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af070e4f0c
When updating an existing archive, llvm-ar opens the old archive into a `MemoryBuffer`, does its thing, and writes the results to a temporary file. That file is then renamed to the original archive filename, thus replacing it with the updated contents. However, on Windows at least, what would happen is that the `MemoryBuffer` for the old archive would actually be an mmap'ed view of the file, so when it came time to do the rename via Win32's `ReplaceFile`, it would succeed but would be unable to fully replace the file since there would still be a handle open on it; instead, the old version got renamed to a random temporary name and left behind. Patch by Cameron! llvm-svn: 268916
49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
//===- ArchiveWriter.h - ar archive file format writer ----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Declares the writeArchive function for writing an archive file.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_OBJECT_ARCHIVEWRITER_H
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#define LLVM_OBJECT_ARCHIVEWRITER_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Object/Archive.h"
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#include "llvm/Support/FileSystem.h"
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namespace llvm {
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class NewArchiveIterator {
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bool IsNewMember;
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StringRef Name;
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object::Archive::Child OldMember;
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public:
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NewArchiveIterator(const object::Archive::Child &OldMember, StringRef Name);
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NewArchiveIterator(StringRef FileName);
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bool isNewMember() const;
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StringRef getName() const;
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const object::Archive::Child &getOld() const;
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StringRef getNew() const;
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llvm::ErrorOr<int> getFD(sys::fs::file_status &NewStatus) const;
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const sys::fs::file_status &getStatus() const;
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};
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std::pair<StringRef, std::error_code>
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writeArchive(StringRef ArcName, std::vector<NewArchiveIterator> &NewMembers,
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bool WriteSymtab, object::Archive::Kind Kind, bool Deterministic,
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bool Thin, std::unique_ptr<MemoryBuffer> OldArchiveBuf = nullptr);
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}
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#endif
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