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Date: Wed, 27 May 2015 11:20:52 +0300
Message-ID: <CAA2C=vDWp672a-+4Y6i8RygQ_NOMbCYTaaYzmBAigQJXLVFK6A@mail.gmail.com>
Subject: Re: limits.h problem in cross-toolchain
From: "Ozkan Sezer (sezeroz AT gmail DOT com)" <djgpp AT delorie DOT com>
To: djgpp AT delorie DOT com
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On 5/27/15, Andris Pavenis (andris DOT pavenis AT iki DOT fi) <djgpp AT delorie DOT com> wrote:
> On 05/26/2015 11:43 PM, Ozkan Sezer (sezeroz AT gmail DOT com) wrote:
>> In my linux hosted cross-djgpp toolchains, gcc-provided limits.h doesn't
>> include_next the djgpp-provided limits.h, I have to manually correct it.
>> cross-gcc is configured like:
>> ../gcc-3.46/configure --prefix=/usr/local/cross-djgpp
>> --target=i586-pc-msdosdjgpp
>> --with-headers=/usr/local/cross-djgpp/i586-pc-msdosdjgpp/include
>> --enable-languages=c,c++ --disable-libgcj --disable-libada
>> --disable-nls
>>
>> Same thing happens with gcc 3.3.6 and gcc 5.1.0 too.  Before configuring
>> and building gcc, djgpp libs and headers are of course copied under
>> /usr/local/cross-djgpp/i586-pc-msdosdjgpp/
>>
>> $ cat t.c
>> #include <limits.h>
>> #ifndef PATH_MAX
>> #error bad limits.h
>> #endif
>>
>> If I don't correct the installed gcc limits.h myself, the above test
>> surely
>> errors, which is annoying.  What am I missing?
> Known problem. Also easy to avoid
>
> Fragment from gcc/Makefile when building cross-compiler (on my Linux box)
>
> # Default native SYSTEM_HEADER_DIR, to be overridden by targets.
> NATIVE_SYSTEM_HEADER_DIR = /dev/env/DJDIR/include
> # Default cross SYSTEM_HEADER_DIR, to be overridden by targets.
> CROSS_SYSTEM_HEADER_DIR = $(gcc_tooldir)/sys-include
>
> # autoconf sets SYSTEM_HEADER_DIR to one of the above.
> # Purge it of unnecessary internal relative paths
> # to directories that might not exist yet.
> # The sed idiom for this is to repeat the search-and-replace until it
> doesn't match, using :a ... ta.
> # Use single quotes here to avoid nested double- and backquotes, this
> # macro is also used in a double-quoted context.
> SYSTEM_HEADER_DIR = `echo $(CROSS_SYSTEM_HEADER_DIR) | sed -e :a -e
> 's,[^/]*/\.\.\/,,' -e ta`
>
> # Control whether to run fixincludes.
> STMP_FIXINC = stmp-fixinc
>
> # Test to see whether <limits.h> exists in the system header files.
> LIMITS_H_TEST = [ -f $(SYSTEM_HEADER_DIR)/limits.h ]
>
> Some variables in that Makefile:
> libsubdir =
> $(libdir)/gcc/$(real_target_noncanonical)/$(version)$(accel_dir_suffix)
> gcc_tooldir = $(libsubdir)/$(libsubdir_to_prefix)$(target_noncanonical)
>
> In short:
>
> GCC build process expects system.h for prefix=/usr and
> target=i586-pc-msdosdjgpp
> in $(prefix)/$(target)/sys-include but not $(prefix)/$(target)/include
>
> The symptoms are as described in original message if DJGPP own limits.h is
> not found when
> GCC build expects it be located
>
> One can also take a look at RPM files I have put into directory
> /pub/djgpp/rpms and subdirectories
> of ftp.delorie.com (files djcrx*.src.rpm and djcross-gcc-*.src.rpm).
>

I see.  So I tried symlinking or renaming the djgpp includes to
sys-includes and removing any --with-headers configury options, it
does work with gcc 5.1.0, but not with gcc 3.3.6 and 3.4.6 which I
use extensively.  Oh the joys of configuring gcc..

Thanks.

--
O.S.