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Date:	Tue, 04 Oct 2011 13:35:55 +0200
From:	Marco Atzeri <marco DOT atzeri AT gmail DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Re: ANSI C header files
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On 10/4/2011 1:24 PM, Csaba Raduly wrote:
> 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
Hi Csaba,

the configure  looks for grep/egrep/fgrep

configure:3610: checking for grep that handles long lines and -e
configure:3668: result: /usr/bin/grep
configure:3673: checking for egrep
configure:3735: result: /usr/bin/grep -E
configure:3740: checking for fgrep
configure:3802: result: /usr/bin/grep -F

and set them

config.status:GREP='/usr/bin/grep'
config.status:EGREP='/usr/bin/grep -E'
config.status:FGREP='/usr/bin/grep -F'

same compiler

$ cygcheck -c -d gcc4
Cygwin Package Information
Package              Version
gcc4                 4.5.3-2

but I am running the last cygwin snapshot

$ uname -srv
CYGWIN_NT-5.1 1.7.10s(0.251/5/3) 20110829 15:53:50

Regards
Marco

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