[ECOS] Inter-package visibility

Bart Veer bartv@ecoscentric.com
Wed Mar 24 14:13:00 GMT 2004

>>>>> "Michele" == Michele Portolan <michele.Portolan@imag.fr> writes:

    Michele> Hi,
    Michele> I defined  package of mine, but I cannnot use it inside other eCos
    Michele> pre'existent ones.
    Michele> I have:
    Michele>  a configuration header: <pkgconf/mypkg.h>
    Michele> a module header and relative source file:  mymodule.h and mymodule.c
    Michele> inside I have only one function: void myfunction(void)
    Michele> in mymodule.h i defined it as "extern" (I saw it done in some examples, like
    Michele> errno.h/errno.c)


    Michele> What is the problem? Please help, I am completely
    Michele> blocked!

At a guess the problem is caused by C vs. C++ linkage. The kernel is
written in C++ so by default it will expect myfunction() to be a C++
function, not a C one. In mymodule.h use externC instead of extern.
externC is a macro defined in cyg/infra/cyg_type.h which will do the
right thing irrespective of whether you are compiling C or C++ code.


Bart Veer                       eCos Configuration Architect
http://www.ecoscentric.com/     The eCos and RedBoot experts

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