[LLVMbugs] [Bug 8531] New: clang cannot color diagnostics when output is not going to a terminal

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8531

           Summary: clang cannot color diagnostics when output is not
                    going to a terminal
           Product: clang
           Version: 2.8
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Driver
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: richard-llvm at metafoo.co.uk
                CC: llvmbugs at cs.uiuc.edu


clang's compiler driver (lib/Driver/Tools.cpp:1478 or so) refuses to pass
-fcolor-diagnostics on to cc1 if stderr is not a tty. This means you can't get
colored diagnostics out of clang if you're running it through distcc or another
compilation distribution system which doesn't allocate a pty.

It would seem more reasonable to say:
  * if -fno-color-diagnostics is given to the driver, never color diagnostics
  * if -fcolor-diagnostics is given to the driver, always color diagnostics
  * if neither is given, color diagnostics iff stderr is a tty which supports
colors.
Indeed, the comment seems to suggest that this was the intention.

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