RFR: 8015377: Support using compiler devkits on Linux

[Tim Bell]

Erik:

> Reminder that this would still like a review.
>

Sorry for the delay.  I finally got a chance to test drive this on a 
Linux build system.

It works.  The changes found the devkit and used it.  Approved...

Tim


> /Erik
>
> On 2013-05-27 10:45, Erik Joelsson wrote:
>>
>>
>> On 2013-05-27 05:22, David Holmes wrote:
>>> Hi Erik,
>>>
>>> Not a full review by any means.
>>>
>>> Looking at libraries.m4, there is some later code:
>>>
>>>  156 # Some of the old makefiles require a setting of OPENWIN_HOME
>>>  157 # Since the X11R6 directory has disappeared on later Linuxes,
>>>  158 # we need to probe for it.
>>>  159 if test "x$OPENJDK_TARGET_OS" = xlinux; then
>>>  160     if test -d "$SYS_ROOT/usr/X11R6"; then
>>>  161         OPENWIN_HOME="$SYS_ROOT/usr/X11R6"
>>>  162     fi
>>>  163     if test -d "$SYS_ROOT/usr/include/X11"; then
>>>  164         OPENWIN_HOME="$SYS_ROOT/usr"
>>>  165     fi
>>>  166 fi
>>>
>>> that looks like it should an if/else similar to the code you 
>>> modified. (Bob Vandette flagged this to me a while ago)
>>>
>> That should be using the same logic as above yes. Fixed.
>>
>> http://cr.openjdk.java.net/~erikj/8015377/webrev.root.02/
>>
>>> Otherwise the existing configure changes look okay. Can't comment on 
>>> the devkit package stuff.
>>>
>> Thanks! Not sure about committing the devikt creator scripts, but 
>> think they should be open in some way. They are quite messy, even if 
>> I've tried cleaning them up.
>>
>> /Erik
>>> Thanks,
>>> David
>>>
>>> On 24/05/2013 10:40 PM, Erik Joelsson wrote:
>>>> Official compiler and OS versions for building OracleJDK are being
>>>> evaluated. A wanted feature is to be able to separate compiler version
>>>> from OS version for the linux build, as is already the case for all
>>>> other platforms. This could be achieved by creating portable self
>>>> contained compiler bundles. Support for such devkits already exist in
>>>> the OpenJDK configure scripts, but since it's rarely used, there are a
>>>> couple of issues with it that needs to be fixed.
>>>>
>>>> This patch fixes those issues and also provides makefiles that can be
>>>> used to replicate the devkits being evaluated. More information on how
>>>> to build them can be found in the comments in
>>>> common/makefiles/devkit/Makefile. I don't expect many will try 
>>>> this, but
>>>> the information should be open. These makefiles could be left for 
>>>> later.
>>>> The configure changes are what we need now.
>>>>
>>>> A devkit like this solves several problems:
>>>> 1. We need to build on an older OS to create binaries compatible with
>>>> both old and new versions of OSes, but we also want to use modern
>>>> compilers not likely to be available on an older OS.
>>>> 2. For developers it's easier to get a working build environment on a
>>>> new system since most dependencies will be in the devkit. It also 
>>>> makes
>>>> it easier to use the official compiler and libraries for developer 
>>>> builds.
>>>> 3. Support for cross compilation is included. The x86_64 package
>>>> supports the -m32 flag and will function correctly when the jdk
>>>> configure script is fed with --with-target-bits=32. The i686 package
>>>> contains a full x86_64 cross toolchain.
>>>>
>>>> http://cr.openjdk.java.net/~erikj/8015377/webrev.root.01/
>>>>
>>>> Binary bundles will be made available internally soon.
>>>>
>>>> /Erik