[LLVMbugs] [Bug 8641] New: Clang incorrectly warns of undefined behavior with printf specifier %#X

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8641

           Summary: Clang incorrectly warns of undefined behavior with
                    printf specifier %#X
           Product: clang
           Version: unspecified
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: kevin at sb.org
                CC: llvmbugs at cs.uiuc.edu


Attempting to compile the following line of code:

    printf("%#X\n", 50);

results in a spurious warning:

foo.c:4:14: warning: flag '#' results in undefined behavior with 'X' conversion
      specifier [-Wformat]
    printf("%#X\n", 50);
            ~^~

This is incorrect. The '#' flag applies to 'X' just as well as it does to 'x'.

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