Building boost with C++20 fails for gcc < 11 and clang < 14 because these don't support necessary features to build cobalt about conan-center-index HOT 8 CLOSED

$ conan install --requires boost/1.85.0 -s:h compiler.cppstd=20 --build=missing

======== Input profiles ========
Profile host:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.cppstd=20
compiler.libcxx=libstdc++11
compiler.version=8
os=Linux
[conf]
tools.build:compiler_executables={'c': '/usr/bin/gcc-8', 'cpp': '/usr/bin/g++-8'}
tools.system.package_manager:mode=install
tools.system.package_manager:sudo=True
tools.system.package_manager:tool=apt-get

Profile build:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.cppstd=20
compiler.libcxx=libstdc++11
compiler.version=8
os=Linux
[conf]
tools.build:compiler_executables={'c': '/usr/bin/gcc-8', 'cpp': '/usr/bin/g++-8'}
tools.system.package_manager:mode=install
tools.system.package_manager:sudo=True
tools.system.package_manager:tool=apt-get


======== Computing dependency graph ========
Graph root
    cli
Requirements
    boost/1.85.0#db9b7d91e0ad8ba0b5878eb24601edb7 - Cache
    bzip2/1.0.8#457c272f7da34cb9c67456dd217d36c4 - Cache
    libbacktrace/cci.20210118#ec1aa63bbc10145c6a299e68e711670c - Cache
    zlib/1.3.1#f52e03ae3d251dec704634230cd806a2 - Cache
Build requirements
    b2/4.10.1#a41eecb267963ddf518e3c177eae60e1 - Cache
Resolved version ranges
    zlib/[>=1.2.11 <2]: zlib/1.3.1

======== Computing necessary packages ========
boost/1.85.0: Checking 1 compatible configurations
boost/1.85.0: Compatible configurations not found in cache, checking servers
boost/1.85.0: 'cc9834956bfddf1e91a567af336872c31c2fa7be': compiler.cppstd=gnu20
Requirements
    boost/1.85.0#db9b7d91e0ad8ba0b5878eb24601edb7:513d61f177aea392acfcc93948c5fb179f67cc46 - Build
    bzip2/1.0.8#457c272f7da34cb9c67456dd217d36c4:75807e7575ecc0f6141344f7c4f5e86106b92ec2#e7bb1e1a36f70eb86ffd41962a2a1150 - Cache
    libbacktrace/cci.20210118#ec1aa63bbc10145c6a299e68e711670c:897e6fde718e72637d92b0b8ed929893a1976238#4c0f438ea996f61be0f064f6dfe9e58f - Cache
    zlib/1.3.1#f52e03ae3d251dec704634230cd806a2:897e6fde718e72637d92b0b8ed929893a1976238#69c09a3755a75a9d4e6823a96f3c2758 - Cache
Build requirements
    b2/4.10.1#a41eecb267963ddf518e3c177eae60e1:63fead0844576fc02943e16909f08fcdddd6f44b#a31a98f757dcf4d3f03ed629ccde26b7 - Download (conan-center-index-mirror)

======== Installing packages ========

-------- Downloading 1 package --------
b2/4.10.1: Retrieving package 63fead0844576fc02943e16909f08fcdddd6f44b from remote 'conan-center-index-mirror'
b2/4.10.1: Package installed 63fead0844576fc02943e16909f08fcdddd6f44b
b2/4.10.1: Downloaded package revision a31a98f757dcf4d3f03ed629ccde26b7
bzip2/1.0.8: Already installed! (2 of 5)
libbacktrace/cci.20210118: Already installed! (3 of 5)
zlib/1.3.1: Already installed! (4 of 5)
boost/1.85.0: Sources downloaded from 'conan-center-index-mirror'
boost/1.85.0: Calling source() in /home/user/.conan2/p/boostd5b7f929ac10e/s/src
boost/1.85.0: Downloading 124.0MB 7009fe1faa1697476bdc7027703a2badb84e849b7b0baad5086b087b971f8617
boost/1.85.0: Downloaded 72.0MB 58% 7009fe1faa1697476bdc7027703a2badb84e849b7b0baad5086b087b971f8617
boost/1.85.0: Sources for ['https://boostorg.jfrog.io/artifactory/main/release/1.85.0/source/boost_1_85_0.tar.bz2', 'https://sourceforge.net/projects/boost/files/boost/1.85.0/boost_1_85_0.tar.bz2'] found in remote backup https://artifactory.example.com/artifactory/generic-conan-center-backup-sources/
boost/1.85.0: Apply patch (conan): Optional flag to specify iconv from either libc of libiconv

