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	Thu, 10 Dec 2020 10:55:19 -0800 (PST)
Subject:	Re: Difficulties compiling libc from repository using gcc 10.N.0
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From:	"J.W. Jagersma (jwjagersma AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
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Date:	Thu, 10 Dec 2020 19:55:11 +0100
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On 2020-12-10 19:25, Eli Zaretskii (eliz AT gnu DOT org) [via djgpp AT delorie DOT com] wrote:
>> From: "Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
>> Date: Thu, 10 Dec 2020 20:44:01 +0300
>>
>> --- src/debug/fsdb/makefile	27 Sep 1998 17:04:26 -0000	1.3
>> +++ src/debug/fsdb/makefile	10 Dec 2020 17:39:43 -0000
>> @@ -12,6 +12,9 @@ EOBJS += unassmbl.o
>>  
>>  include $(TOP)/../makefile.inc
>>  
>> +#see screen.h as to why this is needed
>> +CFLAGS += -fcommon
>> +
> 
> This part looks OK.
> 
>> --- 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?
> 
> Thanks.

This only applies to global variables (and __stdio_cleanup_hook here is a
function *pointer*), functions themselves still have implicit external linkage.

I'm not a C language lawyer but this page suggests that it was always an error
to omit 'extern' on global variable declarations.  It just wasn't reported as
such, until now:

https://gcc.gnu.org/gcc-10/porting_to.html

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