Question

我们有以下法典:

#if !defined(__cplusplus)
#  error This file should be compiled as C++
#endif

#include <stdio.h>
#include <string>

//#define USE_CXX_CLASS
#ifdef USE_CXX_CLASS
class SomeClass
{
public:
    SomeClass() {}
    ~SomeClass() {}
    std::string GetSomeString()
    {
        // case #1
    }
};
#endif // USE_CXX_CLASS

int foo()
{
    // case #2
}

int
main (int argc, char *argv[])
{
    (void)argc;
    (void)argv;
#ifdef USE_CXX_CLASS
    SomeClass someInstance;
    someInstance.GetSomeString();
#endif // USE_CXX_CLASS
    foo();
    return 0;
}

并相信,将汇编C++编(而不是C组编)的版本4.2.1,其中可选择<代码>-Wreturn-type-Werror=return-type。如果将上述代码汇编成册,则不必首先填写/#define USE_CXX_CLASS。页: 1

.../gcc-4.2.1/bin/g++   -g    -fPIC -Wreturn-type -Werror=return-type    test.cpp -c -o test.o
test.cpp: In function  int foo() :
test.cpp:26: warning: control reaches end of non-void function

但是,如果<代码>/#define USE_CXX_CLASS行不通,则警告is。 a. 被视为错误:

.../gcc-4.2.1/bin/g++   -g    -fPIC -Wreturn-type -Werror=return-type    test.cpp -c -o test.o
test.cpp: In member function  std::string SomeClass::GetSomeString() :
test.cpp:18: error: no return statement in function returning non-void [-Wreturn-type]
gmake: *** [test.o] Error 1

是的,一个是非成员的职能(案例2),另一个是C++职能(案例1)。海事组织,这不应成为问题。我希望这两种条件都被视为错误,我不想在此刻添加<代码>-Werror或-Wall(或许会以后这样做),但这不属于这一问题的范围。

我的分点是:

Is there some GCC switch that I am missing that should work? (No I do not want to use #pragma s.)
Is this a bug that has been addressed in a more recent version of GCC?

For reference, I have already poured through other similar questions already, including the following:

Answer 1

它是固定的,与<代码>g++良好。 9.3 :成员职能和自由职能均作为错误对待,编号为<>-Wall-Werror=return-type。

Answer 2

I do see an error even w/o the USE_CXX_CLASS flag. i.e. g++ is consistent with the error for both class member functions and non member functions. g++ (GCC) 4.4.3 20100127 (Red Hat 4.4.3-4)

Answer 3

在我看来,你所需要的是一把手脚包。

Name it something like gcc-wrapper and g++-wrapper.
In your Makefile set CC and CXX to the wrappers.
Have the wrapper invoke GCC and pipe its output to another program which will search for your desired warning strings.
Have the search program exit with an error when it finds the warning.

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