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Message-ID: <55653EB8.8050401@iki.fi>
Date: Wed, 27 May 2015 06:49:12 +0300
From: "Andris Pavenis (andris DOT pavenis AT iki DOT fi)" <djgpp AT delorie DOT com>
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To: djgpp AT delorie DOT com
Subject: Re: limits.h problem in cross-toolchain
References: <CAA2C=vAoqGoWbOXt1_9ab_GyR5OU0siLOMDx1LsOaifLV-YzUA AT mail DOT gmail DOT com>
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Reply-To: djgpp AT delorie DOT com

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).

Andris