Compile C++ and C file together

[Pirmin Duss]

Hello lzSun


On 17.09.2018 11:30, lzSun wrote:
> Hello,
> I want to build a component which needs both C++ and  C files, however, I encountered some problem when I compiling them
> together. Here's the error:
> libc.lib.so: undefined reference to `Libc::Component::construct(Libc::Env&)'
> collect2: error: ld returned 1 exit status

In a Genode component using the libc, the function Libc::Component::construct() is required. It is there to initialize
some things that are needed by libc programs (eg. the command line parameters).

There are two methods to to provide this function:
 - link the posix library to your component
 - write it yourself

The posix library is a wrapper that provides the Libc::Component::construct() function and calls the main() method of
the program, after setting up some variables that are normally needed by posix programs.


Best regards,
Pirmin

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