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 Relates :   
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GCC4.1 become strogner in regard of some C++ patterns.
One heavily used in Hotspot is
class Foo {
 void Foo::bar() {}
};
which should be written as 
class Foo {
 void bar() {}
};
Also if some external inline function is declared as friend, its body is expected to be already seen. 
 Generally looks like useful cleanup + support for next major GCC release.
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