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Add ArchiveHandle for reading static archives - #63
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Static libraries (`libfoo.a`, `foo.lib`) are `ar` archives of object files. `readmeta(io, ArchiveHandle)` lists an archive's members, and `readmeta(ah, member)` / `read(ah, member)` open one as an object file or read its contents. Each member starts with an `ArchiveMemberHeader`. `ar` has no single specification: each kind of archive (GNU, BSD and COFF, and the 64-bit variants of the former two) indexes its symbols and stores long member names in members of its own reserved names. As in LLVM, the kind is determined once from the first member(s), see `archive_kind()`, and member names are then decoded by that kind's rules only, with its symbol and name tables only accepted where they belong. GNU thin archives, whose members are stored outside of the archive, are supported too. `ArchiveHandle` is not registered in `ObjTypes`, so `readmeta(io)` still only returns object files: existing callers that iterate the result of `readmeta(io)` would otherwise start receiving archives. The test fixtures are generated by `test/archives/build.sh`. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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## master #63 +/- ##
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+ Coverage 69.94% 71.84% +1.90%
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Files 46 47 +1
Lines 1364 1488 +124
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Add preliminary static library (
.a) support. Read the archive withreadmeta(io, ArchiveHandle)to list an archive's members, and usereadmeta(ah, member)/read(ah, member)open one as an object file or read its contents.Intentionally not supported in
readmeta(io)(i.e. no explicitArchiveHandle), since many callers assume that the result is an object file (not an archive) of the expected type on their platform.Assisted-by: Claude Code (Opus 5.5) 🤖