From 0684806d47969f08e8219c7e46d84aee64b48b32 Mon Sep 17 00:00:00 2001
From: Martijn Dekker <martijn@inlv.org>
Date: Tue, 2 Feb 2021 04:40:09 +0000
Subject: [PATCH] feature tests: signbit detection fix for ia64

An Intel Itanium fix from OpenSUSE:
https://build.opensuse.org/package/view_file/shells/ksh/ksh93-ia64.dif
---
 src/cmd/ksh93/features/math.sh | 12 ++++++++++++
 src/lib/libast/sfio/sfcvt.c    | 10 ++++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/cmd/ksh93/features/math.sh b/src/cmd/ksh93/features/math.sh
index 660e23b1c750..3d9b851ef1a0 100644
--- a/src/cmd/ksh93/features/math.sh
+++ b/src/cmd/ksh93/features/math.sh
@@ -135,6 +135,18 @@ echo "#include <math.h>"
 case $_hdr_ieeefp in
 1)	echo "#include <ieeefp.h>" ;;
 esac
+cat <<!
+#if defined(__ia64__) && defined(signbit)
+# if defined __GNUC__ && __GNUC__ >= 4
+#  define __signbitl(f)		__builtin_signbitl(f)
+# else
+#  include <ast_float.h>
+#  if _lib_copysignl
+#   define __signbitl(f)	(int)(copysignl(1.0,(f))<0.0)
+#  endif
+# endif
+#endif
+!
 echo
 
 : generate the intercept functions and table entries
diff --git a/src/lib/libast/sfio/sfcvt.c b/src/lib/libast/sfio/sfcvt.c
index 8063a5f42604..8f765db42ed7 100644
--- a/src/lib/libast/sfio/sfcvt.c
+++ b/src/lib/libast/sfio/sfcvt.c
@@ -55,6 +55,16 @@ static char		*Zero = "0";
 #endif
 #endif
 
+#if defined(__ia64__) && defined(signbit)
+# if defined __GNUC__ && __GNUC__ >= 4
+#  define __signbitl(f)			__builtin_signbitl(f)
+# else
+#  if _lib_copysignl
+#    define __signbitl(f)	(int)(copysignl(1.0,(f))<0.0)
+#  endif
+# endif
+#endif
+
 #if !_lib_signbit
 #if !_ast_fltmax_double
 static int neg0ld(Sfdouble_t f)