Fix configure problem.

src/backend/port/isinf.c

-/* $Id: isinf.c,v 1.10 1999/07/18 17:38:23 momjian Exp $ */
+/* $Id: isinf.c,v 1.11 1999/07/18 20:43:12 momjian Exp $ */
 
 #include <math.h>
-
 #include "config.h"
 
-#ifdef NOT_USED
-
+#if HAVE_FPCLASS
 #if HAVE_IEEEFP_H
 #include <ieeefp.h>
 #endif
-#if HAVE_FP_CLASS_H
-#include <fp_class.h>
-#endif
-
 int
 isinf(double d)
 {
@@ -29,6 +23,12 @@ isinf(double d)
 	return 0;
 }
 
+#else
+
+#if defined(HAVE_FP_CLASS) || defined(HAVE_FP_CLASS_D)
+#if HAVE_FP_CLASS_H
+#include <fp_class.h>
+#endif
 int
 isinf(x)
 double		x;
@@ -49,3 +49,19 @@ double		x;
 }
 
 #endif
+#endif
+
+#if defined(HAVE_CLASS)
+int
+isinf(double x)
+{
+	int			fpclass = class(x);
+
+	if (fpclass == FP_PLUS_INF)
+		return 1;
+	if (fpclass == FP_MINUS_INF)
+		return -1;
+	return 0;
+}
+
+#endif

src/configure.in

@@ -581,6 +581,7 @@ AC_CHECK_HEADERS(crypt.h)
 AC_CHECK_HEADERS(dld.h)
 AC_CHECK_HEADERS(endian.h)
 AC_CHECK_HEADERS(float.h)
+AC_CHECK_HEADERS(fp_class.h)
 AC_CHECK_HEADERS(history.h)
 AC_CHECK_HEADERS(ieeefp.h)
 AC_CHECK_HEADERS(limits.h)
@@ -665,6 +666,7 @@ AC_TYPE_SIGNAL
 AC_FUNC_VPRINTF
 AC_CHECK_FUNCS(memmove sigsetjmp sysconf)
 AC_CHECK_FUNCS(sigprocmask waitpid setsid fcvt)
+AC_CHECK_FUNCS(fpclass fp_class fp_class_d class)
 dnl We use our snprintf.c emulation if either snprintf() or vsnprintf()
 dnl is missing.  Yes, there are machines that have only one.
 dnl We may also decide to use snprintf.c if snprintf() is present but does
@@ -714,6 +716,11 @@ AC_CHECK_FUNC(inet_aton,
 	      AC_DEFINE(HAVE_INET_ATON),
 	      INET_ATON='inet_aton.o')
 AC_SUBST(INET_ATON)
+AC_CHECK_FUNC(strerror,
+	      AC_DEFINE(HAVE_STRERROR),
+	      [STRERROR='strerror.o' STRERROR2='../../backend/port/strerror.o'])
+AC_SUBST(STRERROR)
+AC_SUBST(STRERROR2)
 AC_CHECK_FUNC(strdup,
 	      AC_DEFINE(HAVE_STRDUP),
 	      STRDUP='../../utils/strdup.o')

src/include/config.h.in

@@ -303,10 +303,21 @@
 /* Set to 1 if you have snprintf() */
 #undef HAVE_SNPRINTF
 
+/* Set to 1 if you have strerror() */
+#undef HAVE_STRERROR
+
 /* Set to 1 if you have vsnprintf() */
 #undef HAVE_VSNPRINTF
 
-/* Set to 1 if you have isinf() */
+/*
+ *	Set to 1 if you have isinf().
+ *	These are all realated to port/isinf.c 
+ */
+#undef HAVE_FPCLASS
+#undef HAVE_FP_CLASS
+#undef HAVE_FP_CLASS_H
+#undef HAVE_FP_CLASS_D
+#undef HAVE_CLASS
 #undef HAVE_ISINF
 #ifndef HAVE_ISINF
 int isinf(double x);