0@bincrafters/stable")

    def _configure_cmake(self):
        _cmake = CMake(self)
        _cmake.configure()
        return _cmake

    def config_options(self):
        if self.settings.os == "Windows":
            self.options.fPIC = False

    def source(self):
        self.run("git clone --depth 1 %s %s" % (self.git_url, self.source_folder))
        self.run("cd %s" % self.source_folder)

    def build(self):
        cmake = self._configure_cmake()
        cmake.build()

    def package(self):
        cmake = self._configure_cmake()
        cmake.install()
        self.copy(pattern="COPYING", dst="licenses", src=self.source_folder)

[memsharded]

Hi @xahon

We would need to have a look at cinder CMakeLists.txt.

Using the cmake Conan generator won't automagically inject the dependency so find_package will find it. You have several alternatives:

• Modify your CMakeLists.txt to call include(..../conanbuildinfo.cmake) and use the CONAN_PKG::PulseAudio target instead of the find_package: https://docs.conan.io/en/latest/integrations/build_system/cmake/cmake_generator.html#targets-approach
• Use the cmake_find_package or cmake_find_package_multi generators. They will generate some .cmake scripts in your local folder, then add this path to CMAKE_MODULE_PATH and CMAKE_PREFIX_PATH so find_package() find and use these scripts.

You are also using and old recipe, not a modern one. The maintained ones are those in ConanCenter without user and channel: https://conan.io/center/pulseaudio (so use it with ``self.requires("pulseaudio/14.0")

[memsharded]

Closing as inactive and very outdated, using the legacy Conan 1.X integrations. Please check latest Conan 2.X integrations and file any new tickets if necessary, thanks for the feedback.