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Subject: Re: Test build of gcc-6.0.1-20160415
To: djgpp-workers AT delorie DOT com
References: <5713789D DOT 8070708 AT iki DOT fi> <57152494 DOT 6040808 AT gmx DOT de>
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From: "Andris Pavenis (andris DOT pavenis AT iki DOT fi) [via djgpp-workers AT delorie DOT com]" <djgpp-workers AT delorie DOT com>
Message-ID: <57184BDE.5050901@iki.fi>
Date: Thu, 21 Apr 2016 06:41:18 +0300
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On 04/21/2016 01:15 AM, Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via djgpp-workers AT delorie DOT com] 
wrote:
> Am 18.04.2016 23:12, schrieb Andris Pavenis (andris DOT pavenis AT iki DOT fi) [via djgpp-workers AT delorie DOT com]:
>> On
>
> The patch below is a proposition how the -Werror=nonnull-compare issue could be
> handled.  The patch has intentionaly not been committed because there may be
> multiple ways to fix this issue.  I have intentionaly prefered the way using
> all the different -fno-builtin-* flags.  This way we see about what we are
> warned and what we are intentionaly ignoring.  I have no preferences and if
> someone else disigns a smarter or different fix, feel free to discard this
> approach.
>
>
> Regards,
> Juan M. Guerrero
>
>
>
> 2016-04-20  Juan Manuel Guerrero <juan DOT guerrero AT gmx DOT de>
>
>     * djgpp/src/makefile.cfg:  Fixing -Werror=nonnull-compare for gcc 6.0.1.
>
>
>
- I guess it would be better to avoid using -fno-builtin-* globally, but only where required

- there seems to be no need to protect for old GCC versions as documented behavior of gcc is to ignore
-fno-builtin-foobar when it does not have __builtin_foobar. Tried under Linux (both gcc-5.3 and 
3.4.6 provided with Fedora 23 behave this way).

- one could use simple -fno-builtin for small source files like strlen.c where there is actually 
one built involved (easier to maintain in future)

- DJGPP NULL dereferencing pointer do not cause crash in all environments. Workaround could be to 
manually crash program if such operation is tried like 'if (ptr==NULL) { abort(); }'  (or 
raise(SIGSEGV);)
This is however perhaps not time to change this behavior.

Andris