CMake can not determine linker language for target: iperf

[Ketanbankar]

CMake Error: CMake can not determine linker language for target: iperf

my CMakeFile.txt

---

Sets the minimum version of CMake required to build the native

library. You should either keep the default value or only pass a

value of 3.4.0 or lower.

cmake_minimum_required(VERSION 3.4.1)
#project(iperf3)
set(IPERF_SRC ${CMAKE_SOURCE_DIR}/iperf3/src)

check some architecture specific build options

if("${ANDROID_ABI}" MATCHES "arm64-v8a|x86_64")
set(HAVE_SO_MAX_PACING_RATE 1)
endif()

generate src/iperf_config.h

configure_file(${CMAKE_SOURCE_DIR}/iperf_config.h.in ${CMAKE_BINARY_DIR}/src/iperf_config.h)

###################################

Creates and names a library, sets it as either STATIC

or SHARED, and provides the relative paths to its source code.

You can define multiple libraries, and CMake builds it for you.

Gradle automatically packages shared libraries with your APK.

add_library( iperf

         SHARED

         ${IPERF_SRC}/src/cjson.c
         ${IPERF_SRC}/src/iperf_api.c
         ${IPERF_SRC}/src/iperf_error.c
         ${IPERF_SRC}/src/iperf_client_api.c
         ${IPERF_SRC}/src/iperf_locale.c
         ${IPERF_SRC}/src/iperf_server_api.c
         ${IPERF_SRC}/src/iperf_tcp.c
         ${IPERF_SRC}/src/iperf_udp.c
         ${IPERF_SRC}/src/iperf_sctp.c
         ${IPERF_SRC}/src/iperf_util.c
         ${IPERF_SRC}/src/net.c
         ${IPERF_SRC}/src/tcp_info.c
         ${IPERF_SRC}/src/tcp_window_size.c
         ${IPERF_SRC}/src/timer.c
         ${IPERF_SRC}/src/units.c
         )

Searches for a specified prebuilt library and stores the path as a

variable. Because system libraries are included in the search path by

default, you only need to specify the name of the public NDK library

you want to add. CMake verifies that the library exists before

completing its build.

find_library( # Sets the name of the path variable.
log-lib

          # Specifies the name of the NDK library that
          # you want CMake to locate.
          log )

Specifies libraries CMake should link to your target library. You

can link multiple libraries, such as libraries you define in the

build script, prebuilt third-party libraries, or system libraries.

target_link_libraries( # Specifies the target library.
iperf

                   # Links the target library to the log library
                   # included in the NDK.
                   ${log-lib} )