PR 18785

libcpp:
	* charset.c (LAST_POSSIBLY_BASIC_SOURCE_CHAR): New helper macro.
	(cpp_host_to_exec_charset): New function.
	* include/cpplib.h: Declare cpp_host_to_exec_charset.

gcc:
	* langhooks.h (struct lang_hooks): Add to_target_charset.
	* langhooks.c (lhd_to_target_charset): New function.
	* langhooks-def.h: Declare lhd_to_target_charset.
	(LANG_HOOKS_TO_TARGET_CHARSET): New macro.
	(LANG_HOOKS_INITIALIZER): Update.
	* c-common.c (c_common_to_target_charset): New function.
	* c-common.h: Declare it.
	* c-objc-common.h (LANG_HOOKS_TO_TARGET_CHARSET): Set to
	c_common_to_target_charset.

	* defaults.c (TARGET_BELL, TARGET_BS, TARGET_CR, TARGET_DIGIT0)
	(TARGET_ESC, TARGET_FF, TARGET_NEWLINE, TARGET_TAB, TARGET_VT):
	Delete definitions.
	* system.h: Poison them.
	* doc/tm.texi: Don't discuss them.
	* builtins.c (fold_builtin_isdigit): Use lang_hooks.to_target_charset.
	* c-pretty-print.c (pp_c_integer_constant): Don't use pp_c_char.
	(pp_c_char): Do not attempt to generate letter escapes for
	newline, tab, etc.
	* config/arm/arm.c (output_ascii_pseudo_op): Likewise.
	* config/mips/mips.c (mips_output_ascii): Likewise.
gcc/cp:
	* cp-objcp-common.h (LANG_HOOKS_TO_TARGET_CHARSET): Set to
	c_common_to_target_charset.  Delete bogus comment.
gcc/testsuite:
	* gcc.dg/charset/builtin1.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@95304 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 11 insertions, 4 deletions

diff --git a/gcc/builtins.c b/gcc/builtins.c
index c214ef7ae20..f0dd878d36b 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -7623,11 +7623,18 @@ fold_builtin_isdigit (tree arglist)
   else
     {
       /* Transform isdigit(c) -> (unsigned)(c) - '0' <= 9.  */
-      /* According to the C standard, isdigit is unaffected by locale.  */
-      tree arg = TREE_VALUE (arglist);
-      arg = fold_convert (unsigned_type_node, arg);
+      /* According to the C standard, isdigit is unaffected by locale.
+	 However, it definitely is affected by the target character set.  */
+      tree arg;
+      unsigned HOST_WIDE_INT target_digit0
+	= lang_hooks.to_target_charset ('0');
+
+      if (target_digit0 == 0)
+	return NULL_TREE;
+
+      arg = fold_convert (unsigned_type_node, TREE_VALUE (arglist));
       arg = build2 (MINUS_EXPR, unsigned_type_node, arg,
-		    build_int_cst (unsigned_type_node, TARGET_DIGIT0));
+		    build_int_cst (unsigned_type_node, target_digit0));
       arg = build2 (LE_EXPR, integer_type_node, arg,
 		    build_int_cst (unsigned_type_node, 9));
       arg = fold (arg);