[LLVMbugs] [Bug 17788] New: clang -pedantic -Werror complains about C11 Generics in math.h

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17788

            Bug ID: 17788
           Summary: clang -pedantic -Werror complains about C11 Generics
                    in math.h
           Product: clang
           Version: 3.3
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rakuco at FreeBSD.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

>From <http://article.gmane.org/gmane.os.freebsd.current.scm/5259>: David says
clang should not emit any warnings about Generics being used because math.h is
a system header, and the following snippet should build just fine with `clang
-pedantic -Werror isnan.c`:

  #include <math.h>
  int main() { return isnan(42.); }

At the moment, the build fails on FreeBSD 11-CURRENT with:

isnan.c:2:21: warning: generic selections are a C11-specific feature
[-Wc11-extensions]
int main() { return isnan(42.); }
                    ^
/usr/include/math.h:118:2: note: expanded from macro 'isnan'
        __fp_type_select(x, __inline_isnanf, __inline_isnan, __inline_isnanl)
        ^
/usr/include/math.h:86:39: note: expanded from macro '__fp_type_select'
#define __fp_type_select(x, f, d, ld) _Generic((x),                     \
                                      ^
1 warning generated.

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