RFR(S): 8022177: Windows/MSYS builds broken

Erik Joelsson erik.joelsson at oracle.com
Wed Aug 6 12:50:14 UTC 2014

Here is a fix for the incremental build problem, together with Volker's 
original patch. I would suggest we push this in one go. Just need 
another reviewer to take a look at it first.

Volker, please see if this works for you too. For me, if I ran make a 
second time, the build would fail without it.



On 2014-08-06 12:39, Erik Joelsson wrote:
> I discovered another problem for msys use in 
> make/common/NativeCompilation.gmk. The logic that rewrites the output 
> from "cl.exe -showIncludes" into makefile dependencies assumes cygwin. 
> This will need fixing to support incremental builds on msys.
> /Erik
> On 2014-08-06 11:36, Erik Joelsson wrote:
>> I gave msys another shot and managed to get it running on my laptop, 
>> even with mintty so it's not driving me nuts trying to interact with 
>> it. With your patch I managed to get through configure. When 
>> building, it seems make just stops after a bit in langtools however, 
>> hogging one full cpu core, at least at default concurrency setting 
>> (which is 4 on my machine). Running with JOBS=1 seems to work better.
>> Are you having the same problems, only being able to build without 
>> concurrency?
>> /Erik
>> On 2014-08-06 11:01, Erik Joelsson wrote:
>>> Hello Volker,
>>> The changes seem reasonable to me, consider them reviewed. I can 
>>> make the push if you like.
>>> On msys, I would really like to be able to test this myself, but I 
>>> find it hard to get a proper environment setup. Can you point me to 
>>> a good guide on what I need to do?
>>> /Erik
>>> On 2014-08-05 20:26, Volker Simonis wrote:
>>>> Hi,
>>>> could somebody please review these straightforward changes which fix
>>>> the MinGW7MSYS build on Windows:
>>>> http://cr.openjdk.java.net/~simonis/webrevs/8022177/
>>>> https://bugs.openjdk.java.net/browse/JDK-8022177
>>>> The details of the change can be found below and in the webrev. I
>>>> think I need a sponsor for this change because it requires the
>>>> re-generation of generated-configure files (closed and open).
>>>> I also want to mention that we at SAP are using the MinGW/MSYS build
>>>> on Windows since more than a year for all our Java builds (from 4 to
>>>> 8) on Windows and we're highly committed in keeping this build
>>>> environment alive.
>>>> Independently from this change I also have a general question related
>>>> to the MSYS build:
>>>> During an MSYS build the Windows command shell is usually called 
>>>> like this:
>>>> `cmd //c echo $unix_path`
>>>> As far as I understand, the double slash is needed to prevent MSYS
>>>> from rewriting '/c' to 'c:/' when calling a non-MSYS executable. But
>>>> sometimes (notably in BASIC_MAKE_WINDOWS_SPACE_SAFE_MSYS in
>>>> basic_windows.m4) we call the Windows command shell without a quoted
>>>> forward slash like this:
>>>> new_path=`cmd /c "for %A in (\"$input_path\") do @echo %~sA"
>>>> and I don't understand why this works.
>>>> To complicate things, the MSYS environment contains its own 'cmd'
>>>> shell script in '/usr/bin/cmd' which only redirects to the
>>>> corresponding Windows command shell like so:
>>>> #!/bin/sh
>>>> "$COMSPEC" "$@"
>>>> Unfortunately I didn't succeed in unifying all the calls to 'cmd' to a
>>>> single pattern (i.e. either `cmd //c ...`, or `/usr/bin/cmd /c ...`)
>>>> which would be desirable, because depending on the actual PATH
>>>> settings, `cmd` may either call "/usr/bin/cmd" or
>>>> "C:\Windows\System32\cmd.exe".
>>>> Can anybody shed some light on this topic (i.e. which "cmd" we want to
>>>> call and why we have to quote "/c" differently)?
>>>> Thank you and best regards,
>>>> Volker
>>>> 1. common/autoconf/basics.m4
>>>> - Check for bsdcpio if cpio is not found. Also make the check for cpio
>>>> optional, as suggested in the bug report.
>>>> - Only do the BASIC_CHECK_SRC_PERMS check on Cygwin as it only seems
>>>> to be relavant there and because the stat utility isn't availabel in
>>>> MSYS anyway.
>>>> 2. common/autoconf/basics_windows.m4
>>>> - Same story like on Cygwin: '.bat' and '.cmd' files are not always
>>>> considered executable in MSYS causing which to not find them.
>>>> 3. common/autoconf/flags.m4
>>>> - Use "-WX" option syntax for cl options (instead of "/WX") to prevent
>>>> option rewriting by MSYS.
>>>> 4. toolchain_windows.m4
>>>> - Account for the fact that the MSYS file utility reports different
>>>> file types for Windows DLLs than its Cygwin counterpart.

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