[Bug c++/53932] [10/11/12/13 Regression] C++ reference variable to member of anonymous union in global is error
cvs-commit at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Thu Jan 19 22:28:19 GMT 2023
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53932
--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:
https://gcc.gnu.org/g:9b9a989adc042b304572fd6d4ade46b47be6ccb8
commit r13-5265-g9b9a989adc042b304572fd6d4ade46b47be6ccb8
Author: Jakub Jelinek <jakub@redhat.com>
Date: Thu Jan 19 23:27:34 2023 +0100
c++: Fix up handling of references to anon union members in initializers
[PR53932]
For anonymous union members we create artificial VAR_DECLs which
have DECL_VALUE_EXPR for the actual COMPONENT_REF. That works
just fine inside of functions (including global dynamic constructors),
because during gimplification such VAR_DECLs are gimplified as
their DECL_VALUE_EXPR. This is also done during regimplification.
But references to these artificial vars in DECL_INITIAL expressions
aren't ever replaced by the DECL_VALUE_EXPRs, so we end up either
with link failures like on the testcase below, or worse ICEs with
LTO.
The following patch fixes those during cp_fully_fold_init where we
already walk all the trees (!data->genericize means that
function rather than cp_fold_function).
2023-01-19 Jakub Jelinek <jakub@redhat.com>
PR c++/53932
* cp-gimplify.cc (cp_fold_r): During cp_fully_fold_init replace
DECL_ANON_UNION_VAR_P VAR_DECLs with their corresponding
DECL_VALUE_EXPR.
* g++.dg/init/pr53932.C: New test.
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