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This is GCC Bugzilla Version 2.20+
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----------------------------------- namespace A { namespace B {} } namespace A { namespace Alias = ::A::B; } namespace A { namespace Alias = ::A::B; } ----------------------------------- namespace.cc:10: error: declaration of `namespace Alias = A::B;' namespace.cc:6: error: conflicts with previous declaration `namespace Alias = A: :B;' This is obviously bogus, and breaks a library currently under review for Boost. The workaround is harder than one might think because the conflicting aliases come from different headers.
Confirmed.
Working on a fix.
Subject: Bug 14821 CVSROOT: /cvs/gcc Module name: gcc Branch: gcc-3_4-branch Changes by: mmitchel@gcc.gnu.org 2004-05-23 17:52:22 Modified files: gcc/testsuite : ChangeLog gcc/cp : ChangeLog name-lookup.c parser.c Added files: gcc/testsuite/g++.dg/other: ns1.C gcc/testsuite/g++.dg/template: invalid1.C Log message: PR c++/14821 * name-lookup.c (supplement_binding): Allow redefinitions of namespace aliases. PR c++/14883 * parser.c (cp_parser_template_argument): Robustify. PR c++/14821 * g++.dg/other/ns1.C: New test. PR c++/14883 * g++.dg/template/invalid1.C: New test. Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.3389.2.179&r2=1.3389.2.180 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.3892.2.102&r2=1.3892.2.103 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/name-lookup.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.34.2.11&r2=1.34.2.12 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/parser.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.157.2.26&r2=1.157.2.27 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/other/ns1.C.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=NONE&r2=1.1.2.1 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/template/invalid1.C.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=NONE&r2=1.1.2.1
Subject: Bug 14821 CVSROOT: /cvs/gcc Module name: gcc Changes by: mmitchel@gcc.gnu.org 2004-05-23 17:56:28 Modified files: gcc/cp : ChangeLog name-lookup.c parser.c gcc/testsuite : ChangeLog Added files: gcc/testsuite/g++.dg/other: ns1.C gcc/testsuite/g++.dg/template: invalid1.C Log message: PR c++/14821 * name-lookup.c (supplement_binding): Allow redefinitions of namespace aliases. PR c++/14883 * parser.c (cp_parser_template_argument): Robustify. PR c++/14821 * g++.dg/other/ns1.C: New test. PR c++/14883 * g++.dg/template/invalid1.C: New test. Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/ChangeLog.diff?cvsroot=gcc&r1=1.4053&r2=1.4054 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/name-lookup.c.diff?cvsroot=gcc&r1=1.53&r2=1.54 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/parser.c.diff?cvsroot=gcc&r1=1.193&r2=1.194 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.3773&r2=1.3774 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/other/ns1.C.diff?cvsroot=gcc&r1=1.1&r2=1.2 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/template/invalid1.C.diff?cvsroot=gcc&r1=1.1&r2=1.2
Fixed in GCC 3.4.1.