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Date: Sun, 20 Sep 2020 06:19:10 -0600
From: Ariadne Conill <ariadne@...eferenced.org>
To: musl@...ts.openwall.com, "Dmitry V. Levin" <ldv@...linux.org>,
Bruno Haible <bruno@...sp.org>
Cc: config-patches@....org
Subject: Re: Re: OS detection wrong on Alpine Linux 3.10
Hello,
On 2020-09-20 04:12, Dmitry V. Levin wrote:
> On Sat, Sep 19, 2020 at 03:30:54PM +0200, Bruno Haible wrote:
>> The value of $host_os, determined by the current config.guess, is:
>> - On Alpine Linux 3.9: linux-musl
>> - On Alpine Linux 3.10: linux-gnu
>> - On Alpine Linux 3.12: linux-musl
>>
>> The reason is that config.guess tests 'ldd --version'. However, in
>> Alpine Linux 3.10, /usr/bin/ldd has been replaced with a shell script
>> that does not understand the --version option:
>>
>> $ cat /usr/bin/ldd
>> #!/bin/sh
>> exec /lib/ld-musl-x86_64.so.1 --list -- "$@"
>> $ /usr/bin/ldd --version 2>&1
>> /lib/ld-musl-x86_64.so.1: cannot load --version: No such file or directory
>>
>> Find attached a proposed fix. More details in
>> <https://lists.gnu.org/archive/html/bug-gnulib/2020-09/msg00098.html>.
>>
>> Bruno
>
>> >From 6e8da56c68ad94175d67acfc6257e614fe74e01d Mon Sep 17 00:00:00 2001
>> From: Bruno Haible <bruno@...sp.org>
>> Date: Sat, 19 Sep 2020 15:24:59 +0200
>> Subject: [PATCH] * config.guess: Fix determination of musl libc on Alpine
>> Linux 3.10.
>>
>> ---
>> ChangeLog | 5 +++++
>> config.guess | 14 ++++++--------
>> 2 files changed, 11 insertions(+), 8 deletions(-)
>>
>> diff --git a/ChangeLog b/ChangeLog
>> index 4f106db..834f4e5 100644
>> --- a/ChangeLog
>> +++ b/ChangeLog
>> @@ -1,3 +1,8 @@
>> +2020-09-19 Bruno Haible <bruno@...sp.org>
>> +
>> + * config.guess: Don't use 'ldd --version' to determine the presence of
>> + musl libc, as this fails on Alpine Linux 3.10.
>> +
>> 2020-09-08 Elad Lahav <e2lahav@...il.com>
>> Ben Elliston <bje@....org>
>>
>> diff --git a/config.guess b/config.guess
>> index 9aff91c..8d70ec2 100755
>> --- a/config.guess
>> +++ b/config.guess
>> @@ -2,7 +2,7 @@
>> # Attempt to guess a canonical system name.
>> # Copyright 1992-2020 Free Software Foundation, Inc.
>>
>> -timestamp='2020-08-17'
>> +timestamp='2020-09-19'
>>
>> # This file is free software; you can redistribute it and/or modify it
>> # under the terms of the GNU General Public License as published by
>> @@ -150,17 +150,15 @@ Linux|GNU|GNU/*)
>> #elif defined(__dietlibc__)
>> LIBC=dietlibc
>> #else
>> + #include <stdarg.h>
>> + #ifdef __DEFINED_va_list
>> + LIBC=musl
>> + #else
>> LIBC=gnu
>> #endif
>> + #endif
>> EOF
>> eval "`$CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^LIBC' | sed 's, ,,g'`"
>> -
>> - # If ldd exists, use it to detect musl libc.
>> - if command -v ldd >/dev/null && \
>> - ldd --version 2>&1 | grep -q ^musl
>> - then
>> - LIBC=musl
>> - fi
>> ;;
>> esac
>>
>
> Is this __DEFINED_va_list macro the official way of detecting musl?
> It looks very fragile to me.
There is no official way of detecting musl.
Ariadne
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