[Bug c/19013] New: builtin functions should not rely on target system's C/math library

["jbeulich at novell dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Especially for C99 extensions while compiling in default mode, allowing the use
of builtins that expand to calls to library functions not living in libgcc is
unacceptable, since these will result in (static or dynamic) link failures.
An example is testsuite/gcc.c-torture/execute/ieee/mzero6.c, which calls
__builtin_copysign, and thus fails e.g. for the i686-novell-netware target not
having this function (and also properly not having a prototype for it in any of
the headers).

-- 
           Summary: builtin functions should not rely on target system's
                    C/math library
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jbeulich at novell dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: *-*-*
  GCC host triplet: *-*-*
GCC target triplet: *-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19013