-------- Installing package boost/1.85.0 (5 of 5) --------
boost/1.85.0: Building from source
boost/1.85.0: Package boost/1.85.0:513d61f177aea392acfcc93948c5fb179f67cc46
boost/1.85.0: Building your package in /home/user/.conan2/p/b/boost8af09f9c6fc7c/b
boost/1.85.0: Calling generate()
boost/1.85.0: Generators folder: /home/user/.conan2/p/b/boost8af09f9c6fc7c/b/build-release/conan
boost/1.85.0: Generating aggregated env files
boost/1.85.0: Generated aggregated env files: ['conanbuild.sh', 'conanrun.sh']
boost/1.85.0: Calling build()
boost/1.85.0: WARN: replace_in_file didn't find pattern '/* thread_local */' in '/home/user/.conan2/p/boostd5b7f929ac10e/s/src/boost/stacktrace/detail/libbacktrace_impls.hpp' file.
boost/1.85.0: WARN: replace_in_file didn't find pattern '/* static __thread */' in '/home/user/.conan2/p/boostd5b7f929ac10e/s/src/boost/stacktrace/detail/libbacktrace_impls.hpp' file.
boost/1.85.0: WARN: replace_in_file didn't find pattern 'local generic-os = [ set.difference $(all-os) : aix darwin vxworks solaris osf hpux ] ;' in '/home/user/.conan2/p/boostd5b7f929ac10e/s/src/tools/build/src/tools/gcc.jam' file.
boost/1.85.0: WARN: replace_in_file didn't find pattern 'local no-threading = android beos haiku sgi darwin vxworks ;' in '/home/user/.conan2/p/boostd5b7f929ac10e/s/src/tools/build/src/tools/gcc.jam' file.
boost/1.85.0: WARN: Patching user-config.jam
boost/1.85.0: WARN:
using zlib : 1.3.1 : <include>"/home/user/.conan2/p/zlibc65a5e419880a/p/include" <search>"/home/user/.conan2/p/zlibc65a5e419880a/p/lib" <name>z ;
using bzip2 : 1.0.8 : <include>"/home/user/.conan2/p/bzip260e7f6f9e08c1/p/include" <search>"/home/user/.conan2/p/bzip260e7f6f9e08c1/p/lib" <name>bz2 ;
using "gcc" :  :  "/usr/bin/g++-8" :
<compileflags>"-I/home/user/.conan2/p/libba2814d8dc90710/p/include" <linkflags>"-L/home/user/.conan2/p/libba2814d8dc90710/p/lib"  ;
boost/1.85.0: WARN: b2 -q numa=on target-os=linux architecture=x86 address-model=64 binary-format=elf abi=sysv --layout=system --user-config=/home/user/.conan2/p/boostd5b7f929ac10e/s/src/tools/build/user-config.jam -sNO_ZLIB=0 -sNO_BZIP2=0 -sNO_LZMA=1 -sNO_ZSTD=1 boost.locale.icu=off --disable-icu boost.locale.iconv=on boost.locale.iconv.lib=libc threading=multi visibility=hidden link=static variant=release --with-atomic --with-charconv --with-chrono --with-cobalt --with-container --with-context --with-contract --with-coroutine --with-date_time --with-exception --with-fiber --with-filesystem --with-graph --with-iostreams --with-json --with-locale --with-log --with-math --with-nowide --with-program_options --with-random --with-regex --with-serialization --with-stacktrace --with-system --with-test --with-thread --with-timer --with-type_erasure --with-url --with-wave toolset=gcc cxxstd=2a define=_GLIBCXX_USE_CXX11_ABI=1 pch=on -sLIBBACKTRACE_PATH=/home/user/.conan2/p/libba2814d8dc90710/p linkflags="" cxxflags="-fPIC -DBOOST_STACKTRACE_ADDR2LINE_LOCATION=/usr/bin/addr2line" install --prefix=/home/user/.conan2/p/b/boost8af09f9c6fc7c/p -j8 --abbreviate-paths -d0 --debug-configuration --build-dir="/home/user/.conan2/p/b/boost8af09f9c6fc7c/b/build-release"
boost/1.85.0: RUN: b2 -q numa=on target-os=linux architecture=x86 address-model=64 binary-format=elf abi=sysv --layout=system --user-config=/home/user/.conan2/p/boostd5b7f929ac10e/s/src/tools/build/user-config.jam -sNO_ZLIB=0 -sNO_BZIP2=0 -sNO_LZMA=1 -sNO_ZSTD=1 boost.locale.icu=off --disable-icu boost.locale.iconv=on boost.locale.iconv.lib=libc threading=multi visibility=hidden link=static variant=release --with-atomic --with-charconv --with-chrono --with-cobalt --with-container --with-context --with-contract --with-coroutine --with-date_time --with-exception --with-fiber --with-filesystem --with-graph --with-iostreams --with-json --with-locale --with-log --with-math --with-nowide --with-program_options --with-random --with-regex --with-serialization --with-stacktrace --with-system --with-test --with-thread --with-timer --with-type_erasure --with-url --with-wave toolset=gcc cxxstd=2a define=_GLIBCXX_USE_CXX11_ABI=1 pch=on -sLIBBACKTRACE_PATH=/home/user/.conan2/p/libba2814d8dc90710/p linkflags="" cxxflags="-fPIC -DBOOST_STACKTRACE_ADDR2LINE_LOCATION=/usr/bin/addr2line" install --prefix=/home/user/.conan2/p/b/boost8af09f9c6fc7c/p -j8 --abbreviate-paths -d0 --debug-configuration --build-dir="/home/user/.conan2/p/b/boost8af09f9c6fc7c/b/build-release"
