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Author SHA1 Message Date
Rafael Espindola 2f16bc1095 Use raw_pwrite_stream in clang. 
This is a small improvement to -emit-pth and allows llvm to start requiring it.

llvm-svn: 234897
 2015-04-14 15:15:49 +00:00
Rafael Espindola 463d4dd6c6 Bring r234620 back now that llvm is fixed. 
LLVM can now detect if a fd is seekable on windows.

Original commit message:

Actually check if lseek works instead of using a filename based heuristic.

llvm-svn: 234738
 2015-04-13 11:14:39 +00:00
NAKAMURA Takumi 90a4877e31 Revert r234620 and others, "Actually check if lseek works instead of using a filename based heuristic." It was affected by r234615, which was reverted in r234721. 
r234620, "Actually check if lseek works instead of using a filename based heuristic."
  r234621, "Testcase for the previous commit."
  r234718, "Suppress clang/test/PCH/emit-pth.c on win32, for now while investigating."

llvm-svn: 234730
 2015-04-13 08:43:31 +00:00
NAKAMURA Takumi 73d0280db6 Suppress clang/test/PCH/emit-pth.c on win32, for now while investigating. 
MSVCRT's _lseek(SEEK_CUR) doesn't return -1 for raw_ostream::SupportSeeking.

llvm-svn: 234718
 2015-04-13 00:30:23 +00:00
Rafael Espindola c8bc303faa Testcase for the previous commit. 
Sorry, fogot to "git add" the previous time.

llvm-svn: 234621
 2015-04-10 18:18:17 +00:00