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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>
	<57154DC1 DOT 2080907 AT iki DOT fi> <5717FF70 DOT 3020801 AT gmx DOT de> <57184BDE DOT 5050901 AT iki DOT fi>
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:	<571D0950.50907@iki.fi>
Date:	Sun, 24 Apr 2016 20:58:40 +0300
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On 04/21/2016 06:41 AM, Andris Pavenis (andris DOT pavenis AT iki DOT fi) [via djgpp-workers AT delorie DOT com] wrote:
> 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

Tried variant with --fno-builtin-*
- gcc-6.0.1-20160415 (cross-compiling from Linux)
- gcc-3.4.6 (in WIndows 10 Home 32 bit VM under Linux)

No additional problems detected (except that gcc-l.opt, gcc.opt and gcc.opt were included in DJGPP 
source archive and as result gcc-3.4.6 complained about use of -iquote. Fixed that in trunk.

Andris

Index: src/libc/ansi/string/makefile
===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/ansi/string/makefile,v
retrieving revision 1.1
diff -p -r1.1 makefile
*** src/libc/ansi/string/makefile    16 Jun 1995 08:03:22 -0000 1.1
--- src/libc/ansi/string/makefile    24 Apr 2016 16:45:00 -0000
*************** SRC += syserr2.c
*** 28,30 ****
--- 28,32 ----
   SRC += syserr3.c

   include $(TOP)/../makefile.inc
+
+ strlen.o: EXTRA_CFLAGS += -fno-builtin-strlen
Index: src/libc/c99/math/makefile
===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/c99/math/makefile,v
retrieving revision 1.7
diff -p -r1.7 makefile
*** src/libc/c99/math/makefile    20 Oct 2013 13:57:11 -0000    1.7
--- src/libc/c99/math/makefile    24 Apr 2016 16:45:00 -0000
*************** fp-asm.h: fp-asm.sed $(TOP)/../../includ
*** 36,38 ****
--- 36,42 ----

   clean::
       $(MISC) rm fp-asm.h
+
+ nan.o: EXTRA_CFLAGS += -fno-builtin-nan
+ nanf.o: EXTRA_CFLAGS += -fno-builtin-nanf
+ nanl.o: EXTRA_CFLAGS += -fno-builtin-nanl
Index: src/libc/compat/string/makefile
===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/compat/string/makefile,v
retrieving revision 1.7
diff -p -r1.7 makefile
*** src/libc/compat/string/makefile    19 Jan 2003 13:03:56 -0000 1.7
--- src/libc/compat/string/makefile    24 Apr 2016 16:45:00 -0000
*************** SRC += strsep.c
*** 22,24 ****
--- 22,28 ----
   SRC += strupr.c

   include $(TOP)/../makefile.inc
+
+ stpcpy.o:    EXTRA_CFLAGS += -fno-builtin-stpcpy
+ stpncpy.o:    EXTRA_CFLAGS += -fno-builtin-stpncpy
+ strdup.o:    EXTRA_CFLAGS += -fno-builtin-strdup
Index: src/libc/posix/string/makefile
===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/posix/string/makefile,v
retrieving revision 1.3
diff -p -r1.3 makefile
*** src/libc/posix/string/makefile    14 Nov 2013 20:00:17 -0000 1.3
--- src/libc/posix/string/makefile    24 Apr 2016 16:45:00 -0000
*************** SRC += strndup.c
*** 8,10 ****
--- 8,13 ----
   SRC += strnlen.c

   include $(TOP)/../makefile.inc
+
+ strndup.o:    EXTRA_CFLAGS += -fno-builtin-strndup
+

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