Some compilers don't permit the use of C99 extensions from C++. This is the

case for MIPSPro (IRIX) for fegetround(), isinf() et al., though they are
available in the math library.

SheepShaver/src/kpx_cpu/src/mathlib/ieeefp-mips.hpp

@@ -0,0 +1,58 @@
+/*
+ *  ieee-mips.hpp - IEE754 Floating-Point Math library, mips specific code
+ *
+ *  Kheperix (C) 2003-2005 Gwenole Beauchesne
+ *  Code derived from the GNU C Library
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef IEEEFP_MIPS_H
+#define IEEEFP_MIPS_H
+
+// 7.6  Floating-point environment <fenv.h>
+#ifndef USE_FENV_H
+
+// Exceptions
+enum {
+    FE_INEXACT = 0x04,
+#define FE_INEXACT		FE_INEXACT
+    FE_UNDERFLOW = 0x08,
+#define FE_UNDERFLOW	FE_UNDERFLOW
+    FE_OVERFLOW = 0x10,
+#define FE_OVERFLOW		FE_OVERFLOW
+    FE_DIVBYZERO = 0x20,
+#define FE_DIVBYZERO	FE_DIVBYZERO
+    FE_INVALID = 0x40,
+#define FE_INVALID		FE_INVALID
+};
+
+#define FE_ALL_EXCEPT	(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
+
+// Rounding modes
+enum {
+  FE_TONEAREST = 0x0,
+#define FE_TONEAREST	FE_TONEAREST
+  FE_TOWARDZERO = 0x1,
+#define FE_TOWARDZERO	FE_TOWARDZERO
+  FE_UPWARD = 0x2,
+#define FE_UPWARD		FE_UPWARD
+    FE_DOWNWARD = 0x3
+#define FE_DOWNWARD		FE_DOWNWARD
+};
+
+#endif
+
+#endif /* IEEEFP_MIPS_H */

SheepShaver/src/kpx_cpu/src/mathlib/ieeefp.hpp

@@ -21,12 +21,22 @@
 #ifndef IEEEFP_H
 #define IEEEFP_H
 
+// Can we use C99 extensions in C++ mode?
+#ifdef HAVE_FENV_H
+#if defined __GNUC__
+#define USE_FENV_H 1
+#endif
+#endif
+
 // Arch-dependent definitions
 #if defined(__i386__)
 #include "mathlib/ieeefp-i386.hpp"
 #endif
+#if defined(__mips__) || (defined(sgi) && defined(mips))
+#include "mathlib/ieeefp-mips.hpp"
+#endif
 
-#ifdef HAVE_FENV_H
+#ifdef USE_FENV_H
 #include <fenv.h>
 #else
 

SheepShaver/src/kpx_cpu/src/mathlib/mathlib.hpp

@@ -175,4 +175,15 @@ extern int mathlib_signbitl(long double x);
 #define isless(x, y) ((x) < (y))
 #endif
 
+// 7.12.3.3  The isinf macro
+#ifndef isinf
+#if defined __sgi && defined __mips
+// specialized implementation for IRIX mips compilers
+extern "C" int _isinf(double);
+extern "C" int _isinff(float);
+static inline int isinf(double x) { return _isinf(x); }
+static inline int isinf(float x) { return _isinff(x); }
+#endif
+#endif
+
 #endif /* MATHLIB_H */