patch 7.4.1463

Problem:    Configure doesn't find isinf() and isnan() on some systems.
Solution:   Use a configure check that includes math.h.

src/auto/configure

@@ -11858,7 +11858,7 @@ for ac_func in bcmp fchdir fchown fsync getcwd getpseudotty \
 	setpgid setsid sigaltstack sigstack sigset sigsetjmp sigaction \
 	sigvec strcasecmp strerror strftime stricmp strncasecmp \
 	strnicmp strpbrk strtol tgetent towlower towupper iswupper \
-	usleep utime utimes isnan isinf
+	usleep utime utimes
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
@@ -12379,6 +12379,70 @@ if ac_fn_c_try_link "$LINENO"; then :
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }; $as_echo "#define HAVE_FLOAT_FUNCS 1" >>confdefs.h
 
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for isinf()" >&5
+$as_echo_n "checking for isinf()... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#ifdef HAVE_MATH_H
+# include <math.h>
+#endif
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+
+int
+main ()
+{
+int r = isinf(1.11);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }; $as_echo "#define HAVE_ISINF 1" >>confdefs.h
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for isnan()" >&5
+$as_echo_n "checking for isnan()... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#ifdef HAVE_MATH_H
+# include <math.h>
+#endif
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+
+int
+main ()
+{
+int r = isnan(1.11);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }; $as_echo "#define HAVE_ISNAN 1" >>confdefs.h
+
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }

src/configure.in

@@ -3565,7 +3565,7 @@ AC_CHECK_FUNCS(bcmp fchdir fchown fsync getcwd getpseudotty \
 	setpgid setsid sigaltstack sigstack sigset sigsetjmp sigaction \
 	sigvec strcasecmp strerror strftime stricmp strncasecmp \
 	strnicmp strpbrk strtol tgetent towlower towupper iswupper \
-	usleep utime utimes isnan isinf)
+	usleep utime utimes)
 AC_FUNC_FSEEKO
 
 dnl define _LARGE_FILES, _FILE_OFFSET_BITS and _LARGEFILE_SOURCE when
@@ -3668,6 +3668,33 @@ AC_TRY_LINK([
 	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_FLOAT_FUNCS),
 	AC_MSG_RESULT(no))
 
+dnl isinf() and isnan() need to include header files and may need -lm.
+AC_MSG_CHECKING([for isinf()])
+AC_TRY_LINK([
+#ifdef HAVE_MATH_H
+# include <math.h>
+#endif
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+], [int r = isinf(1.11); ],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_ISINF),
+	AC_MSG_RESULT(no))
+
+AC_MSG_CHECKING([for isnan()])
+AC_TRY_LINK([
+#ifdef HAVE_MATH_H
+# include <math.h>
+#endif
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#endif
+], [int r = isnan(1.11); ],
+	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_ISNAN),
+	AC_MSG_RESULT(no))
+
 dnl Link with -lposix1e for ACL stuff; if not found, try -lacl for SGI
 dnl when -lacl works, also try to use -lattr (required for Debian).
 dnl On Solaris, use the acl_get/set functions in libsec, if present.

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1463,
 /**/
     1462,
 /**/