使用 CMake 链接到窗口上的静态库时出现问题

LS，

我正在尝试构建一个静态和动态库，可用于与动态和静态链接。我希望该库能够在尽可能多的平台上运行，无论使用哪种编译器。为了构建库和一些测试程序，我使用 CMake 分别使用 g++ 和 MSVC++ 在 Linux 和 Windows 上构建库 EEG。

在 Linux 上，动态库和静态库似乎都像我怀疑的那样工作，在 Windows 上，.dll 似乎完美链接，我的测试程序运行。但是，使用静态库的程序会抱怨链接错误。我真的很想念我做错了什么，它可能在我的CMakeLists.txt中，但也在我的库设置中。下面我制作了一个最小的程序，它使用我的库来演示我遇到的问题。该库由两个C++文件组成，一个导出C++文件中代码的 C API，一个使用 C API 的C++程序，最后是一个 CMakeList.txt它可以生成除使用静态库的程序之外的所有程序。这一切都产生了一个美妙的"你好，世界！

我知道我展示了很多代码，但至少它是一个最小的项目，展示了我在链接到静态库时遇到的问题。我希望有人好心看看这个项目，并解释我做错了什么。

亲切问候

赫特佩凡

C++文件PriCpp.cpp

#include "PriCpp.h"
using namespace std;
string PriMessageBuilder::message() const {
    return "Hello, World!";
}

标题 PriCpp.h

#ifndef PRICPP_H
#define PRICPP_H
#include <string>
class PriMessageBuilder{
public:
    std::string message() const;
};
#endif

C API 是：Mycapi.h

#ifndef MYCAPI_H
#define MYCAPI_H
#include "builder_export.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef struct {} message_builder;
BUILDER_EXPORT message_builder* message_builder_new();
BUILDER_EXPORT void             message_builder_destroy(
                                        message_builder* builder
                                        );
BUILDER_EXPORT char*            message_builder_message(
                                        message_builder* builder
                                        );
#ifdef __cplusplus
}
#endif
#endif

mycapi.cpp是：

#include "mycapi.h"
#include "PriCpp.h"
#include <cstring>
#include <cstdlib>
message_builder* message_builder_new() {
    PriMessageBuilder* ret = NULL;
    try {
        ret = new PriMessageBuilder();
    } catch (...) {
    }
    return reinterpret_cast<message_builder*>(ret);
}
void message_builder_destroy(message_builder* builder)
{
    PriMessageBuilder* b = reinterpret_cast<PriMessageBuilder*>(builder);
    delete b;
}
char* message_builder_message(message_builder* builder)
{
    PriMessageBuilder* b = reinterpret_cast<PriMessageBuilder*>(builder);
    return strdup(b->message().c_str());
}

我与上面的库结合使用的程序。程序.cpp

#include <iostream>
#include <cstdlib>
#include <string>
#include "mycapi.h"
using namespace std;
class MessageBuilder {
public:
    MessageBuilder() : m_builder(message_builder_new()) {
    }
    ~MessageBuilder() {
        message_builder_destroy(m_builder);
    }
    string MessageBuilder::message() {
        char* msg = message_builder_message(m_builder);
        string m(msg);
        free (msg);
        return m;
    }
private:
    message_builder* m_builder;
};
int main(int, char**) {
    MessageBuilder m;
    cout << m.message() << endl;
    return 0;
}

最后是CMakeLists.txt用于构建makefile或Visual Studio解决方案

#setting up project
cmake_minimum_required(VERSION 2.6)
project(libbuilder CXX) 
include (GenerateExportHeader)
include_directories("${PROJECT_BINARY_DIR}")
#creating library
add_library(builder SHARED PriCpp.cpp PriCpp.h mycapi.cpp mycapi.h)
add_library(builder-static STATIC PriCpp.cpp PriCpp.h mycapi.cpp mycapi.h)
generate_export_header(builder)
set_target_properties(builder PROPERTIES COMPILE_FLAGS -DBUILD_BUILDER_SHARED)
set_target_properties(builder-static PROPERTIES COMPILE_FLAGS -DBUILDER_STATIC_DEFINE)
#creating programs
add_executable(program program.cpp)
add_executable(program-static program.cpp)
target_link_libraries(program builder)
target_link_libraries(program-static builder-static)

如果我构建解决方案，我会收到以下链接器错误：

1>program.obj : error LNK2019: unresolved external symbol __imp__message_builder_new referenced in function "public: __thiscall MessageBuilder::MessageBuilder(void)" (??0MessageBuilder@@QAE@XZ)
1>program.obj : error LNK2019: unresolved external symbol __imp__message_builder_destroy referenced in function "public: __thiscall MessageBuilder::~MessageBuilder(void)" (??1MessageBuilder@@QAE@XZ)
1>program.obj : error LNK2019: unresolved external symbol __imp__message_builder_message referenced in function "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall MessageBuilder::message(void)" (?message@MessageBuilder@@QAE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ)
1>K:duijn119programmingcmakestaticsharedlibbuildDebugprogram-static.exe : fatal error LNK1120: 3 unresolved externals

CMake 生成的包含标头为：

#ifndef BUILDER_EXPORT_H
#define BUILDER_EXPORT_H
#ifdef BUILDER_STATIC_DEFINE
#  define BUILDER_EXPORT
#  define BUILDER_NO_EXPORT
#else
#  ifndef BUILDER_EXPORT
#    ifdef builder_EXPORTS
        /* We are building this library */
#      define BUILDER_EXPORT __declspec(dllexport)
#    else
        /* We are using this library */
#      define BUILDER_EXPORT __declspec(dllimport)
#    endif
#  endif
#  ifndef BUILDER_NO_EXPORT
#    define BUILDER_NO_EXPORT 
#  endif
#endif
#ifndef BUILDER_DEPRECATED
#  define BUILDER_DEPRECATED __declspec(deprecated)
#endif
#ifndef BUILDER_DEPRECATED_EXPORT
#  define BUILDER_DEPRECATED_EXPORT BUILDER_EXPORT BUILDER_DEPRECATED
#endif
#ifndef BUILDER_DEPRECATED_NO_EXPORT
#  define BUILDER_DEPRECATED_NO_EXPORT BUILDER_NO_EXPORT BUILDER_DEPRECATED
#endif
#define DEFINE_NO_DEPRECATED 0
#if DEFINE_NO_DEPRECATED
# define BUILDER_NO_DEPRECATED
#endif
#endif

set_target_properties(program-static PROPERTIES COMPILE_DEFINITIONS BUILDER_STATIC_DEFINE)