c++ - 将 GTest 集成到我的项目时 gtest-printers.h 出错

Question

我在构建我的项目时遇到以下错误

C:\gtest\gtest-1.6.0\include\gtest/gtest-printers.h(327) : error C2220: warning treated as error - no 'object' file generated
C:\gtest\gtest-1.6.0\include\gtest/gtest-printers.h(376) : see reference to function template instantiation 'void testing::internal::DefaultPrintTo<const void>(testing::internal::IsNotContainer,testing::internal::true_type,T *,std::ostream *)' being compiled
    with
    [
        T=const void
    ]
    C:\gtest\gtest-1.6.0\include\gtest/gtest-printers.h(416) : see reference to function template instantiation 'void testing::internal::PrintTo<To>(const T &,std::ostream *)' being compiled
    with
    [
        To=const void *,
        T=const void *
    ]
C:\gtest\gtest-1.6.0\include\gtest/gtest-printers.h(327) : warning C4826: Conversion from 'const void *' to 'testing::internal::UInt64' is sign-extended. This may cause unexpected runtime behavior.

我已经按如下方式初始化了 InitGoogleTest，

void startGTest()
{

char *option[] = { "test.exe", //it doesn't have meaning, just dummy
               "--gtest_output=xml:gTestResults.xml" };
int argc = 2;

testing::InitGoogleTest(&argc, option);
RUN_ALL_TESTS(); 
}

更多信息，

int main(int argc, char** argv) 
{ 
char *option[] = { "test.exe", //it doesn't have meaning, just dummy
           "--gtest_output=xml:gTestResults.xml" };
int myargc = 2;
testing::InitGoogleTest(&myargc, option);
RUN_ALL_TESTS(); 
getchar(); // keep console window open until Return keystroke
}

也抛出错误，

1>c:\...\gtestfactorial\gtestfactorial\gtestfactorial.cpp(4) : error C2220: warning treated as error - no 'object' file generated

如果编译器设置在项目属性中更改如下，

c/c++ -> 将警告视为错误 -> 否

然后我就可以构建并运行了。

Answer 1

我猜你会收到这个错误，因为你是在 64 位机器上针对 32 位平台进行交叉编译。我也明白了，这正是我正在做的。 documentation从微软说

This warning indicates that the compiler performed sign extension when a 32-bit pointer was cast to a 64-bit variable.

此警告默认情况下处于关闭状态，但 Google 将警告设为错误以确保任何人都可以使用他们的产品进行构建。您可以将其关闭，但 Microsoft 表示，如果在转换指针类型时发生错误，手动禁用符号扩展会更安全。

在我这边，我最终修改了生成错误的代码:

// Disable this code for cross compiling on 32 bits machine
// GTEST_OS_WINDOWS will always be defined when compiling on a Windows machine.
// GTEST_OS_TARGET_PLATFORM is defined by us when running CMake
#if GTEST_OS_WINDOWS && !GTEST_OS_TARGET_PLATFORM
        *os << reinterpret_cast<const void*>(
          reinterpret_cast<internal::UInt64>(p));
#else
        *os << reinterpret_cast<const void*>(
          static_cast<internal::UInt64>(
            reinterpret_cast<internal::UInt32>(p)));
#endif