rust/doc/errors.md

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# Common errors
This file lists errors that were encountered and how to fix them.
### `failed to build archive` error
When you get this error:
```
error: failed to build archive: failed to open object file: No such file or directory (os error 2)
```
That can be caused by the fact that you try to compile with `lto = "fat"`, but you didn't compile the sysroot with LTO.
(Not sure if that's the reason since I cannot reproduce anymore. Maybe it happened when forgetting setting `FAT_LTO`.)
### ld: cannot find crtbegin.o
When compiling an executable with libgccijt, if setting the `*LIBRARY_PATH` variables to the install directory, you will get the following errors:
```
ld: cannot find crtbegin.o: No such file or directory
ld: cannot find -lgcc: No such file or directory
ld: cannot find -lgcc: No such file or directory
libgccjit.so: error: error invoking gcc driver
```
To fix this, set the variables to `gcc-build/build/gcc`.