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how to create a library compatible with the GNU toolchain

I have a Keil MDK project which outputs a library mc_comms.lib.  I have another Keil project which uses this library and don't have any issues. My customer is using STM Cube and can't build the same test project with the same library.

c:\st\stm32cubeide_1.6.0\stm32cubeide\plugins\com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.9-2020-q2-update.win32_1.5.0.202011040924\tools\arm-none-eabi\bin\ld.exe: cannot find -lB:/STM32/G4/Examples/CubeIDE_1_6_0/zti_lib/zti_lib/lib/mc_comms.lib
c:\st\stm32cubeide_1.6.0\stm32cubeide\plugins\com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.9-2020-q2-update.win32_1.5.0.202011040924\tools\arm-none-eabi\bin\ld.exe: cannot find -lB:\STM32\G4\Examples\CubeIDE_1_6_0\zti_lib\zti_lib\lib\mc_comms.lib

FYI:  

b:\STM32\G4\Examples\CubeIDE_1_6_0\zti_lib\zti_lib\lib>dir
Volume in drive B is home
Volume Serial Number is 4D4B-F115

Directory of b:\STM32\G4\Examples\CubeIDE_1_6_0\zti_lib\zti_lib\lib

03/18/2021 11:34 <DIR> .
03/17/2021 20:14 <DIR> ..
03/17/2021 18:16 2,139 mc_comms.h
03/18/2021 11:33 32,674 mc_comms.lib
2 File(s) 34,813 bytes
2 Dir(s) 11,366,381,383,680 bytes free

b:\STM32\G4\Examples\CubeIDE_1_6_0\zti_lib\zti_lib\lib>

Do you know what is my problem? How can I resolve it? 

Thanks.