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Old 04-17-2008, 08:45 PM   #1
leon.zcom
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Registered: Apr 2008
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Question 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?


-------------------------
OS: 2.6.18-1.2798.fc6
 
Old 04-17-2008, 09:04 PM   #2
JMJ_coder
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Registered: Apr 2006
Distribution: Fedora
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Hello,

Try changing pb->ulMsgType to pb->a.ulMsgType
 
Old 04-17-2008, 09:20 PM   #3
leon.zcom
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Registered: Apr 2008
Posts: 15

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I have fix the problem,

GCC need add a option "-fms-extensions".
 
Old 04-18-2008, 04:40 PM   #4
osor
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Registered: Jan 2006
Distribution: (H)LFS, Gentoo
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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.
 
  


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