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Some Windows SDK lacks pthread_sigmask() implementation and fails
to compile the recently updated "git push" codepath that uses it.
* jk/push-client-deadlock-fix:
Windows: only add a no-op pthread_sigmask() when needed
Windows: add pthread_sigmask() that does nothing
t5504: drop sigpipe=ok from push tests
fetch-pack: isolate sigpipe in demuxer thread
send-pack: isolate sigpipe in demuxer thread
run-command: teach async threads to ignore SIGPIPE
send-pack: close demux pipe before finishing async process
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In f924b52 (Windows: add pthread_sigmask() that does nothing,
2016-05-01), we introduced a no-op for Windows. However, this breaks
building Git in Git for Windows' SDK because pthread_sigmask() is
already a no-op there, #define'd in the pthread_signal.h header in
/mingw64/x86_64-w64-mingw32/include/.
Let's wrap the definition of pthread_sigmask() in a guard that skips
it when compiling with MinGW-w64' headers.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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A previous change introduced a call to pthread_sigmask() in order to block
SIGPIPE in a thread. Since there are no signal facilities on Windows that
are similar to POSIX signals, just ignore the request to block the signal.
In the particular case, the effect of blocking SIGPIPE on POSIX is that
write() calls return EPIPE when the reader closes the pipe. This is how
write() behaves on Windows.
Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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These were added by 8bf4bec (add "ok=sigpipe" to
test_must_fail and use it to fix flaky tests, 2015-11-27)
because we would racily die via SIGPIPE when the pack was
rejected by the other side.
But since we have recently de-flaked send-pack, we should be
able to tighten up these tests (including re-adding the
expected output checks).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In commit 9ff18fa (fetch-pack: ignore SIGPIPE in sideband
demuxer, 2016-02-24), we started using sigchain_push() to
ignore SIGPIPE in the async demuxer thread. However, this is
rather clumsy, as it ignores SIGPIPE for the entire process,
including the main thread. At the time we didn't have any
per-thread signal support, but we now we do. Let's use it.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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If we get an error from pack-objects, we may exit
send_pack() early, before reading the server's status
response. In such a case, we may racily see SIGPIPE from our
async demuxer (which is trying to write that status back to
us), and we'd prefer to continue pushing the error up the
call stack, rather than taking down the whole process with
signal death.
This is safe to do because our demuxer just calls
recv_sideband, whose data writes are all done with
write_or_die(), which will notice SIGPIPE.
We do also write sideband 2 to stderr, and we would no
longer die on SIGPIPE there (if it were piped in the first
place, and if the piped program went away). But that's
probably a good thing, as it likewise should not abort the
push process at all (neither immediately by signal, nor
eventually by reporting failure back to the main thread).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Async processes can be implemented as separate forked
processes, or as threads (depending on the NO_PTHREADS
setting). In the latter case, if an async thread gets
SIGPIPE, it takes down the whole process. This is obviously
bad if the main process was not otherwise going to die, but
even if we were going to die, it means the main process does
not have a chance to report a useful error message.
There's also the small matter that forked async processes
will not take the main process down on a signal, meaning git
will behave differently depending on the NO_PTHREADS
setting.
This patch fixes it by adding a new flag to "struct async"
to block SIGPIPE just in the async thread. In theory, this
should always be on (which makes async threads behave more
like async processes), but we would first want to make sure
that each async process we spawn is careful about checking
return codes from write() and would not spew endlessly into
a dead pipe. So let's start with it as optional, and we can
enable it for specific sites in future patches.
The natural name for this option would be "ignore_sigpipe",
since that's what it does for the threaded case. But since
that name might imply that we are ignoring it in all cases
(including the separate-process one), let's call it
"isolate_sigpipe". What we are really asking for is
isolation. I.e., not to have our main process taken down by
signals spawned by the async process. How that is
implemented is up to the run-command code.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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This fixes a deadlock on the client side when pushing a
large number of refs from a corrupted repo. There's a
reproduction script below, but let's start with a
human-readable explanation.
The client side of a push goes something like this:
1. Start an async process to demux sideband coming from
the server.
2. Run pack-objects to send the actual pack, and wait for
its status via finish_command().
3. If pack-objects failed, abort immediately.
4. If pack-objects succeeded, read the per-ref status from
the server, which is actually coming over a pipe from
the demux process started in step 1.
