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I am kind of confused about using the _at_ keyword to assign a specific address to a variable.
so for example :
extern xdata char variable _at_ 0x000f;
it fills 3 bytes in xram . can any one explain how is the compiler handling these sequence. Thank you !
The extern keyword is part of the standard.
The __at keyword is not.
So when you combine the two, the combination will not be part of the standard. In this, I agree with Erik. People should not push their luck too much.
Another important thing is that embedded compilers (besides regularly adding non-standard features to better map to the processor and embedded use) are notorious for being less standards-compliant than "PC compilers". This comes for the much smaller customer base. Less people to catch bugs and design oops. But also often less resources to maintain the compiler.
M$ has a way larger budget to keep their compilers updated. And their track record still shows how hard they have had with standards compliance.