I'm trying to wrap a C++ library and have reduced my problem case
to the code below. I get a linker error due to different name
mangling (this is on Linux):
main.d:(.text._Dmain+0x13): undefined reference to
`_ZN3ns13ns212createStructERN3ns17OptionsE'
The C++ object file has instead a symbol called
_ZN3ns13ns212createStructERNS_7OptionsE. To make matters worse
and me more confused, according to https://demangler.com, they
both demangle to the same thing:
`ns1::ns2::createStruct(ns1::Options&)`.
If you're wondering why there's two D files it's because trying
to do:
extern(C++, ns1) {... }
extern(C++, ns1.ns2) {...}
doesn't compile since there would be two D versions of ns1, which
is... mildly annoying.
I even took `const` off of the parameter in case that was the
problem but clearly not.
Atila
impl.cpp:
namespace ns1 {
struct Options {
};
struct Struct {
};
namespace ns2 {
ns1::Struct* createStruct(Options&) {
return nullptr;
}
}
}
header.d:
extern(C++, ns1) {
struct Options {
}
struct Struct {
}
}
main.d:
extern(C++, ns1.ns2) {
import header;
Struct* createStruct(ref Options);
}
void main() {
import header;
Options options;
auto s = createStruct(options);
}
