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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/105169] Compiling C++ code with
 -fpatchable-function-entry=16,14 results in references to discarded sections
Date: Wed, 06 Apr 2022 09:53:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105169

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #2)
> Confirmed, a bit reduced test-case:
>=20
> $ cat 1.ii
> struct WinsockInterfaceClass {
>   virtual int Get_Protocol() { return 0; }
> } PacketTransport;
>=20
> $ cat 2.ii
> struct WinsockInterfaceClass {
>   WinsockInterfaceClass();
>   virtual void Set_Broadcast_Address() {}
>   virtual int Get_Protocol() { return 0; }
> };

Note this is a ODR violation, so better match up both WinsockInterfaceClass
types.

> WinsockInterfaceClass::WinsockInterfaceClass() {}
>=20
> int main()
> {
>   return 0;
> }
>=20
> $ g++ 1.ii 2.ii -fpatchable-function-entry=3D1 -O2
> `.text._ZN21WinsockInterfaceClass12Get_ProtocolEv' referenced in section
> `__patchable_function_entries' of /tmp/cc6P6bkZ.o: defined in discarded
> section
> `.text.
> _ZN21WinsockInterfaceClass12Get_ProtocolEv[_ZN21WinsockInterfaceClass12Ge=
t_Pr
> otocolEv]' of /tmp/cc6P6bkZ.o
> collect2: error: ld returned 1 exit status
>=20
> $ g++ 1.ii 2.ii -fpatchable-function-entry=3D1 -O2 -fuse-ld=3Dgold
> /tmp/ccCrCzcR.o(__patchable_function_entries+0x8): error: relocation refe=
rs
> to local symbol "" [4], which is defined in a discarded section
>   section group signature: "_ZN21WinsockInterfaceClass12Get_ProtocolEv"
>   prevailing definition is from /tmp/ccH1NIH4.o
> collect2: error: ld returned 1 exit status=