llvm-project

93bc18ff - [lld][macho] Fix thunks with multiple text sections (#199747)

[lld][macho] Fix thunks with multiple text sections (#199747) When there are multiple `__text` sections, LLD might not generate thunks to stubs sections when they are required, leading to relocation errors. ``` ld64.lld: error: a.o:(symbol _foo+0x0): relocation BRANCH26 is out of range: 134217744 is not in [-134217728, 134217727]; references _extern_sym ``` Create `TextOutputSection::estimateStubsEndVA()` to correctly estimate the end VA of the last stubs section so we can tell when branches to stub symbols will be in range. Technically this could cause lld to generate more thunks in some cases. If a binary requires thunks (the `__TEXT` segment is >128MiB) and has multiple `__text` sections like `__text_cold` or `__lcxx_override`, then all branches to stub symbols will require thunks. Without this change we could get the relocation errors above. We might be able to workaround the problem by placing the `__text` section last. Fixes https://github.com/llvm/llvm-project/issues/195387.