dmd/compiler/test/compilable/dtoh_mangling.d

/++
REQUIRED_ARGS: -HC=verbose
TEST_OUTPUT:
---
// Automatically generated by Digital Mars D Compiler v$n$

#pragma once

#include <assert.h>
#include <math.h>
#include <stddef.h>
#include <stdint.h>

extern "C" int32_t freeC();

// Ignored function dtoh_mangling.bar because C++ doesn't support explicit mangling
struct Data final
{
    // Ignored function dtoh_mangling.Data.foo because of linkage
    // Ignored function dtoh_mangling.Data.bar because C++ doesn't support explicit mangling
    Data()
    {
    }
};

extern void accept(Data data);

extern "C" void hasDefault(int32_t i = freeC());

extern "C" void hasDefaultMember(int32_t i = memberC());

extern "C" int32_t someVarC;

// Ignored variable dtoh_mangling.var2 because C++ doesn't support explicit mangling
struct HasMangleMember final
{
    int32_t someAttrC;
    int32_t someAttrCpp;
    void hasDefaultVar(int32_t i = someAttrC);
    HasMangleMember() :
        someAttrC(),
        someAttrCpp()
    {
    }
    HasMangleMember(int32_t someAttrC, int32_t someAttrCpp = 0) :
        someAttrC(someAttrC),
        someAttrCpp(someAttrCpp)
        {}
};

extern "C" void hasDefaultVar(int32_t i = someVarC);
---
++/

extern(C):

pragma(mangle, "freeC")
int foo() { return 0; }

pragma(mangle, "freeCpp")
extern (C++) void bar() {}

pragma(mangle, "Aggregate")
struct Data
{
    pragma(mangle, "memberC")
    static int foo() { return 0; }

    pragma(mangle, "memberCpp")
    extern (C++) void bar() {}
}

extern(C++)
void accept(Data data) {}

void hasDefault(int i = foo()) {}

void hasDefaultMember(int i = Data.foo()) {}

pragma(mangle, "someVarC")
__gshared int var;

pragma(mangle, "someVarCpp")
extern(C++) __gshared int var2;

struct HasMangleMember
{
    pragma(mangle, "someAttrC")
    int var;

    pragma(mangle, "someAttrCpp")
    extern(C++) int var2;

    extern(C++) void hasDefaultVar(int i = var) {}
}

void hasDefaultVar(int i = var) {}