[LLVMbugs] [Bug 9987] New: -Wextra overrides earlier -Wno-sign-compare

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9987

           Summary: -Wextra overrides earlier -Wno-sign-compare
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Driver
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: joerg at NetBSD.org
                CC: llvmbugs at cs.uiuc.edu


For GCC, the -Wall and -Wextra (aka -W) options are supposed to set the warning
defaults and -Wno-* can be used to disable options again. This doesn't work as
expected with clang.

Consider the following input:

int main(void)
{
    int a = 0;
    unsigned int b = 1;
    return a < b ? 1 : 2;
}

clang -Wextra -Wno-sign-compare -c test.c
is silent.

clang -Wno-sign-compare -Wextra -c test.c
warns, when it should be silent (and the diagnostic message is kind of
confusion).

GCC doesn't warn in either case.

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