[Tarantool-patches] [PATCH luajit 0/3] Basic fixes for LuaJIT on ARM64 Macs

[Igor Munkin via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

This series consists of the three patches: the one for CMake build
machinery and two commits backported from the vanilla LuaJIT trunk[1].
If the latter commits are OK, they can be uses as an examples in
backporting procedure document[2] for the others to be adopted.

The first patch fixes the issue missed in #4862: CMake machinery fails
to locate system headers provided by SDK on MacOS platforms. The bug was
unnoticed for a while, since Tarantool testing environment doesn't use
Debug build with LUA_USE_ASSERT enabled on MacOS hosts. Anyway, even if
there was Debug build, there is a mess with the flags as a result of
#4862, so LuaJIT internal assertions would be enabled neither. The fix
contains of two parts:
1. Set the sysroot to SDK root directory if it is not set before.
2. Use ${CMAKE_C_FLAGS} in <LuaJITTestArch> auxiliary routine.

The second patch is a backport of 2e2fb8f[3]. When Apple released Macs
working on ARM64, the previous recipe in lj_arch.h for detecting Apple
platforms is not valid anymore. Fortunately, there is a system header
(i.e. TargetConditionals.h), provided by SDK with the proper defines to
be set. Since testing machinery assumes that LuaJIT is built with JIT
support being enabled unconditionally, a smoke test for it is also added
alongside with this patch.

The third patch is a backport of 521b367[4]. This patch fixes the issue
introduced by commit 2e2fb8f6b5118e1a7996b76600c6ee98bfd5f203 ('OSX/iOS:
Handle iOS simulator and ARM64 Macs.'). Within the mentioned commit
LJ_TARGET_IOS define is set via Apple system header to enable several
features (e.g. JIT and external unwinder) on ARM64 Macs, but its usage
was not adjusted source-wide. This is done for FFI machinery within this
commit. Since all LJ_TARGET_IOS usage is done with LJ_TARGET_ARM64
define being set, we can simply replace all entries with LJ_TARGET_OSX.

Branch: https://github.com/tarantool/luajit/tree/imun/gh-5983-fix-build-on-m1
Issues:
* https://github.com/tarantool/tarantool/issues/5983
* https://github.com/tarantool/tarantool/issues/5629
* https://github.com/tarantool/tarantool/issues/4862
CI looks to be OK[5] except the known problems with ASAN[6].

[1]: https://github.com/LuaJIT/LuaJIT
[2]: https://github.com/tarantool/tarantool/wiki/LuaJIT-backporting-guidelines
[3]: https://github.com/LuaJIT/LuaJIT/commit/2e2fb8f
[4]: https://github.com/LuaJIT/LuaJIT/commit/521b367
[5]: https://github.com/tarantool/tarantool/commit/fba91e1
[6]: https://github.com/tarantool/tarantool/issues/6031

Igor Munkin (1):
  build: pass sysroot to MacOS SDK

Mike Pall (2):
  OSX/iOS: Handle iOS simulator and ARM64 Macs.
  FFI/ARM64/OSX: Fix vararg call handling.

 CMakeLists.txt                                   |  9 +++++++++
 cmake/LuaJITUtils.cmake                          |  7 ++++++-
 src/lj_arch.h                                    |  8 +++++++-
 src/lj_ccall.c                                   |  8 ++++----
 src/lj_ccallback.c                               |  2 +-
 .../gh-5983-jit-library-smoke-tests.test.lua     | 11 +++++++++++
 .../lj-695-ffi-vararg-call.test.lua              | 16 ++++++++++++++++
 7 files changed, 54 insertions(+), 7 deletions(-)
 create mode 100644 test/tarantool-tests/gh-5983-jit-library-smoke-tests.test.lua
 create mode 100644 test/tarantool-tests/lj-695-ffi-vararg-call.test.lua

-- 
2.25.0