notice: found boost-build.jam at /home/user/.conan2/p/boostd5b7f929ac10e/s/src/boost-build.jam
notice: loading B2 from /home/user/.conan2/p/b2b05c07523db95/p/bin/.b2/kernel/bootstrap.jam
notice: Searching '/etc' '/home/user' '/home/user/.conan2/p/b2b05c07523db95/p/bin/.b2/kernel' '/home/user/.conan2/p/b2b05c07523db95/p/bin/.b2/util' '/home/user/.conan2/p/b2b05c07523db95/p/bin/.b2/build' '/home/user/.conan2/p/b2b05c07523db95/p/bin/.b2/tools' '/home/user/.conan2/p/b2b05c07523db95/p/bin/.b2/contrib' '/home/user/.conan2/p/b2b05c07523db95/p/bin/.b2/.' for site-config configuration file 'site-config.jam'.
notice: Configuration file 'site-config.jam' not found in '/etc' '/home/user' '/home/user/.conan2/p/b2b05c07523db95/p/bin/.b2/kernel' '/home/user/.conan2/p/b2b05c07523db95/p/bin/.b2/util' '/home/user/.conan2/p/b2b05c07523db95/p/bin/.b2/build' '/home/user/.conan2/p/b2b05c07523db95/p/bin/.b2/tools' '/home/user/.conan2/p/b2b05c07523db95/p/bin/.b2/contrib' '/home/user/.conan2/p/b2b05c07523db95/p/bin/.b2/.'.
notice: Loading explicitly specified user configuration file:
    /home/user/.conan2/p/boostd5b7f929ac10e/s/src/tools/build/user-config.jam
notice: Searching '/home/user/.conan2/p/boostd5b7f929ac10e/s/src/tools/build' for user-config configuration file 'user-config.jam'.
notice: Loading user-config configuration file 'user-config.jam' from '/home/user/.conan2/p/boostd5b7f929ac10e/s/src/tools/build'.
notice: [zlib] Using pre-installed library
notice: [zlib] Condition
notice: [bzip2] Using pre-installed library
notice: [bzip2] Condition
notice: will use '/usr/bin/g++-8' for gcc, condition <toolset>gcc-8
notice: using gcc libraries :: <toolset>gcc-8 :: /usr/bin /usr/lib /usr/lib32 /usr/lib64
notice: using gcc archiver :: <toolset>gcc-8 :: /usr/bin/ar
warning: toolset gcc initialization: can not find tool windres
warning: initialized from /home/user/.conan2/p/boostd5b7f929ac10e/s/src/tools/build/user-config.jam:5
notice: using rc compiler :: <toolset>gcc-8 :: /usr/bin/as
notice: [zlib] zlib is already configured
notice: [bzip2] bzip is already configured
notice: iostreams: not using lzma compression
notice: iostreams: not using zstd compression
notice: [python-cfg] Configuring python...
notice: [python-cfg] Checking interpreter command "python"...
notice: [python-cfg] running command 'python -c "from sys import *; print('version=%d.%d\nplatform=%s\nprefix=%s\nexec_prefix=%s\nexecutable=%s' % (version_info[0],version_info[1],platform,prefix,exec_prefix,executable))" 2>&1'
notice: [python-cfg] ...requested configuration matched!
notice: [python-cfg] Details of this Python configuration:
notice: [python-cfg]   interpreter command: "python"
notice: [python-cfg]   include path: "/home/user/.pyenv/versions/3.10.4/include/python3.10"
notice: [python-cfg]   library path: "/home/user/.pyenv/versions/3.10.4/lib/python3.10/config" "/home/user/.pyenv/versions/3.10.4/lib"
notice: [python-cfg] Checking for NumPy...
notice: [python-cfg] running command 'python -c "import sys; sys.stderr = sys.stdout; import numpy; print(numpy.get_include())"'
notice: [python-cfg] NumPy disabled. Reason:
notice: [python-cfg]   python -c "import sys; sys.stderr = sys.stdout; import numpy; print(numpy.get_include())" aborted with
notice: [python-cfg]   Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'numpy'
Performing configuration checks

