[llvm-bugs] [Bug 25965] New: if (x) where x is a float emits a warning with -Wfloat-conversion

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Dec 29 14:06:19 PST 2015


            Bug ID: 25965
           Summary: if (x) where x is a float emits a warning with
           Product: clang
           Version: 3.7
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: gpakosz at pempek.net
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

int main(int argc, char* argv[])
  float f = argc;

  if (f)
    return 1;

  return 0;


$ clang -Wfloat-conversion main.c
main.c:8:7: warning: implicit conversion turns floating-point number into
integer: 'float' to 'bool' [-Wfloat-conversion]
  if (f)
  ~~  ^

As you can see, clang emits a warning while it seems to me everything non 0
should be converted to true.

By comparison, gcc 5.2.0 emits no warning with this sample.

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