2005-03-17 Jeff Johnston <jjohnstn@redhat.com>

        * configure.in: Add new check to see if compiler supports
        aliasing of arrays and define _HAVE_ARRAY_ALIASING if true.
        * configure: Regenerated.
        * Makefile.in: Ditto.
        * newlib.hin: Add _HAVE_ARRAY_ALIASING.
        * libc/ctype/ctype_.c: Check for _HAVE_ARRAY_ALIASING before
        aliasing the _ctype_ array to _ctype_b.
        * libc/include/ctype.h: Change macros to use __ctype_ptr.  Mark
        _ctype_ as deprecated.

7 files changed, 106 insertions, 20 deletions

diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index 71fba5d6c..34986d349 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,15 @@
+2005-03-17  Jeff Johnston  <jjohnstn@redhat.com>
+
+	* configure.in: Add new check to see if compiler supports
+	aliasing of arrays and define _HAVE_ARRAY_ALIASING if true.
+	* configure: Regenerated.
+	* Makefile.in: Ditto.
+	* newlib.hin: Add _HAVE_ARRAY_ALIASING.
+	* libc/ctype/ctype_.c: Check for _HAVE_ARRAY_ALIASING before
+	aliasing the _ctype_ array to _ctype_b.
+	* libc/include/ctype.h: Change macros to use __ctype_ptr.  Mark
+	_ctype_ as deprecated.
+
 2005-03-17  Hans-Peter Nilsson  <hp@axis.com>
 
 	* configure.host (newlib_cflags) <cris-*-*, crisv32-*-*>: Add
diff --git a/newlib/Makefile.in b/newlib/Makefile.in
index c4fa86e2b..caaa6f767 100644
--- a/newlib/Makefile.in
+++ b/newlib/Makefile.in
@@ -103,6 +103,7 @@ SYS_OBJECTLIST = @SYS_OBJECTLIST@
 UNIX_OBJECTLIST = @UNIX_OBJECTLIST@
 VERSION = @VERSION@
 aext = @aext@
+libc_cv_array_aliasing = @libc_cv_array_aliasing@
 libc_cv_initfinit_array = @libc_cv_initfinit_array@
 libm_machine_dir = @libm_machine_dir@
 machine_dir = @machine_dir@
diff --git a/newlib/configure b/newlib/configure
index 48ce0d37c..f43bcb115 100755
--- a/newlib/configure
+++ b/newlib/configure
@@ -3459,6 +3459,34 @@ EOF
 
 fi
 
+echo $ac_n "checking for array aliasing support""... $ac_c" 1>&6
+echo "configure:3464: checking for array aliasing support" >&5
+if eval "test \"`echo '$''{'libc_cv_array_aliasing'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.c <<EOF
+char x3 = { 'a', 'b', 'c' };
+extern char y2 __attribute__((alias ("x+1")));
+EOF
+if { ac_try='${CC} $CFLAGS $CPPFLAGS -c conftest.c
+		   1>&AS_MESSAGE_LOG_FD'; { (eval echo configure:3473: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; }
+then
+  libc_cv_array_aliasing=yes
+else
+  libc_cv_array_aliasing=no
+fi
+rm -f conftest*
+fi
+
+echo "$ac_t""$libc_cv_array_aliasing" 1>&6
+
+if test $libc_cv_array_aliasing = yes; then
+  cat >> confdefs.h <<EOF
+#define _HAVE_ARRAY_ALIASING 1
+EOF
+
+fi
+
 trap '' 1 2 15
 cat > confcache <<\EOF
 # This file is a shell script that caches the results of configure
@@ -3676,6 +3704,7 @@ s%@UNIX_OBJECTLIST@%$UNIX_OBJECTLIST%g
 s%@STDIO64_OBJECTLIST@%$STDIO64_OBJECTLIST%g
 s%@CC_FOR_BUILD@%$CC_FOR_BUILD%g
 s%@libc_cv_initfinit_array@%$libc_cv_initfinit_array%g
+s%@libc_cv_array_aliasing@%$libc_cv_array_aliasing%g
 
 CEOF
 EOF
diff --git a/newlib/configure.in b/newlib/configure.in
index d666136a1..84e1f745a 100644
--- a/newlib/configure.in
+++ b/newlib/configure.in
@@ -354,6 +354,25 @@ if test $libc_cv_initfinit_array = yes; then
   AC_DEFINE_UNQUOTED(HAVE_INITFINI_ARRAY)
 fi
 
+AC_CACHE_CHECK(for array aliasing support,
+	       libc_cv_array_aliasing, [dnl
+cat > conftest.c <<EOF
+char x[3] = { 'a', 'b', 'c' };
+extern char y[2] __attribute__((alias ("x+1")));
+EOF
+if AC_TRY_COMMAND([${CC} $CFLAGS $CPPFLAGS -c conftest.c
+		   1>&AS_MESSAGE_LOG_FD])
+then
+  libc_cv_array_aliasing=yes
+else
+  libc_cv_array_aliasing=no
+fi
+rm -f conftest*])
+AC_SUBST(libc_cv_array_aliasing)
+if test $libc_cv_array_aliasing = yes; then
+  AC_DEFINE_UNQUOTED(_HAVE_ARRAY_ALIASING)
+fi
+
 AC_OUTPUT(Makefile,
 [if test -n "$CONFIG_FILES"; then
   unset ac_file
diff --git a/newlib/libc/ctype/ctype_.c b/newlib/libc/ctype/ctype_.c
index 9991dd222..5551dbdc9 100644
--- a/newlib/libc/ctype/ctype_.c
+++ b/newlib/libc/ctype/ctype_.c
@@ -84,21 +84,40 @@ static _CONST char _ctype_b[128 + 256] = {
 	_CTYPE_DATA_128_256
 };
 
