I am playing with some code that has been automatically generated
from ASN.1 data specification found in RFC 3280. One of the structures
generated reads as follows:
typedef struct TBSCertList {
Version_t *version /* OPTIONAL */;
AlgorithmIdentifier_t signature;
Name_t issuer;
Time_t thisUpdate;
struct Time *nextUpdate /* OPTIONAL */;
struct revokedCertificates {
A_SEQUENCE_OF(struct Member {
CertificateSerialNumber_t userCertificate;
Time_t revocationDate;
struct Extensions *crlEntryExtensions /
* OPTIONAL */;
/* Context for parsing across buffer boundaries */
asn_struct_ctx_t _asn_ctx;
} ) list;
/* Context for parsing across buffer boundaries */
asn_struct_ctx_t _asn_ctx;
} *revokedCertificates;
struct Extensions *crlExtensions /* OPTIONAL */;
/* Context for parsing across buffer boundaries */
asn_struct_ctx_t _asn_ctx;
} TBSCertList_t;
/* Implementation */
extern asn_TYPE_descriptor_t asn_DEF_TBSCertList;
}
where A_SEQUENCE_OF() is defined as
#define A_SEQUENCE_OF(type) \
struct { \
type **array; \
int count; /* Meaningful size */ \
int size; /* Allocated size */ \
void (*free)(type *); \
}
The preprocessor expands this as
typedef struct TBSCertList {
Version_t *version;
AlgorithmIdentifier_t signature;
Name_t issuer;
Time_t thisUpdate;
struct Time *nextUpdate;
struct revokedCertificates {
struct {
struct Member {
CertificateSerialNumber_t userCertificate;
Time_t revocationDate;
struct Extensions *crlEntryExtensions;
asn_struct_ctx_t _asn_ctx;
} **array;
int count;
int size;
void (*free) (struct Member {
CertificateSerialNumber_t userCertificate;
Time_t revocationDate;
struct Extensions * crlEntryExtensions;
asn_struct_ctx_t _asn_ctx;
} *);
} list;
asn_struct_ctx_t _asn_ctx;
} *revokedCertificates;
struct Extensions *crlExtensions;
asn_struct_ctx_t _asn_ctx;
} TBSCertList_t;
This compiles all right, but the GCC compiler generates the
following warning:
TBSCertList.h:47: warning: structure defined inside parms
TBSCertList.h:47: warning: `struct Member' declared inside parameter list
TBSCertList.h:47: warning: its scope is only this definition or
declaration, which is probably not what you want
Line 47 is the line that reads
} ) list;
in the code above, before the preprocessing.
Now I want to believe that this code is generated the way it is
generated for some good reason. What I do not understand is what the
compiler is complaining about. Anybody care to explain? What is it about
struct Member that the compiler reckons that that's not what we want?
