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Author SHA1 Message Date
Reid Kleckner 97b7e26d13 Disable failing TestDevNull test on Windows 
llvm-svn: 236126
 2015-04-29 16:54:11 +00:00
Rafael Espindola c54a0d0bf4 Relax assert to avoid spurious failures with /dev/null. 
llvm-svn: 236106
 2015-04-29 14:53:25 +00:00
Rafael Espindola 4ba9af1141 Don't allow pwrite to resize a stream. 
The current implementations could exhibit some behavior differences:

raw_fd_ostream: Whatever the underlying fd does with seek+write. In a normal
file, the write position would be back to the old offset.

raw_svector_ostream: The write position is always the end of the stream, so
after pwrite the write position would be the new end. This matches what OS_X
(all BSD?) do with a pwrite in a O_APPEND fd.

Given that we don't need that feature and don't use O_APPEND a lot in LLVM,
just disallow it.

I am open to suggestions on renaming pwrite to something else, but this fixes
the issue for now.

Thanks to Yaron Keren for reporting it.

llvm-svn: 235303
 2015-04-20 13:04:30 +00:00
Rafael Espindola 37b7015916 Add raw_pwrite_stream type. 
This is a raw_ostream that also supports pwrite.
I will be used in a sec.

llvm-svn: 234895
 2015-04-14 15:00:34 +00:00