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Remove -U_FORTIFY_SOURCE when thin_lto is enabled #15433

Merged
merged 1 commit into from
May 9, 2022
Merged

Remove -U_FORTIFY_SOURCE when thin_lto is enabled #15433

merged 1 commit into from
May 9, 2022

Commits on May 9, 2022

  1. Remove -U_FORTIFY_SOURCE when thin_lto is enabled 

    Clang does not accept `-U` flags when doing lto backend actions:

```
clang: error: argument unused during compilation: '-U _FORTIFY_SOURCE' [-Werror,-Wunused-command-line-argument]
```

This isn't a problem for `-D` flags because of a special case:

https://github.com/llvm/llvm-project/blob/10e99eb7e4adbb8e2407e2f6ae3d2e6420d060c9/clang/lib/Driver/ToolChains/Clang.cpp#L5579-L5582

Closes #15007.

PiperOrigin-RevId: 440314037
    @keith @ckolli5
    keith authored and ckolli5 committed May 9, 2022
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