I'm getting this odd error...
jos_log.c:16:13: error: field '_errno' declared as a function
ERRNO errno;
^
...when I compile this code:
typedef enum ERRNO_
{
/* ... */
}
ERRNO;
typedef struct LOG_ENTRY_
{
char * message;
ERRNO errno; // <--- Error here
ERR_SEV severity;
}
LOG_ENTRY;
Any ideas on what could be causing the problem?
The translation unit includes errno.h, through which errno is already
defined as preprocessor macro, whose definition provokes the error.
In my case, with gcc (Ubuntu 5.4.1-2ubuntu1~16.04) 5.4.1, the file:
#include <errno.h>
typedef int ERR_SEV;
typedef enum ERRNO_
{
x
}
ERRNO;
typedef struct LOG_ENTRY_
{
char * message;
ERRNO errno;
ERR_SEV severity;
}
LOG_ENTRY;
yields the similar error:
a.c:12:13: error: field ‘__errno_location’ declared as a function
ERRNO errno;
^
as result of:
# define errno (*__errno_location ())
within <bits/errno.h>, within <errno.h>. Without #include <errno.h>,
no error.
Unless you have made a typo in posting the disgnostic, this would suggest
that your <errno.h> imports the definition:
#define errno (*_errno ())
The solution is not to use errno as your field name.
