Re: [release] Boost 1.91.0 Beta 1 Release Candidate 1 is available

On Thu, Mar 5, 2026 at 8:41 PM Marshall Clow via Boost <
[email protected]> wrote:

> Available at: <https://archives.boost.io/beta/1.91.0.beta1/source/>
>
> The SHA256 checksums are as follows:
>
> b8e78a226d2c0bd6ad4346254988dc2af15c0ae569d974e4da09e7dd0f338980
> boost_1_91_0_b1_rc1.zip
> 866a39f4b6b1591c04bbb7d9c70ed241a794162512df0fa2ef79374b774354a3
> boost_1_91_0_b1_rc1.7z
> d1eb15102b3379bff874894dd0c39d25a85c9c41147a2dd25215602b911125db
> boost_1_91_0_b1_rc1.tar.bz2
> 1194fb011943b4425cc6e15f3ee7272ae9c8331938c7d1bac8767850463c2e84
> boost_1_91_0_b1_rc1.tar.gz
>
> As always, the release managers would appreciate it if you download the
> candidate of your choice and give building it a try. Please report both
> success and failure, and anything else that is noteworthy.
>
> -- The Release managers
>

Looks mostly good for windows/visual studio. This is the first build I've
done with Visual Studio 2026/msvc-14.5.

toolset     arch    compile Link    Execute
msvc-14.1   32      X       X       X
msvc-14.1   64      X       X       X
msvc-14.2   32      X       X       X
msvc-14.2   64      X       X       X
msvc-14.3   32      X       X       X
msvc-14.3   64      X       X       X
msvc-14.5   32      X       X       X
msvc-14.5   64      X       X       X

Compile means that the b2 command completed without errors
Link means that visual studio was able to link a sample executable to a
library (libboost_thread-vcXXX-mt[-gd]-1_XX.lib) generated
Execute means that the linked program executed without errors.


There was an odd error message during config on all compilers, I'm not sure
what the implications of this are, but no compile errors:

    - has fallocate            : no  (cached) [11]
    - exceptions               : yes (cached) [11]
    - sfinae_expr              : yes (cached) [11]
    - has <type_traits> sufficient for Boost.Scope : yes (cached) [11]
error: No best alternative for
/D:/RB/boost_1_91_0/libs/graph_parallel/build/boost_graph_parallel with
<abi>ms <address-model>32 <architecture>x86 <asynch-exceptions>off
<binary-format>pe <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>off <embed-manifest-via>linker
<embed-manifest>on <exception-handling>on <extern-c-nothrow>off
<inlining>full <known-warnings>hide <link>static <midl-robust>yes
<midl-stubless-proxy>yes <optimization>speed <os>NT <pch>on
<preserve-test-targets>on <profiling>off <python-debugging>off <python>3.14
<rtti>on <runtime-debugging>off <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>release
<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) [11]
    - zstd                     : no  (cached) [11]
    - cxx11_hdr_initializer_list : yes (cached) [11]

Full logs can be seen here:
https://gist.github.com/teeks99/d67510283ea90008f7dabeb0113a33a6

Tom
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