[Mono-dev] mcs patch for preprocessor directive

[Atsushi Eno]

> Here is a patch that contains some preprocessor fixes:
> 
> 	- It didn't report expected location (tiny fix).
> 	- When -langversion:ISO-1 is specified, #pragma directive
> 	  is always checked, even when it is actually disabled
> 	  by #if directive. (Because of this bug, currently
> 	  mscorlib cannot be compiled with csc.)

Oops, I must be saying something wierd ... it is irrelevant to the
build breakage. Here is another one item to be mentioned:

	- Even inside a disabled block, the name of a directive
	  should be checked and be reported as an error if it
	  is wrong.

Thus csc 1.x reports an error at #pragma line inSystem/ConsoleKey.cs
and mcs will become the same. So I should have attached the patch to
fix this.

... Yes it brings back CS3005, but I don't think there would be
another way :|

Atsushi Eno
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