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Date: Thu, 26 May 2016 13:21:39 -0700
From: William Ahern <william@...handClement.com>
To: musl@...ts.openwall.com
Subject: Re: sockaddr_storage and GCC 6.1
I forgot to mention that I'm not subscribed to the list.
I was able to build GCC 6.1 last night, but on my OS X desktop. My Alpine
Linux development environment doesn't have the disk space. My test code
manually reproduced the structure definitions.
Both of the patches proposed appear to work, at least with strict aliasing
disabled. Attached is the source code I used to verify. Here's the output of
`make test`.
== ss-darwin-no-strict-aliasing ==
.ss_len: 0,1
.ss_family: 1,2
.__ss_pad1: 2,8
.__ss_align: 8,16
.__ss_pad2: 16,128
.sin_family: 1,2
.sin_port: 2,4
.sin_addr: 4,8
0x7f000001 (OKAY)
== ss-darwin-strict-aliasing ==
.ss_len: 0,1
.ss_family: 1,2
.__ss_pad1: 2,8
.__ss_align: 8,16
.__ss_pad2: 16,128
.sin_family: 1,2
.sin_port: 2,4
.sin_addr: 4,8
0x00000000 (FAIL)
== ss-musl0-no-strict-aliasing ==
.ss_family: 0,2
.__ss_align: 8,16
.__ss_padding: 16,128
.sin_family: 0,2
.sin_port: 2,4
.sin_addr: 4,8
0x00000000 (FAIL)
== ss-musl0-strict-aliasing ==
.ss_family: 0,2
.__ss_align: 8,16
.__ss_padding: 16,128
.sin_family: 0,2
.sin_port: 2,4
.sin_addr: 4,8
0x00000000 (FAIL)
== ss-musl1-no-strict-aliasing ==
.ss_family: 0,2
.__ss_family_pad: 2,8
.__ss_align: 8,16
.__ss_padding: 16,128
.sin_family: 0,2
.sin_port: 2,4
.sin_addr: 4,8
0x7f000001 (OKAY)
== ss-musl1-strict-aliasing ==
.ss_family: 0,2
.__ss_family_pad: 2,8
.__ss_align: 8,16
.__ss_padding: 16,128
.sin_family: 0,2
.sin_port: 2,4
.sin_addr: 4,8
0x00000000 (FAIL)
== ss-musl2-no-strict-aliasing ==
.ss_family: 0,2
.__ss_padding: 2,120
.__ss_align: 120,128
.sin_family: 0,2
.sin_port: 2,4
.sin_addr: 4,8
0x7f000001 (OKAY)
== ss-musl2-strict-aliasing ==
.ss_family: 0,2
.__ss_padding: 2,120
.__ss_align: 120,128
.sin_family: 0,2
.sin_port: 2,4
.sin_addr: 4,8
0x00000000 (FAIL)
View attachment "Makefile" of type "text/plain" (995 bytes)
View attachment "ss.c" of type "text/plain" (3377 bytes)
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