fuzz: banman identical branches compiler warning #21247

compiling master, I get the following warning:

In file included from test/fuzz/banman.cpp:10:
./test/fuzz/util.h: In instantiation of ‘void CallOneOf(FuzzedDataProvider&, Callables ...) [with Callables = {banman_fuzz_target(FuzzBufferType)::<lambda()>, banman_fuzz_target(FuzzBufferType)::<lambda()>, banman_fuzz_target(FuzzBufferType)::<lambda()>, banman_fuzz_target(FuzzBufferType)::<lambda()>, banman_fuzz_target(FuzzBufferType)::<lambda()>, banman_fuzz_target(FuzzBufferType)::<lambda()>, banman_fuzz_target(FuzzBufferType)::<lambda()>, banman_fuzz_target(FuzzBufferType)::<lambda()>, banman_fuzz_target(FuzzBufferType)::<lambda()>, banman_fuzz_target(FuzzBufferType)::<lambda()>, banman_fuzz_target(FuzzBufferType)::<lambda()>, banman_fuzz_target(FuzzBufferType)::<lambda()>}]’:
test/fuzz/banman.cpp:77:18:   required from here
./test/fuzz/util.h:48:32: warning: this condition has identical branches [-Wduplicated-branches]
     return ((i++ == call_index ? callables() : void()), ...);
             ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
./test/fuzz/util.h:48:32: warning: this condition has identical branches [-Wduplicated-branches]

Which compiler or OS are you using? What are the steps to reproduce?

Sorry, Forgot to add that information

System: OS: Debian Buster Compiler: GCC 8.3.0

To Reproduce:

• Grab master
• go through compilation process: ./autogen.sh, ./configure, make -jx
• Get identical branches warning while compiling

Looks like a compiler bug. I can reproduce in buster, but not in bullseye

going to upgrade to gcc 10 and report back

Confirming I cannot replicate with GCC 10.2.1