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Subject: [Bug libstdc++/104859] [11 Regression] libg++ fails during bootstrap
Date: Thu, 07 Apr 2022 19:36:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104859

--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Patrick Palka
<ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:c859c99a85b8743b2c1edc097c6f6406de337f45

commit r11-9798-gc859c99a85b8743b2c1edc097c6f6406de337f45
Author: Patrick Palka <ppalka@redhat.com>
Date:   Wed Mar 9 18:48:52 2022 -0500

    libstdc++: Avoid implicit narrowing from uint128_t [PR104859]

    We need to be explicit about narrowing conversions from uint128_t since,
    on targets that lack __int128, this type is defined as an integer-class
    type that is only _explicitly_ convertible to the builtin integer types.
    This issue was latent until r12-7563-ge32869a17b788b made the frontend
    correctly reject explicit conversion functions during (dependent)
    copy-initialization.

            PR libstdc++/104859

    libstdc++-v3/ChangeLog:

            * src/c++17/floating_to_chars.cc (__floating_to_chars_hex):
            Be explicit when narrowing the shifted effective_mantissa,
            since it may have an integer-class type.

    (cherry picked from commit 65857caee8ccfac5007a9fd0e5f18cce5e5fe934)=