Fixes for sanity-compiler-gcc and detection of linux variant

[Mike Duigou]

On Nov 6 2010, at 07:07 , David Holmes wrote:

>> 6998016: Incorrect ifdef nesting in sane-gcc-compiler rule
>> 
>> http://cr.openjdk.java.net/~mduigou/6998016.0/webrev/
> 
> In Defs-linux.gmk I must be missing something:
> 
> ifneq "$(origin ALT_GCC29_COMPILER_PATH)" "undefined"
> 
> and
> 
> ifdef ALT_GCC29_COMPILER_PATH
> 
> seem completely equivalent. The latter is simpler of course.

That's the conclusion I came to as well after scratching my head for a couple minutes to figure out why $(origin ) was used in this specific case. The change is to minimize future head scratching.

> In Sanity.gmk ... when I reported this problem it was stated that the correct fix was to swap the order of these two lines:
> 
> 1486 ifeq ($(PLATFORM), solaris)
> 1487   ifndef OPENJDK
> 
> Not saying what you have is wrong, just different to what was stated previously.

That organization does make more sense. 

> Also note the comment at 1483 is out of date as it only refers to Solaris.

I've now corrected the comment to make it clear that these sanity tests are about the OJI plugin.

Updated webrev at http://cr.openjdk.java.net/~mduigou/6998016.1/webrev/

Mike