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Subject: Re: ANSI C header files
From: =?ISO-8859-1?Q?K=E5re?= Edvardsen <kare DOT edvardsen AT uit DOT no>
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CC: <marco DOT atzeri AT gmail DOT com>, Csaba Raduly <rcsaba AT gmail DOT com>
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Date: Tue, 4 Oct 2011 15:05:55 +0200
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On Tue, Oct 4, 2011 at 12:13 PM, Marco Atzeri  wrote:
(snip)
> Kare,
> in addition to the TOFU advise,
>
> running configure of grib_api-1.9.9_libtool.tar.gz
> on my XP-SP3 gave no problem.
>
> "Configuration completed."
>
> The ANSI C test is a basic one
>
> configure:6808: checking for ANSI C header files
> configure:6828: gcc -c -g -O2  conftest.c >&5
> configure:6828: $? = 0
> configure:6901: gcc -o conftest.exe -g -O2   conftest.c  >&5
> configure:6901: $? = 0
> configure:6901: ./conftest.exe
> configure:6901: $? = 0
> configure:6912: result: yes
> 
> I reproduced the hang on my Cygwin CYGWIN_NT-6.0  1.7.9(0.237/5/3)
> 2011-03-29 10:10 i686 Cygwin
> and gcc version 4.5.3
> 
> This appears to be the critical spot (line 6820-6828)
> 
> if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
>   $EGREP "memchr" >/dev/null 2>&1; then
>   :
> else
>   ac_cv_header_stdc=no
> fi
> 
> It tries to run the preprocessor and pipe its output into egrep.
> Unfortunately, the EGREP variable appears to be empty, so the end
> result is similar to:
> 
> gcc -E conftest.c | memchr
> 
> Trying the above from the bash prompt (in both mintty and classic
> Cygwin prompt) results in an (unkillable from Cygwin) cc1.exe which is
> perpetually waiting for output:
> 
> $ ps
>       PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
>      4484       1    4484       4752  con 539771   Oct  3 /usr/bin/XWin
>      7848       1    7848       7848    ? 539771 14:03:11 /usr/bin/mintty
>      6468    7848    6468       7460    1 539771 14:03:11 /usr/bin/bash
>      6692       1    6692       6692    ? 539771 10:12:37 /usr/bin/mintty
>      4600    6692    4600       7156    3 539771 10:12:37 /usr/bin/ssh
>      6272    6468    6272       6356    1 539771 13:08:43 /usr/bin/gcc-4
> O    7492    6272    6272       6856    1 539771 13:08:43
> /usr/lib/gcc/i686-pc-cygwin/4.5.3/cc1
>      7404    6468    7404        524    1 539771 13:08:46 /usr/bin/ps
> 
> 
> So, the workaround is to replace $EGREP with egrep in configure; then
> configure runs successfully.
> 
> This seems to be some peculiarity of Cygwin's current GCC 4.5.3;
> neither GCC 3.4.4 in Cygwin 1.7 nor GCC 4.3.4 in Cygwin 1.7 nor GCC
> 4.3.2 in Cygwin 1.5 exhibit this hang.
> 
> Csaba

Csaba & Marco.

Marco: Your try on the XP-SP3 gave no problem. My try on Win 7 Pro
hangs, but as Csaba points out: This seems to be some peculiarity of
Cygwin's current GCC 4.5.3

Csaba: Replacing $EGREP with egrep in configure did make the difference!

Thanx to both of you for excellent help.

Regards,
Kare


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