[llvm-bugs] [Bug 30320] New: clang should warn about incorrect "\%" escape sequence

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30320

            Bug ID: 30320
           Summary: clang should warn about incorrect "\%" escape sequence
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

Consider:

void f() { printf("\%\n"); }

cl.exe says something along the lines of

C:\src\chromium4\src\third_party\llvm\projects\compiler-rt\lib\profile\InstrProfilingFile.c(563):
warning C4129: '%': unrecognized character escape sequence
C:\src\chromium4\src\third_party\llvm\projects\compiler-rt\lib\profile\InstrProfilingFile.c(560):
warning C4476: 'fprintf' : unknown type field character 'm' in format specifier

clang's -Wformat should flag this too.

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