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From:	"Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Date:	Thu, 10 Dec 2020 21:56:27 +0300
Message-ID:	<CAA2C=vA0rCDsZk1ou75XcU9tGRO8c7JzJVU5xuG6Q5Q9GeFO5g@mail.gmail.com>
Subject:	Re: Difficulties compiling libc from repository using gcc 10.N.0
To:	djgpp AT delorie DOT com
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On 12/10/20, Eli Zaretskii (eliz AT gnu DOT org) [via djgpp AT delorie DOT com]
<djgpp AT delorie DOT com> wrote:
>> --- src/libc/ansi/stdlib/exit.c	2 May 2015 07:32:10 -0000	1.9
>> +++ src/libc/ansi/stdlib/exit.c	10 Dec 2020 17:39:43 -0000
>> @@ -15,7 +15,7 @@
>>
>>  struct __atexit *__atexit_ptr = 0;
>>
>> -void (*__stdio_cleanup_hook)(void);
>> +extern void (*__stdio_cleanup_hook)(void); /* stdio/stdiohk.c */
>
> This part I don't understand: are you saying that it is no longer the
> default that a function not explicitly declared 'static' has the
> external linkage?  Why do we need an explicit 'extern' qualifier?

If I understand your question correctly, the function pointer
__stdio_cleanup_hook is not static. It is defined both in stdlib/exit.c
and in stdio/stdiohk.c, hence the issues with -fno-common.

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