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Re: C++ PATCH for c++/65646 (ICE after error specializing missing static data member)

On 04/01/2015 12:36 PM, Jason Merrill wrote:
This testcase started crashing because the added call to
check_explicit_specialization does a SET_DECL_TEMPLATE_SPECIALIZATION
which wasn't happening previously, and then determine_visibility assumes
that if DECL_USE_TEMPLATE is set, so is DECL_TEMPLATE_INFO.  Fixed for
GCC 5 by avoiding the call if we aren't dealing with a member template.

And fixed for GCC 6 by adjusting check_explicit_specialization.

commit a7205fbf919d0f460c278843159bb068745406dc
Author: Jason Merrill <>
Date:   Wed Apr 1 12:48:40 2015 -0400

    	PR c++/65646
    	* pt.c (check_explicit_specialization): Don't
    	SET_DECL_TEMPLATE_SPECIALIZATION for a variable with no template
    	* decl.c (grokvardecl): Revert earlier fix.

diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
index 29d6e73..6ec1579 100644
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -8210,9 +8210,7 @@ grokvardecl (tree type,
     DECL_INTERFACE_KNOWN (decl) = 1;
   // Handle explicit specializations and instantiations of variable templates.
-  if (orig_declarator
-      /* For GCC 5 fix 65646 this way.  */
-      && current_tmpl_spec_kind (template_count) != tsk_none)
+  if (orig_declarator)
     decl = check_explicit_specialization (orig_declarator, decl,
 					  template_count, 0);
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index d45fe7c..ea0d3bc 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -2424,7 +2424,7 @@ check_explicit_specialization (tree declarator,
   switch (tsk)
     case tsk_none:
-      if (processing_specialization)
+      if (processing_specialization && TREE_CODE (decl) != VAR_DECL)
 	  specialization = 1;

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