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From:	Jay <jayk123 AT hotmail DOT com>
To:	<cygwin AT sourceware DOT org>
Subject:	RE: flex: exec failed?
Date:	Thu, 31 Jul 2008 12:45:45 +0000
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 Ok, it works the same on Cygwin and Linux/x86, but Python/NTAMD64 works. 
 Somehow Python/Posix related, portably.

 For anyone interested: 
 
  $ echo %%> conftest.l    
  $ echo %%>> conftest.l    
  $ rm lex.yy.c   
  $ export M4=foo    
  $ flex conftest.l   
  flex: fatal internal error, exec failed  
  lex.yy.c exists  

  $ rm lex.yy.c 
  $ python -c "import os; os.system(\"flex conftest.l\")"  
   flex: fatal internal error, exec failed    
   flex: 2 error writing output file lex.yy.c  (I added the "2" to disambiguate 4 identical error messages)  
  lex.yy.c does not exists -- make configure-gmp fails   

  relevant code in flex:  

  filter_tee_header:  
  	if ((to_cfd = dup (1)) == -1) 
  		flexfatal (_("dup(1) failed"));  
  	to_c = fdopen (to_cfd, "w");  
...
	fflush (to_c);  
	if (ferror (to_c))  
		lerrsf (_("2 error writing output file %s"),  
			outfilename ? outfilename : "");  

	else if (fclose (to_c))  
		lerrsf (_("error closing output file %s"),  
			outfilename ? outfilename : "");  

	while (wait (0)> 0) ;  


  again, I added the "2".  

  Digging deeper...

 - Jay


 [snip snip snip] 

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