[package] boost/[>=1.69]: shared build fails with MinGW (Windows)

[Chnossos]

Package and Environment Details

• Package Name/Version: boost (tested with 1.69 and higher)
• Operating System+version: Windows 10 (21H1)
• Compiler+version: MinGW 8.1.0 (provided by Qt) - GCC 8
• Conan version: conan 1.36.0
• Python version: Python 3.8

Conan profile

[settings]
os=Windows
os_build=Windows
arch=x86_64
arch_build=x86_64
compiler=gcc
compiler.version=8
compiler.libcxx=libstdc++11
compiler.threads=posix
compiler.exception=seh
build_type=Release
[options]
[build_requires]
[env]

Steps to reproduce

conanfile.txt

[requires]
boost/1.69.0

[options]
boost:shared=True
boost:without_atomic=True
boost:without_chrono=True
boost:without_container=True
boost:without_context=True
boost:without_contract=True
boost:without_coroutine=True
boost:without_date_time=True
boost:without_exception=True
boost:without_fiber=True
boost:without_filesystem=False
boost:without_graph=True
boost:without_graph_parallel=True
boost:without_iostreams=True
boost:without_locale=True
boost:without_log=True
boost:without_math=True
boost:without_mpi=True
boost:without_program_options=True
boost:without_python=True
boost:without_random=True
boost:without_regex=True
boost:without_serialization=True
boost:without_stacktrace=True
boost:without_system=False
boost:without_test=True
boost:without_thread=True
boost:without_timer=True
boost:without_type_erasure=True
boost:without_wave=True

Logs

boost/1.69.0: WARN: Boost component 'filesystem' is missing libraries. Try building boost with '-o boost:without_filesystem'. (Option is not guaranteed to exist)
boost/1.69.0: WARN: Boost component 'system' is missing libraries. Try building boost with '-o boost:without_system'. (Option is not guaranteed to exist)
ERROR: boost/1.69.0: Error in package_info() method, line 1492
        raise Conan Exception("These libraries were build, but were not used in any boost module: {}".format(non_used))
        ConanException: These libraries were built, but were not used in any boost module: {'boost_system.dll', 'boost_filesystem.dll'}

The thing is MinGW when building shared libs outputs two files: xxx.dll (placed in package/{id}/bin) and xxx.dll.a (placed in package/{id}/lib), then tools.collect_libs(self) reports what it finds in the lib folder (without lib prefix and .a suffix): {'boost_system.dll', 'boost_filesystem.dll'} instead of reporting {'boost_system', 'boost_filesystem'} and the packaging fails while everything was alright.

boost conanfile.py:

all_detected_libraries = set(tools.collect_libs(self))
# prints {'boost_system.dll', 'boost_filesystem.dll'} if shared=True
    ...
module_libraries = filter_transform_module_libraries(self._dependencies["libs"][module])
# prints {'boost_system', 'boost_filesystem'}
all_expected_libraries = all_expected_libraries.union(module_libraries)
if set(module_libraries).difference(all_detected_libraries): # here is the problem
    incomplete_components.append(module)

[madebr]

We can't use str.removesuffix as that required CPython 3.9.
Does replacing

all_detected_libraries = set(tools.collect_libs(self))

with

def clean_libname(lib):
    if lib.endswith(".dll"):
        return lib[:-4]
    return lib
all_detected_libraries = set(clean_libname(l) for l in tools.collect_libs(self))

fix your problem?

[Chnossos]

Yes it does. Used:

set(l[:-4] if l.endswith(".dll") else l for l in tools.collect_libs(self))

[madebr]

Great to hear this!
If you feel up to the task, please open a pr with the fix.