Hello,
I use an open source projet (open62541 on github) to get OPC-UA implementation over lwip.
When my projet is compiled with open62541 source code, it's works without error.
But the 2 files generated 'open62541.c' and 'open62541.h' are very big (around 4 and 1 Mbytes).
My cross compiler is gcc form STM32CubeIDE Version 1.9
GNU Tools for STM32 (10.3-2021.10)
arm-none-eabi-gcc -v
Using built-in specs.
OLLECT_GCC=arm-none-eabi-gcc
COLLECT_LTO_WRAPPER=c:/st/stm32cubeide_1.9.0/stm32cubeide/plugins/com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.10.3-2021.10.win32_1.0.0.202111181127/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/lto-wrapper.exe
Target: arm-none-eabi
Configured with: /build/gnu-tools-for-stm32_10.3-2021.10.20211105-1100.....
Thread model: single
Supported LTO compression algorithms: zlib
gcc version 10.3.1 20210824 (release) (GNU Tools for STM32 10.3-2021.10.20211105-1100)
To optimize my compilation operation, I want to make a library for open62541 functions.
I compile open62541 source code to get a libopen62541.a file, then I link this library with my projet.
I've some linker error, as you can see below:
arm-none-eabi-gcc -o "STM32_TBUS.elf" @"objects.list" -lmbedtls -lopen62541-mbedtls -mcpu=cortex-m7 -T"D:\ST\STM32CubeIDE\workspace\STM32_TBUS\STM32H743ZITx_FLASH.ld" --specs=nosys.specs -Wl,-Map="STM32_TBUS.map" -Wl,--gc-sections -static -L"D:\ST\STM32CubeIDE\workspace\STM32_TBUS\Lib\mbedtls" -L"D:\ST\STM32CubeIDE\workspace\STM32_TBUS\Lib\OPC-UA" --specs=nano.specs -mfpu=fpv5-d16 -mfloat-abi=hard -mthumb -Wl,--start-group -lc -lm -Wl,--end-group
c:\st\stm32cubeide_1.9.0\stm32cubeide\plugins\com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.10.3-2021.10.win32_1.0.0.202111181127\tools\arm-none-eabi\bin\ld.exe: D:\ST\STM32CubeIDE\workspace\STM32_TBUS\Lib\OPC-UA\libopen62541-mbedtls.a(open62541.o): in function `ServerNetworkLayerTCP_close':
open62541.c:(.text.ServerNetworkLayerTCP_close+0xc): undefined reference to `lwip_shutdown'
c:\st\stm32cubeide_1.9.0\stm32cubeide\plugins\com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.10.3-2021.10.win32_1.0.0.202111181127\tools\arm-none-eabi\bin\ld.exe: D:\ST\STM32CubeIDE\workspace\STM32_TBUS\Lib\OPC-UA\libopen62541-mbedtls.a(open62541.o): in function `connection_write':
open62541.c:(.text.connection_write+0x30): undefined reference to `lwip_send'
c:\st\stm32cubeide_1.9.0\stm32cubeide\plugins\com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.10.3-2021.10.win32_1.0.0.202111181127\tools\arm-none-eabi\bin\ld.exe: open62541.c:(.text.connection_write+0x52): undefined reference to `lwip_poll'
c:\st\stm32cubeide_1.9.0\stm32cubeide\plugins\com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.10.3-2021.10.win32_1.0.0.202111181127\tools\arm-none-eabi\bin\ld.exe: D:\ST\STM32CubeIDE\workspace\STM32_TBUS\Lib\OPC-UA\libopen62541-mbedtls.a(open62541.o): in function `connection_recv':
open62541.c:(.text.connection_recv+0x50): undefined reference to `lwip_select'
...
I suspect that functions called from library are not correctly linked, perhaps the optimizer remove some function not use from the main code.
But theses functions are used from the library.
--[ main_code ] --> [open62541 library] ---|
--[ lwip stack ] < ------------------------|
The functions not found are those of lwip.
If anyone has any idea, thanks for your help.
