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This is GCC Bugzilla Version 2.20+
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compiling this hangs: struct A { // empty }; struct B : A { int b; }; union U { A a; B b; };
Confirmed.
Working on a fix.
Subject: Bug 15507 CVSROOT: /cvs/gcc Module name: gcc Branch: gcc-3_4-branch Changes by: mmitchel@gcc.gnu.org 2004-05-22 19:16:53 Modified files: gcc/cp : ChangeLog class.c typeck.c gcc/testsuite : ChangeLog Added files: gcc/testsuite/g++.dg/inherit: union1.C gcc/testsuite/g++.dg/template: addr1.C array5.C array6.C Log message: PR c++/15507 * g++.dg/inherit/union1.C: New test. PR c++/15542 * g++.dg/template/addr1.C: New test. PR c++/15427 * g++.dg/template/array5.C: New test. PR c++/15287 * g++.dg/template/array6.C: New test. PR c++/15507 * g++.dg/inherit/union1.C: New test. PR c++/15542 * g++.dg/template/addr1.C: New test. PR c++/15427 * g++.dg/template/array5.C: New test. PR c++/15287 * g++.dg/template/array6.C: New test. Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.3892.2.100&r2=1.3892.2.101 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/class.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.595.4.7&r2=1.595.4.8 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/typeck.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.519.2.14&r2=1.519.2.15 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.3389.2.177&r2=1.3389.2.178 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/inherit/union1.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/addr1.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/array5.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/array6.C.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=NONE&r2=1.1.2.1
Subject: Bug 15507 CVSROOT: /cvs/gcc Module name: gcc Changes by: mmitchel@gcc.gnu.org 2004-05-22 19:28:31 Modified files: gcc/cp : ChangeLog class.c typeck.c gcc/testsuite : ChangeLog Added files: gcc/testsuite/g++.dg/inherit: union1.C gcc/testsuite/g++.dg/template: addr1.C array5.C array6.C Log message: PR c++/15507 * class.c (layout_nonempty_base_or_field): Do not try to avoid layout conflicts for unions. PR c++/15542 * typeck.c (build_x_unary_op): Instantiate template class specializations before looking for "operator &". PR c++/15427 * typeck.c (complete_type): Layout non-dependent array types, even in templates. PR c++/15287 * typeck.c (build_unary_op): Do not optimize "&x[y]" when in a template. PR c++/15507 * g++.dg/inherit/union1.C: New test. PR c++/15542 * g++.dg/template/addr1.C: New test. PR c++/15427 * g++.dg/template/array5.C: New test. PR c++/15287 * g++.dg/template/array6.C: New test. Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/ChangeLog.diff?cvsroot=gcc&r1=1.4050&r2=1.4051 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/class.c.diff?cvsroot=gcc&r1=1.612&r2=1.613 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/typeck.c.diff?cvsroot=gcc&r1=1.542&r2=1.543 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.3769&r2=1.3770 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/inherit/union1.C.diff?cvsroot=gcc&r1=1.1&r2=1.2 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/template/addr1.C.diff?cvsroot=gcc&r1=1.1&r2=1.2 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/template/array5.C.diff?cvsroot=gcc&r1=1.1&r2=1.2 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/template/array6.C.diff?cvsroot=gcc&r1=1.1&r2=1.2
Fixed in GCC 3.4.1.