[LLVMbugs] [Bug 787] NEW: Windows Native mangles bytecode output using cout

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=787

           Summary: Windows Native mangles bytecode output using cout
           Product: tools
           Version: 1.6
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: llvm-as
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: mtsmith at synopsys.com


When using the Windows native build of version 1.6 (I've seen no sign this was
fixed in 1.7, although testing that is tricky since the win32 build in 1.7 is
pretty unstable) llvm-as output using cout uses text output, replacing newlines
with CR+LF characters, mangling the output.

Examples of this can be found in test case
Regression/Linker/2002-07-17-GlobalFail.ll where the following line has an error:
llvm-as < 2002-07-17-GlobalFail.ll > %s.bc
because the output is being written to stdout and redirected to %s.bc.
This also occurs when getting input from stdin (cin) in llc, lli, llvm-dis, and opt.

A solution to this has been discussed on the mailing list under the name "Binary
output to cout on Windows", and is reposted below, essentially changing the mode
on stdin and stdout to binary.

The code that needs to be run before input/output is done on stdin/stdout is:
  int result = _setmode( _fileno(stdin), _O_BINARY );
  if( result == -1 )
  { std::cerr<<"Cannot set input mode to binary."<<std::endl; return 1; }
  result = _setmode( _fileno(stdout), _O_BINARY );
  if( result == -1 )
  { std::cerr<<"Cannot set output mode to binary."<<std::endl; return 1; }
Error checking included. The files that need to be included for this code are
<cstdio>, <io.h>, and <fcntl.h>.



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