bug#24602: grep-2.26 make check fails on i686

[Paul Eggert]

Thanks for reporting a problem. Please run the attached program width.c 
on your platform with your C compiler and the compiler flags you're 
using to build 'grep'. Although width.c should output "sizeof(long)=4 
LONG_WIDTH=32 LONG_MIN=-2147483648 LONG_MAX=2147483647", it appears from 
your build log 
<https://kojipkgs.fedoraproject.org/work/tasks/8044/15928044/build.log> 
that width.c will output "sizeof(long)=4 LONG_WIDTH=64 
LONG_MIN=-2147483648 LONG_MAX=2147483647", i.e., LONG_WIDTH will be wrong.

If I'm right, please investigate why LONG_WIDTH is wrong for your build 
configuration. The symptoms are that of a 32-bit build with a 64-bit C 
preprocessor, at least as far as __LONG_WIDTH__ is concerned. If this is 
a common-enough platform error then I suppose Gnulib should work around 
the implementation bug.

If I'm wrong, please run the following commands and send a compressed 
copy of resulting width.i file.

cd gnulib-tests
gcc -DHAVE_CONFIG_H -DEXEEXT=\"\" -I. -I..  -DIN_GREP_GNULIB_TESTS=1 -I. 
-I. -I.. -I./.. -I../lib -I./../lib -I/usr/include/pcre  -O2 -g -pipe 
-Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions 
-fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches 
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m32 -march=i686 
-mtune=atom -fasynchronous-unwind-tables -E -dD test-limits-h.c >width.i

You mentioned gcc-6.2.1. For what it's worth I didn't observe a problem 
on Fedora 24, which has gcc (GCC) 6.2.1 20160916 (Red Hat 6.2.1-2). A 
compressed copy of my width.i file is attached, for comparison. I built 
with "./configure --without-included-regex --disable-silent-rules 
CFLAGS='-O2 -g -pipe -Wall -Werror=format-security 
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong 
--param=ssp-buffer-size=4 -grecord-gcc-switches 
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m32 -march=i686 
-mtune=atom -fasynchronous-unwind-tables'".

width.c
Description: Text document

width.i.gz
Description: application/gzip