ConvBin Depends on GUI extern functions

[geoeo]

I am trying to build the convbin app from source my cmake is as follows:

cmake_minimum_required(VERSION 3.20)
project(rtklib C)

file(GLOB_RECURSE SOURCES "src/*.*")
file(GLOB_RECURSE SOURCES_2 "src/rcv/*.*")

include_directories(src)

add_library(rtklib
        SHARED
        ${SOURCES}
        ${SOURCES_2})

target_include_directories(rtklib PUBLIC src)
target_include_directories(rtklib PUBLIC src/rcv)

target_link_libraries(rtklib PUBLIC pthread m)

install(TARGETS rtklib LIBRARY
        DESTINATION lib COMPONENT library
        CONFIGURATIONS ${CMAKE_CONFIGURATION_TYPES})


add_executable(rnx2rtkp app/rnx2rtkp/rnx2rtkp.c)
target_link_libraries(rnx2rtkp rtklib)

add_executable(convbin app/convbin/convbin.c )
target_link_libraries(convbin rtklib)

But I am getting the link errors for convbin: (rnx2rtkp works)

/usr/bin/ld: librtklib.so: undefined reference to `settspan'
/usr/bin/ld: librtklib.so: undefined reference to `settime'

I checked and these are defined in postmain.cpp which is a different app and has gui dependencies which I want to avoid.
How can I build convbin from sources as a purely CLI tool?

[geoeo]

I fixed this my adding empty method stubs to convbin.c.
Not sure why its searching for these though

[yangtseJin]

you should use the static library instead of dynamic library, such as

add_library(rtklib
        STATIC
        ${SOURCES}
        ${SOURCES_2})