Tested on NetBSD-current and 9.1/amd64.
Also update packages tightly coupled to llvm, if new versions are
available.
Mark creduce, include-what-you-use, and zig broken (waiting for a
new release).
Changes:
Non-comprehensive list of changes in this release
Windows Control-flow Enforcement Technology: the -ehcontguard
option now emits valid unwind entrypoints which are validated
when the context is being set during exception handling.
Flang is now included in the binary packages released by LLVM.
The debuginfo-test project has been renamed cross-project-tests
and is now intended for testing components from multiple
projects, not just debug information. The new “cross-project-tests”
name replaces “debuginfo-test” in LLVM_ENABLE_PROJECTS, and a
new check-cross-project-tests target has been added for running
all tests in the project. The pre-existing check-debuginfo-
test target remains for running just the debug information
tests. (D95339 and D96513)
Changes to the LLVM IR
The inalloca attribute now has a mandatory type field, similar
to byval and sret.
The opaque pointer type ptr has been introduced. It is still
in the process of being worked on and should not be used yet.
Using the legacy pass manager for the optimization pipeline is
deprecated and will be removed after LLVM 14. In the meantime,
only minimal effort will be made to maintain the legacy pass
manager for the optimization pipeline.
Changes to building LLVM
The build system now supports building multiple distributions,
so that you can e.g. have one distribution containing just
tools and another for libraries (to enable development). See
Multi-distribution configurations for details.
Changes to the AArch64 Backend
Introduced assembly support for Armv9-A’s Realm Management
Extension (RME) and Scalable Matrix Extension (SME).
Produce proper cross-section relative relocations on COFF
Fixed the calling convention on Windows for variadic functions
involving floats in the fixed arguments
Changes to the ARM Backend
Produce proper cross-section relative relocations on COFF
Changes to the Hexagon Target
The Hexagon target now supports V68/HVX ISA.
Changes to the C API
The C API functions LLVMGetAlignment and LLVMSetAlignment now
allow changing alignment on atomicrmw and cmpxchg instructions
A new entry LLVMDIArgListMetadataKind was added to the
LLVMMetadataKind enum, representing DIArgLists (D88175)
Type attributes have been added to LLVM-C, introducing
LLVMCreateTypeAttribute, LLVMGetTypeAttributeValue and
LLVMIsTypeAttribute. (D977763’)
The LTO_API_VERSION was bumped to 28, introducing a new function
lto_set_debug_options for parsing LTO debug options (D92611)
LLVMJITTargetSymbolFlags was renamed to LLVMJITSymbolTargetFlags
(rG8d718a0bff73af066675a6258c01307937c33cf9)
The C API received support for creating custom ORCv2
MaterializationUnits and APIs to retrieve an LLJIT instance’s
linking layers. An ABI breaking change for LLVMOrcAbsoluteSymbols
was introduced to make it consistent with
LLVMOrcCreateCustomMaterializationUnit.
(rGc8fc5e3ba942057d6c4cdcd1faeae69a28e7b671)
The C API received support for adding ORCv2 object buffers
directly to an object layer.
(rG7b73cd684a8d5fb44d34064200f10e2723085c33)
A breaking change to LLVMGetInlineAsm was introduced, adding
a ninth argument LLVMBool CanThrow (D95745)
The C API received support for calling into the new pass manager.
(D102136)
The C API function LLVMIntrinsicCopyOverloadedName has been
deprecated. Please migrate to LLVMIntrinsicCopyOverloadedName2
which takes an extra module argument and which also handles
unnamed types. (D99173)
The C API received support for dumping objects from ORCv2
(rGcec8e69f01c3374cb38c6683058381b96fab8f89)
A breaking change to LLVMOrcObjectTransformLayerTransformFunction
was introduced, changing the order of the function pointer’s
arguments. (rG8962c68ad007a525f9daa987c99eda57e0d0069a)
The C API received support for accessing utilities from the
LLJIT IRTransformLayer and ThreadSafeModule classes. (D103855)
The C API received support for creating lazy-export
MaterializationUnits (D104672)
The C API function LLVMPassBuilderOptionsSetCoroutines was
removed because couroutine passes have been enabled by default.
