RFR (M): Enable OpenJDK builds on Windows with MinGW/MSYS

[David Holmes]

On 9/03/2012 5:58 AM, Kelly O'Hair wrote:
> On Mar 8, 2012, at 9:39 AM, Volker Simonis wrote:
>> Please be so kind and also create three bug ids for the corresponding changes.
>
> Created:
> 7152336: Enable builds on Windows with MinGW/MSYS
>
> I think we can use the same CR for all repos. Unless you really want 3 CRs.

You need at least two CRs as hotspot's must be separate: different 
product, release target, build numbers etc.

David

>>
>> The changes are minimal in the sense that I did "just enough" changes to be able
>> to build on Windows with either one of the three Unix emulation environments
>> (MKS, Cygwin, MinGW/MSYS).
>>
>> The main benefits of the new MinGW/MSYS based Windows build are:
>> - no problems with make - one can simply use the make tool which comes with
>>    MinGW/MSYS
>> - with the current MinGW/MSYS version the build is known to succeed, while
>>    the newest Cygwin 1.7.10 version is known to break the OpenJDK build (see:
>>    http://old.nabble.com/Is-anyone-able-to-build-on-Win-7-td33196055.html)
>> - speed - the MinGW/MSYS build times are comparable to the MKS build times
>>    and is at least 50% faster than the Cygwin build times (see numbers below)
>
> That 50% faster is great news.
>
>>
>> The changes are intentionally against the old, "traditional" build system to fix
>> the mentioned Cygwin problems and simplify the Windows build just now. I don't
>> expect any problems in adapting the "new" build infrastructure to MinGW/MSYS as
>> well in a follow-up step.
>>
>> More information on each change can be found in the corresponding webrevs.
>>
>> Timing results for the different build environments (MKS ver. 9.4, Cygwin
>> ver. 1.7.9, MinGW/MSYS 1.0.17) for a full JDK 8 product build on a freshly
>> booted, dual core i7 notebook with 8GB RAM, HDD and 64-bit Windows 7:</p>
>>
>> MKS
>> -- Build times ----------
>> Target all_product_build
>> Start 2012-02-29 19:19:26
>> End   2012-02-29 20:07:44
>> 00:03:10 corba
>> 00:03:44 hotspot
>> 00:00:30 jaxp
>> 00:00:37 jaxws
>> 00:39:39 jdk
>> 00:00:36 langtools
>> 00:48:18 TOTAL
>> -------------------------
>>
>> MinGW/MSYS
>> -- Build times ----------
>> Target all_product_build
>> Start 2012-02-29 18:16:31
>> End   2012-02-29 19:10:59
>> 00:02:57 corba
>> 00:03:04 hotspot
>> 00:00:32 jaxp
>> 00:00:40 jaxws
>> 00:46:36 jdk
>> 00:00:36 langtools
>> 00:54:28 TOTAL
>> -------------------------
>>
>> Cygwin
>> -- Build times ----------
>> Target all_product_build
>> Start 2012-02-29 14:36:50
>> End   2012-02-29 16:05:50
>> 00:05:47 corba
>> 00:03:24 hotspot
>> 00:00:33 jaxp
>> 00:00:43 jaxws
>> 01:17:45 jdk
>> 00:00:39 langtools
>> 01:29:00 TOTAL
>> -------------------------
>>
>
> Excellent details.  Thanks.
>
> I'll definitely work with you to get these changes integrated.
>
>
> -kto
>
>> Regards,
>> Volker
>