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doc/stdenv: hardening flags: add example error for trivialautovarinit

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Robert Scott 2024-06-08 12:53:14 +01:00
parent 83ebc1143f
commit f52a4c6810
1 changed files with 6 additions and 0 deletions
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doc/stdenv/stdenv.chapter.md
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@ -1538,6 +1538,12 @@ Adds the `-ftrivial-auto-var-init=pattern` compiler option. This causes "trivial
Use of this flag is controversial as it can prevent tools that detect uninitialized variable use (such as valgrind) from operating correctly.
This should be turned off or fixed for build errors such as:
```
sorry, unimplemented: __builtin_clear_padding not supported for variable length aggregates
```
#### `stackclashprotection` {#stackclashprotection}
This flag adds the `-fstack-clash-protection` compiler option, which causes growth of a program's stack to access each successive page in order. This should force the guard page to be accessed and cause an attempt to "jump over" this guard page to crash.