Re: ABI ms config

I've pushed some commits (boost.contex) to branch develop.
Unfortunately I've no access to  Windows systems.

Oliver

19.08.2026 03:11:36 Tom Kent via Boost <[email protected]>:

> (Switching subject, was  Re: [release] Boost 1.92 RC1 available)
> 
> On Mon, Aug 10, 2026 at 7:36 PM Andrey Semashev via Boost <
> [email protected]> wrote:
> 
>> On 11 Aug 2026 00:58, Tom Kent via Boost wrote:
>>> Any ideas where that could be coming from? I'm pretty sure I don't set
>> that
>>> manually.
>> 
>> 
>> https://github.com/boostorg/context/blob/cc1b9e02cd530d6607becc984e1e5bfa4f7b3600/boost-context-features.jam#L54-L97
>> 
>> sysv is set by default. The default_abi rule is used by Boost.Context
>> project in private requirements, i.e. it applies only to Boost.Context.
>> If I'm not mistaken, for everyone else the sysv default remains in
>> effect unless abi is specified on the command line.
>> 
>> I think, the feature should be made optional with no default.
>> Boost.Context can continue to use the default_abi rule to deduce it from
>> the target platform, for everyone else it should not be set.
>> 
>>> On Sat, Aug 8, 2026 at 12:15 AM <[email protected]> wrote:
>>> 
>>>> for Windows '<abi>sysv' is wrong - I believe it should be '<abi>ms'
>>>> 
>>>> 08.08.2026 04:16:00 Tom Kent via Boost <[email protected]>:
>>>> 
>>>>> Still seeing the same config issue I reported for the beta RC:
>>>>> 
>>>>>     - long double support      : yes (cached) [2]
>>>>>     - std_wstreambuf           : yes (cached) [2]
>>>>> error: No best alternative for
>>>>> /D:/RB/boost_1_92_0/libs/graph_parallel/build/boost_graph_parallel with
>>>>> <abi>sysv <address-model>32 <architecture>x86 <asynch-exceptions>off
>>>>> <binary-format>elf <boost.beast.allow-deprecated>on
>>>>> <boost.beast.separate-compilation>on
>>>> <boost.cobalt.executor>any_io_executor
>>>>> <boost.cobalt.pmr>std <context-impl>fcontext <coverage>off
>>>>> <debug-store>object <debug-symbols>on <embed-manifest-via>linker
>>>>> <embed-manifest>on <exception-handling>on <extern-c-nothrow>off
>>>>> <inlining>off <known-warnings>hide <link>shared <midl-robust>yes
>>>>> <midl-stubless-proxy>yes <optimization>off <os>NT <pch>on
>>>>> <preserve-test-targets>on <profiling>off <python-debugging>off
>>>> <python>3.14
>>>>> <rtti>on <runtime-debugging>on <runtime-link>shared <stdlib>native
>>>>> <strip>off <target-os>windows <testing.execute>on <threadapi>win32
>>>>> <threading>multi <toolset-msvc:version>14.1 <toolset>msvc
>> <variant>debug
>>>>> <vectorize>off <visibility>hidden <warnings-as-errors>off <warnings>on
>>>>> <windows-api>desktop <x-deduced-platform>x86_32
>>>>>     matched: (empty)
>>>>>     matched: (empty)
>>>>>     - lzma                     : no  (cached) [2]
>>>>>     - zstd                     : no  (cached) [2]
>>>>> 
>> 
> 
> I've updated my command to include abi=ms but it is still complaining about
> a similar error:
> 
> b2 -j%NUMBER_OF_PROCESSORS% --without-mpi --build-dir=D:\RB/bin.v2
> --stage-libdir=lib32-msvc-14.1 --build-type=complete toolset=msvc-14.1
> address-model=32 architecture=x86 abi=ms stage
> Performing configuration checks
> 
>     - default address-model    : 64-bit (cached) [1]
>     - default architecture     : x86 (cached) [1]
> <snip>
>     - long double support      : yes (cached) [2]
>     - std_wstreambuf           : yes (cached) [2]
> error: No best alternative for
> /D:/RB/boost_1_93_0/libs/graph_parallel/build/boost_graph_parallel with
> <abi>ms <address-model>32 <architecture>x86 <asynch-exceptions>off
> <binary-format>elf <boost.beast.allow-deprecated>on
> <boost.beast.separate-compilation>on <boost.cobalt.executor>any_io_executor
> <boost.cobalt.pmr>std <context-impl>fcontext <coverage>off
> <debug-store>object <debug-symbols>on <embed-manifest-via>linker
> <embed-manifest>on <exception-handling>on <extern-c-nothrow>off
> <inlining>off <known-warnings>hide <link>shared <midl-robust>yes
> <midl-stubless-proxy>yes <optimization>off <os>NT <pch>on
> <preserve-test-targets>on <profiling>off <python-debugging>off <python>3.14
> <rtti>on <runtime-debugging>on <runtime-link>shared <stdlib>native
> <strip>off <target-os>windows <testing.execute>on <threadapi>win32
> <threading>multi <toolset-msvc:version>14.1 <toolset>msvc <variant>debug
> <vectorize>off <visibility>hidden <warnings-as-errors>off <warnings>on
> <windows-api>desktop <x-deduced-platform>x86_32
>     matched: (empty)
>     matched: (empty)
>     - lzma                     : no  (cached) [2]
>     - zstd                     : no  (cached) [2]
> 
> 
> Tom
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