[llvm-bugs] [Bug 39486] New: printf vector conversion specifier produces incorrect warning

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39486

            Bug ID: 39486
           Summary: printf vector conversion specifier produces incorrect
                    warning
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: OpenCL
          Assignee: unassignedclangbugs at nondot.org
          Reporter: J.Price at bristol.ac.uk
                CC: anastasia.stulova at arm.com, llvm-bugs at lists.llvm.org,
                    Matthew.Arsenault at amd.com

As of r343653, Clang now produces a warning when using the 'v' conversion
specifier in a printf format string, which it shouldn't (when compiling for
OpenCL).


Example kernel:

    kernel void foo(float4 arg)
    {
      printf("%.2v4f\n", arg);
    }


Clang Output:

    foo.cl:3:14: warning: invalid conversion specifier 'v'
      printf("%.2v4f\n", arg);
              ~~~^
    1 warning generated.

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