https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100246
Bug ID: 100246
Summary: [11/12 Regression] GCC will not bootstrap with clang
3.4/3.5 [xcode 5/6, Darwin 12/13]
Product: gcc
Version: 10.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: iains at gcc dot gnu.org
Target Milestone: ---
using CC=clang and CXX="clang++ -stdlib=libc++" which is needed to get C++11
support.
In file included from /src-local/gcc-git-11/gcc/config/i386/i386-options.c:94:
/src-local/gcc-git-11/gcc/config/i386/x86-tune-costs.h:363:13: error: call to
implicitly-deleted default constructor of 'const struct stringop_strategy'
{libcall, {{-1, rep_prefix_4_byte, false}}},
^
/src-local/gcc-git-11/gcc/config/i386/i386.h:254:15: note: default constructor
of 'stringop_strategy' is implicitly deleted because field 'max' of
const-qualified type 'const int' would not be initialized
const int max;
====
when building in c++89 mode, (GCC10.x and earlier) this worked fine. It does
look like a clang bug (but the rules are quite complex around this topic). It
would seem it's trying to find a constructor for the empty elements in the
lists (and that is implicitly deleted).
====
A workaround is to ensure that all the elements have a complete initialisers
with dummy entries for those that are not needed. Patch pending.
