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Clarify -Cllvm-args forwarding to GCC in Readme #803

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Nov 23, 2025
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Clarify -Cllvm-args forwarding to GCC in Readme #803

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Clarify -Cllvm-args forwarding to GCC in Readme
harin-ramesh Nov 23, 2025
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docs: Move -Cllvm-args forwarding explanation to tips.md
harin-ramesh Nov 23, 2025
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8 changes: 8 additions & 0 deletions doc/tips.md
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Expand Up @@ -9,6 +9,14 @@ be useful.
CG_RUSTFLAGS="-Clink-args=-save-temps -v" ../y.sh cargo build
```

### How to send arguments to GCC

The `-Cllvm-args` `rustc` flag is repurposed by `rustc_codegen_gcc` to pass arguments directly to the GCC backend. You can use it via the `CG_RUSTFLAGS` environment variable. For example, to pass a `-f` flag to GCC:

```
CG_RUSTFLAGS="-Cllvm-args=-fflag-name" ../y.sh cargo build
```

### How to see the personality functions in the asm dump

```
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