We run finish_async() to wait for and clean up the demux
process in two places. In step 3, if we see an error, we
want it to end early. And after step 4, it should be done
writing any data and we are just cleaning it up.
Let's focus on the error case first. We hand the output
descriptor to the server over to pack-objects. So by the
time it has returned an error to us, it has closed the
descriptor and the server has gotten EOF. The server will
mark all refs as failed with "unpacker error" and send us
back the status for each (followed by EOF).
This status goes to the demuxer thread, which relays it over
a pipe to the main thread. But the main thread never even
tries reading the status. It's trying to bail because of the
pack-objects error, and is waiting for the demuxer thread to
finish. If there are a small number of refs, that's OK; the
demuxer thread writes into the pipe buffer, sees EOF from
the server, and quits. But if there are a large number of
refs, it may block on write() back to the main thread,
leading to a deadlock (the main thread is waiting for the
demuxer to finish, the demuxer is waiting for the main
thread to read).
We can break this deadlock by closing the pipe between the
demuxer and the main thread before calling finish_async().
Then the demuxer gets a write() error and exits.
The non-error case usually just works, because we will have
read all of the data from the other side. We do close
demux.out already, but we only do so _after_ calling
finish_async(). This is OK because there shouldn't be any
more data coming from the server. But technically we've only
read to a flush packet, and a broken or malicious server
could be sending more cruft. In such a case, we would hit
the same deadlock. Closing the pipe first doesn't affect the
normal case, and means that for a cruft-sending server,
we'll notice a write() error rather than deadlocking.
Note that when write() sees this error, we'll actually
deliver SIGPIPE to the thread, which will take down the
whole process (unless we're compiled with NO_PTHREADS). This
isn't ideal, but it's an improvement over the status quo,
which is deadlocking. And SIGPIPE handling in async threads
is a bigger problem that we can deal with separately.
A simple reproduction for the error case is below. It's
technically racy (we could exit the main process and take
down the async thread with us before it even reads the
status), though in practice it seems to fail pretty
consistently.
git init repo &&
cd repo &&
# make some commits; we need two so we can simulate corruption
# in the history later.
git commit --allow-empty -m one &&
one=$(git rev-parse HEAD) &&
git commit --allow-empty -m two &&
two=$(git rev-parse HEAD) &&
# now make a ton of refs; our goal here is to overflow the pipe buffer
# when reporting the ref status, which will cause the demuxer to block
# on write()
for i in $(seq 20000); do
echo "create refs/heads/this-is-a-really-long-branch-name-$i $two"
done |
git update-ref --stdin &&
# now make a corruption in the history such that pack-objects will fail
rm -vf .git/objects/$(echo $one | sed 's}..}&/}') &&
# and then push the result
git init --bare dst.git &&
git push --mirror dst.git
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git mv old new" did not adjust the path for a submodule that lives
as a subdirectory inside old/ directory correctly.
* sb/mv-submodule-fix:
mv: allow moving nested submodules
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When directories are moved using `git mv` all files in the directory
have been just moved, but no further action was taken on them. This
was done by assigning the mode = WORKING_DIRECTORY to the files
inside a moved directory.
submodules however need to update their link to the git directory as
well as updates to the .gitmodules file. By removing the condition of
`mode != INDEX` (the remaining modes are BOTH and WORKING_DIRECTORY) for
the required submodule actions, we perform these for submodules in a
moved directory.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The "user.useConfigOnly" configuration variable makes it an error
if users do not explicitly set user.name and user.email. However,
its check was not done early enough and allowed another error to
trigger, reporting that the default value we guessed from the
system setting was unusable. This was a suboptimal end-user
experience as we want the users to set user.name/user.email without
relying on the auto-detection at all.
* da/user-useconfigonly:
ident: give "please tell me" message upon useConfigOnly error
ident: check for useConfigOnly before auto-detection of name/email
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The env_hint message applies perfectly to the case when
user.useConfigOnly is set and at least one of the user.name and the
user.email are not provided.
Additionally, use a less descriptive error message to discourage
users from disabling user.useConfigOnly configuration variable to
work around this error condition. We want to encourage them to set
user.name or user.email instead.
Signed-off-by: Marios Titas <redneb@gmx.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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If user.useConfigOnly is set, it does not make sense to try to
auto-detect the name and/or the email. The auto-detection may
even result in a bogus name and trigger an error message.
