[Issue 3364] New: module with unittest forces entire import chain

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3364

           Summary: module with unittest forces entire import chain
           Product: D
           Version: 2.032
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: dfj1esp02 at sneakemail.com


--- Comment #0 from Sobirari Muhomori <dfj1esp02 at sneakemail.com> 2009-10-05 05:59:32 PDT ---
This bug forces link of any module that indirectly imports any module with
unittest (nearly ANY module) even when I compile without -unittest switch. It
forced me to link in a module working with registry, thus forcing dependency on
extra library advapi32.dll even when I didn't use anything from that module,
this just killed me.

I'm not sure whether this is one bug or two, but together they are fearful.


test.d
---
import test2;

int main()
{
    return 0;
}
---


test2.d
---
module test2;
import test3;
---


test3.d
---
module test3;
import test4;

extern void Foo();

void Goo()
{
    switch("c")
    {
        case "a": break; //comment this line
        case "b": break;
        case "c": break;
        case "d": break;
        default: break;
    }
    Foo();
}
---


test4.d
---
module test4;
unittest
{
}
---

As you see, the main module does basically nothing, everything compiles, but
doesn't link. First I tried this command.

>dmd test.d -oftest.exe
OPTLINK (R) for Win32  Release 8.00.1
Copyright (C) Digital Mars 1989-2004  All rights reserved.
test.obj(test)
 Error 42: Symbol Undefined _D5test212__ModuleInfoZ
--- errorlevel 1

It clearly misses test2 module. But why? test2 is nearly empty, there's nothing
to link from there! Linker doesn't calm down until you compile and link all 4
modules. Then...

>dmd test.d test2.d test3.d test4.d -oftest.exe
OPTLINK (R) for Win32  Release 8.00.1
Copyright (C) Digital Mars 1989-2004  All rights reserved.
test.obj(test)
 Error 42: Symbol Undefined _D5test33FooFZv
--- errorlevel 1

Now comment case "a" line in test3 and it links. I don't understand, why.

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