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From: "ibuclaw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/110406] d: Wrong code-gen returning POD structs by value
Date: Mon, 26 Jun 2023 20:55:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110406

--- Comment #10 from ibuclaw at gcc dot gnu.org ---
Looking at an ICE in stage2 D compiler for i686-darwin17, I realized that i=
t's
another facet of this issue.

// aggregate.d
import dsymbol;
extern (C++) class AggregateDeclaration : ScopeDsymbol
{
    Visibility visibility;
    override Visibility visible() { return visibility; }
}



// dsymbol.d
struct Visibility
{
    enum Kind { undefined }
    Kind kind;
}
extern(C++) class ScopeDsymbol
{
    Visibility visible();
    Visibility.Kind* visibilities;=20
}


When compiling dsymbol.d, `struct Visibility` is set SImode.  However when
compiling aggregate.d it's instead given BLKmode.  This causes all the
difference in how it is returned.  Any C++ code interfacing with this will
crash due to the mismatch too.=