DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org BF07F3858021
To: cygwin AT cygwin DOT com
From: Roger Kaufman <rogerkaufman AT interocitors DOT com>
Subject: Is it possible to define the root directory in a cross compiled
 program
Message-ID: <48b833bd-547a-92eb-542e-b7da8e0d601b@interocitors.com>
Date: Mon, 4 Jan 2021 20:34:05 -0500
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101
 Thunderbird/78.6.0
MIME-Version: 1.0
Content-Language: en-US
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Sender: "Cygwin" <cygwin-bounces AT cygwin DOT com>
Content-Transfer-Encoding: 8bit

When I cross compile the following program, opening /dev/null fails and 
instead the whole install path of /cygwin64/dev/null is visible.

Is there a way to make fopen respect / as the root directory in a cross 
compiled program for windows?

example output...

Roger AT interocitor:~
$ x86_64-w64-mingw32-g++ -o writenull.exe write2null.cc

Roger AT interocitor:~
$ writenull.exe
/dev/null did not succeed


Roger AT interocitor:~
$ gcc -o writenull write2null.cc

Roger AT interocitor:~
$ writenull
/cygwin64/dev/null did not succeed


C Code that was compiled...

#include <cstdio>

int main(int argc, char **argv)
{
   FILE *errfile1 = fopen("/dev/null", "w");
   if (!errfile1) // must be a valid pointer
     errfile1 = stderr;

   FILE *errfile2 = fopen("/cygwin64/dev/null", "w");
   if (!errfile2) // must be a valid pointer
     errfile2 = stderr;

   fprintf(errfile1, "/dev/null did not succeed\n");
   fprintf(errfile2, "/cygwin64/dev/null did not succeed\n");

   return 0;
}
--
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple