Apply a workaround to be able to build clang 8.0.0 headers with clang
3.4.1, which is still in the stable/10 branch.
It looks like clang 3.4.1 implements static_asserts by instantiating a
temporary static object, and if those are in an anonymous union, it
results in "error: anonymous union can only contain non-static data
members".
To work around this implementation limitation, move the static_asserts
in question out of the anonymous unions.
This should make building the latest stable/11 from stable/10 possible
again.
Reported by: Mike Tancsa <mike@sentex.net>
master 2e10b7a39b9, the last commit before the llvmorg-12-init tag, from
which release/11.x was branched.
Note that for now, I rolled back all our local changes to make merging
easier, and I will reapply the still-relevant ones after updating to
11.0.0-rc1.
[PowerPC] Add clang -msvr4-struct-return for 32-bit ELF
Summary:
Change the default ABI to be compatible with GCC. For 32-bit ELF
targets other than Linux, Clang now returns small structs in
registers r3/r4. This affects FreeBSD, NetBSD, OpenBSD. There is no
change for 32-bit Linux, where Clang continues to return all structs
in memory.
Add clang options -maix-struct-return (to return structs in memory)
and -msvr4-struct-return (to return structs in registers) to be
compatible with gcc. These options are only for PPC32; reject them on
PPC64 and other targets. The options are like -fpcc-struct-return and
-freg-struct-return for X86_32, and use similar code.
To actually return a struct in registers, coerce it to an integer of
the same size. LLVM may optimize the code to remove unnecessary
accesses to memory, and will return i32 in r3 or i64 in r3:r4.
Fixes PR#40736
Patch by George Koehler!
Reviewed By: jhibbits, nemanjai
Differential Revision: https://reviews.llvm.org/D73290
Requested by: jhibbits
MFC after: 3 days
This uses the new layout of the upstream repository, which was recently
migrated to GitHub, and converted into a "monorepo". That is, most of
the earlier separate sub-projects with their own branches and tags were
consolidated into one top-level directory, and are now branched and
tagged together.
Updating the vendor area to match this layout is next.
