feat(codegen): pass C-struct records by value as variadic arguments

A variadic EXTERN call is now arranged by clang per call, from the fixed
parameter count and the promoted argument types. C-struct records pass
unchanged in variadic positions, as C11 6.5.2.2p6-7 and 7.16.1.1p2
allow; a record that is not a C struct names the offending field.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/CodeGen/ExpressionGen.cc b/lib/CodeGen/ExpressionGen.cc
index ece055a..d7a4ba7 100644
--- a/lib/CodeGen/ExpressionGen.cc
+++ b/lib/CodeGen/ExpressionGen.cc
@@ -231,9 +231,10 @@ Value *CodeGen::emitCall(const std::string &Callee,
     }
 
     std::vector<Value*> Args;
+    std::vector<const TypeInfo *> Variadic;
     const FuncSig *Sig = resolveCall(Name, ArgExprs, Explicit);
-    if (!Sig || !marshalCallArgs(*Sig, ArgExprs, Line, Args)) return nullptr;
-    return FuncGen->emitCall(*Sig, Args);
+    if (!Sig || !marshalCallArgs(*Sig, ArgExprs, Line, Args, &Variadic)) return nullptr;
+    return FuncGen->emitCall(*Sig, Args, Variadic);
 }
 
 Value *CodeGen::emitAllocationSize(ExprAST *Expr) {