[qt/clang/llvm]: Summary of bulk changes made

Git repository change summary for qt/clang/llvm
Pushed by mirror-service into branch 'upstream/users/arsenm/triple-cmake-system-name'.
Changed from ce3187a10bc37edc179b46e75038307d16da7fd2 to 57b145d30ff719c9df36d6da03093f57b93c6d63
Acknowledgement was received that this change introduces only existing code that has been pushed to another public open source repository.

This change contains the following new commits:

Git commit 69685bb9ce2dc1976b9f4f852caaebdfd98485d1 by GitHub (on behalf of Louis Dionne) on 31/07/2026 at 17:20..
[libc++] Actually partially populate the container in a benchmark (#213146)

The "partially populated" variant of assignment was a copy-paste of the
"into cleared container" assignment.
https://invent.kde.org/qt/clang/llvm/-/commit/69685bb9ce2dc1976b9f4f852caaebdfd98485d1

Git commit dac66ca4776b18304249bb3a37f08915e5ad1bf4 by GitHub (on behalf of Louis Dionne) on 31/07/2026 at 17:21..
[libc++] Fix dangling reference in the associative container benchmarks (#213139)

Two insert benchmarks were registered with lambdas capturing insert_iter_iter_bench
by reference, unlike every other registration in this file, which captures by value.

RegisterBenchmark() stores the lambda by value and only invokes it from
RunSpecifiedBenchmarks(), which happens long after associative_container_benchmarks()
has returned, creating a dangling reference.
https://invent.kde.org/qt/clang/llvm/-/commit/dac66ca4776b18304249bb3a37f08915e5ad1bf4

Git commit 194d7d819f3ccf15c836323bc0efa34920045c0d by GitHub (on behalf of Timm Baeder) on 31/07/2026 at 17:21..
[llvm] Include ArrayRef.h in GenericCycleInfo.h (#213267)

Try to fix the llvm-x86_64-debian-dylib builder, which has been broken
for a while with:

```
CCACHE_CPP2=yes CCACHE_HASHDIR=yes CCACHE_SLOPPINESS=pch_defines,time_macros /usr/bin/ccache /usr/bin/clang++ -DLLVM_EXPORTS -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/b/1/llvm-x86_64-debian-dylib/build/lib/CodeGen -I/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/lib/CodeGen -I/b/1/llvm-x86_64-debian-dylib/build/include -I/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/include -fPIC -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -UNDEBUG -fno-exceptions -funwind-tables -fno-rtti -std=c++17 -MD -MT lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/CodeGenPrepare.cpp.o -MF lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/CodeGenPrepare.cpp.o.d -o lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/CodeGenPrepare.cpp.o -c /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/lib/CodeGen/CodeGenPrepare.cpp
In file included from /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/lib/CodeGen/CodeGenPrepare.cpp:53:
In file included from /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/include/llvm/IR/CycleInfo.h:18:
/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/include/llvm/ADT/GenericCycleInfo.h:231:33: error: member reference base type 'ArrayRef' is not a structure or union
    return ArrayRef(BlockLayout).slice(Cyc.EntryBegin, Cyc.EntrySize);
           ~~~~~~~~~~~~~~~~~~~~~^~~~~~
```

see e.g.
https://lab.llvm.org/buildbot/#/builders/60/builds/5422/steps/5/logs/stdio


I'm not sure if this will help or not, I can't reproduce this locally
and nobody else seems to have the same problem(?).
https://invent.kde.org/qt/clang/llvm/-/commit/194d7d819f3ccf15c836323bc0efa34920045c0d

Git commit 9bc2dd1a7015b58c9c68e8174e5d2756d955c0ca by GitHub (on behalf of Louis Dionne) on 31/07/2026 at 17:21..
[libc++] Add an assertion for monotonic_buffer_resource's initial_size (#213136)

[mem.res.monotonic.buffer.ctor] requires initial_size to be greater than
zero for the two constructors that take one, but we silently accepted
zero. Add a hardening assertion for that precondition.

Fixes #213059
https://invent.kde.org/qt/clang/llvm/-/commit/9bc2dd1a7015b58c9c68e8174e5d2756d955c0ca

Git commit c433135c99fc3306ae93fa8cff9e5c00ad0ece3c by GitHub (on behalf of Louis Dionne) on 31/07/2026 at 17:25..
[libc++] Remove unused headers from <cmath> (#213114)

I believe these headers were relevant when we actually implemented
functions in `<cmath>`, but they are not anymore. Note that ::hypot in
particular is obtained from <math.h> like all the other math functions.

Co-authored-by: A. Jiang <[email protected]>
https://invent.kde.org/qt/clang/llvm/-/commit/c433135c99fc3306ae93fa8cff9e5c00ad0ece3c

Git commit 93da16b5edbd9b6b3e66199ec05012be22e3d306 by GitHub (on behalf of Vicky Nguyen) on 31/07/2026 at 17:27..
[CIR][AArch64] Upstream store (vstrq_p128) NEON builtins (#212677)

Related to https://github.com/llvm/llvm-project/issues/185382

CIR lowering for store intrinsics (`vstrq_p128`)
(https://arm-software.github.io/acle/neon_intrinsics/advsimd.html#store)

Port test from `clang/test/CodeGen/AArch64/poly128.c` to
`clang/test/CodeGen/AArch64/neon/store.c`
https://invent.kde.org/qt/clang/llvm/-/commit/93da16b5edbd9b6b3e66199ec05012be22e3d306

Git commit 0aa3c9e671fd54083c8c6484fbcfa4c4e36619b6 by GitHub (on behalf of Matt Arsenault) on 31/07/2026 at 17:29..
AMDGPU: Add missing smem-prefetch-insts to gfx12.5/gfx13 feature map (#213297)

fillAMDGCNFeatureMap omitted smem-prefetch-insts for gfx125x and gfx13,
so clang wrongly rejected __builtin_amdgcn_s_prefetch_data / _inst /
s_buffer_prefetch_data.

Co-authored-by: Claude (Claude-Opus-4.8)
https://invent.kde.org/qt/clang/llvm/-/commit/0aa3c9e671fd54083c8c6484fbcfa4c4e36619b6

Git commit 57b145d30ff719c9df36d6da03093f57b93c6d63 by Matt Arsenault on 31/07/2026 at 18:21..
cmake: Derive CMake system name from a triple via new mechanism

This is a reimplementation of the cmake functionality first implemented in
6e4e181c83, which has now been reverted twice. Implement the raw cmake functionality
without introducing the uses yet.

The runtimes build needs to translate the build target (configured with a target
triple) to cmake's naming scheme, to use for CMAKE_SYSTEM_NAME. Use the OS/environment
list from TargetParser as the source of truth; add an additional entry for the
cmake name to ensure the build system and compiler always recognize the same set
of names.

Upgrade the previous cmake regexes to a new python script which parses the
authoritative def file. The new script logic should match Triple::normalize's
permissiveness for various legacy and malformed triple shapes. This should be
more maintainable than the previous cmake regexes, since there's now a unit test
mirroring the triple unit test.

Co-Authored-By: Claude (Opus 4.8) <[email protected]>
https://invent.kde.org/qt/clang/llvm/-/commit/57b145d30ff719c9df36d6da03093f57b93c6d63