re PR preprocessor/63831 (r217292 causes segfaults with -MM)

	PR preprocessor/63831
	* c-cppbuiltin.c (c_cpp_builtins): Don't define __has_attribute
	and __has_cpp_attribute here.
	* c-ppoutput.c (init_pp_output): Set cb->has_attribute to
	c_common_has_attribute.
	* c-common.h (c_common_has_attribute): New prototype.
	* c-lex.c (init_c_lex): Set cb->has_attribute to
	c_common_has_attribute instead of cb_has_attribute.
	(get_token_no_padding): New function.
	(cb_has_attribute): Renamed to ...
	(c_common_has_attribute): ... this.  No longer static.  Use
	get_token_no_padding, require ()s, don't build TREE_LIST
	unnecessarily, fix up formatting, adjust diagnostics, call
	init_attributes.

	* directives.c (lex_macro_node): Remove __has_attribute__ handling.
	* internal.h (struct spec_node): Remove n__has_attribute__ field.
	(struct lexer_state): Remove in__has_attribute__ field.
	* macro.c (_cpp_builtin_macro_text): Handle BT_HAS_ATTRIBUTE.
	* identifiers.c (_cpp_init_hashtable): Remove __has_attribute__
	handling.
	* init.c (builtin_array): Add __has_attribute and __has_cpp_attribute.
	(cpp_init_special_builtins): Don't initialize __has_attribute
	or __has_cpp_attribute if CLK_ASM or pfile->cb.has_attribute is NULL.
	* traditional.c (enum ls): Remove ls_has_attribute,
	ls_has_attribute_close.
	(_cpp_scan_out_logical_line): Remove __has_attribute__ handling.
	* include/cpplib.h (enum cpp_builtin_type): Add BT_HAS_ATTRIBUTE.
	* pch.c (cpp_read_state): Remove __has_attribute__ handling.
	* expr.c (eval_token): Likewise.
	(parse_has_attribute): Removed.

	* c-c++-common/cpp/pr63831-1.c: New test.
	* c-c++-common/cpp/pr63831-2.c: New test.

From-SVN: r218948

1 files changed, 6 insertions, 0 deletions

diff --git a/libcpp/init.c b/libcpp/init.c
index 2add6ea..cf0145b 100644
--- a/libcpp/init.c
+++ b/libcpp/init.c
@@ -380,6 +380,8 @@ static const struct builtin_macro builtin_array[] =
   B("__LINE__",		 BT_SPECLINE,      true),
   B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL, true),
   B("__COUNTER__",	 BT_COUNTER,       true),
+  B("__has_attribute",	 BT_HAS_ATTRIBUTE, true),
+  B("__has_cpp_attribute", BT_HAS_ATTRIBUTE, true),
   /* Keep builtins not used for -traditional-cpp at the end, and
      update init_builtins() if any more are added.  */
   B("_Pragma",		 BT_PRAGMA,        true),
@@ -460,6 +462,10 @@ cpp_init_special_builtins (cpp_reader *pfile)
 
   for (b = builtin_array; b < builtin_array + n; b++)
     {
+      if (b->value == BT_HAS_ATTRIBUTE
+	  && (CPP_OPTION (pfile, lang) == CLK_ASM
+	      || pfile->cb.has_attribute == NULL))
+	continue;
       cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
       hp->type = NT_MACRO;
       hp->flags |= NODE_BUILTIN;