Check if the use-config-only is set and die if no explicit name was
given, before attempting to auto-detect, to correct this.
Signed-off-by: Marios Titas <redneb@gmx.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The test scripts for "git p4" (but not "git p4" implementation
itself) has been updated so that they would work even on a system
where the installed version of Python is python 3.
* ld/p4-test-py3:
git-p4 tests: time_in_seconds should use $PYTHON_PATH
git-p4 tests: work with python3 as well as python2
git-p4 tests: cd to / before running python
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The time_in_seconds script should use $PYTHON_PATH, rather than
just hard-coded python, so that users can override which version
gets used, as is done for other python invocations.
Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Update the git-p4 tests so that they work with both
Python2 and Python3.
We have to be explicit about the difference between
Unicode text strings (Python3 default) and raw binary
strings which will be exchanged with Perforce.
Additionally, print always takes parentheses in Python3.
Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The python one-liner for getting the current time prints out
error messages if the current directory is deleted while it is
running if using python3.
Avoid these messages by switching to "/" before running it.
This problem does not arise if using python2.
Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git submodule" reports the paths of submodules the command
recurses into, but this was incorrect when the command was not run
from the root level of the superproject.
* sb/submodule-path-misc-bugs:
t7407: make expectation as clear as possible
submodule update: test recursive path reporting from subdirectory
submodule update: align reporting path for custom command execution
submodule status: correct path handling in recursive submodules
submodule update --init: correct path handling in recursive submodules
submodule foreach: correct path display in recursive submodules
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Not everyone (including me) grasps the sed expression in a split second as
they would grasp the 4 lines printed as is.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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This patch is just a test and fixes no bug as there is currently no bug
in the path handling of `submodule update`.
In `submodule update` we make a call to `submodule--helper list --prefix
"$wt_prefix"` which looks a bit brittle and likely to introduce a bug
for the path handling. It is not a bug as the prefix is ignored inside
the submodule helper for now. If this test breaks eventually, we want
to make sure the `wt_prefix` is passed correctly into recursive submodules.
Hint: In recursive submodules we expect `wt_prefix` to be empty.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In the predefined actions (merge, rebase, none, checkout), we use
the display path, which is relative to the current working directory.
Also use the display path when running a custom command.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The new test which is a replica of the previous test except
that it executes from a sub directory. Prior to this patch
the test failed by having too many '../' prefixed:
--- expect 2016-03-29 19:02:33.087336115 +0000
+++ actual 2016-03-29 19:02:33.359343311 +0000
@@ -1,7 +1,7 @@
b23f134787d96fae589a6b76da41f4db112fc8db ../nested1 (heads/master)
-+25d56d1ddfb35c3e91ff7d8f12331c2e53147dcc ../nested1/nested2 (file2)
- 5ec83512b76a0b8170b899f8e643913c3e9b72d9 ../nested1/nested2/nested3 (heads/master)
- 509f622a4f36a3e472affcf28fa959174f3dd5b5 ../nested1/nested2/nested3/submodule (heads/master)
++25d56d1ddfb35c3e91ff7d8f12331c2e53147dcc ../../nested1/nested2 (file2)
+ 5ec83512b76a0b8170b899f8e643913c3e9b72d9 ../../../nested1/nested2/nested3 (heads/master)
+ 509f622a4f36a3e472affcf28fa959174f3dd5b5 ../../../../nested1/nested2/nested3/submodule (heads/master)
0c90624ab7f1aaa301d3bb79f60dcfed1ec4897f ../sub1 (0c90624)
0c90624ab7f1aaa301d3bb79f60dcfed1ec4897f ../sub2 (0c90624)
509f622a4f36a3e472affcf28fa959174f3dd5b5 ../sub3 (heads/master)
The path code in question:
displaypath=$(relative_path "$prefix$sm_path")
prefix=$displaypath
if recursive:
eval cmd_status
That way we change `prefix` each iteration to contain another
'../', because of the the relative_path computation is done
on an already computed relative path.
We must call relative_path exactly once with `wt_prefix` non empty.
Further calls in recursive instances to to calculate the displaypath
already incorporate the correct prefix from before. Fix the issue by
clearing `wt_prefix` in recursive calls.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When calling `git submodule init` from a recursive instance of
`git submodule update --recursive`, the reported path is wrong as it
skips the nested submodules.
