Odd handling of globals with redefinition as a different kind of symbol

[ibuclaw]

module ice;
extern(C) int _D3ice3funFZi;
int fun() { return 0; }

int main()
{
    return fun();
}

• DMD crashes as it calls *_D3ice3funFZi()
• GDC errors with 'fun' matches conflicting symbols
• LDC renames one of the conflicting symbols to fun.1 (https://compiler-explorer.com/z/s7999chjc)

More subtle, but the same applies to conflicts from pragma(mangle).

pragma(mangle, "ice") int fun() { return 0; }
pragma(mangle, "ice") int var;

int main()
{
    return fun();
}

Where again LDC renames one of the conflicting symbols to ice.1 (https://compiler-explorer.com/z/TfPrjoM3n)

If an importing module were to call fun(), how would it know to reference the .1 symbol?

[kinke]

This is most likely default LLVM behavior; we most likely only check for existing funcs/vars when trying to define a new one of that kind.