[LLVMbugs] [Bug 9774] New: False -Wunreachable-code warning in conditional expression

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9774

           Summary: False -Wunreachable-code warning in conditional
                    expression
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: markus at oberhumer.com
                CC: llvmbugs at cs.uiuc.edu


The following typescript shows that clang incorrectly warns about
unreachable code when using the ternary "if" operator:

$ cat test.c
#define MY_MAX(a,b)     ((a) >= (b) ? (a) : (b))

void foo(int *s)
{
    for (int i = 0; i < MY_MAX(2, 3); i++)
        s[i] = 0;
}

$ clang -Wunreachable-code -c test.c
test.c:5:25: warning: will never be executed [-Wunreachable-code]
    for (int i = 0; i < MY_MAX(2, 3); i++)
                        ^~~~~~~~~~~~
test.c:5:32: note: instantiated from:
    for (int i = 0; i < MY_MAX(2, 3); i++)
                               ^
1 warning generated.

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