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Update llvm-libc readme to LLVM 21.1.8 #26157

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Merged
sbc100 merged 1 commit into from
Jan 23, 2026
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Update llvm-libc readme to LLVM 21.1.8 #26157

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16 changes: 15 additions & 1 deletion system/lib/llvm-libc/readme.txt
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Original file line number Diff line number Diff line change
@@ -1,7 +1,14 @@
llvm's libc
-----------

These files are from llvm-project's HEAD.
These files are from the llvm-project based on release 21.1.8.

We maintain a local fork of llvm-project that contains any Emscripten
specific patches:

https://github.com/emscripten-core/llvm-project

The current patch is based on the emscripten-libs-21 branch.

Currently in production, we do not use LLVM's libc directly yet, but libcxx uses
a subset of headers from libc. So libcxx directly depends on the following
Expand All @@ -21,3 +28,10 @@ Update Instructions

Run `system/lib/update_libcxx.py path/to/llvm-project`
Run `system/lib/update_llvm_libc.py path/to/llvm-project`

Modifications
-------------

For a list of changes from upstream see the libcxx files that are part of:

https://github.com/llvm/llvm-project/compare/llvmorg-21.1.8...emscripten-core:emscripten-libs-21