This is an archive of the discontinued LLVM Phabricator instance.

Differential D73153

[Concepts] Update ReleaseNotes with Concepts support
AcceptedPublic

Authored by saar.raz on Jan 21 2020, 5:42 PM.

Details

Reviewers
rsmith
Summary

Update Clang 10 release notes with news of Concepts support.

Diff Detail

Event Timeline

saar.raz created this revision.Jan 21 2020, 5:42 PM
Herald added a project: Restricted Project. · View Herald TranscriptJan 21 2020, 5:42 PM
Herald added a subscriber: cfe-commits. · View Herald Transcript
Harbormaster completed remote builds in B44544: Diff 239470.Jan 21 2020, 5:44 PM
rsmith accepted this revision.Jan 23 2020, 11:48 AM
rsmith added inline comments.
clang/docs/ReleaseNotes.rst
127–128

It'd be useful to explain a bit more about the purpose of the flag. Maybe:

The -fno-concept-satisfaction-caching can be used to disable caching for satisfactions of Concepts. The C++2a draft standard does not currently permit this caching, but disabling it may incur significant compile-time costs. This flag is intended for experimentation purposes and may be removed at any time; please let us know if you encounter a situation where you need to specify this flag for correct program behavior.

This revision is now accepted and ready to land.Jan 23 2020, 11:48 AM

Revision Contents

PathSize
clang/
docs/
8 lines

Diff 239470

clang/docs/ReleaseNotes.rst

Show First 20 Lines • Show All 45 Lines • ▼ Show 20 Lines
Major New Features Major New Features
------------------ ------------------
- clang used to run the actual compilation in a subprocess ("clang -cc1"). - clang used to run the actual compilation in a subprocess ("clang -cc1").
Now compilations are done in-process by default. ``-fno-integrated-cc1`` Now compilations are done in-process by default. ``-fno-integrated-cc1``
restores the former behavior. The ``-v`` and ``-###`` flags will print restores the former behavior. The ``-v`` and ``-###`` flags will print
"(in-process)" when compilations are done in-process. "(in-process)" when compilations are done in-process.
- ... - Concepts support. Clang now supports C++2a Concepts under the -std=c++2a flag.
Improvements to Clang's diagnostics Improvements to Clang's diagnostics
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- -Wtautological-overlap-compare will warn on negative numbers and non-int - -Wtautological-overlap-compare will warn on negative numbers and non-int
types. types.
- -Wtautological-compare for self comparisons and - -Wtautological-compare for self comparisons and
-Wtautological-overlap-compare will now look through member and array -Wtautological-overlap-compare will now look through member and array
▲ Show 20 Lines • Show All 55 Lines • ▼ Show 20 Lines- The -fgnuc-version= flag now controls the value of ``__GNUC__`` and related
macros. This flag does not enable or disable any GCC extensions implemented in macros. This flag does not enable or disable any GCC extensions implemented in
Clang. Setting the version to zero causes Clang to leave ``__GNUC__`` and Clang. Setting the version to zero causes Clang to leave ``__GNUC__`` and
other GNU-namespaced macros, such as ``__GXX_WEAK__``, undefined. other GNU-namespaced macros, such as ``__GXX_WEAK__``, undefined.
- vzeroupper insertion on X86 targets can now be disabled with -mno-vzeroupper. - vzeroupper insertion on X86 targets can now be disabled with -mno-vzeroupper.
You can also force vzeroupper insertion to be used on CPUs that normally You can also force vzeroupper insertion to be used on CPUs that normally
wouldn't with -mvzeroupper. wouldn't with -mvzeroupper.
- The -fno-concept-satisfaction-caching can be used to disable caching for
satisfactions of Concepts. Using this flag might incur significant
compile-time costs.
rsmithUnsubmitted
Not Done
ReplyInline Actions

It'd be useful to explain a bit more about the purpose of the flag. Maybe:

The -fno-concept-satisfaction-caching can be used to disable caching for satisfactions of Concepts. The C++2a draft standard does not currently permit this caching, but disabling it may incur significant compile-time costs. This flag is intended for experimentation purposes and may be removed at any time; please let us know if you encounter a situation where you need to specify this flag for correct program behavior.

rsmith: It'd be useful to explain a bit more about the purpose of the flag. Maybe: > The -fno-concept…
Deprecated Compiler Flags Deprecated Compiler Flags
------------------------- -------------------------
The following options are deprecated and ignored. They will be removed in The following options are deprecated and ignored. They will be removed in
future versions of Clang. future versions of Clang.
- -mmpx used to enable the __MPX__ preprocessor define for the Intel MPX - -mmpx used to enable the __MPX__ preprocessor define for the Intel MPX
instructions. There were no MPX intrinsics. instructions. There were no MPX intrinsics.
- -mno-mpx used to disable -mmpx and is the default behavior. - -mno-mpx used to disable -mmpx and is the default behavior.
- -fconcepts-ts previously used to enable experimental concepts support. Use
-std=c++2a instead to enable Concepts support.
- ... - ...
Modified Compiler Flags Modified Compiler Flags
----------------------- -----------------------
- RISC-V now sets the architecture (riscv32/riscv64) based on the value provided - RISC-V now sets the architecture (riscv32/riscv64) based on the value provided
to the ``-march`` flag, overriding the target provided by ``-triple``. to the ``-march`` flag, overriding the target provided by ``-triple``.
▲ Show 20 Lines • Show All 326 Lines • Show Last 20 Lines