(D105877)
comdat noduplicates was renamed to comdat nodeduplicate and as
a result, LLVMNoDuplicatesComdatSelectionKind was renamed to
LLVMNoDeduplicateComdatSelectionKind. (D106319)
Changes to the FastISel infrastructure
FastISel no longer tracks killed registers, and instead leaves
this to the register allocator. This means that hasTrivialKill()
is removed, as well as the OpNIsKill parameters to the fastEmit_*()
family of functions.
Changes to the LLVM tools
The options --build-id-link-{dir,input,output} have been deleted.
(D96310)
Support for in-order processors has been added to llvm-mca.
(D94928)
llvm-objdump supports -M {att,intel} now. --x86-asm-syntax is
a deprecated internal option which will be removed in LLVM
14.0.0. (D101695)
The llvm-readobj short aliases -s (previously --sections) and
-t (previously --syms) have been changed to --syms and
--section-details respectively, to match llvm-readelf. (D105055)
The llvm-nm short aliases -M (--print-armap), -U (--defined-only),
and -W (--no-weak) are now deprecated. Use the long form versions
instead. The alias --just-symbol-name is now deprecated in
favor of --format=just-symbols and -j. (D105330)
In lli the default JIT engine switched from MCJIT (-jit-kind=mcjit)
to ORC (-jit-kind=orc). (D98931)
llvm-rc got support for invoking Clang to preprocess its input.
(D100755)
llvm-rc got a GNU windres compatible frontend, llvm-windres.
(D100756)
llvm-ml has improved compatibility with MS ml.exe, managing to
assemble more asm files.
Changes to LLDB
LLDB executable is now included in pre-built LLVM binaries.
LLDB now includes full featured support for AArch64 SVE register
access.
LLDB now supports AArch64 Pointer Authentication, allowing
stack unwind with signed return address.
LLDB now supports debugging programs on AArch64 Linux that use
memory tagging (MTE).
Added memory tag read and memory tag write commands.
The memory region command will note when a region has memory
tagging enabled.
Synchronous and asynchronous tag faults are recognised.
Synchronous tag faults have memory tag annotations in addition
to the usual fault address.
What’s New in Libc++ 12.0.0?
New Features
Random device support has been made optional. It’s enabled by default and can be disabled by building libc++ with -DLIBCXX_ENABLE_RANDOM_DEVICE=OFF. Disabling random device support can be useful when building the library for platforms that don’t have a source of randomness, such as some embedded platforms. When this is not supported, most of <random> will still be available, but std::random_device will not.
Localization support has been made optional. It’s enabled by default and can be disabled by building libc++ with -DLIBCXX_ENABLE_LOCALIZATION=OFF. Disabling localization can be useful when porting to platforms that don’t support the C locale API (e.g. embedded). When localization is not supported, several parts of the library will be disabled: <iostream>, <regex>, <locale> will be completely unusable, and other parts may be only partly available.
If libc++ is compiled with a C++20 capable compiler it will be compiled in C++20 mode. Else libc++ will be compiled in C++17 mode.
Several unqualified lookups in libc++ have been changed to qualified lookups. This makes libc++ more ADL-proof.
The libc++ implementation status pages have been overhauled. Like other parts documentation they now use restructured text instead of html. Starting with libc++12 the status pages are part of libc++’s documentation.
More C++20 features have been implemented. libc++ C++20 Status has the full overview of libc++’s C++20 implementation status.
Work has started to implement new C++2b features. libc++ C++2b Status has the full overview of libc++’s C++2b implementation status.
API Changes
By default, libc++ will _not_ include the definition for new and delete, since those are provided in libc++abi. Vendors wishing to provide new and delete in libc++ can build the library with -DLIBCXX_ENABLE_NEW_DELETE_DEFINITIONS=ON to get back the old behavior. This was done to avoid providing new and delete in both libc++ and libc++abi, which is technically an ODR violation. Also note that we couldn’t decide to put the operators in libc++ only, because they are needed from libc++abi (which would create a circular dependency).
During the C++20 standardization process some new low-level bit functions have been renamed. Libc++ has renamed these functions to match the C++20 Standard. - ispow2 has been renamed to has_single_bit - ceil2 has been renamed to bit_ceil - floor2 has been renamed to bit_floor - log2p1 has been renamed to bit_width
In C++20 mode, std::filesystem::path::u8string() and generic_u8string() now return std::u8string according to P0428, while they return std::string in C++17. This can cause source incompatibility, which is discussed and acknowledged in P1423, but that paper doesn’t suggest any remediation for this incompatibility.
