[llvm-bugs] [Bug 39652] New: Improve printf format string diagnostics for vector types

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39652

            Bug ID: 39652
           Summary: Improve printf format string diagnostics for vector
                    types
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: OpenCL
          Assignee: unassignedclangbugs at nondot.org
          Reporter: Matthew.Arsenault at amd.com
                CC: anastasia.stulova at arm.com, llvm-bugs at lists.llvm.org

Currently printf format string warnings don't bother checking anything about
the v modifier for vectors.

r346806 includes some example cases that should warn, such as:

// FIXME: This should warn
kernel void format_missing_num_elts(float4 arg)
{
    printf("%vf\n", arg); // expected-no-diagnostics
}

// FIXME: This should warn
kernel void vector_precision_modifier_v4i32(int4 arg)
{
    printf("%.2v4f\n", arg); // expected-no-diagnostics
}

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