Lwip issue with camkes and odroidc2

[no00237]

Trying to build a camkes application with a component that tries to use the lwip library results in this error message:

FAILED: client.instance.bin
: && /usr/bin/ccache /usr/bin/aarch64-linux-gnu-gcc --sysroot=/home/nkem/Documents/Test2/build -march=armv8-a+crc -D__KERNEL_64__ -g -D__KERNEL_64__ -static -nostdlib -z max-page-size=0x1000 -static -nostdlib -u _camkes_start -e _camkes_start -Wl,--script=/home/nkem/Documents/Test2/build/client/linker.lds -Wl,-umuslcsys_init_muslc /home/nkem/Documents/Test2/build/lib/crt0.o /home/nkem/Documents/Test2/build/lib/crti.o /usr/lib/gcc-cross/aarch64-linux-gnu/7/crtbegin.o CMakeFiles/client.instance.bin.dir/apps/lwip_test/components/Client/src/main.c.obj CMakeFiles/client.instance.bin.dir/client/camkes.c.obj CMakeFiles/client.instance.bin.dir/client/camkes.environment.c.obj CMakeFiles/client.instance.bin.dir/client/eth_drv_seL4Ethdriver_0.c.obj -Wl,--start-group -lgcc -lgcc_eh libsel4/libsel4.a sel4runtime/libsel4runtime.a camkes-tool/libsel4camkes/libsel4camkes.a seL4_libs/libsel4sync/libsel4sync.a util_libs/libutils/libutils.a seL4_libs/libsel4vka/libsel4vka.a seL4_libs/libsel4utils/libsel4utils.a seL4_libs/libsel4bench/libsel4bench.a seL4_libs/libsel4platsupport/libsel4platsupport.a util_libs/libplatsupport/libplatsupport.a seL4_libs/libsel4vspace/libsel4vspace.a seL4_libs/libsel4muslcsys/libsel4muslcsys.a -llwip seL4_libs/libsel4utils/libsel4utils.a seL4_libs/libsel4platsupport/libsel4platsupport.a sel4runtime/libsel4runtime.a util_libs/libplatsupport/libplatsupport.a util_libs/libfdt/libfdt.a -Wl,--undefined=arm_gic_ptr,--undefined=tegra_ictlr_ptr,--undefined=arm_gicv3_ptr,--undefined=fsl_avic_ptr,--undefined=ti_omap3_ptr seL4_libs/libsel4simple-default/libsel4simple-default.a seL4_libs/libsel4vspace/libsel4vspace.a seL4_libs/libsel4simple/libsel4simple.a seL4_libs/libsel4vka/libsel4vka.a util_libs/libelf/libelf.a util_libs/libcpio/libcpio.a -Wl,-u -Wl,__vsyscall_ptr seL4_libs/libsel4debug/libsel4debug.a projects_libs/libvirtqueue/libvirtqueue.a libsel4/libsel4.a util_libs/libutils/libutils.a musllibc/build-temp/stage/lib/libc.a -Wl,--end-group /usr/lib/gcc-cross/aarch64-linux-gnu/7/crtend.o /home/nkem/Documents/Test2/build/lib/crtn.o -o client.instance.bin && :
/usr/lib/gcc-cross/aarch64-linux-gnu/7/../../../../aarch64-linux-gnu/bin/ld: cannot find -llwip
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

[nomadeel]

Can you show the CMakeLists.txt file of the application that you are trying to build?

[no00237]

This is the CMakeLists.txt file of a client component I tried to make. I tried using how the picoserver example app was built as an idea as I couldn't find any recent lwip examples but I'm pretty sure I may just be missing something critical.

---

cmake_minimum_required(VERSION 3.7.2)

project(ComponentProver C)

DeclareCAmkESComponent(
Client
SOURCES
src/main.c
LIBS
lwip
)

---

Am I just missing something like this for Lwip as I didn't see anything like it in the apps I had found that used lwip:
set(LibPicotcp ON CACHE BOOL "" FORCE)

[nomadeel]

Yeah the LibLwip CMake 'set' should be inside the CMakeLists.txt file of your application.

So, something like set(LibLwip ON CACHE BOOL "" FORCE).

[no00237]

So I did try to try that but then I got issues with the lwipopts.h file not being included and from looking around I found the file in util_libs but I still get this issue.

[2/257] Building C object util_libs/li.../lwip/src/apps/snmp/snmp_netconn.c.obj
FAILED: util_libs/liblwip/CMakeFiles/lwip.dir/home/nkem/Documents/Test2/projects/lwip/src/apps/snmp/snmp_netconn.c.obj
/usr/bin/ccache /usr/bin/gcc --sysroot=/home/nkem/Documents/Test2/build -I/home/nkem/Documents/Test2/projects/lwip/src/include -I/home/nkem/Documents/Test2/projects/util_libs/liblwip/include -I/home/nkem/Documents/Test2/projects/util_libs/liblwip/include/lwip -Imusllibc/build-temp/stage/include -m64 -march=nehalem -D__KERNEL_64__ -g -nostdinc -fno-pic -fno-pie -fno-stack-protector -fno-asynchronous-unwind-tables -ftls-model=local-exec -mtls-direct-seg-refs -m64 -march=nehalem -D__KERNEL_64__ -std=gnu11 -MD -MT util_libs/liblwip/CMakeFiles/lwip.dir/home/nkem/Documents/Test2/projects/lwip/src/apps/snmp/snmp_netconn.c.obj -MF util_libs/liblwip/CMakeFiles/lwip.dir/home/nkem/Documents/Test2/projects/lwip/src/apps/snmp/snmp_netconn.c.obj.d -o util_libs/liblwip/CMakeFiles/lwip.dir/home/nkem/Documents/Test2/projects/lwip/src/apps/snmp/snmp_netconn.c.obj -c /home/nkem/Documents/Test2/projects/lwip/src/apps/snmp/snmp_netconn.c
In file included from /home/nkem/Documents/Test2/projects/lwip/src/include/lwip/apps/snmp_opts.h:40:0,
from /home/nkem/Documents/Test2/projects/lwip/src/apps/snmp/snmp_netconn.c:35:
/home/nkem/Documents/Test2/projects/lwip/src/include/lwip/opt.h:51:10: fatal error: lwipopts.h: No such file or directory
#include "lwipopts.h"
^~~~~~~~~~~~
compilation terminated.

[nomadeel]

For that, you need to copy the default lwipopts.h file inside the utils_libs/liblwip/default_opts/ folder and paste it to your application's folder. Afterwards, inside the application's CMakeLists.txt file, you'll need to use the AddLWIPConfiguration CMake function in util_libs/liblwip/lwip_helpers.cmake to point to the directory that contains the pasted lwipopts.h file.

[kent-mcleod]

@no00237 there's this old PR that provides an example lwip application: seL4/camkes#13
It might help guide you.

[kent-mcleod]

And here is another lwipopts.h that was used in a different echo server example: https://github.com/SEL4PROJ/camkes-apps-ethernet-demo-x86--devel/blob/master/lwipopts.h

[kent-mcleod]

Closing due to inactivity. Feel free to reopen.