The new test demonstrates a failure in the code prior to this patch.
Instead of getting the expected
Submodule 'submodule' (${pwd}/submodule) registered for path '../super/submodule'
the `super` directory is omitted and you get
Submodule 'submodule' (${pwd}/submodule) registered for path '../submodule'
instead.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The `prefix` was put in front of the display path unconditionally.
This is wrong as any relative path computation would need to be at
the front, so include the prefix into the display path.
The new test replicates the previous test with the difference of executing
from a sub directory. By executing from a sub directory all we would
expect all displayed paths to be prefixed by '../'.
Prior to this patch the test would report
Entering 'nested1/nested2/../nested3'
instead of the expected
Entering '../nested1/nested2/nested3'
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Upcoming OpenSSL 1.1.0 will break compilation b updating a few APIs
we use in imap-send, which has been adjusted for the change.
* ky/imap-send-openssl-1.1.0:
configure: remove checking for HMAC_CTX_cleanup
imap-send: avoid deprecated TLSv1_method()
imap-send: check NULL return of SSL_CTX_new()
imap-send: use HMAC() function provided by OpenSSL
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We don't need it, as we no longer use HMAC_CTX_cleanup() directly.
Signed-off-by: Kazuki Yamaguchi <k@rhe.jp>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Use SSLv23_method always and disable SSL if needed.
TLSv1_method() function is deprecated in OpenSSL 1.1.0 and the compiler
emits a warning.
SSLv23_method() is also deprecated, but the alternative, TLS_method(),
is new in OpenSSL 1.1.0 so requires checking by configure. Stick to
SSLv23_method() for now (this is aliased to TLS_method()).
Signed-off-by: Kazuki Yamaguchi <k@rhe.jp>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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SSL_CTX_new() may fail with return value NULL.
Signed-off-by: Kazuki Yamaguchi <k@rhe.jp>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Fix compile errors with OpenSSL 1.1.0.
HMAC_CTX is made opaque and HMAC_CTX_cleanup is removed in OpenSSL
1.1.0. But since we just want to calculate one HMAC, we can use HMAC()
here, which exists since OpenSSL 0.9.6 at least.
Signed-off-by: Kazuki Yamaguchi <k@rhe.jp>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git replace -e" did not honour "core.editor" configuration.
* js/replace-edit-use-editor-configuration:
replace --edit: respect core.editor
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We simply need to read the config, is all.
This fixes https://github.com/git-for-windows/git/issues/733
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Minor code clean-up.
* cc/apply:
builtin/apply: free patch when parse_chunk() fails
builtin/apply: handle parse_binary() failure
apply: remove unused call to free() in gitdiff_{old,new}name()
builtin/apply: get rid of useless 'name' variable
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When parse_chunk() fails it can return -1, for example
when find_header() doesn't find a patch header.
In this case it's better in apply_patch() to free the
"struct patch" that we just allocated instead of
leaking it.
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In parse_binary() there is:
forward = parse_binary_hunk(&buffer, &size, &status, &used);
if (!forward && !status)
/* there has to be one hunk (forward hunk) */
return error(_("unrecognized binary patch at line %d"), linenr-1);
so parse_binary() can return -1, because that's what error() returns.
Also parse_binary_hunk() sets "status" to -1 in case of error and
parse_binary() does "if (status) return status;".
In this case parse_chunk() should not add -1 to the patchsize it computes.
It is better for future libification efforts to make it just return -1.
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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These two functions keep a copy of filename it was given, let
gitdiff_verify_name() to rewrite it to a new filename and then free
the original if they receive a newly minted filename.
However
(1) when the original name is NULL, gitdiff_verify_name() returns
either NULL or a newly minted value. Either case, we do not
have to worry about calling free() on the original NULL.
(2) when the original name is not NULL, gitdiff_verify_name()
either returns that as-is, or calls die() when it finds
inconsistency in the patch. When the function returns, we know
that "if ()" statement always is false.
Noticed by Christian Couder.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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While at it put an 'else' on the same line as the previous '}'.
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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A minor documentation update.
* kn/for-each-tag-branch:
for-each-ref: fix description of '--contains' in manpage
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'git for-each-ref's manpage says that '--contains' only lists tags,
but it lists all kinds of refs.
