[LLVMbugs] [Bug 6987] New: Missing builtins prevent compiling <cmath> in g++ 4.4.3

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6987

           Summary: Missing builtins prevent compiling <cmath> in g++
                    4.4.3
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: chris at bubblescope.net
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


Compiling <cmath> on g++ 4.4.3 requires the intrinsics:

__builtin_isfinite
__builtin_fpclassify

__builtin_isfinite is, I hope, self-explanitory. __builtin_fpclassify is
exactly what is required to implement fpclassify.

If you have trouble reproducing this, make sure your 'bits' directory is set up
correctly. In 4.4 it includes:

#define _GLIBCXX_USE_C99_MATH 1
#define _GLIBCXX_USE_C99_MATH_TR1 1

I discovered this as it also blocks boost on my system, which uses <cmath> in
some places.

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