Catch2 安装在 ubuntu 20.04 #include <catch2/catch.hpp>

Question

我正在尝试在 ubuntu 20.04 上安装 Catch2。

使用了来自 here 的指令。

我就是这样做的：

$ git clone https://github.com/catchorg/Catch2.git
$ cd Catch2
$ cmake -Bbuild -H. -DBUILD_TESTING=OFF
$ sudo cmake --build build/ --target install

比它告诉我的还好：link for output.

但是：当我尝试编译示例时：// from here

main.cpp

#define CATCH_CONFIG_MAIN  // This tells Catch to provide a main() - only do this in one cpp file
#define CATCH_CONFIG_ENABLE_BENCHMARKING
#include <catch2/catch.hpp>


std::uint64_t Fibonacci(std::uint64_t number) {
    return number < 2 ? 1 : Fibonacci(number - 1) + Fibonacci(number - 2);
}

TEST_CASE("Fibonacci") {
    CHECK(Fibonacci(0) == 1);
    // some more asserts..
    CHECK(Fibonacci(5) == 8);
    // some more asserts..

    // now let's benchmark:
    BENCHMARK("Fibonacci 20") {
        return Fibonacci(20);
    };

    BENCHMARK("Fibonacci 25") {
        return Fibonacci(25);
    };

    BENCHMARK("Fibonacci 30") {
        return Fibonacci(30);
    };

    BENCHMARK("Fibonacci 35") {
        return Fibonacci(35);
    };
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
project(Persistent-world LANGUAGES CXX)
add_executable(${PROJECT_NAME} main.cpp )
find_package(Catch2 REQUIRED)
target_link_libraries(${PROJECT_NAME} Catch2::Catch2)

它输出这样的错误：catch2/catch.hpp: 没有那个文件或目录

提前致谢

Answer 1

问题很简单：克隆 catchorg/Catch2 现在默认为您提供 v3 分支，其工作方式不同。最重要的变化是它不再是单一的header，catch2/catch.hpp header不再存在。

您可以在配置和安装构建之前切换到 v2 分支，或者调整您的代码以适应 v3 中的更改，starting with this documentation on v2 -> v3 migration。

要获得默认的主要目标，link 反对 Catch2::Catch2WithMain 目标。

Answer 2

管理员帮助了我。

赶上 v3。我需要：

cmake_minimum_required(VERSION 3.5)
project(Catch2 LANGUAGES CXX)
add_executable(${PROJECT_NAME} main.cpp )
find_package(Catch2)
target_link_libraries(${PROJECT_NAME} Catch2::Catch2WithMain)

如果你只是 link 反对 Catch2::Catch2，你将不会获得默认的 main 并且必须编写你自己的，并且你自己的 main 需要调用测试。参见例如that

根据我的理解，main 应该是这样的：

#define CATCH_CONFIG_MAIN  // This tells Catch to provide a main() - only do this in one cpp file
#define CATCH_CONFIG_ENABLE_BENCHMARKING
#include <catch2/catch_all.hpp>

std::uint64_t Fibonacci(std::uint64_t number) {
    return number < 2 ? 1 : Fibonacci(number - 1) + Fibonacci(number - 2);
}

TEST_CASE("Fibonacci") {
    CHECK(Fibonacci(0) == 1);
    // some more asserts..
    CHECK(Fibonacci(5) == 8);
    // some more asserts..

    // now let's benchmark:
    BENCHMARK("Fibonacci 20") {
        return Fibonacci(20);
    };

    BENCHMARK("Fibonacci 25") {
        return Fibonacci(25);
    };

    BENCHMARK("Fibonacci 30") {
        return Fibonacci(30);
    };

    BENCHMARK("Fibonacci 35") {
        return Fibonacci(35);
    };
}


int main( int argc, char* argv[] )
{
  Catch::Session session; // There must be exactly one instance

  // writing to session.configData() here sets defaults
  // this is the preferred way to set them

  int returnCode = session.applyCommandLine( argc, argv );
  if( returnCode != 0 ) // Indicates a command line error
        return returnCode;

  // writing to session.configData() or session.Config() here
  // overrides command line args
  // only do this if you know you need to

  int numFailed = session.run();

  // numFailed is clamped to 255 as some unices only use the lower 8 bits.
  // This clamping has already been applied, so just return it here
  // You can also do any post run clean-up here
  return numFailed;
}

Catch2 安装在 ubuntu 20.04 #include <catch2/catch.hpp>

Catch2 installation on ubuntu 20.04 #include <catch2/catch.hpp>

c++

cmake

catch2