Re: cygwin 1.1.7 and cross builds

[Joel Sherrill <joel.sherrill@OARcorp.com>]

Peter Shoebridge wrote:
> 
> Dave Fiddes added a magic number check into a build of Cygwin ages ago. Yes,
> NT/2k seems to execute the code without checking the exe and get stuck in a
> loop. You can kill the process and configure continues.

I thought this sounded like the same problem David fixed.

> Unfortunately, opening the exe file and checking the magic number before
> every command is run does slow Cygwin down somewhat.

Of course, locking up REALLY slows things down. :)

I wonder if there is any way to get an official solution to this problem
so it will go away forever.  I would be happy with an environment
variable
to enable/disable this if nothing else.  Then at least configure would
work.

Thanks.

> Peter Shoebridge
> 
> ----- Original Message -----
> From: "Joel Sherrill" <joel.sherrill@OARcorp.com>
> To: <crossgcc@sources.redhat.com>; "Ralf Corsepius"
> <corsepiu@faw.uni-ulm.de>
> Sent: Monday, January 08, 2001 11:05 AM
> Subject: cygwin 1.1.7 and cross builds
> 
> > Hi,
> >
> > I am using the current net release of Cygwin to build RTEMS to
> > target an m68k (ELF format).  When the configure script tries
> > to see if the cross compiler works, it will execute this
> > fragment from a configure script:
> >
> > ================
> > cat > conftest.$ac_ext << EOF
> >
> > #line 1253 "configure"
> > #include "confdefs.h"
> >
> > main(){return(0);}
> > EOF
> > if { (eval echo configure:1258: \"$ac_link\") 1>&5; (eval $ac_link)
> > 2>&5; } &&
> > t
> > est -s conftest${ac_exeext}; then
> >   ac_cv_prog_cc_works=yes
> >   # If we can't run a trivial program, we are probably using a cross
> > compiler.
> >   if (./conftest; exit) 2>/dev/null; then
> > =================
> >
> > Cygwin under WinME/95 passes this test and apparently refuses to run
> > "./conftest".
> > Cygwin under WinNT/2000 allows ./conftest to be executed.  Even worse,
> > this
> > conftest will execute enough to go into a hard loop which can't be
> > killed with
> > <ctl>-C.
> >
> > I believe that Cygwin should refuse to execute this program.  Is there
> > any provision for checking a magic number on the executable?
> >
> > Has anyone else seen anything like this?
> >
> > I can provide the executable if this is desired.
> >
> >
> > --
> > Joel Sherrill, Ph.D.             Director of Research & Development
> > joel@OARcorp.com                 On-Line Applications Research
> > Ask me about RTEMS: a free RTOS  Huntsville AL 35805
> >    Support Available             (256) 722-9985
> >
> > ------
> > Want more information?  See the CrossGCC FAQ,
> http://www.objsw.com/CrossGCC/
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> >
> 
> ------
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-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel@OARcorp.com                 On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
   Support Available             (256) 722-9985

------
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