We use __CHAR_UNSIGNED__ (automatically defined by the AC_C_CHAR_UNSIGNED macro) rather than CHAR_IS_UNSIGNED (defined by custom autoconf code in libjpeg that we didn't port over), although I doubt it matters on any of the platforms we support.

git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@1264 632fc199-4ca6-4c93-a231-07263d6284db

jconfig.txt

@@ -48,7 +48,7 @@
  * If you're not sure, leaving it undefined will work at some cost in speed.
  * If you defined HAVE_UNSIGNED_CHAR then the speed difference is minimal.
  */
-#undef CHAR_IS_UNSIGNED
+#undef __CHAR_UNSIGNED__
 
 /* Define this if your system has an ANSI-conforming <stddef.h> file.
  */

rdbmp.c

@@ -35,7 +35,7 @@
 typedef unsigned char U_CHAR;
 #define UCH(x)	((int) (x))
 #else /* !HAVE_UNSIGNED_CHAR */
-#ifdef CHAR_IS_UNSIGNED
+#ifdef __CHAR_UNSIGNED__
 typedef char U_CHAR;
 #define UCH(x)	((int) (x))
 #else

rdppm.c

@@ -43,7 +43,7 @@
 typedef unsigned char U_CHAR;
 #define UCH(x)	((int) (x))
 #else /* !HAVE_UNSIGNED_CHAR */
-#ifdef CHAR_IS_UNSIGNED
+#ifdef __CHAR_UNSIGNED__
 typedef char U_CHAR;
 #define UCH(x)	((int) (x))
 #else

rdtarga.c

@@ -28,7 +28,7 @@
 typedef unsigned char U_CHAR;
 #define UCH(x)	((int) (x))
 #else /* !HAVE_UNSIGNED_CHAR */
-#ifdef CHAR_IS_UNSIGNED
+#ifdef __CHAR_UNSIGNED__
 typedef char U_CHAR;
 #define UCH(x)	((int) (x))
 #else

win/jconfig.h.in

@@ -12,7 +12,7 @@
 #define HAVE_UNSIGNED_SHORT
 /* #define void char */
 /* #define const */
-#undef CHAR_IS_UNSIGNED
+#undef __CHAR_UNSIGNED__
 #define HAVE_STDDEF_H
 #define HAVE_STDLIB_H
 #undef NEED_BSD_STRINGS