rsmith added a subscriber: rsmith.
================
Comment at: lib/AST/ItaniumMangle.cpp:2060-2062
@@ -2058,2 +2059,5 @@
void CXXNameMangler::mangleType(const FunctionNoProtoType *T) {
- llvm_unreachable("Can't mangle K&R function prototypes");
+ // Function types without prototypes can arise when mangling a function type
+ // within an overloadable function in C. We mangle these as we do a function
+ // with an empty variadic argument list in C++.
+ Out << 'F';
----------------
This seems like a suboptimal mangling; a no-prototype function type is not
compatible with a varargs function type, and in particular may have a different
calling convention across a C/C++ ABI boundary. How about instead mangling this
as the absence of any parameter types? (That is, drop the `z`, and mangle your
testcase below as just `_Z1fPFvzE`.) libc++abi already demangles that as
desired (but libstdc++ considers it an invalid mangled name).
http://reviews.llvm.org/D11848
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