http://d.puremagic.com/issues/show_bug.cgi?id=4767
Summary: dmd generates useless template bloat
Product: D
Version: D1 & D2
Platform: Other
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from [email protected] 2010-08-29 20:36:13 PDT ---
Merely importing a file that contains template can make dmd generate code. This
not only increases compile times, but it also can be the reason for severe exe
bloat: often the linker will pull in completely unrelated modules just to get
symbols for instantiated templates (the bloat is then caused by unrelated
symbols that have been unnecessarily been pulled in).
$ cat a.d
module a;
import b;
$ cat b.d
module b;
struct Bloat(T)
{
void foo() {
}
}
class NotBloat
{
this(Bloat!(uint) x)
{
}
}
$ dmd -c a.d
$ nm a.o|grep Bloat
00000000 W _D1b12__T5BloatTkZ5Bloat3fooMFZv
00000000 V _D1b12__T5BloatTkZ5Bloat6__initZ
00000000 V _D32TypeInfo_S1b12__T5BloatTkZ5Bloat6__initZ
a.d only imports b.d, yet there's this crap in a.o.
Obviously dmd should not generate code in this case.
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