linker undefine issue

[StanleyWu8787]

When I compile make all, I got follow message.

OS: Windows
Build system: make, cmake
Env: msys32

C:\windows\system32\cmd.exe /C "cd . && C:\msys64\mingw32\bin\cc.exe    -shared -o libisotp.dll -Wl,--out-implib,libisotp.dll.a -Wl,--major-image-version,0,--minor-image-version,0 CMakeFiles/isotp.dir/isotp.c
.obj  -s  -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 && cd ."
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0xf4): undefined reference to `isotp_user_send_can'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x13c): undefined reference to `isotp_user_send_can'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x161): undefined reference to `isotp_user_get_us'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x169): undefined reference to `isotp_user_get_us'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x1b2): undefined reference to `isotp_user_debug'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x1c3): undefined reference to `isotp_user_debug'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x1f0): undefined reference to `isotp_user_debug'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x203): undefined reference to `isotp_user_debug'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x365): undefined reference to `isotp_user_send_can'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x36a): undefined reference to `isotp_user_get_us'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x420): undefined reference to `isotp_user_get_us'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x59e): undefined reference to `isotp_user_get_us'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x5d1): undefined reference to `isotp_user_debug'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x61a): undefined reference to `isotp_user_send_can'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x68d): undefined reference to `isotp_user_debug'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x6b6): undefined reference to `isotp_user_debug'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x6db): undefined reference to `isotp_user_debug'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x6ec): undefined reference to `isotp_user_debug'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x6fd): undefined reference to `isotp_user_debug'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x7e2): undefined reference to `isotp_user_get_us'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x7f4): undefined reference to `isotp_user_get_us'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x814): undefined reference to `isotp_user_get_us'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x8b6): undefined reference to `isotp_user_send_can'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x8f7): undefined reference to `isotp_user_get_us'
C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/../../../../i686-w64-mingw32/bin/ld.exe: CMakeFiles/isotp.dir/isotp.c.obj:isotp.c:(.text+0x904): undefined reference to `isotp_user_get_us'
collect2.exe: error: ld returned 1 exit status

Could anyone offer example how to use this library?
Additional, I followed github workflow command, this mistake also show on my local but I have no idea why there is not show on github action.

[SimonCahill]

You cannot use this library as-is, you need to provide custom shim functions in your project.

See the README