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Fix SupportsSeeking detection on windows.

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Will be tested by existing tests once used (soon).

llvm-svn: 234737
This commit is contained in:
Rafael Espindola 2015-04-13 11:09:48 +00:00
parent e206f50870
commit f087ddcbc4
1 changed files with 7 additions and 0 deletions
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7
lib/Support/raw_ostream.cpp
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@ -525,7 +525,14 @@ raw_fd_ostream::raw_fd_ostream(int fd, bool shouldClose, bool unbuffered)
// Get the starting position.
off_t loc = ::lseek(FD, 0, SEEK_CUR);
#ifdef LLVM_ON_WIN32
// MSVCRT's _lseek(SEEK_CUR) doesn't return -1 for pipes.
sys::fs::file_status Status;
std::error_code EC = status(FD, Status);
SupportsSeeking = !EC && Status.type() == sys::fs::file_type::regular_file;
#else
SupportsSeeking = loc != (off_t)-1;
#endif
if (!SupportsSeeking)
pos = 0;
else