[BUG] Invoking executable without args gives regex error

Describe the bug When I run the following benchmark setup I always see the message Failed to match any benchmarks against regex: . when I invoke the executable (giving --help causes a segfault

System Which OS, compiler, and compiler version are you using:

• OS: Debian 10 for WSL2
• Compiler and version: gcc 8.3

To reproduce Steps to reproduce the behavior:

1. Create a new directory
2. Place this CMakeLists.txt in that directory:

cmake_minimum_required(VERSION 3.14)
project(my_project)

set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED YES)

include(FetchContent)

set(BENCHMARK_ENABLE_TESTING off)

FetchContent_Declare(
  googletest
    GIT_REPOSITORY https://github.com/google/googletest.git
    GIT_TAG release-1.12.0)

FetchContent_Declare(
  googlebenchmark
    GIT_REPOSITORY https://github.com/google/benchmark.git
    GIT_TAG v1.7.0)

FetchContent_MakeAvailable(
  googletest
  googlebenchmark)

find_package(OpenMP)

add_library(
  libbench
  bench.cpp)

target_link_libraries(
  libbench
  PRIVATE
    benchmark::benchmark
    pthread
    OpenMP::OpenMP_CXX)

add_executable(bench /dev/null)
target_link_libraries(
  bench
    PRIVATE
      libbench
      benchmark::benchmark_main
      OpenMP::OpenMP_CXX)

3. Use this .cpp file
   • or write your own as far as I can tell it doesn't matter
   • unsure if all these headers matter but I've left them in case they do

#include <iostream>
#include <string>
#include <unordered_map>
#include <vector>
#include <fcntl.h>
#include <unistd.h>
#include <sstream>
#include <string>
#include <benchmark/benchmark.h>
#include <vector>
#include <random>
#include <iostream>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <mutex>
#include <omp.h>
#include <array>
#include <memory>

static void BM_vector_push_back(benchmark::State& state) {
  for (auto _ : state) {
    std::vector<int> v;
    v.reserve(1);
    benchmark::DoNotOptimize(v.data()); // Allow v.data() to be clobbered.
    v.push_back(42);
    benchmark::ClobberMemory(); // Force 42 to be written to memory.
  }
}

BENCHMARK(BM_vector_push_back);

4. cmake -DCMAKE_BUILD_TYPE=Release -S . -B build
5. cmake --build build -- -j8
6. ./build/bench
7. See error, Step 8 should've run the BM_vector_push_back test but instead it says Failed to match any benchmarks against regex: . and fails.

BONUS: 8. if you run build/bench --help you'll see a segmentation fault

Expected behavior I expect all benchmarks in the cpp file to have been run. (in this case BM_vector_push_back) Additionally I expected command line argument parsing to function correctly

Screenshots If applicable, add screenshots to help explain your problem.

Additional context The project where I noticed this problem previously used gcc directly and referred to artifacts that were created manually. I want to use cmake's FetchContent in that project instead this.