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

4 files changed, 0 insertions, 113 deletions

diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index e7de8f3b2b4..002e0400083 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -104,9 +104,6 @@
 /* Define to 1 if you have the `cbrt' function. */
 #undef HAVE_CBRT
 
-/* Define to 1 if you have the `class' function. */
-#undef HAVE_CLASS
-
 /* Define to 1 if you have the `clock_gettime' function. */
 #undef HAVE_CLOCK_GETTIME
 
@@ -206,18 +203,6 @@
 /* Define to 1 if you have the `fls' function. */
 #undef HAVE_FLS
 
-/* Define to 1 if you have the `fpclass' function. */
-#undef HAVE_FPCLASS
-
-/* Define to 1 if you have the `fp_class' function. */
-#undef HAVE_FP_CLASS
-
-/* Define to 1 if you have the `fp_class_d' function. */
-#undef HAVE_FP_CLASS_D
-
-/* Define to 1 if you have the <fp_class.h> header file. */
-#undef HAVE_FP_CLASS_H
-
 /* Define to 1 if fseeko (and presumably ftello) exists and is declared. */
 #undef HAVE_FSEEKO
 
@@ -295,9 +280,6 @@
 /* Define to 1 if you have the `history_truncate_file' function. */
 #undef HAVE_HISTORY_TRUNCATE_FILE
 
-/* Define to 1 if you have the <ieeefp.h> header file. */
-#undef HAVE_IEEEFP_H
-
 /* Define to 1 if you have the <ifaddrs.h> header file. */
 #undef HAVE_IFADDRS_H
 
@@ -325,9 +307,6 @@
 /* Define to 1 if you have support for IPv6. */
 #undef HAVE_IPV6
 
-/* Define to 1 if you have isinf(). */
-#undef HAVE_ISINF
-
 /* Define to 1 if __builtin_constant_p(x) implies "i"(x) acceptance. */
 #undef HAVE_I_CONSTRAINT__BUILTIN_CONSTANT_P
 
diff --git a/src/include/port.h b/src/include/port.h
index 3f5f90fa007..e40452c1ed0 100644
--- a/src/include/port.h
+++ b/src/include/port.h
@@ -352,9 +352,6 @@ extern int	getpeereid(int sock, uid_t *uid, gid_t *gid);
 #endif
 #endif
 
-#ifndef HAVE_ISINF
-extern int	isinf(double x);
-#else
 /*
  * Glibc doesn't use the builtin for clang due to a *gcc* bug in a version
  * newer than the gcc compatibility clang claims to have. This would cause a
@@ -370,7 +367,6 @@ extern int	isinf(double x);
 #define isinf __builtin_isinf
 #endif							/* __has_builtin(isinf) */
 #endif							/* __clang__ && !__cplusplus */
-#endif							/* !HAVE_ISINF */
 
 #ifndef HAVE_EXPLICIT_BZERO
 extern void explicit_bzero(void *buf, size_t len);
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
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index d1a4f183f3e..8a703385ea2 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -211,7 +211,6 @@ sub GenerateFiles
 		HAVE_BIO_GET_DATA          => undef,
 		HAVE_BIO_METH_NEW          => undef,
 		HAVE_CBRT                  => undef,
-		HAVE_CLASS                 => undef,
 		HAVE_CLOCK_GETTIME         => undef,
 		HAVE_COMPUTED_GOTO         => undef,
 		HAVE_COPYFILE              => undef,
@@ -240,10 +239,6 @@ sub GenerateFiles
 		HAVE_EXPLICIT_BZERO                         => undef,
 		HAVE_FDATASYNC                              => undef,
 		HAVE_FLS                                    => undef,
-		HAVE_FPCLASS                                => undef,
-		HAVE_FP_CLASS                               => undef,
-		HAVE_FP_CLASS_D                             => undef,
-		HAVE_FP_CLASS_H                             => undef,
 		HAVE_FSEEKO                                 => 1,
 		HAVE_FUNCNAME__FUNC                         => undef,
 		HAVE_FUNCNAME__FUNCTION                     => 1,
@@ -269,7 +264,6 @@ sub GenerateFiles
 		HAVE_GSSAPI_H                               => undef,
 		HAVE_HISTORY_H                              => undef,
 		HAVE_HISTORY_TRUNCATE_FILE                  => undef,
-		HAVE_IEEEFP_H                               => undef,
 		HAVE_IFADDRS_H                              => undef,
 		HAVE_INET_ATON                              => undef,
 		HAVE_INT_TIMEZONE                           => 1,
@@ -279,7 +273,6 @@ sub GenerateFiles
 		HAVE_INT_OPTERR                             => undef,
 		HAVE_INT_OPTRESET                           => undef,
 		HAVE_IPV6                                   => 1,
-		HAVE_ISINF                                  => 1,
 		HAVE_I_CONSTRAINT__BUILTIN_CONSTANT_P       => undef,
 		HAVE_KQUEUE                                 => undef,
 		HAVE_LANGINFO_H                             => undef,