Your message dated Thu, 16 Dec 2021 03:36:36 +0100
with message-id <b3494e06-5f7c-7959-e47f-f113c21fc...@debian.org>
and subject line fixed in 11.2.0-13
has caused the Debian Bug report #1000398,
regarding libstdc++-11-dev: Failed to compile with clang++ C++20 mode due to
chenges of std::valarray.
to be marked as done.
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--
1000398: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1000398
Debian Bug Tracking System
Contact ow...@bugs.debian.org with problems
--- Begin Message ---
Package: libstdc++-11-dev
Version: 11.2.0-12
Severity: important
Dear Maintainer,
When compiling any C++20 source code using std::valarray with clang++,
failed to compile with below message:
---
/usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/valarray:foo:var
error: exception specification in declaration does not match previous
declaration
---
Because /usr/include/c++/11/valarray includes
/usr/include/c++/11/bits/valarray_array.h .
These decl. begin(valarray<_Tp>& __va) variants,
but recent version (11.2.0-12) changes /usr/include/c++/11/valarray
from older version (11.2.0-10) decl. of begin().
These added [[__nodiscard__]] and noexcept to recent version.
These changes violates specificaton P0012R1 after C++17,
clang++ checks this correctly , but g++ (<= 11) not seems to check this.
See,
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0012r1.html
Best regards,
Ohta.
-- System Information:
Debian Release: bookworm/sid
APT prefers unstable-debug
APT policy: (500, 'unstable-debug'), (500, 'stable-security'), (500,
'unstable'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 5.15.0-1-amd64 (SMP w/12 CPU threads)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=ja_JP.UTF-8, LC_CTYPE=ja_JP.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages libstdc++-11-dev depends on:
ii gcc-11-base 11.2.0-12
ii libc6-dev 2.32-4
ii libgcc-11-dev 11.2.0-12
ii libstdc++6 11.2.0-12
libstdc++-11-dev recommends no packages.
Versions of packages libstdc++-11-dev suggests:
ii libstdc++-11-doc 11.2.0-12
-- no debconf information
--- End Message ---
--- Begin Message ---
Version: 11.2.0-13
Fixed.
--- End Message ---