Libc++ 9.0.0
Fixes
Minor fixes to std::chrono operators.
libc++ now correctly handles Objective-C++ ARC qualifiers in std::is_pointer.
std::span general updates and fixes.
Updates to the std::abs implementation.
std::to_chars now adds leading zeros.
Ensure std::tuple is trivially constructible.
std::aligned_union now works in C++03.
Output of nullptr to std::basic_ostream is formatted properly.
Features
Implemented P0608: sane variant converting constructor.
Added ssize function.
Added front and back methods in std::span.
std::is_unbounded_array and std::is_bounded_array added to type traits.
std::atomic now includes many new features and specialization including improved Freestanding support.
Added std::midpoint and std::lerp math functions.
Added the function std::is_constant_evaluated.
Erase-like algorithms now return size type.
Added contains method to container types.
std::swap is now a constant expression.
Updates
libc++ dropped support for GCC 4.9; we now support GCC 5.1 and above.
libc++ added explicit support for WebAssembly System Interface (WASI).
Progress towards full support of rvalues and variadics in C++03 mode. std::move and std::forward now both work in C++03 mode.
LLVM 8.0.1 is now available! Download it now, or read the release notes.
This release contains bug-fixes for the LLVM 8.0.0 release. This
release is API and ABI compatible with 8.0.0.
What’s New in Libc++ 8.0.0?
API Changes
Building libc++ for Mac OSX 10.6 is not supported anymore.
Starting with LLVM 8.0.0, users that wish to link together translation units built with different versions of libc++’s headers into the same final linked image MUST define the _LIBCPP_HIDE_FROM_ABI_PER_TU macro to 1 when building those translation units. Not defining _LIBCPP_HIDE_FROM_ABI_PER_TU to 1 and linking translation units built with different versions of libc++’s headers together may lead to ODR violations and ABI issues. On the flipside, code size improvements should be expected for everyone not defining the macro.
Starting with LLVM 8.0.0, std::dynarray has been removed from the library. std::dynarray was a feature proposed for C++14 that was pulled from the Standard at the last minute and was never standardized. Since there are no plans to standardize this facility it is being removed.
Starting with LLVM 8.0.0, std::bad_array_length has been removed from the library. std::bad_array_length was a feature proposed for C++14 alongside std::dynarray, but it never actually made it into the C++ Standard. There are no plans to standardize this feature at this time. Formally speaking, this removal constitutes an ABI break because the symbols were shipped in the shared library. However, on macOS systems, the feature was not usable because it was hidden behind availability annotations. We do not expect any actual breakage to happen from this change.
LLVM 7.0.0 Release
The release contains the work on trunk up to SVN revision 338536 plus
work on the release branch. It is the result of the community's work
over the past six months, including: function multiversioning in Clang
with the 'target' attribute for ELF-based x86/x86_64 targets, improved
PCH support in clang-cl, preliminary DWARF v5 support, basic support
for OpenMP 4.5 offloading to NVPTX, OpenCL C++ support, MSan, X-Ray
and libFuzzer support for FreeBSD, early UBSan, X-Ray and libFuzzer
support for OpenBSD, UBSan checks for implicit conversions, many
long-tail compatibility issues fixed in lld which is now production
ready for ELF, COFF and MinGW, new tools llvm-exegesis, llvm-mca and
diagtool. And as usual, many optimizations, improved diagnostics, and
bug fixes.
For more details, see the release notes:
https://llvm.org/releases/7.0.0/docs/ReleaseNotes.htmlhttps://llvm.org/releases/7.0.0/tools/clang/docs/ReleaseNotes.htmlhttps://llvm.org/releases/7.0.0/tools/clang/tools/extra/docs/ReleaseNotes.htmlhttps://llvm.org/releases/7.0.0/tools/lld/docs/ReleaseNotes.html
libc++ is a new implementation of the C++ standard library, targeting
C++11.
Features and Goals
* Correctness as defined by the C++11 standard.
* Fast execution.
* Minimal memory use.
* Fast compile times.
* ABI compatibility with gcc's libstdc++ for some low-level features
such as exception objects, rtti and memory allocation.
* Extensive unit tests.
