LLVM Weekly - #281, May 20th 2019
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Welcome to the two hundred and eighty-first issue of LLVM Weekly, a weekly
newsletter (published every Monday) covering developments in LLVM, Clang, and
related projects. LLVM Weekly is brought to you by [Alex
Bradbury](https://www.linkedin.com/in/alex-bradbury/). Subscribe to future
issues at <http://llvmweekly.org> and pass it on to anyone else you think may
be interested. Please send any tips or feedback to <[hidden email]>, or
@llvmweekly or @asbradbury on Twitter.
Readers may be interested in recent news about lowRISC, the not-for-profit
open source engineering organisation I co-founded. This is an exciting step
forwards on our open source hardware mission. See the coverage on the [Google
and our own [press
## News and articles from around the web
LLVM 8.0.1-rc1 [has been
An LLVM meetup will take place in Leuven, Belgium on [Wednesday June
The 6th HelloLLVM/HelloGCC social in Beijing, China will [take
place](http://lists.llvm.org/pipermail/llvm-dev/2019-May/132375.html) on May
## On the mailing lists
* Sander De Smalen has [updated his RFC thread on changes to
with a summary of feedback so far.
* Will Bundy [gave detailed
the RFC on extending optimisation reporting, based on work done in this area
at Sony Playstation.
* Jesper Antonsson
the responses to the RFC on better supporting targets where bytes are not 8
* Louis Dionne has [shared a
how to better handle experimental features in libc++, and is seeking feedback.
* Sam McCall
adding RecoveryExpr to represent invalid constructs in the Clang AST.
* Artem Dergachev has exhaustively listed the [status of 'alpha' Clang
## LLVM commits
* An initial ORC design document was committed.
* Support in ELF for "dependent libraries" was committed, intended to support
simple "autolinking" use cases. [r360984](https://reviews.llvm.org/rL360984).
* The SystemZ backend was updated to start to model the floating-point control
* Basic target feature definitions were added for Arm SVE2 as well as initial
MC layer support. [r360573](https://reviews.llvm.org/rL360573),
[r360682](https://reviews.llvm.org/rL360682), and more.
* Constrained fptrunc and fpext intrinsics were added.
* The in-tree gn build system can now build the Lanai, Sparc, and Hexagon
* Guidelines and recommendations for LLVM socials were added to the LLVM docs.
* HWASan and Kernel HWASan were ported to the new pass manager.
* In order to fix a layering problem, backends were modified to have a new
TargetInfo header. [r360709](https://reviews.llvm.org/rL360709), and more.
* A scheduling model for the Cortex-M4 was added.
* lround/llround intrinsics and SelectionDAG nodes were added.
## Clang commits
* Virtual function calls and `dynamic_cast` can now be used in constant
expression evaluation in C++20.[r360635](https://reviews.llvm.org/rL360635),
* The Clang AST can now be dumped to JSON.
* A new language mode was added for C2x, with `[[attribute]]` support enabled
by default. [r360667](https://reviews.llvm.org/rL360667).
* A new bugprone-branch-clone check was added to clang-tiy, which detects
if/else chains or swtich statements where consecutive branches contain
identical code. [r360779](https://reviews.llvm.org/rL360779).
## Other project commits
* LLD gained support for `-n` and to disable page alignment and `-N` to both
disable page alignment and mark the executable segment as writable.
* lldb-server now works with ipv6.
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