[lld] [LLD] Add support for two special OpenBSD sections (PR #97122)

[John Ericson via llvm-commits]

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@@ -107,7 +107,8 @@ static StringRef getOutputSectionName(const InputSectionBase *s) {
   for (StringRef v :
        {".data.rel.ro", ".data", ".rodata", ".bss.rel.ro", ".bss", ".ldata",
         ".lrodata", ".lbss", ".gcc_except_table", ".init_array", ".fini_array",
-        ".tbss", ".tdata", ".ARM.exidx", ".ARM.extab", ".ctors", ".dtors"})
+        ".tbss", ".tdata", ".ARM.exidx", ".ARM.extab", ".ctors", ".dtors",
+        ".openbsd.randomdata", ".openbsd.mutable"})
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Ericson2314 wrote:

I have not tried to bisect this patch, but I can assure you that with out my "hello world' did not run (because malloc in OpenBSD's libc uses `.openbsd.mutable` for the root object of the heap, and there was an issue initializing it).

OpenBSD has a much faster-moving ABI, and I agree we wouldn't want that intentional stability to affect other platforms that are not opting into it. This is why I lean towards gating all these things under `config->osabi == ELFOSABI_FREEBSD` --- OpenBSD therefore has its own sandbox where it is sure not to affect other platforms. I just don't know how to set `config->osbi` from the command-line in a satisfactory way, hence https://github.com/llvm/llvm-project/issues/97124

https://github.com/llvm/llvm-project/pull/97122