GCC compile problem：struct A have a member variable which is just a struct type name？
 

my code is as follow：

typedef struct a
{
uint32_t ulMsgType;
} a;

typedef struct b
{
a;
uint32_t ulIfCount;

} b;

b *pb;

if my code use pb->ulMsgType, then GCC (4.1.1 20061011) cannot compile it ,it will output an error that struct b doesn't have member "ulMsgType".

But if I run the code in a cross-compile environment, just like hardhat3.0, using xscale_be-gcc(3.2.1 20020930), the code can be compiled successfully.

So my questions is what should i do to make it compile successfully?

Whether I could add some options for GCC (4.1.1 20061011) to fix the problem, if so, what options should I add?


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OS: 2.6.18-1.2798.fc6

Hello,

Try changing pb->ulMsgType to pb->a.ulMsgType

I have fix the problem,

GCC need add a option "-fms-extensions".

Let me point out that although it “works”, this is not standards-compliant behavior. In fact, the correct thing to do is to name your field so you can refer to it directly.