Re: [release] Boost 1.91 RC1 available

On Apr 16, 2026, at 7:27 AM, Marshall Clow <[email protected]> wrote:
> 
> The first release candidates for the 1.91.0 release are now available at:
> <https://archives.boost.io/release/1.91.0/source/>
> 
> The SHA256 checksums are as follows:
> 
> 9446c37fd86fecd95254ebe5d368a66ef9b09cec4592b2746979076657e24e65	boost_1_91_0_rc1.7z
> 5734305f40a76c30f951c9abd409a45a2a19fb546efe4162119250bbe4d3a463	boost_1_91_0_rc1.tar.gz
> 69c6f32fbda3c478fb310ec251e6699e5e584dbc71afb5425c2f6e98c9540a77	boost_1_91_0_rc1.zip
> de5e6b0e4913395c6bdfa90537febd9028ea4c0735d2cdb0cd9b45d5f51264f5	boost_1_91_0_rc1.tar.bz2
> 
> 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.

I have successfully built the boost libraries on an M4Pro Mac Mini with
Apple clang version 21.0.0 (clang-2100.0.123.102)

There are significantly more warnings than the previous release.
In particular, there are over 3000 warnings of the form:

./boost/proto/transform/detail/preprocessed/call.hpp:12:23: warning: declaration of a variadic function without a comma before '...' is deprecated [-Wdeprecated-missing-comma-variadic-parameter]
   12 |     struct call<Fun(A0...)> : transform<call<Fun(A0...)> >
      |                       ^
      |                       , 
./boost/proto/transform/detail/preprocessed/call.hpp:12:52: warning: declaration of a variadic function without a comma before '...' is deprecated [-Wdeprecated-missing-comma-variadic-parameter]
   12 |     struct call<Fun(A0...)> : transform<call<Fun(A0...)> >
      |                                                    ^
      |                                                    , 
./boost/proto/transform/detail/preprocessed/call.hpp:32:28: warning: declaration of a variadic function without a comma before '...' is deprecated [-Wdeprecated-missing-comma-variadic-parameter]
   32 |     struct call<Fun(A0 , A1...)> : transform<call<Fun(A0 , A1...)> >

(C++2c only)

— Marshall

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