CODEWITHSUNDEEP
ctypedef
jenny
jenny

Reputation: 520

Compiler gives an error called Unknown type name

I have my following functions declared in stack.h file and when I compile my project an error Unknown type name is been shown for l_ifc_handle. 

extern l_bool        l_ifc_init (l_ifc_handle iii);
extern void          l_ifc_wake_up (l_ifc_handle iii);
extern void          l_ifc_rx (l_ifc_handle iii);
extern void          l_ifc_tx (l_ifc_handle iii);
extern l_u16         l_ifc_read_status (l_ifc_handle iii);
extern void          l_ifc_aux (l_ifc_handle iii);
extern l_u16         l_sys_irq_disable (l_ifc_handle iii);
extern void          l_sys_irq_restore (l_ifc_handle iii);

But my l_ifc_handle is structure variable in another file called driver.h and used in driver.c 

typedef enum { 
   LI0
}l_ifc_handle;

This driver.h file includes my stack.h header file. But the l_ifc_handle is in my driver.h file.

If I use 

typedef enum { 
   LI0
} extern l_ifc_handle;

then it gives an error called multiple storage classes. In which file should I place the above typedef?

Upvotes: 1

Views: 2525

Answers (2)

3CxEZiVlQ
3CxEZiVlQ

Reputation: 38440

Do not include driver.h into stack.h. Use forward declarations instead and include driver.h into you .c files when you need LI0.

extern l_bool        l_ifc_init (enum l_ifc_handle iii);
extern void          l_ifc_wake_up (enum l_ifc_handle iii);
extern void          l_ifc_rx (enum l_ifc_handle iii);
extern void          l_ifc_tx (enum l_ifc_handle iii);
extern l_u16         l_ifc_read_status (enum l_ifc_handle iii);
extern void          l_ifc_aux (enum l_ifc_handle iii);
extern l_u16         l_sys_irq_disable (enum l_ifc_handle iii);
extern void          l_sys_irq_restore (enum l_ifc_handle iii);

Upvotes: 0

sameer chaudhari
sameer chaudhari

Reputation: 1018

typedef enum { 
   LI0
} extern l_ifc_handle;

then it gives an error called multiple storage classes.

Storage specifier(typedef, auto, static, register, extern) are mutual exclusive, You can't use them in same declaration.

Is typedef a storage-class-specifier?

Upvotes: 5

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