[lld] [AArch64][GCS][LLD] Introduce -zgcs-report-dynamic Command Line Option (PR #127787)

[Peter Smith via llvm-commits]

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@@ -918,6 +918,60 @@ void ObjFile<ELFT>::initializeSections(bool ignoreComdats,
     handleSectionGroup<ELFT>(this->sections, entries);
 }
 
+template <typename ELFT>
+static void parseGnuPropertyNote(Ctx &ctx, uint32_t &featureAndType,
+                                 ArrayRef<uint8_t> &desc, ELFFileBase *f,
+                                 const uint8_t *base,
+                                 ArrayRef<uint8_t> *data = nullptr,
+                                 StringRef sectionName = ".note.gnu.property") {
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smithp35 wrote:

In this case I don't think the extra code to handle an ELF Note section of type `NT_GNU_PROPERTY_TYPE_0` but with a non standard name is worth it. In theory tools could handle it but in practice it looks like they don't. For example LLD only processes the section if it has that specific name https://github.com/llvm/llvm-project/blob/main/lld/ELF/InputFiles.cpp#L1060

For reference: the specification (https://github.com/hjl-tools/linux-abi/wiki/linux-abi-draft.pdf) defines the name to be `.note.gnu.property`, although the name doesn't have to be significant as the type field can be used. 

https://github.com/llvm/llvm-project/pull/127787