[Bug c++/19044] New: Alternate asm name for atan ignored when calling __builtin_atan

["austern at apple dot com" <gcc-bugzilla at gcc dot gnu dot org>]

For atan (and other functions like it), calling __builtin_atan is sometimes supposed to fall back to the 
library version of atan.  In the C++ front end, this interacts poorly with alternate asm names.

Consider the following test case:
#ifdef __cplusplus
extern "C"
#endif
double atan(double x) __asm("_fancy_atan");
double foo(double x) { return __builtin_atan(x); }

When it's compiled as C, it gives the behavior I expect: foo calls _fancy_atan.  The C++ front end, 
however, gets it wrong: we call _atan, ignoring the fact that this function is supposed to have a different 
assembler name.

-- 
           Summary: Alternate asm name for atan ignored when calling
                    __builtin_atan
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: austern at apple dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: powerpc-apple-darwin7.6.0
  GCC host triplet: powerpc-apple-darwin7.6.0
GCC target triplet: powerpc-apple-darwin7.6.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19044