[gcc/devel/rust/master] Merge #1188

[gcc/devel/rust/master] Merge #1188

[Thomas Schwinge]

https://gcc.gnu.org/g:f38bf60c3ac7f039db5ff5c7c0587325097892c8

commit f38bf60c3ac7f039db5ff5c7c0587325097892c8
Merge: f8a137bd939 fd51331270e
Author: bors[bot] <26634292+bors[bot]@users.noreply.github.com>
Date:   Fri Apr 29 15:14:48 2022 +0000

    Merge #1188
    
    1188: Support align and packed repr layout on structs r=dafaust a=dafaust
    
    This is a start at handling the various layout options supported by Rust, beginning with `#[repr(align(N))]` and `#[repr(packed(N))]`, on structs and tuple structs.
    
    There are several other layout options which remain to be supported such as `#[repr(C)]`, `#[repr(transparent)]`, combinations e.g. `#[repr(C, packed(2))]`, as well as layouts on union and enum types.
    
    Fixes: #915
    
    Co-authored-by: David Faust <david.faust@oracle.com>

Diff:

 gcc/rust/backend/rust-compile-type.cc             | 20 +++++++
 gcc/rust/typecheck/rust-hir-type-check-base.cc    | 67 +++++++++++++++++++++++
 gcc/rust/typecheck/rust-hir-type-check-base.h     |  3 +
 gcc/rust/typecheck/rust-hir-type-check-stmt.h     | 16 +++++-
 gcc/rust/typecheck/rust-hir-type-check-toplevel.h | 16 +++++-
 gcc/rust/typecheck/rust-tyty.cc                   |  3 +-
 gcc/rust/typecheck/rust-tyty.h                    | 28 ++++++++++
 gcc/rust/util/rust-attributes.cc                  |  1 +
 gcc/testsuite/rust/compile/struct_align1.rs       | 19 +++++++
 gcc/testsuite/rust/compile/struct_align2.rs       | 18 ++++++
 gcc/testsuite/rust/compile/struct_pack1.rs        | 19 +++++++
 gcc/testsuite/rust/compile/struct_pack2.rs        | 18 ++++++
 12 files changed, 223 insertions(+), 5 deletions(-)