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..\display.h(72): warning: #231-D: declaration is not visible outside of function

Bruce Partridge

..\display.h(72): warning: #231-D: declaration is not visible outside of function

I got message when I included a header file containing this line:

void DISPLAY_string_date_time(const struct tm * tim, DISPLAY_MSG * p_message);

I found the problem - I hadn't included <time.h> in the two cases that caused the warning.

After a lot of searching for what this warning means, I can't find any explanation.

Can anyone translate what the compiler is saying?

Parents
  • 0 in reply to ImPer Westermark

    Here is the code. I have included the relevant bits of what's in the include file.

    To clarify one more time, there are no errors. It is only a warning. It compiles and runs. But I can't check in code with warnings, so I had to find it.

    #include <time.h>
...more
struct tm {
    int tm_sec;   /* seconds after the minute, 0 to 60
                     (0 - 60 allows for the occasional leap second) */
    int tm_min;   /* minutes after the hour, 0 to 59 */
    int tm_hour;  /* hours since midnight, 0 to 23 */
    int tm_mday;  /* day of the month, 1 to 31 */
    int tm_mon;   /* months since January, 0 to 11 */
    int tm_year;  /* years since 1900 */
    int tm_wday;  /* days since Sunday, 0 to 6 */
    int tm_yday;  /* days since January 1, 0 to 365 */
    int tm_isdst; /* Daylight Savings Time flag */
    union {       /* ABI-required extra fields, in a variety of types */
        struct {
            int __extra_1, __extra_2;
        };
        struct {
            long __extra_1_long, __extra_2_long;
        };
        struct {
            char *__extra_1_cptr, *__extra_2_cptr;
        };
        struct {
            void *__extra_1_vptr, *__extra_2_vptr;
        };
    };
};
...more

#include "display.h"
...more
typedef struct
{
    uint32_t    x;
    uint32_t    y;
    uint32_t    size;
    uint32_t    font;
    uint8_t     text[24];
} DISPLAY_MSG;
void DISPLAY_string_date_time(const struct tm * tim, DISPLAY_MSG * p_message);
...more

    If I comment out <time.h>, I get the warning and a clean compile. With <time.h> in I don't get the warning.

    I don't understand why I wouldn't just get an "Identifier undefined" type of error.

    The reason I'm willing to try to find an answer is that I spent a lot of time searching for an explanation. If I understood why I got that error this time, I might find it faster next time. It would have taken 10 seconds to find if I had got an "Identifier undefined" error.

Reply
  • 0 in reply to ImPer Westermark

    Here is the code. I have included the relevant bits of what's in the include file.

    To clarify one more time, there are no errors. It is only a warning. It compiles and runs. But I can't check in code with warnings, so I had to find it.

    #include <time.h>
...more
struct tm {
    int tm_sec;   /* seconds after the minute, 0 to 60
                     (0 - 60 allows for the occasional leap second) */
    int tm_min;   /* minutes after the hour, 0 to 59 */
    int tm_hour;  /* hours since midnight, 0 to 23 */
    int tm_mday;  /* day of the month, 1 to 31 */
    int tm_mon;   /* months since January, 0 to 11 */
    int tm_year;  /* years since 1900 */
    int tm_wday;  /* days since Sunday, 0 to 6 */
    int tm_yday;  /* days since January 1, 0 to 365 */
    int tm_isdst; /* Daylight Savings Time flag */
    union {       /* ABI-required extra fields, in a variety of types */
        struct {
            int __extra_1, __extra_2;
        };
        struct {
            long __extra_1_long, __extra_2_long;
        };
        struct {
            char *__extra_1_cptr, *__extra_2_cptr;
        };
        struct {
            void *__extra_1_vptr, *__extra_2_vptr;
        };
    };
};
...more

#include "display.h"
...more
typedef struct
{
    uint32_t    x;
    uint32_t    y;
    uint32_t    size;
    uint32_t    font;
    uint8_t     text[24];
} DISPLAY_MSG;
void DISPLAY_string_date_time(const struct tm * tim, DISPLAY_MSG * p_message);
...more

    If I comment out <time.h>, I get the warning and a clean compile. With <time.h> in I don't get the warning.

    I don't understand why I wouldn't just get an "Identifier undefined" type of error.

    The reason I'm willing to try to find an answer is that I spent a lot of time searching for an explanation. If I understood why I got that error this time, I might find it faster next time. It would have taken 10 seconds to find if I had got an "Identifier undefined" error.

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