    - default address-model    : 64-bit [1]
    - default architecture     : x86 [1]
    - compiler supports SSE2   : yes [2]
    - compiler supports SSE4.1 : yes [2]
    - cxx11_static_assert      : yes [2]
    - cxx11_variadic_templates : yes [2]
    - cxx11_decltype           : yes [2]
    - GCC libquadmath and __float128 support : no [2]
    - cxx11_hdr_ratio          : yes [2]
    - cxx11_template_aliases   : yes [2]
    - cxx11_char16_t           : yes [2]
    - cxx11_char32_t           : yes [2]
    - cxx20_hdr_concepts       : no [2]
    - cxx20_hdr_concepts       : no [3]
    - has std::atomic_ref      : no [2]
    - has statx                : no [2]
    - has statx syscall        : yes [2]
    - cxx11_rvalue_references  : yes [2]
    - cxx11_scoped_enums       : yes [2]
    - cxx11_noexcept           : yes [2]
    - cxx11_nullptr            : yes [2]
    - cxx11_defaulted_functions : yes [2]
    - cxx11_defaulted_moves    : yes [2]
    - cxx11_deleted_functions  : yes [2]
    - cxx11_function_template_default_args : yes [2]
    - cxx11_final              : yes [2]
    - cxx11_override           : yes [2]
    - has init_priority attribute : yes [2]
    - has stat::st_blksize     : yes [2]
    - has stat::st_mtim        : yes [2]
    - has stat::st_mtimensec   : no [2]
    - has stat::st_mtimespec   : no [2]
    - has stat::st_birthtim    : no [2]
    - has stat::st_birthtimensec : no [2]
    - has stat::st_birthtimespec : no [2]
    - has fdopendir(O_NOFOLLOW) : yes [2]
    - has dirent::d_type       : yes [2]
    - has POSIX *at APIs       : yes [2]
    - has fallocate            : yes [2]
    - cxx11_auto_declarations  : yes [2]
    - cxx11_constexpr          : yes [2]
    - cxx11_hdr_mutex          : yes [2]
    - cxx11_hdr_tuple          : yes [2]
    - cxx11_lambdas            : yes [2]
    - cxx11_thread_local       : yes [2]
    - has_icu builds           : no [2]
    - zlib                     : yes [4]
    - bzip2                    : yes [4]
    - cxx11_basic_alignas      : yes [2]
    - iconv (libc)             : yes [2]
    - cxx11_hdr_functional     : yes [2]
    - cxx11_hdr_type_traits    : yes [2]
    - cxx11_range_based_for    : yes [2]
    - cxx11_smart_ptr          : yes [2]
    - native atomic int32 supported : yes [2]
    - native syslog supported  : yes [2]
    - pthread supports robust mutexes : yes [2]
    - Boost.Regex is header-only : yes [2]
    - lockfree boost::atomic_flag : yes [2]
    - compiler supports SSSE3  : yes [2]
    - compiler supports AVX2   : yes [2]
    - gcc visibility           : yes [2]
    - sfinae_expr              : yes [2]
    - cxx11_unified_initialization_syntax : yes [2]
    - cxx11_hdr_initializer_list : yes [2]
    - cxx11_hdr_chrono         : yes [2]
    - cxx11_numeric_limits     : yes [2]
    - cxx11_hdr_array          : yes [2]
    - cxx11_hdr_atomic         : yes [2]
    - cxx11_allocator          : yes [2]
    - cxx11_explicit_conversion_operators : yes [2]
    - cxx14_decltype_auto      : yes [2]
    - cxx14_generic_lambdas    : yes [2]
    - cxx14_return_type_deduction : yes [2]
    - cxx14_variable_templates : yes [2]
    - long double support      : yes [2]
    - Has Large File Support   : yes [2]
    - Has attribute init_priority : yes [2]
    - std_wstreambuf builds    : yes [2]
    - std_wstreambuf           : yes [2]
    - libbacktrace builds      : yes [2]
    - addr2line builds         : yes [2]
    - WinDbg builds            : no [2]
    - cxx11_rvalue_references  : yes [3]
    - WinDbg builds            : no [3]
    - WinDbgCached builds      : no [2]
    - WinDbgCached builds      : no [3]
    - BOOST_COMP_GNUC >= 4.3.0 : yes [2]
    - cxx11_hdr_thread         : yes [2]
    - cxx11_hdr_regex          : yes [2]

