c++/9384: [3.4 Regression] ICE in validate_nonmember_using_decl, at cp/decl2.c:4152

[Volker Reichelt]

The following reply was made to PR c++/9384; it has been noted by GNATS.

From: Volker Reichelt <reichelt@igpm.rwth-aachen.de>
To: gcc-gnats@gcc.gnu.org, rguenth@tat.physik.uni-tuebingen.de,
        gcc-bugs@gcc.gnu.org
Cc:  
Subject: Re: c++/9384: [3.4 Regression] ICE in validate_nonmember_using_decl, at cp/decl2.c:4152
Date: Wed, 22 Jan 2003 00:25:04 +0100

 The ICEs in the 3.3 branch and mainline are completely unrelated
 as the follwoing reduced testcases show.
 
 The bug on mainline can be triggered with the following line of code:
 
 ----------------------snip here----------------------
 namespace A { using ::B; }
 ----------------------snip here----------------------
 
 Compiling this with mainline I get
 
 PR9384A.cc:1: internal compiler error: in validate_nonmember_using_decl, at 
    cp/decl2.c:4152
 
 This is a regression on mainline.
 
 
 The bug on the 3.3 branch can be triggered with the following testcase:
 
 ----------------------snip here--------------------------------------
 template <typename T> struct A
 {
     A(int);
 };
 
 template <typename T> A<T>::A(int i __attribute__ ((__unused__)) ) {}
 ----------------------snip here--------------------------------------
 
 The code causes a compiler crash since gcc 3.0 (which is changed to a
 "confused by earlier errors, ..." message in release versions):
 
 PR9384B.cc:6: error: parse error before `__attribute__'
 PR9384B.cc:6: internal compiler error: in poplevel, at cp/decl.c:1283
 
 (gcc 2.95.3 rejects the code and mainline accepts it).
 
 I don't know where you have to place the attribute, but placing it in
 front of "int i" makes the code compile, writing just "int" without "i"
 and attribute "__unused__" should have the same effect, right?
 
 Given that this is just an error recovery problem and that there's an
 easy workaround, I don't think that this will be fixed on 3.3 branch.
 
 Regards,
 Volker
 
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9384