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patches/glibc/2.9/170-2.10-dns-no-gethostbyname4.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun Jul 17 22:46:47 2011 +0200 (2011-07-17)
changeset 2892 aa934ec4b4ee
parent 1201 c9967a6e3b25
permissions -rw-r--r--
cc/gcc: add the backend/frontend infra for final gcc

Currently, we issue the bare-metal compiler from the pass_1 & pass_2
core compilers, because the final gcc breaks while doing so.

This implies we have to build some libces during the start_files step,
instead of the standard libc step. This is the case for newlib.

By adding a backend/frontend infra to the final gcc, we can abstract
what backend to call: the standard backend for non-bare-metal gcc,
and the core backend for bare-metal.

This patch is just an no-op, it just adds the final backend and
frontend without changing the way bare-metal is built, to come in a
subsequent patch.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr> 
     1 Original patch from: gentoo/src/patchsets/glibc/2.9/0080_all_glibc-2.10-dns-no-gethostbyname4.patch

     2 

     3 -= BEGIN original header =-

     4 http://sourceware.org/bugzilla/show_bug.cgi?id=7060

     5 http://bugs.gentoo.org/250468

     6 

     7 The gethostbyname4() lookup method is problematic since it fires out both

     8 the A and AAAA DNS queries in parallel and over the same socket. This

     9 should work in theory, but it turns out that many cheap DSL modems and

    10 similar devices have buggy DNS servers - if the AAAA query arrives too

    11 quickly after the A query, the server will generate only a single reply

    12 with the A query id but returning an error for the AAAA query; we get

    13 stuck waiting for the second reply.

    14 

    15 For gethostbyname4() users affected, disabling IPv6 in the system might

    16 work around the issue, unfortunately it only helps with applications

    17 using AI_ADDRCONFIG (e.g. Firefox); some (notably e.g. Pidgin) neglect

    18 to do that.

    19 

    20 Real fix should be using separate ports for the A and AAAA queries.

    21 

    22 -= END original header =-

    23 

    24 diff -durN glibc-2_9.orig/resolv/Versions glibc-2_9/resolv/Versions

    25 --- glibc-2_9.orig/resolv/Versions	2008-08-01 19:15:34.000000000 +0200

    26 +++ glibc-2_9/resolv/Versions	2009-02-02 22:00:46.000000000 +0100

    27 @@ -102,7 +102,7 @@

    28      _nss_dns_gethostbyname_r; _nss_dns_getnetbyaddr_r;

    29      _nss_dns_getnetbyname_r; _nss_dns_getcanonname_r;

    30      _nss_dns_gethostbyaddr2_r;

    31 -    _nss_dns_gethostbyname4_r;

    32 +#    _nss_dns_gethostbyname4_r;

    33    }

    34  }

    35
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