[1] gcc-8
[2] gcc-8/rls/bst.l-lbc/bst.l-on/bst.l-off/cxstd-2a-iso/lnk-sttc/nm-on/pythn-3.10/thrd-mlt/vsblt-hdn
[3] gcc-8/rls/bst.l-lbc/bst.l-on/bst.l-off/bld-no/cxstd-2a-iso/lnk-sttc/nm-on/pythn-3.10/thrd-mlt/vsblt-hdn
[4] lnk-sttc

Component configuration:

    - atomic                   : building
    - charconv                 : building
    - chrono                   : building
    - cobalt                   : building
    - container                : building
    - context                  : building
    - contract                 : building
    - coroutine                : building
    - date_time                : building
    - exception                : building
    - fiber                    : building
    - filesystem               : building
    - graph                    : building
    - graph_parallel           : not building
    - headers                  : not building
    - iostreams                : building
    - json                     : building
    - locale                   : building
    - log                      : building
    - math                     : building
    - mpi                      : not building
    - nowide                   : building
    - program_options          : building
    - python                   : not building
    - random                   : building
    - regex                    : building
    - serialization            : building
    - stacktrace               : building
    - system                   : building
    - test                     : building
    - thread                   : building
    - timer                    : building
    - type_erasure             : building
    - url                      : building
    - wave                     : building


boost/1.85.0: Package '513d61f177aea392acfcc93948c5fb179f67cc46' built
boost/1.85.0: Build folder /home/user/.conan2/p/b/boost8af09f9c6fc7c/b/build-release
boost/1.85.0: Generating the package
boost/1.85.0: Packaging in folder /home/user/.conan2/p/b/boost8af09f9c6fc7c/p
boost/1.85.0: Calling package()
boost/1.85.0: package(): Packaged 15275 '.hpp' files
boost/1.85.0: package(): Packaged 149 '.h' files
boost/1.85.0: package(): Packaged 323 '.ipp' files
boost/1.85.0: package(): Packaged 2 '.inc' files: strict_cpp_re.inc, cpp_re.inc
boost/1.85.0: package(): Packaged 17 files
boost/1.85.0: package(): Packaged 44 '.a' files
boost/1.85.0: package(): Packaged 1 '.txt' file: LICENSE_1_0.txt
boost/1.85.0: Created package revision 32f210f0c0638e7857579f423b05a471
boost/1.85.0: Package '513d61f177aea392acfcc93948c5fb179f67cc46' created
boost/1.85.0: Full package reference: boost/1.85.0#db9b7d91e0ad8ba0b5878eb24601edb7:513d61f177aea392acfcc93948c5fb179f67cc46#32f210f0c0638e7857579f423b05a471
boost/1.85.0: Package folder /home/user/.conan2/p/b/boost8af09f9c6fc7c/p
boost/1.85.0: WARN: Boost component 'cobalt' is missing libraries. Try building boost with '-o boost:without_cobalt'. (Option is not guaranteed to exist)
ERROR: boost/1.85.0: Error in package_info() method, line 1936
        raise ConanException(f"These libraries were expected to be built, but were not built: {non_built}")
        ConanException: These libraries were expected to be built, but were not built: {'boost_cobalt'}