Assume that we have isinf().

Windows has this, and so do all other live platforms according to the
buildfarm, so remove the configure probe and src/port/ substitution.

This also lets us get rid of some configure probes that existed only
to support src/port/isinf.c.  I kept the port.h hack to force using
__builtin_isinf() on clang, though.

This is part of a series of commits to get rid of no-longer-relevant
configure checks and dead src/port/ code.  I'm committing them separately
to make it easier to back out individual changes if they prove less
portable than I expect.

Discussion: https://postgr.es/m/15379.1582221614@sss.pgh.pa.us

1 files changed, 0 insertions, 81 deletions

diff --git a/src/port/isinf.c b/src/port/isinf.c
deleted file mode 100644
index 9bb40bc704a..00000000000
--- a/src/port/isinf.c
+++ /dev/null
@@ -1,81 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * isinf.c
- *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- *	  src/port/isinf.c
- *
- *-------------------------------------------------------------------------
- */
-
-#include "c.h"
-
-#include <float.h>
-#include <math.h>
-
-#if HAVE_FPCLASS				/* this is _not_ HAVE_FP_CLASS, and not typo */
-
-#if HAVE_IEEEFP_H
-#include <ieeefp.h>
-#endif
-
-int
-isinf(double d)
-{
-	fpclass_t	type = fpclass(d);
-
-	switch (type)
-	{
-		case FP_NINF:
-		case FP_PINF:
-			return 1;
-		default:
-			break;
-	}
-	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(double x)
-{
-#if HAVE_FP_CLASS
-	int			fpclass = fp_class(x);
-#else
-	int			fpclass = fp_class_d(x);
-#endif
-
-	if (fpclass == FP_POS_INF)
-		return 1;
-	if (fpclass == FP_NEG_INF)
-		return -1;
-	return 0;
-}
-
-#elif 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
-
-#endif