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Bug 6949 - [3.3/3.4 regression] ICE in tsubst_decl, at cp/pt.c:5733
Summary: [3.3/3.4 regression] ICE in tsubst_decl, at cp/pt.c:5733
Alias: None
Product: gcc
Classification: Unclassified
Component: c++ (show other bugs)
Version: 3.4.0
: P3 normal
Target Milestone: 3.3.1
Assignee: Not yet assigned to anyone
Keywords: ice-on-valid-code
Depends on:
Reported: 2002-06-06 13:36 UTC by rubin
Modified: 2004-01-17 04:22 UTC (History)
3 users (show)

See Also:
Known to work:
Known to fail:
Last reconfirmed: 2003-06-22 21:16:55

Attachments (150 bytes, application/octet-stream)
2003-05-21 15:16 UTC, rubin

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Description rubin 2002-06-06 13:36:01 UTC
This ICE is caused by a class nested inside a local class of a templated member function.  The code snippet below is illustrative of the ICE in my application.  I found that small changes in the snippet cause the ICE to disappear, or to pop up in another place.  For example, just replacing

                      void funct();
                      void funct(){}

causes the ICE to disappear!

//========= Compiler output ================

$ gcc -v -save-temps GccBug2.cpp
Reading specs from /usr/local/lib/gcc-lib/i686-pc-cygwin/3.1/specs
Configured with: ../gcc-3.1/configure --enable-threads=win32
Thread model: win32
gcc version 3.1
// ... junk elided here ...
GNU CPP version 3.1 (cpplib) (80386, BSD syntax)
GNU C++ version 3.1 (i686-pc-cygwin)
        compiled by GNU C version 3.1.
GccBug2.cpp: In instantiation of `Struct::templatedMemberFunction(const T&) 
             [with T = int]::LocalClass::NestedClass':
GccBug2.cpp:6:   instantiated from `Struct::templatedMemberFunction(const T&) 
                 [with T = int]::LocalClass'
GccBug2.cpp:16:   instantiated from `void Struct::templatedMemberFunction
                  (const T&) [with T = int]'
GccBug2.cpp:23:   instantiated from here
GccBug2.cpp:7: Internal compiler error in tsubst_decl, at cp/pt.c:5733
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:> for instructions.

//========= Source File GccBug2.cpp Begins Here ===========
struct Struct {
  template<class T> void templatedMemberFunction(const T&) {

    class LocalClass {

        struct NestedClass {
          void funct();

        NestedClass nestedClassInstance_;

        void memberFunction() {nestedClassInstance_.funct();}

    LocalClass localClass;

void globalFunction() {
  Struct classInstance;
//========= Source File GccBug2.cpp Ends Here =============


Cygwin on Windows XP Professional

Invoke the compiler on GccBug2.cpp.
Comment 1 Kriang Lerdsuwanakij 2002-06-07 07:03:48 UTC
State-Changed-From-To: open->analyzed
State-Changed-Why: Confirmed.
Comment 2 Christian Ehrhardt 2003-05-12 18:58:18 UTC
From: "Christian Ehrhardt" <>
Subject: Re: c++/6949: [2003-01-22] ICE in tsubst_decl, at cp/pt.c:5733
Date: Mon, 12 May 2003 18:58:18 +0200
 A further cleaned up testcase is below. The problem is that tsubst_decl
 expects non NULL DECL_TEMPLATE_INFO on the prototype declaration of the
 member function g in this assertion around line 6000 in cp/pt.c:
 |  /* Nobody should be tsubst'ing into non-template functions.  */
 |  my_friendly_assert (DECL_TEMPLATE_INFO (t) != NULL_TREE, 0);
 template<class T>
 void f(const T&)
         struct B {
                 void g (T);
         B b;
 void g()
    regards  Christian
Comment 3 Andrew Pinski 2003-06-14 22:07:46 UTC
This is a regression from 2.91.66, old but still a regression though.
Comment 5 CVS Commits 2003-07-02 04:11:36 UTC
Subject: Bug 6949

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	2003-07-02 04:11:30

Modified files:
	gcc/cp         : ChangeLog decl2.c 
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/g++.dg/template: local3.C 

Log message:
	PR c++/6949
	* decl2.c (grokfield): Create TEMPLATE_DECLs for methods in local
	PR c++/6949
	* g++.dg/template/local3.C: New test.


Comment 6 Mark Mitchell 2003-07-02 04:49:15 UTC
Fixed in GCC 3.3.1, and GCC 3.4.