Configure: fix doubleinfbytes=undef ...

    #define DOUBLEINFBYTES undef is illegal

Note that the undef in config_h.SH needs to have a
space before and after, no tab!
Needs to be backported.

Author: rurban

Configure

@@ -20704,6 +20704,7 @@ int main(int argc, char *argv[]) {
   return 0;
 }
 EOP
+empty=0x0
 set try
 if eval $compile; then
     doubleinfbytes=`$run ./try 1`
@@ -20750,12 +20751,12 @@ else
        doublenanbytes='0x00, 0x00, 0x00, 0x00, 0x7f, 0xf8, 0x00, 0x00'
        ;;
     9|10|11|12|13|14) # VAX/Cray/IBM floating point formats, no inf/nan.
-       doubleinfbytes=$undef
-       doublenanbytes=$undef
+       doubleinfbytes=$empty
+       doublenanbytes=$empty
        ;;
     *) # No idea.
-       doubleinfbytes=$undef
-       doublenanbytes=$undef
+       doubleinfbytes=$empty
+       doublenanbytes=$empty
        ;;
     esac
     case "$longdblkind" in
@@ -20778,8 +20779,8 @@ else
            longdblnanbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
            ;;
        *)  # No idea.
-           longdblinfbytes=$undef
-           longdblnanbytes=$undef
+           longdblinfbytes=$empty
+           longdblnanbytes=$empty
        ;;
        esac
        ;;
@@ -20794,8 +20795,8 @@ else
            longdblnanbytes='0x7f, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
            ;;
        *)  # No idea.
-           longdblinfbytes=$undef
-           longdblnanbytes=$undef
+           longdblinfbytes=$empty
+           longdblnanbytes=$empty
        ;;
        esac
        ;;
@@ -20816,27 +20817,27 @@ else
        longdblnanbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
        ;;
     9|10|11|12|13|14) # VAX/Cray/IBM floating point formats, no inf/nan.
-       longdblinfbytes=$undef
-       longdblnanbytes=$undef
+       longdblinfbytes=$empty
+       longdblnanbytes=$empty
        ;;
     *) # No idea.
-       longdblinfbytes=$undef
-       longdblnanbytes=$undef
+       longdblinfbytes=$empty
+       longdblnanbytes=$empty
        ;;
     esac
 fi
 # In case the program crashed the values are empty, turn them undef.
 case "$doubleinfbytes" in
-'') doubleinfbytes=$undef ;;
+'') doubleinfbytes=$empty ;;
 esac
 case "$doublenanbytes" in
-'') doublenanbytes=$undef ;;
+'') doublenanbytes=$empty ;;
 esac
 case "$longdblinfbytes" in
-'') longdblinfbytes=$undef ;;
+'') longdblinfbytes=$empty ;;
 esac
 case "$longdblnanbytes" in
-'') longdblnanbytes=$undef ;;
+'') longdblnanbytes=$empty ;;
 esac
 $rm_try
 
@@ -20863,7 +20864,7 @@ set try
 if eval $compile; then
     doublemantbits=`$run ./try`
 else
-    doublemantbits="$undef"
+    doublemantbits="$empty"
 fi
 $rm_try
 
@@ -20905,7 +20906,7 @@ set try
 if eval $compile; then
     longdblmantbits=`$run ./try`
 else
-    longdblmantbits="$undef"
+    longdblmantbits="$empty"
 fi
 $rm_try
 
@@ -20920,7 +20921,7 @@ else
      if test "X$nvsize" = "X$longdblsize"; then
        nvmantbits="$longdblmantbits"
      else
-       nvmantbits="$undef"
+       nvmantbits="$empty"
      fi
   fi
 fi

config_h.SH

@@ -42,7 +42,7 @@ case "$CONFIG_H" in
 already-done) echo "Not re-extracting config.h" ;;
 *)
 echo "Extracting $CONFIG_H (with variable substitutions)"
-sed <<!GROK!THIS! >$CONFIG_H -e 's!^#undef\(.*/\)\*!/\*#define\1 \*!' -e 's!^#un-def!#undef!'
+sed <<!GROK!THIS! >$CONFIG_H -e 's!^#undef\(.*/\)\*!/\*#define\1 \*!' -e 's!^#un-def!#undef!' -e 's!^#define \(.*\) undef !#undef \1!'
 /* This file was produced by running the config_h.SH script, which
  * gets its values from $CONFIG_SH, which is generally produced by
  * running Configure.
@@ -4940,10 +4940,11 @@ sed <<!GROK!THIS! >$CONFIG_H -e 's!^#undef\(.*/\)\*!/\*#define\1 \*!' -e 's!^#un
  *	This symbol, if defined, is a comma-separated list of
  *	hexadecimal bytes (0xHH) for the long double precision not-a-number.
  */
-#define DOUBLEINFBYTES  $doubleinfbytes		/**/
-#define DOUBLENANBYTES  $doublenanbytes		/**/
-#define LONGDBLINFBYTES $longdblinfbytes		/**/
-#define LONGDBLNANBYTES $longdblnanbytes		/**/
+/* Do not change the whitespace here! */
+#define DOUBLEINFBYTES $doubleinfbytes 		/**/
+#define DOUBLENANBYTES $doublenanbytes 		/**/
+#define LONGDBLINFBYTES $longdblinfbytes        /**/
+#define LONGDBLNANBYTES $longdblnanbytes 	/**/
 
 /* PERL_PRIfldbl:
  *	This symbol, if defined, contains the string used by stdio to

uconfig.h

@@ -4895,10 +4895,11 @@
  *	This symbol, if defined, is a comma-separated list of
  *	hexadecimal bytes (0xHH) for the long double precision not-a-number.
  */
-#define DOUBLEINFBYTES  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x7f		/**/
-#define DOUBLENANBYTES  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0x7f		/**/
-#define LONGDBLINFBYTES 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00		/**/
-#define LONGDBLNANBYTES 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00		/**/
+/* Do not change the whitespace here! */
+#define DOUBLEINFBYTES 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x7f 		/**/
+#define DOUBLENANBYTES 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0x7f 		/**/
+#define LONGDBLINFBYTES 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00        /**/
+#define LONGDBLNANBYTES 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 	/**/
 
 /* PERL_PRIfldbl:
  *	This symbol, if defined, contains the string used by stdio to
@@ -5462,6 +5463,6 @@
 #endif
 
 /* Generated from:
- * e013bc0d68c81922e2d705bcae12699014b3b7be2ea930bb7ba15d530e8b03a7 config_h.SH
+ * bdf8c287b1124deeaebb23cde724d74db1836c39645b19a574487a858153c7f5 config_h.SH
  * 8c426d198fb3d779629e9652bcb55fc5d6e56b80689f6d1e583eb377755875e1 uconfig.sh
  * ex: set ro: */