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ld: warning: ignoring file ../../../source/cppclient/client/lib/libbid.a, building for macOS-x86_64 but attempting to link with file built for unknown-unsupported file format ( 0x21 0x3C 0x61 0x72 0x63 0x68 0x3E 0x0A 0x2F 0x20 0x20 0x20 0x20 0x20 0x20 0x20 )

Undefined symbols for architecture x86_64:

? "___bid64_from_string", referenced from:

? ? ? stringToDecimal(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) in EDecoder-5533e2.o

? ? ? stringToDecimal(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) in TestCppClient-3ecfd4.o

? "___bid64_to_string", referenced from:

? ? ? decimalToString(unsigned long long) in EClient-244261.o

? ? ? decimalToString(unsigned long long) in TestCppClient-3ecfd4.o

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

I guess it's because you use 000, which if I remember well require that you call by reference.
Try 100

I use
Look at the readme and bid_conf.h
Makefile does generate a bunch of variety of lib to deal with various implementation and calling convention.

Things like
First digit require that you do use calling by reference. 100 is by value etc ...
Second digit is rounding options.
Third is about a global config for some implementation definition of exception.

I think I use 100blibbid
I use "by value" because the hidden type is 64 bits, which is same size as a ptr (64 bit cpu), it help (marginally) compilers to optimize procedure.

so either you learn the naming convention of the lib(s) you need,
or workaround you directly put the source file of the "Decimal" lib in your IBKR lib project compile and debug to see if it fits your calling convention.
There are only a dozen .c files needed. Not pretty but allow easier debug of it.