https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53932
--- Comment #15 from CVS Commits ---
The releases/gcc-11 branch has been updated by Jakub Jelinek
:
https://gcc.gnu.org/g:bd34d694f4c060c92aee0e09edf4c7e1d83807e5
commit r11-10700-gbd34d694f4c060c92aee0e09edf4c7e1d83807e5
Author: Jakub Jelinek
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
PR c++/53932
* cp-gimplify.c (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.
(cherry picked from commit 9b9a989adc042b304572fd6d4ade46b47be6ccb8)
