[Issue 14662] New: __FILE__ template parameter becomes relative just by changing compilation directory

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14662

          Issue ID: 14662
           Summary: __FILE__ template parameter becomes relative just by
                    changing compilation directory
           Product: D
           Version: D2
          Hardware: x86
                OS: All
            Status: NEW
          Severity: major
          Priority: P1
         Component: DMD
          Assignee: nobody at puremagic.com
          Reporter: timothee.cour2 at gmail.com

I was getting quite obscure linker errors in a project. I reduced it to this:
__FILE__ generates sometimes relative paths even though all files and '-I'
paths are given as absolute paths, depending on the directory in which 'dmd' is
launched.



----------------------------
/mydir/fun1.d:
import fun2;
void test(){ test2(); }
/mydir/fun2.d:
void test2(string file=__FILE__)(){
  if(false) test2();
}

-----------------
cd /mydir/
dmd -of/tmp/fun1.o -c -I/mydir/ /mydir/fun1.d && nm /tmp/fun1.o |ddemangle
|grep test2
S pure nothrow @nogc @safe void fun2.test2!("/mydir/fun1.d").test2()
S pure nothrow @nogc @safe void fun2.test2!("fun2.d").test2()
-----------------
cd / #or anywhere else

dmd -of/tmp/fun1.o -c -I/mydir/ /mydir/fun1.d && nm /tmp/fun1.o |ddemangle
|grep test2
S pure nothrow @nogc @safe void fun2.test2!("/mydir/fun1.d").test2()
S pure nothrow @nogc @safe void fun2.test2!("/mydir/fun1.d").test2()

The difference is: 'test2!("/mydir/fun1.d")' vs 'test2!("fun2.d")'

I believe 'test2!("fun2.d")' is wrong.

Maybe related:
http://www.digitalmars.com/d/archives/digitalmars/D/learn/exclude_current_directory_from_search_path_in_dmd_69919.html
"exclude current directory from search path in dmd ?" (which i asked on the
forum but didn't get answer to)

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