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Revert create_symbolic_link and both depending changes

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This reverts commits r203136, r203137, and r203138.

This code doesn't build on Windows.  Even on Vista+, Windows requires
elevated privileges to create a symlink.  Therefore we can't use
symlinks in the compiler.  We'll have to find another approach.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203143 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner 2014-03-06 19:07:35 +00:00
parent 6c43168ce3
commit bbf1c8d24c
4 changed files with 24 additions and 72 deletions
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8
include/llvm/Support/FileSystem.h
View File

@ -293,14 +293,6 @@ error_code create_directory(const Twine &path, bool IgnoreExisting = true);
/// , otherwise a platform specific error_code.
error_code create_hard_link(const Twine &to, const Twine &from);
/// @brief Create a symbolic link from \a from to \a to.
///
/// @param to The path to link to.
/// @param from The path to link from. This is created.
/// @returns errc::success if successful
/// , otherwise a platform specific error_code.
error_code create_symbolic_link(const Twine &to, const Twine &from);
/// @brief Get the current path.
///
/// @param result Holds the current path on return.

56
lib/Support/LockFileManager.cpp
View File

@ -115,42 +115,34 @@ LockFileManager::LockFileManager(StringRef FileName)
}
}
while (1) {
// Create a symbolic link from the lock file name. If this succeeds, we're
// done. Note that we are using symbolic link because hard links are not
// supported by all filesystems.
error_code EC
= sys::fs::create_symbolic_link(UniqueLockFileName.str(),
LockFileName.str());
if (EC == errc::success)
return;
// Create a hard link from the lock file name. If this succeeds, we're done.
error_code EC
= sys::fs::create_hard_link(UniqueLockFileName.str(),
LockFileName.str());
if (EC == errc::success)
return;
if (EC != errc::file_exists) {
Error = EC;
return;
}
// Creating the hard link failed.
// Someone else managed to create the lock file first. Read the process ID
// from the lock file.
if ((Owner = readLockFile(LockFileName))) {
// Wipe out our unique lock file (it's useless now)
sys::fs::remove(UniqueLockFileName.str());
return;
}
#ifdef LLVM_ON_UNIX
// The creation of the hard link may appear to fail, but if stat'ing the
// unique file returns a link count of 2, then we can still declare success.
struct stat StatBuf;
if (stat(UniqueLockFileName.c_str(), &StatBuf) == 0 &&
StatBuf.st_nlink == 2)
return;
#endif
if (!sys::fs::exists(LockFileName.str())) {
// The previous owner released the lock file before we could read it.
// Try to get ownership again.
continue;
}
// Someone else managed to create the lock file first. Wipe out our unique
// lock file (it's useless now) and read the process ID from the lock file.
sys::fs::remove(UniqueLockFileName.str());
if ((Owner = readLockFile(LockFileName)))
return;
// There is a lock file that nobody owns; try to clean it up and get
// ownership.
if ((EC = sys::fs::remove(LockFileName.str()))) {
Error = EC;
return;
}
}
// There is a lock file that nobody owns; try to clean it up and report
// an error.
sys::fs::remove(LockFileName.str());
Error = EC;
}
LockFileManager::LockFileState LockFileManager::getState() const {

13
lib/Support/Unix/Path.inc
View File

@ -285,19 +285,6 @@ error_code create_hard_link(const Twine &to, const Twine &from) {
return error_code::success();
}
error_code create_symbolic_link(const Twine &to, const Twine &from) {
// Get arguments.
SmallString<128> from_storage;
SmallString<128> to_storage;
StringRef f = from.toNullTerminatedStringRef(from_storage);
StringRef t = to.toNullTerminatedStringRef(to_storage);
if (::symlink(t.begin(), f.begin()) == -1)
return error_code(errno, system_category());
return error_code::success();
}
error_code remove(const Twine &path, bool IgnoreNonExisting) {
SmallString<128> path_storage;
StringRef p = path.toNullTerminatedStringRef(path_storage);

19
lib/Support/Windows/Path.inc
View File

@ -177,25 +177,6 @@ error_code create_hard_link(const Twine &to, const Twine &from) {
return error_code::success();
}
error_code create_symbolic_link(const Twine &to, const Twine &from) {
// Get arguments.
SmallString<128> from_storage;
SmallString<128> to_storage;
StringRef f = from.toStringRef(from_storage);
StringRef t = to.toStringRef(to_storage);
// Convert to utf-16.
SmallVector<wchar_t, 128> wide_from;
SmallVector<wchar_t, 128> wide_to;
if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
if (!::CreateSymbolicLinkW(wide_from.begin(), wide_to.begin(), NULL))
return windows_error(::GetLastError());
return error_code::success();
}
error_code remove(const Twine &path, bool IgnoreNonExisting) {
SmallString<128> path_storage;
SmallVector<wchar_t, 128> path_utf16;