https://issues.dlang.org/show_bug.cgi?id=12715

          Issue ID: 12715
           Summary: _compare_fp_t/qsort/bsearch C functions should be
                    nothrow
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: druntime
          Assignee: nobody@puremagic.com
          Reporter: verylonglogin.reg@gmail.com

It's a bad idea to throw exceptions across language boundaries as there is no guarantee a C standard library doesn't use its own exception handler for some reason. So `_compare_fp_t` should be `nothrow`.

Causing pull: https://github.com/D-Programming-Language/druntime/pull/779

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