[FR] Explicitly disabling linking to benchmark main to support compatibility with statically linking boost test

[mrboojum]

Is your feature request related to a problem? Please describe. The usage of the benchmark main function currently can't be explicitly disabled. This makes it impossible to use both benchmark and boost test in a system because the benchmark main is used during the auto linking.

Describe the solution you'd like The benchmark main function to be surrounded by a safeguard for example like below. This would not interfere with any existing usage and adds minimal complexity. `

ifndef NO_BENCHMARK_MAIN

define BENCHMARK_MAIN()

int main(int argc, char argv) { ... return 0; } int main(int, char)

endif

`

Describe alternatives you've considered Creating an issue with vcpkg, will most likely result in referring to benchmakr/boost Creating an issue with boost test, but the boost test main is actually the one i want to use (not my own main). Adding the above compiler safequards on our systems only.

Additional context Problem reproduceable by creating a setup with vcpkg that uses the boost test main in a program that depends on third library that depends on benchmark library. System: Windows, msvc17.5.3, vpckg tag 2023.02.24 with both benchmark, boost installed Create a test executable that depends on the boost main '

define BOOST_TEST_MODULE test MY_TEST

include <boost/test/unit_test.hpp>

add a test '

[dmah42]

this is not the case. there are two libraries built, one with the main and one without: https://github.com/google/benchmark/blob/main/src/CMakeLists.txt#L67 is where the benchmark_main is built.

perhaps you're depending on the wrong library?

your executable should link against the library without main and not include a BENCHMARK_MAIN statement.

[LebedevRI]

I agree with @dmah42's take.

[LebedevRI]

I'm going to tentatively close this.