Hi!
If lookup_name_fuzzy finds an exact match with a macro, it later in the dtor
uses node->value.macro->line in libcpp. The problem is that for builtin
macros node->value.macro contains garbage, we use node->value.builtin union
member in those cases instead. It doesn't make any sense to look up
location of a builtin macro definition anyway, those are very special
entities. So, this patch just ignores those, because we can't do anything
useful with them.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2018-01-02 Jakub Jelinek <ja...@redhat.com>
PR preprocessor/83602
* name-lookup.c (lookup_name_fuzzy): Don't use macro_use_before_def
for builtin macros.
* g++.dg/cpp/pr83602.C: New test.
--- gcc/cp/name-lookup.c.jj 2017-12-19 18:09:05.828304241 +0100
+++ gcc/cp/name-lookup.c 2018-01-02 14:00:36.616761370 +0100
@@ -5757,7 +5757,7 @@ lookup_name_fuzzy (tree name, enum looku
/* If we have an exact match for a macro name, then the
macro has been used before it was defined. */
cpp_hashnode *macro = bmm.blithely_get_best_candidate ();
- if (macro)
+ if (macro && (macro->flags & NODE_BUILTIN) == 0)
return name_hint (NULL,
new macro_use_before_def (loc, macro));
}
--- gcc/testsuite/g++.dg/cpp/pr83602.C.jj 2018-01-02 14:04:48.062827484
+0100
+++ gcc/testsuite/g++.dg/cpp/pr83602.C 2018-01-02 14:03:56.517813869 +0100
@@ -0,0 +1,4 @@
+// PR preprocessor/83602
+// { dg-do compile }
+
+_Pragma // { dg-error "_Pragma" }
Jakub
