_BOOTDIR1 on MS Windows platform

[Kelly O'Hair]

Adding a sanity check warning about J:/ usage would be a nice addition
to this change.

-kto

Jonathan Gibbons wrote:
> Kelly,
> 
> Perhaps "make sanity" on Windows could give a warning about the use
> of network paths, if such is detected.
> 
> -- Jon
> 
> 
> Kelly O'Hair wrote:
>> Sorry I'm so slow in responding to this...
>>
>> The primary reason for the special case on Windows is the unreliability
>> and slowness of the network connections.
>> Builds using a local jdk vs. a J:/ mapped can be 5 hours long when
>> they might normally be 1hr or less. These just come from reports I
>> have gotten over the years, and it's really depends on the Windows
>> machine, the network, etc.
>>
>> Bottom line, builds are always faster and more reliable when all 
>> components
>> are stored on local disk, and this is particularly true on Windows.
>>
>> Having said all that, I ALWAYS set ALT_BOOTDIR to my local copy
>> (and ALT_JDK_IMPORT_PATH too). So I probably would not be impacted
>> by this change, but I bet quite a few people rely on this c:/jdk1.6.0
>> default. With enough warning you might be able to change this.
>>
>> ---
>>
>> I have been recently working on the JavaFX build dependency issues
>> and although it's more ant based, some of the techniques could apply
>> to making OpenJDK builds easier. Unfortunately, there is only 24hrs
>> in a day. :^{
>>
>> -kto
>>
>>
>> Anthony Petrov wrote:
>>> Hello,
>>>
>>> Back in 2007 we already discussed this issue with Kelly, but 
>>> transitioning to Mercurial just stopped the work. So, I would like to 
>>> revive this now.
>>>
>>> Here's a part of the output generated by `grep -r BOOTDIR make/*`:
>>>
>>>> make/common/shared/Defs-solaris.gmk:  _BOOTDIR1  
>>>> =$(SLASH_JAVA)/re/jdk/$(PREVIOUS_JDK_VERSION)/archive/fcs/binaries/$(PLATFORM)-$(ARCH) 
>>>>
>>>> make/common/shared/Defs-solaris.gmk:  _BOOTDIR2  
>>>> =$(USRJDKINSTANCES_PATH)/jdk$(PREVIOUS_JDK_VERSION)
>>>> make/common/shared/Defs-windows.gmk:  _BOOTDIR1  
>>>> =$(_system_drive)/jdk$(PREVIOUS_JDK_VERSION)
>>>> make/common/shared/Defs-windows.gmk:  _BOOTDIR2  
>>>> =$(USRJDKINSTANCES_PATH)/jdk$(PREVIOUS_JDK_VERSION)
>>>> make/common/shared/Defs-linux.gmk:  _BOOTDIR1  
>>>> =$(SLASH_JAVA)/re/jdk/$(PREVIOUS_JDK_VERSION)/archive/fcs/binaries/$(PLATFORM)-$(ARCH) 
>>>>
>>>> make/common/shared/Defs-linux.gmk:  _BOOTDIR2  
>>>> =$(USRJDKINSTANCES_PATH)/jdk$(PREVIOUS_JDK_VERSION)
>>>
>>> One can notice that the _BOOTDIR1 is defined differently on MS 
>>> Windows platform. I would like to propose a change so that its value 
>>> would be the same as on other platforms. The SLASH_JAVA on MS Windows 
>>> equals to the J: drive. So one could setup the same directory tree as 
>>> on Linux/Solaris, use the subst command to make the directory the J: 
>>> drive, and be able to build the jdk w/o specifying the ALT_BOOTDIR 
>>> variable manually.
>>>
>>> Is there any objection to removing the 
>>> $(_system_drive)/jdk$(PREVIOUS_JDK_VERSION) default path?
>>>
>>> -- 
>>> best regards,
>>> Anthony
>