http://d.puremagic.com/issues/show_bug.cgi?id=4377

           Summary: Support __gshared for easier D 2 compatibility
           Product: D
           Version: D1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: torhu@yahoo.com


--- Comment #0 from torhu@yahoo.com 2010-06-23 16:16:31 PDT ---
It be would nice if D 1.x compilers accepted the __gshared keyword.  The need for this comes up a lot when trying to make code that is ported from C work with both D 1 and D 2.  Or even Java, this is an issue for DWT too.

One typical example that won't work in D 2 is this:

---
int x = 1;
int y = 2;

struct S { int* ptr; }

S[2] s = [{ &x }, { &y }];
---

Because the addresses of x and y are not known at link time in D 2, they are not accepted in static initializers.

x and y would typically be structs or function pointers, and the whole thing would be a lot more complex than this example. And there would be a whole lot of this stuff in the file too.  Slapping a "__gshared:" on top of the file is an easy fix, but then it won't compile with D 1.x compilers.

I know there are several ways to make this work, but none of them are that nice.  Using lots of big string mixins or moving all the initializers into module constructors?  Ugh.

Since __gshared starts with two underscores, it shouldn't conflict with user code either.

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