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Date: Mon, 18 May 2015 19:12:26 +0300
Message-ID: <CAA2C=vDViDW_U2NmAYnO=HtTZ+=aw68pg0=MKc=bu-DaUQxB9g@mail.gmail.com>
Subject: Re: ANNOUNCE: DJGPP 2.05 beta 1
From: "Ozkan Sezer (sezeroz AT gmail DOT com)" <djgpp AT delorie DOT com>
To: djgpp AT delorie DOT com
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On 5/18/15, Andris Pavenis (andris DOT pavenis AT iki DOT fi) <djgpp AT delorie DOT com> wrote:
> On 05/18/2015 06:22 PM, Ozkan Sezer (sezeroz AT gmail DOT com) wrote:
>> On 5/18/15, Eli Zaretskii (eliz AT gnu DOT org) <djgpp AT delorie DOT com> wrote:
>>>> Date: Mon, 18 May 2015 16:06:19 +0300
>>>> From: "Ozkan Sezer (sezeroz AT gmail DOT com)" <djgpp AT delorie DOT com>
>>>>
>>>> The discussion is about we are pointing to gcc's headers directory
>>>> for allowed includes when building djgpp itself, whereas
>>>>
>>>> (i) we don't need that at all anymore (it was done only to work around
>>>> a gcc builtin problem and it got solved without needing this hack),
>>>>
>>>> (ii) we are building with -nostdinc which means we are self-
>>>> sufficient, and that hack is against this,
>>>>
>>>> (iii) since our DBL_MAX, etc are not compile time constants but
>>>> symbols,
>>>> and gcc ones are, the binary output of several djgpp functions such as
>>>> strtod, etc, are different with and without gcc-headers hack.
>>>>
>>>> Those are the reasons I am against allowing gcc's headers in djgpp
>>>> build.
>>> AFAIR, -nostdinc means without library headers, but it does not
>>> preclude the headers that are internal to the compiler.
>>>
>> See below,
>>
>>> IOW, I'm not sure I understand the problem you have with what we do.
>>> Can you elaborate?
>>>
>> I thought that I elaborated enough in the whole thread, but here goes.
>> Get the cvs, compile normally under src/.  Make a backup copy of
>> src/libc/ansi/stdlib/strtod.d and then do the following:
>>
>> Index: makefile.inc
>> ===================================================================
>> RCS file: /cvs/djgpp/djgpp/src/makefile.inc,v
>> retrieving revision 1.16
>> diff -u -r1.16 makefile.inc
>> --- makefile.inc	30 Apr 2015 18:50:42 -0000	1.16
>> +++ makefile.inc	18 May 2015 15:15:30 -0000
>> @@ -51,7 +51,7 @@
>>
>>   # Find GCC own include directory and add it to CFLAGS
>>   GCC_INC_DIR := $(shell $(CROSS_GCC) -print-file-name=include)
>> -CFLAGS += -I$(GCC_INC_DIR)
>> +#CFLAGS += -I$(GCC_INC_DIR)
>>
>>   # Pass defines as compiler/assembler switches
>>   CFLAGS += -DGAS_MAJOR=$(GAS_MAJOR)
>>
>> Now do a make clean, recompile and compare the old and new strtod.d:
>>
>> --- strtod.d.bak
>> +++ strtod.d
>> @@ -1,7 +1,6 @@
>>   strtod.o: strtod.c ../../../../include/libc/stubs.h \
>>     ../../../../include/locale.h ../../../../include/math.h \
>>     ../../../../include/stdlib.h ../../../../include/sys/djtypes.h \
>> -  /usr/local/cross-djgpp/lib/gcc/i586-pc-msdosdjgpp/3.4.6/include/float.h
>> \
>>     ../../../../include/float.h ../../../../include/errno.h \
>>     ../../../../include/ctype.h ../../../../include/inlines/ctype.ha \
>>     ../../../../include/inlines/ctype.hp \
>>
>> As you see, -nostdinc does prevent compiler's own headers from being
>> used. But with current cvs as it is, we are telling the compiler to
>> do use its own headers: Not a good idea IMO.
>>
>>
> Including GCC own headers at first is expected behavior.
>

Which djgpp didn't do for 20 years but only since recently,
for why I cannot understand

> There is however one other thing:
>
> Unmodified GCC float.h does NOT include next float.h. See
> https://github.com/gcc-mirror/gcc/blob/master/gcc/ginclude/float.h
>
> For example in my Linux installation  there is no float.h in /usr/include.
>
> Including  next float.h is an additional hack. I modified GCC float.h and
> put there
> #ifdef __DJGPP__
> #include_next <float.h>
> #endif
> near the begin of GCC float.h. As far I verified there is no float.h in
> gcc-3.2, but it appears
> in gcc-3.3. The oldest 3.3 DJGPP port deleted/v2gnu/gcc331b.zip already
> includes DJGPP float.h
> in the begin.
>
> I verified now that for MINGW cross-compiler (I have it installed)
> "#include_next <float.h>" is at
> end of GCC float.h.
> Maybe we should do in the same way. In that way DJGPP definitions would
> override GCC ones instead
> of doing otherwise.
>

That is reasonable: even if djgpp build wouldn't incude gcc's headers
the user programs do, and overriding gcc would be the right thing IMO