58df0ef89d
While building llvm (clang, lld) against emscripten we see this [error](https://github.com/emscripten-forge/recipes/actions/runs/13803029307/job/38608794602#step:9:1715) ``` │ │ In file included from $SRC_DIR/llvm/lib/Frontend/OpenACC/ACC.cpp:9: │ │ $SRC_DIR/build/include/llvm/Frontend/OpenACC/ACC.h.inc:192:1: error: unknown type name 'LLVM_ABI' │ │ 192 | LLVM_ABI Directive getOpenACCDirectiveKind(llvm::StringRef Str); │ │ | ^ │ │ $SRC_DIR/build/include/llvm/Frontend/OpenACC/ACC.h.inc:192:19: error: expected ';' after top level declarator │ │ 192 | LLVM_ABI Directive getOpenACCDirectiveKind(llvm::StringRef Str); │ │ | ^ ``` Now this was happening because we weren't defining LLVM_ABI correctly when building against emscripten. If you see [llvm/Support/Compiler.h](https://github.com/llvm/llvm-project/blob/main/llvm/include/llvm/Support/Compiler.h#L206-L210), the condition only checked for the platform __WASM__ . Now Emscripten targets WebAssembly but doesn't imply the platform by default so the check isn't complete to define LLVM_ABI. The successful build after using this patch can be seen [here](https://github.com/emscripten-forge/recipes/actions/runs/13805214092/job/38614585621) (cherry picked from commit e57cd100ca297cf81854e35cccbf703edddd4aad)
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