[clang] [WebAssembly] Change the default linker for `wasm32-wasip2` (PR #84569)

[Cheng Shao via cfe-commits]

TerrorJack wrote:

@alexcrichton This is breaking `wasi-sdk` build with:

```
/workspace/wasi-sdk/build/install/opt/wasi-sdk/bin/clang --target=wasm32-wasip2 
-nodefaultlibs -shared 
--sysroot=/workspace/wasi-sdk/build/install/opt/wasi-sdk/share/wasi-sysroot \
-o 
/workspace/wasi-sdk/build/install/opt/wasi-sdk/share/wasi-sysroot/lib/wasm32-wasip2/libc.so
 -Wl,--whole-archive build/wasm32-wasip2/libc.so.a -Wl,--no-whole-archive 
/workspace/wasi-sdk/build/install/opt/wasi-sdk/lib/clang/19/lib/wasi/libclang_rt.builtins-wasm32.a
error: unexpected argument '--entry' found

  tip: a similar argument exists: '--no-entry'

Usage: wasm-component-ld -o  --wasm-ld-path  <--export 
|-z 
|--stack-first|--allow-undefined|--fatal-warnings|--no-demangle|--gc-sections|-O
 |-L |-l |--no-entry|-m 
|--strip-all|OBJECTS>

For more information, try '--help'.
clang: error: linker command failed with exit code 2 (use -v to see invocation)
make[1]: *** [Makefile:569: 
/workspace/wasi-sdk/build/install/opt/wasi-sdk/share/wasi-sysroot/lib/wasm32-wasip2/libc.so]
 Error 2
make[1]: Leaving directory '/workspace/wasi-sdk/src/wasi-libc'
make: *** [Makefile:142: build/wasi-libc.BUILT] Error 2
```

https://github.com/llvm/llvm-project/pull/84569
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[clang] [libc] [openmp] [clang-tools-extra] [compiler-rt] [mlir] [lldb] [lld] [llvm] [flang] [libcxx] [Driver] Report invalid target triple versions for all environment types. (PR #78655)

[Cheng Shao via cfe-commits]

TerrorJack wrote:

FYI this change breaks `wasi-sdk`/`wasi-libc` build with:

```
clang: error: version 'preview2' in target triple 
'wasm32-unknown-wasi-preview2' is invalid
```

https://github.com/llvm/llvm-project/pull/78655
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[clang] [clang] Add nuw attribute to GEPs (PR #105496)

[Cheng Shao via cfe-commits]

TerrorJack wrote:

This breaks wasm codegen: https://github.com/llvm/llvm-project/issues/108770

https://github.com/llvm/llvm-project/pull/105496
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