c++에서 배열의 초기화 문제입니다.

file : my.h

enum MyType {
    MY_TYPE_UNDEFINED,
    MY_TYPE_INTEGER,
    MY_TYPE_BOOL,
    MY_TYPE_STRING,
    MY_TYPE_FLOAT
};

union UValue {
    UValue(void) {
        m_svalue = NULL;
    }
    UValue(int ivalue) {
        m_ivalue = ivalue;
    }
    UValue(bool bvalue) {
        m_bvalue = bvalue;
    }
    UValue(char* svalue) {
        m_svalue = svalue;
    }
    UValue(float fvalue) {
        m_fvalue = fvalue;
    }
    
    int     m_ivalue;
    bool    m_bvalue;
    char*   m_svalue;
    float   m_fvalue;
};

struct SMyVariable {
    const int       m_iName;
    const char*     m_sName;
    MyType          m_type;
    UValue          m_defaultValue;
};

file : main.c

#include <stdio.h>
#include "my.h"

enum {
    MY_INT_NAME1,
    MY_INT_NAME2,
    MY_INT_NAME3,
    MY_INT_NAME4,
};

static SMyVariable myVariables[] = {
    { MY_INT_NAME1, "name1", MY_TYPE_BOOL,    true, },
    { MY_INT_NAME2, "name2", MY_TYPE_INTEGER, (int)1, },
    { MY_INT_NAME3, "name3", MY_TYPE_STRING,  "", },
    { MY_INT_NAME4, "name4", MY_TYPE_FLOAT,   (float)1.0, },
};

int main(int argc, char *argv[])
{
    printf("Hello World!\n");
    printf("%d\n", myVariables[0].m_iName);
    return 0;
}

gcc에서는 문제없이 컴파일이 되고 실행이 됩니다.
그런데 VC++에서는 아래와 같은 에러가 발생하면서 컴파일이 중지됩니다.

C:\work\ArrTest\main.cpp(12) : error C2440: 'initializing' : cannot convert from 'enum ' to 'struct SMyVariable'
        No constructor could take the source type, or constructor overload resolution was ambiguous
C:\work\ArrTest\main.cpp(12) : error C2440: 'initializing' : cannot convert from 'char [6]' to 'struct SMyVariable'
        No constructor could take the source type, or constructor overload resolution was ambiguous
C:\work\ArrTest\main.cpp(12) : error C2440: 'initializing' : cannot convert from 'enum MyType' to 'struct SMyVariable'
        No constructor could take the source type, or constructor overload resolution was ambiguous
C:\work\ArrTest\main.cpp(12) : error C2440: 'initializing' : cannot convert from 'const bool' to 'struct SMyVariable'
        No constructor could take the source type, or constructor overload resolution was ambiguous
C:\work\ArrTest\main.cpp(13) : error C2440: 'initializing' : cannot convert from 'enum ' to 'struct SMyVariable'
        No constructor could take the source type, or constructor overload resolution was ambiguous
C:\work\ArrTest\main.cpp(13) : error C2440: 'initializing' : cannot convert from 'char [6]' to 'struct SMyVariable'
        No constructor could take the source type, or constructor overload resolution was ambiguous
......................
......................
C:\work\ArrTest\main.cpp(15) : error C2440: 'initializing' : cannot convert from 'enum MyType' to 'struct SMyVariable'
        No constructor could take the source type, or constructor overload resolution was ambiguous
C:\work\ArrTest\main.cpp(15) : error C2440: 'initializing' : cannot convert from 'float' to 'struct SMyVariable'
        No constructor could take the source type, or constructor overload resolution was ambiguous
Error executing cl.exe.

ArrTest.exe - 16 error(s), 0 warning(s)

문제가 무엇이고 어떻게 해야 하는지에 대해서 알려주시면 감사하겠습니다.