[netbsd] Parrot on netbsd-alpha gets killed by SIGFPE when calculating Inf.

From: Mark Glines <mark@glines.org>

he> Non-portable: #define PARROT_FLOATVAL_INF_POSITIVE  floatval_divide_by_zero(interp, 1.0)
he> On alpha, doing that will land you a SIGFPE.

he++ provided this patch which allows parrot to pass "make test".
---

 MANIFEST                          |    2 +
 config/gen/platform/netbsd/misc.c |   58 +++++++++++++++++++++++++++++++++++++
 config/gen/platform/netbsd/misc.h |   19 ++++++++++++
 include/parrot/datatypes.h        |   13 ++++++--
 src/main.c                        |    7 ++++
 5 files changed, 96 insertions(+), 3 deletions(-)
 create mode 100644 config/gen/platform/netbsd/misc.c
 create mode 100644 config/gen/platform/netbsd/misc.h


diff --git a/MANIFEST b/MANIFEST
index 5de2d66..b29f0ed 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -359,6 +359,8 @@ config/gen/platform/generic/threads.h                       []
 config/gen/platform/generic/time.c                          []
 config/gen/platform/ia64/asm.s                              []
 config/gen/platform/netbsd/math.c                           []
+config/gen/platform/netbsd/misc.c                           []
+config/gen/platform/netbsd/misc.h                           []
 config/gen/platform/openbsd/math.c                          []
 config/gen/platform/openbsd/memexec.c                       []
 config/gen/platform/openbsd/misc.h                          []
diff --git a/config/gen/platform/netbsd/misc.c b/config/gen/platform/netbsd/misc.c
new file mode 100644
index 0000000..877a7a0
--- /dev/null
+++ b/config/gen/platform/netbsd/misc.c
@@ -0,0 +1,58 @@
+/*
+ * $Id$
+ * Copyright (C) 2009, Parrot Foundation.
+ */
+
+/*
+
+=head1 NAME
+
+config/gen/platform/netbsd/misc.c
+
+=head1 DESCRIPTION
+
+Miscellaneous helper functions that are specific to NetBSD.
+
+=head2 Functions
+
+=over 4
+
+=cut
+
+*/
+
+/*
+
+=item C<void Parrot_platform_init_code(void)>
+
+Initialize Parrot for the NetBSD platform.
+So far only turns off SIGFPE for Alpha.
+
+=cut
+
+*/
+
+#include <signal.h>
+
+void
+Parrot_platform_init_code(void)
+{
+#if defined(__alpha__)
+    signal(SIGFPE, SIG_IGN);
+#endif
+}
+
+/*
+
+=back
+
+=cut
+
+*/
+
+/*
+ * Local variables:
+ *   c-file-style: "parrot"
+ * End:
+ * vim: expandtab shiftwidth=4:
+ */
diff --git a/config/gen/platform/netbsd/misc.h b/config/gen/platform/netbsd/misc.h
new file mode 100644
index 0000000..2e38bd0
--- /dev/null
+++ b/config/gen/platform/netbsd/misc.h
@@ -0,0 +1,19 @@
+/*
+ * $Id$
+ * Copyright (C) 2009, Parrot Foundation.
+ */
+
+#ifndef PARROT_PLATFORM_NETBSD_MISC_H_GUARD
+#  define PARROT_PLATFORM_NETBSD_MISC_H_GUARD
+
+#  define PARROT_HAS_PLATFORM_INIT_CODE
+void Parrot_platform_init_code(void);
+
+#endif /* PARROT_PLATFORM_NETBSD_MISC_H_GUARD */
+
+/*
+ * Local variables:
+ *   c-file-style: "parrot"
+ * End:
+ * vim: expandtab shiftwidth=4:
+ */
diff --git a/include/parrot/datatypes.h b/include/parrot/datatypes.h
index 737304f..3819a39 100644
--- a/include/parrot/datatypes.h
+++ b/include/parrot/datatypes.h
@@ -123,9 +123,16 @@ const struct _data_types data_types[] = {
 };
 #endif /* INSIDE_GLOBAL_SETUP */
 
-#define PARROT_FLOATVAL_INF_POSITIVE  floatval_divide_by_zero(interp, 1.0)
-#define PARROT_FLOATVAL_INF_NEGATIVE  floatval_divide_by_zero(interp, -1.0)
-#define PARROT_FLOATVAL_NAN_QUIET     floatval_divide_by_zero(interp, 0.0)
+#if defined(__NetBSD__) && defined(__alpha__)
+#  include <math.h>
+#  define PARROT_FLOATVAL_INF_POSITIVE	INFINITY
+#  define PARROT_FLOATVAL_INF_NEGATIVE	-INFINITY
+#  define PARROT_FLOATVAL_NAN_QUIET	NAN
+#else
+#  define PARROT_FLOATVAL_INF_POSITIVE  floatval_divide_by_zero(interp, 1.0)
+#  define PARROT_FLOATVAL_INF_NEGATIVE  floatval_divide_by_zero(interp, -1.0)
+#  define PARROT_FLOATVAL_NAN_QUIET     floatval_divide_by_zero(interp, 0.0)
+#endif
 
 #define PARROT_CSTRING_INF_POSITIVE    "Inf"
 #define PARROT_CSTRING_INF_NEGATIVE    "-Inf"
diff --git a/src/main.c b/src/main.c
index 92760ff..44b41f1 100644
--- a/src/main.c
+++ b/src/main.c
@@ -20,6 +20,9 @@ Start Parrot
 
 #include <stdio.h>
 #include <string.h>
+#if defined(__NetBSD__) && defined(__alpha__)
+#  include <signal.h>
+#endif
 
 #include "parrot/parrot.h"
 #include "parrot/embed.h"
@@ -42,6 +45,10 @@ main(int argc, char * argv[])
     Interp  *interp;
     int      status;
 
+#if defined(__NetBSD__) && defined(__alpha__)
+    signal(SIGFPE, SIG_IGN); /* ignore invalid operations/results */
+#endif
+
     /* internationalization setup */
     /* setlocale(LC_ALL, ""); */
     PARROT_BINDTEXTDOMAIN(PACKAGE, LOCALEDIR);