re PR middle-end/18785 (isdigit builtin function fails with EBCDIC character sets)

	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.

From-SVN: r95304

1 files changed, 21 insertions, 0 deletions

diff --git a/gcc/c-common.c b/gcc/c-common.c
index b414915..a4dfdd8 100644
--- a/gcc/c-common.c
+++ b/gcc/c-common.c
@@ -5620,6 +5620,27 @@ c_warn_unused_result (tree *top_p)
     }
 }
 
+/* Convert a character from the host to the target execution character
+   set.  cpplib handles this, mostly.  */
+
+HOST_WIDE_INT
+c_common_to_target_charset (HOST_WIDE_INT c)
+{
+  /* Character constants in GCC proper are sign-extended under -fsigned-char,
+     zero-extended under -fno-signed-char.  cpplib insists that characters
+     and character constants are always unsigned.  Hence we must convert
+     back and forth.  */
+  cppchar_t uc = ((cppchar_t)c) & ((((cppchar_t)1) << CHAR_BIT)-1);
+
+  uc = cpp_host_to_exec_charset (parse_in, uc);
+
+  if (flag_signed_char)
+    return ((HOST_WIDE_INT)uc) << (HOST_BITS_PER_WIDE_INT - CHAR_TYPE_SIZE)
+			       >> (HOST_BITS_PER_WIDE_INT - CHAR_TYPE_SIZE);
+  else
+    return uc;
+}
+
 /* Build the result of __builtin_offsetof.  EXPR is a nested sequence of
    component references, with an INDIRECT_REF at the bottom; much like
    the traditional rendering of offsetof as a macro.  Returns the folded