Undefined reference when use c-function from c++ file

Asked Sep 17 '19 at 05:18

Active Feb 09 '20 at 16:35

Viewed 106 times

I just begin new project in eclipse. Try to use C-library from C++ file. In headers, where are prototypes of functions, here is:

#ifdef __cplusplus
 extern "C" {
#endif

// prototypes...
void Init_Configuration(void);

#ifdef __cplusplus
}
#endif

It's initialize.h. In main.cpp i include this file and try use function:

#include "initialize.h"

int main()
{
    Init_Configuration();

    // Life cycle
    while (1)
    {

    }
}

After compilation i get this error:

initialize.c:54: undefined reference to `SPI_Cmd'

In source C file "initialize.c", where i also include "initialize.h" i use function from C-library for stm32f2xx:

#include "initialize.h"
#include "stm32f2xx_rcc.h"
#include "stm32f2xx_spi.h"
#include "stm32f2xx_gpio.h"

// some code
SPI_Cmd(SPI1, DISABLE);
// some code

In this library also is this code:

#ifdef __cplusplus
 extern "C" {
#endif
...

I don't know where a problem. Please, help!

edited Feb 09 '20 at 16:35

old_timer

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asked Sep 17 '19 at 05:18

Эмиль Зулькарнаев

1

Are you sure you are compiling initialize.c? You need to do that as well as including the header. – jignatius Sep 17 '19 at 05:23
@jignatius, yes, i sure. And I included the headers – Эмиль Зулькарнаев Sep 17 '19 at 05:30
Possible duplicate of [What is an undefined reference/unresolved external symbol error and how do I fix it?](https://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved-external-symbol-error-and-how-do-i-fix) – Alan Birtles Sep 17 '19 at 05:44
Presumably you need to link to the `stm32f2xx` library – Alan Birtles Sep 17 '19 at 05:44
@AlanBirtles, in the sense of connecting to a file through include? – Эмиль Зулькарнаев Sep 17 '19 at 05:48
@AlanBirtles, In additional, I connected the library stm32f2xx.h. Did not help – Эмиль Зулькарнаев Sep 17 '19 at 05:57
1

Read the linked question and learn how to link libraries – Alan Birtles Sep 17 '19 at 06:05

Undefined reference when use c-function from c++ file

0 Answers0