[question] `transitive_headers` not working as expected

I have the following situation:

• I have a library base that depends on a library audio which depends on the dr_wav library.
• The base library includes the audio.hpp from the audio library which again includes the dr_wav.h header.

So there is a transitive header dependency to dr_wav from base and also from the test_package of the audio library.

graph TD;
    base-->audio;
    audio-->dr_wav;
    test_package_audio[audio test_package]-->audio;
    base-. transitive_headers .->dr_wav;
    test_package_audio-. transitive_headers .->dr_wav;

This works and builds fine when defining the dr_wav requires in audio with the transitive_headers option: self.requires("drwav/0.13.7", transitive_headers=True)

But now I also have a test_package for base which depends transitively on the dr_wav.h header:

graph TD;
    base-->audio;
    audio-->dr_wav;
    test_package_base[base test_package]-->base;
    test_package_base-. transitive_headers .->audio;
    test_package_base-. transitive_headers .->dr_wav;

I enabled the transitive_headers option also for the audio library dependency in base: self.requires("audio/1.0.0", transitive_headers=True)
Now the base test_package can find the audio.hpp header file, but not the dr_wav.h. I also checked the CMakeDeps generated files in the test_package and the drwav-release-x86_64-data.cmake file does not include the header directory:

set(drwav_INCLUDE_DIRS_RELEASE )
set(drwav_RES_DIRS_RELEASE )
set(drwav_DEFINITIONS_RELEASE )
set(drwav_SHARED_LINK_FLAGS_RELEASE )
set(drwav_EXE_LINK_FLAGS_RELEASE )
set(drwav_OBJECTS_RELEASE )
set(drwav_COMPILE_DEFINITIONS_RELEASE )
set(drwav_COMPILE_OPTIONS_C_RELEASE )
set(drwav_COMPILE_OPTIONS_CXX_RELEASE )
set(drwav_LIB_DIRS_RELEASE "${drwav_PACKAGE_FOLDER_RELEASE}/lib")
set(drwav_BIN_DIRS_RELEASE )
set(drwav_LIBRARY_TYPE_RELEASE STATIC)
set(drwav_IS_HOST_WINDOWS_RELEASE 0)
set(drwav_LIBS_RELEASE dr_wav)
set(drwav_SYSTEM_LIBS_RELEASE )
set(drwav_FRAMEWORK_DIRS_RELEASE )
set(drwav_FRAMEWORKS_RELEASE )
set(drwav_BUILD_DIRS_RELEASE )
set(drwav_NO_SONAME_MODE_RELEASE FALSE)

Am I missing something or could this even be a bug? I would expect transitive headers to be transitive over more than one dependency.

• I’ve read the CONTRIBUTING guide.

EDIT:

Implementation of minimal example from above can be found here: https://github.com/Linux13524/conan-transitive-headers

[czoido]

Thanks for reporting @Linux13524, the fix: https://github.com/conan-io/conan/pull/12508 was merged and will be in next beta to be released soon.

[memsharded]

Thanks to you @Linux13524 ! Testing and giving feedback for the 2.0 is really appreciated!