Enabling HTTPd breaks the whole project

[abeslic]

Hi, I'm playing around with lwIP on my Nucleo-H743ZI and I was able to make ping work, udp/tcp echo and snmp too. But when I enable HTTPd the project doesn't wont do compile I just get a lot of undefined references, I tried to make a new project and same thing happened. This are the compiler error messages that I get:

Core/Src/main.c:113: undefined reference to `httpd_init' 

LWIP/App/lwip.o: in function `MX_LWIP_Init':
LWIP/App/lwip.c:80: undefined reference to `lwip_init'
LWIP/App/lwip.c:88: undefined reference to `netif_add'
LWIP/App/lwip.c:91: undefined reference to `netif_set_default'
LWIP/App/lwip.c:96: undefined reference to `netif_set_up'
LWIP/App/lwip.c:101: undefined reference to `netif_set_down'
LWIP/App/lwip.c:105: undefined reference to `netif_set_link_callback'
LWIP/App/lwip.c:112: undefined reference to `ethernet_input'
LWIP/App/lwip.c:161: undefined reference to `sys_check_timeouts'
LWIP/Target/ethernetif.c:202: undefined reference to `memp_init_pool'
LWIP/Target/ethernetif.c:348: undefined reference to `pbuf_free'
LWIP/Target/ethernetif.c:431: undefined reference to `etharp_output'
LWIP/Target/ethernetif.c:441: undefined reference to `memp_free_pool'
LWIP/Target/ethernetif.c:660: undefined reference to `netif_set_down'
LWIP/Target/ethernetif.c:661: undefined reference to `netif_set_link_down'
LWIP/Target/ethernetif.c:699: undefined reference to `netif_set_up'
LWIP/Target/ethernetif.c:700: undefined reference to `netif_set_link_up'
LWIP/Target/ethernetif.c:709: undefined reference to `memp_malloc_pool'
LWIP/Target/ethernetif.c:718: undefined reference to `pbuf_alloced_custom'

I did include httpd.h in main and I try manually including other libs but it didn't help. When disable http it compiles normally.

I'm new to this so any advice will be helpful. 

Thanks in advance

Alex

[Amine_ben]

Hey everyone, I ran into the same issue when building a project with STM32CubeIDE, using CMSIS-RTOS v2, and LwIP. I kept getting errors like:

 

 

undefined reference to `osKernelInitialize`
undefined reference to `osThreadNew`
undefined reference to `tcpip_init`

 

After trying several fixes, I finally found the solution:

 

1. Go to Source Location:

   • Open your project in STM32CubeIDE.
   • Navigate to Project -> Properties -> C/C++ General -> Paths and Symbols -> Source Location.

2. Add the Middlewares Folder:

   • You’ll likely notice that the Middlewares folder is missing from the list.
   • Click on Add Folder and select the Project/Middlewares folder in your project directory.

3. Rebuild the Project:

   • After adding the folder, clean the project (Project -> Clean) and rebuild it (Project -> Build).

 

This fixed the issue for me, and I hope it helps others as well.