Signed-off-by: SZEDER Gábor <szeder@ira.uka.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The changes are described in CHANGES.
Contributions-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Contributions-by: Stefan Tatschner <rumpelsepp@sevenbyte.org>
Contributions-by: Simon P <simon.git@le-huit.fr>
Contributions-by: Leander Hasty <leander@1stplayable.com>
Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Code clean-up.
* jk/use-write-script-more:
t3404: use write_script
t1020: do not overuse printf and use write_script
t5532: use write_script
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The test uses hardcoded #!/bin/sh to create a pre-commit hook
script. Because the generated script uses $(command substitution),
which is not supported by /bin/sh on some platforms (e.g. Solaris),
the resulting pre-commit always fails.
Which is not noticeable as the test that uses the hook is about
checking the behaviour of the command when the hook fails ;-), but
nevertheless it is not testing what we wanted to test.
Use write_script so that the resulting script is run under the same
shell our scripted Porcelain commands are run, which must support
the necessary $(construct).
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The test prepares a sample file "dir/two" with a single incomplete
line in it with "printf", and also prepares a small helper script
"diff" to create a file with a single incomplete line in it, again
with "printf". The output from the latter is compared with an
expected output, again prepared with "printf" hence lacking the
final LF. There is no reason for this test to be using files with
an incomplete line at the end, and these look more like a mistake
of not using
printf "%s\n" "string to be written"
and using
printf "string to be written"
Depending on what would be in $GIT_PREFIX, using the latter form
could be a bug waiting to happen. Correct them.
Also, the test uses hardcoded #!/bin/sh to create a small helper
script. For a small task like what the generated script does, it
does not matter too much in that what appears as /bin/sh would not
be _so_ broken, but while we are at it, use write_script instead,
which happens to make the result easier to read by reducing need
of one level of quoting.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The recent cleanup in b7cbbff switched t5532's use of
backticks to $(). This matches our normal shell style, which
is good. But it also breaks the test on Solaris, where
/bin/sh does not understand $().
Our normal shell style assumes a modern-ish shell which
knows about $(). However, some tests create small helper
scripts and just write "#!/bin/sh" into them. These scripts
either need to go back to using backticks, or they need to
respect $SHELL_PATH. The easiest way to do the latter is to
use write_script.
While we're at it, let's also stick the script creation
inside a test_expect block (our usual style), and split the
perl snippet into its own script (to prevent quoting
madness).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Code cleanup.
* jc/xstrfmt-null-with-prec-0:
setup.c: do not feed NULL to "%.*s" even with precision 0
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A recent update 75faa45a (replace trivial malloc + sprintf / strcpy
calls with xstrfmt, 2015-09-24) rewrote
prepare an empty buffer
if (len)
append the first len bytes of "prefix" to the buffer
append "path" to the buffer
that computed "path", optionally prefixed by "prefix", into
xstrfmt("%.*s%s", len, prefix, path);
However, passing a NULL pointer to the printf(3) family of functions
to format it with %s conversion, even with the precision set to 0,
i.e.
xstrfmt("%.*s", 0, NULL)
yields undefined results, at least on some platforms.
Avoid this problem by substituting prefix with "" when len==0, as
prefix can legally be NULL in that case. This would mimick the
intent of the original code better.
Reported-by: Tom G. Christensen <tgc@jupiterrise.com>
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Code clean-up.
* ew/send-email-drop-data-dumper:
send-email: do not load Data::Dumper
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We never used Data::Dumper in this script. The only reference
of it was always commented out and removed over a decade ago in
commit 4bc87a28be020a6bf7387161c65ea3d8e4a0228b
("send-email: Change from Mail::Sendmail to Net::SMTP")
Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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On Cygwin, object creation uses the "create a temporary and then
rename it to the final name" pattern, not "create a temporary,
hardlink it to the final name and then unlink the temporary"
pattern.
This is necessary to use Git on Windows shared directories, and is
already enabled for the MinGW and plain Windows builds. It also
has been used in Cygwin packaged versions of Git for quite a while.
See http://thread.gmane.org/gmane.comp.version-control.git/291853
($gmane/275680, $gmane/291853).
* ad/cygwin-wants-rename:
config.mak.uname: Cygwin needs OBJECT_CREATION_USES_RENAMES
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