Using external ANSI C library

[npascual]

Hello,

It's possible to include in a Qt project an external library written in ANSI C??

I tried it writting,

#include "library.h"

#include "library.h"

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in my source program, and inserting

LIBS += -Llibrary.lib

LIBS += -Llibrary.lib

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in my project definition.

When I compile the project, it seems that Qt finds the library correctly, but I get the followings error messages

undefined reference to 'library_function@8'

undefined reference to 'library_function@8'

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Help me please!! Thanks!!

[mcosta]

HI, you have to provide "external linkage" information to your compiler

Try with

extern "C" {
#include "library.h"
}

extern "C" {
#include "library.h"
}

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Notice that the correct syntax for linking libraries in .pro file is

LIBS += -L<library_path> -l<library_basename>

LIBS += -L<library_path> -l<library_basename>

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Eg

LIBS += -Llibs/ -llibrary

LIBS += -Llibs/ -llibrary

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[squidge]

Do you state the fact that the library is a C-style library (rather than C++) in the header file or before the #include statement?

Eg.

extern "C" {
#include "mylib.h"
};

extern "C" {
#include "mylib.h"
};

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