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* [Bug c++/104461] New: cody requires -fmodule-mapper hostname to have an IPv6 address
@ 2022-02-09 12:22 aoliva at gcc dot gnu.org
2022-04-06 3:22 ` [Bug c++/104461] " xry111 at mengyan1223 dot wang
0 siblings, 1 reply; 2+ messages in thread
From: aoliva at gcc dot gnu.org @ 2022-02-09 12:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104461
Bug ID: 104461
Summary: cody requires -fmodule-mapper hostname to have an IPv6
address
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: aoliva at gcc dot gnu.org
CC: nathan at gcc dot gnu.org
Blocks: 103524
Target Milestone: ---
A host whose localhost maps to 127.0.0.1 but not ::1 fails bad-mapper-3.C
because we get an error about name resolution rather than connection. This
might be the reason for part of the errors in bug 99175.
That's because mapper-client.cc calls netclient.cc OpenInet6, that insists on
strict IPv6 addresses, rejecting even AI_V4MAPPED ones.
Any reason to not go AF_UNSPEC instead, and use getaddrinfo's port-to-sockaddr
conversion while at that?
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103524
[Bug 103524] [meta-bug] modules issue
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/104461] cody requires -fmodule-mapper hostname to have an IPv6 address
2022-02-09 12:22 [Bug c++/104461] New: cody requires -fmodule-mapper hostname to have an IPv6 address aoliva at gcc dot gnu.org
@ 2022-04-06 3:22 ` xry111 at mengyan1223 dot wang
0 siblings, 0 replies; 2+ messages in thread
From: xry111 at mengyan1223 dot wang @ 2022-04-06 3:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104461
Xi Ruoyao <xry111 at mengyan1223 dot wang> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jwakely.gcc at gmail dot com,
| |xry111 at mengyan1223 dot wang
--- Comment #1 from Xi Ruoyao <xry111 at mengyan1223 dot wang> ---
It's because the paper (https://wg21.link/p1184) explicitly says "an ipv6
domain socket & port", I think. It's not clear if AI_V4MAPPED addresses are
allowed.
The problem is there is no "elegent" way for a distro maintainer to ensure an
IPv6 address for localhost is available on Linux/GNU. If /etc/nsswitch.conf
contains
hosts: files dns
(this is the default of Glibc and used by many distros), and /etc/hosts
contains
127.0.0.1 localhost
::1 localhost
By default Glibc will ignore "::1" for localhost, unless "multi on" is
specified in /etc/host.conf. But Glibc doc explicitly says it may cause a
performance issue (see man host.conf). On systems using systemd, the distro
can specify nss_myhostname in /etc/nsswitch.conf, but it does not exist on
non-systemd distros.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-02-09 12:22 [Bug c++/104461] New: cody requires -fmodule-mapper hostname to have an IPv6 address aoliva at gcc dot gnu.org
2022-04-06 3:22 ` [Bug c++/104461] " xry111 at mengyan1223 dot wang
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