[Bug 270] New: Weird ctor / dtor function names

[via D.gnu]

https://bugzilla.gdcproject.org/show_bug.cgi?id=270

            Bug ID: 270
           Summary: Weird ctor / dtor function names
           Product: GDC
           Version: development
          Hardware: All
                OS: All
            Status: NEW
          Severity: trivial
          Priority: Normal
         Component: gdc
          Assignee: ibuclaw at gdcproject.org
          Reporter: johannespfau at gmail.com

We use get_file_function_name to get the name for the ctor/dtor gate function.
However, the output is kinda weird:

------------------------------------------
module test;
void foo() {}
------------------------------------------
gdc -fdump-tree-original -c test.d

=>
------------------------------------------
_GLOBAL__I__D4test3fooFZv ()
_GLOBAL__D__D4test3fooFZv ()
------------------------------------------

------------------------------------------
module test;
------------------------------------------
gdc -fdump-tree-original -c test.d

=>
------------------------------------------
_GLOBAL__I__D4test12__ModuleInfoZ ()
_GLOBAL__D__D4test12__ModuleInfoZ ()
------------------------------------------

Seems like it just used the name of the first function it can find. Initially I
though this was some kind of incorrectly set flag but it seems to be
intentional?

We could easily produce a unique name using the module mangle instead which
also has the additional benefit that it produces reproducible names (the
symbols are local, so it's not really an ABI issue, but changing names can be
annoying when debugging).

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