-#if defined(__CYGWIN__)
-extern _CONST char __declspec(dllexport) _ctype_[1 + 256] __attribute__ ((alias ("_ctype_b+127")));
+#  if defined(__CYGWIN__)
 _CONST char __declspec(dllexport) *__ctype_ptr = _ctype_b + 128;
-#else
-extern _CONST char _ctype_[1 + 256] __attribute__ ((alias ("_ctype_b+127")));
+#  else
 _CONST char *__ctype_ptr = _ctype_b + 128;
-#endif
+#  endif
+
+#  if defined(_HAVE_ARRAY_ALIASING)
+
+#    if defined(__CYGWIN__)
+extern _CONST char __declspec(dllexport) _ctype_[1 + 256] __attribute__ ((alias ("_ctype_b+127")));
+#    else
+extern _CONST char _ctype_[1 + 256] __attribute__ ((alias ("_ctype_b+127")));
+#    endif
+
+#  else /* !_HAVE_ARRAY_ALIASING */
+
+#    if defined(__CYGWIN__)
+_CONST char __declspec(dllexport) _ctype_[1 + 256] = {
+#    else
+_CONST char _ctype_[1 + 256] = {
+#    endif
+	0,
+	_CTYPE_DATA_0_127,
+	_CTYPE_DATA_128_256
+};
+#  endif /* !_HAVE_ARRAY_ALIASING */
 
 #else	/* !defined(ALLOW_NEGATIVE_CTYPE_INDEX) */
 
-#if defined(__CYGWIN__)
+# if defined(__CYGWIN__)
 _CONST char __declspec(dllexport) _ctype_[1 + 256] = {
-#else
+# else
 _CONST char _ctype_[1 + 256] = {
-#endif
+# endif
 	0,
 	_CTYPE_DATA_0_127,
 	_CTYPE_DATA_128_256
diff --git a/newlib/libc/include/ctype.h b/newlib/libc/include/ctype.h
index a3581df1b..9dccac319 100644
--- a/newlib/libc/include/ctype.h
+++ b/newlib/libc/include/ctype.h
@@ -36,20 +36,23 @@ int _EXFUN(_toupper, (int __c));
 #define _X	0100
 #define	_B	0200
 
-extern	__IMPORT _CONST char	_ctype_[];
+extern	__IMPORT _CONST char	*__ctype_ptr;
 
 #ifndef __cplusplus
-#define	isalpha(c)	((_ctype_+1)[(unsigned)(c)]&(_U|_L))
-#define	isupper(c)	((_ctype_+1)[(unsigned)(c)]&_U)
-#define	islower(c)	((_ctype_+1)[(unsigned)(c)]&_L)
-#define	isdigit(c)	((_ctype_+1)[(unsigned)(c)]&_N)
-#define	isxdigit(c)	((_ctype_+1)[(unsigned)(c)]&(_X|_N))
-#define	isspace(c)	((_ctype_+1)[(unsigned)(c)]&_S)
-#define ispunct(c)	((_ctype_+1)[(unsigned)(c)]&_P)
-#define isalnum(c)	((_ctype_+1)[(unsigned)(c)]&(_U|_L|_N))
-#define isprint(c)	((_ctype_+1)[(unsigned)(c)]&(_P|_U|_L|_N|_B))
-#define	isgraph(c)	((_ctype_+1)[(unsigned)(c)]&(_P|_U|_L|_N))
-#define iscntrl(c)	((_ctype_+1)[(unsigned)(c)]&_C)
+#define	isalpha(c)	((__ctype_ptr+1)[(unsigned)(c)]&(_U|_L))
+#define	isupper(c)	((__ctype_ptr+1)[(unsigned)(c)]&_U)
+#define	islower(c)	((__ctype_ptr+1)[(unsigned)(c)]&_L)
+#define	isdigit(c)	((__ctype_ptr+1)[(unsigned)(c)]&_N)
+#define	isxdigit(c)	((__ctype_ptr+1)[(unsigned)(c)]&(_X|_N))
+#define	isspace(c)	((__ctype_ptr+1)[(unsigned)(c)]&_S)
+#define ispunct(c)	((__ctype_ptr+1)[(unsigned)(c)]&_P)
+#define isalnum(c)	((__ctype_ptr+1)[(unsigned)(c)]&(_U|_L|_N))
+#define isprint(c)	((__ctype_ptr+1)[(unsigned)(c)]&(_P|_U|_L|_N|_B))
+#define	isgraph(c)	((__ctype_ptr+1)[(unsigned)(c)]&(_P|_U|_L|_N))
+#define iscntrl(c)	((__ctype_ptr+1)[(unsigned)(c)]&_C)
+
+extern	__IMPORT _CONST char	_ctype_[];  /* Deprecated.  */
+
 /* Non-gcc versions will get the library versions, and will be
    slightly slower */
 #ifdef __GNUC__
diff --git a/newlib/newlib.hin b/newlib/newlib.hin
index b1b6f051d..b08160cdb 100644
--- a/newlib/newlib.hin
+++ b/newlib/newlib.hin
@@ -141,5 +141,8 @@
  * sections.  */
 #undef  HAVE_INITFINI_ARRAY
 
+/* Define if the compiler supports aliasing an array to an address.  */
+#undef  _HAVE_ARRAY_ALIASING
+
 #endif /* !__NEWLIB_H__ */