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
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