Linking a L4 library with a L4Linux app?

[Leon Brits]

Hi Christian,

> linux_stub_lib is no (L4)Linux application library - it's the in-kernel
> equivalent to a Linux kernel module (That's why it's called "library" ;-).
> The real code is in "pkg/con/example/linux_stub", which builds a Linux
> kernel module for the DROPS console system.
Sorry, I've mistakenly add the "_lib". It seems that I may need to add
this library to both an app and a kernel module.

> AFAIK doing IPC under L4Linux <= 2.4 is as easy as including
> <l4/sys/ipc.h> and calling the IPC bindings. You need no library for that
> purpose. The Makefile mode is "mode=l4linux".

This is what I am trying...
I wrote a simple Linux app (MODE=l4linux) that compiles with the
existing library source files directly (no lib). My library starts some
l4threads which does some IPC and receives dataspaces which is attached
to the apps VM. As you know the compile fails. 
So, to debug I have commented out all source code in the library source
files and started to selectively uncomment sections and functions. Every
time I uncomment a section I compile and run it. The compiles succeeds
until I added the section that attaches the received dataspace to the
app's VM with l4rm_attach().

I get the following compile error:

  ==> Linking msgsrv
../../../../../lib/x86_586/l4v2/libdm_generic.a(map.o)(.text+0x1a0): In
function `l4dm_map':
/root/DROPS/l4/pkg/dm_generic/lib/clientlib/src/map.c:251: undefined
reference to `l4rm_lookup'
../../../../../lib/x86_586/l4v2/libl4env.a(environment.o)(.text+0x17f):
In function `l4env_get_default_dsm':
/root/DROPS/l4/pkg/l4env/lib/src/environment.c:251: undefined reference
to `names_waitfor_name'
../../../../../lib/x86_586/l4v2/libl4env.a(startup.o)(.text+0x6): In
function `__startup_main':
/root/DROPS/l4/pkg/l4env/lib/src/startup.c:59: undefined reference to
`crt0_construction'
../../../../../lib/x86_586/l4v2/libl4env.a(startup.o)(.text+0x32): In
function `__setup_fixed':
/root/DROPS/l4/pkg/l4env/lib/src/startup.c:74: undefined reference to
`_prog_img_start'
../../../../../lib/x86_586/l4v2/libl4env.a(startup.o)(.text
+0x39):/root/DROPS/l4/pkg/l4env/lib/src/startup.c:75: undefined
reference to `_prog_img_end'
../../../../../lib/x86_586/l4v2/libl4env.a(startup.o)(.text
+0x78):/root/DROPS/l4/pkg/l4env/lib/src/startup.c:80: undefined
reference to `crt0_tramppage'
../../../../../lib/x86_586/l4v2/libl4env.a(startup.o)(.text+0x191): In
function `__main':
/root/DROPS/l4/pkg/l4env/lib/src/startup.c:136: undefined reference to
`crt0_multiboot_info'
../../../../../lib/x86_586/l4v2/libl4env.a(startup.o)(.text
+0x1a5):/root/DROPS/l4/pkg/l4env/lib/src/startup.c:136: undefined
reference to `crt0_multiboot_flag'
../../../../../lib/x86_586/l4v2/libl4env.a(startup.o)(.text
+0x1b7):/root/DROPS/l4/pkg/l4env/lib/src/startup.c:139: undefined
reference to `crt0_multiboot_info'
../../../../../lib/x86_586/l4v2/libl4env.a(startup.o)(.text+0x27d): In
function `__main':
/root/DROPS/l4/pkg/l4env/lib/src/OBJ-x86_586-l4v2/../../../../../include/l4/l4rm/l4rm.h:1037: undefined reference to `l4rm_do_area_setup'
../../../../../lib/x86_586/l4v2/libl4env.a(startup.o)(.text+0x2af): In
function `__main':
/root/DROPS/l4/pkg/l4env/lib/src/OBJ-x86_586-l4v2/../../../../../include/x86/l4v2/l4/sys/syscalls-l42-gcc3-nopic.h:39: undefined reference to `crt0_stack_high'
../../../../../lib/x86_586/l4v2/libl4env.a(startup.o)(.text
+0x2b4):/root/DROPS/l4/pkg/l4env/lib/src/OBJ-x86_586-l4v2/../../../../../include/x86/l4v2/l4/sys/syscalls-l42-gcc3-nopic.h:39: undefined reference to `crt0_stack_low'
collect2: ld returned 1 exit status
make[1]: *** [msgsrv] Error 1

The MODE setting in the Makefile includes the libraries:
dm_generic, dm_mem, names, l4util, loaderif, l4env, l4env_err, slab,
l4sys.
I added libraries:
thread_linux, semaphore, loglinux, l4rm

I am aware of the problem which Adam mentioned that the L4Linux server
may overmap the attached memory but at the moment I can not even map the
dataspace due to this compile error.

Any suggestions to solve this compile problem.

Thanks again for all your time!
Leon