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I am trying to build static executable but having no success in building up. It was working fine before adding following lines:

SET(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
SET(BUILD_SHARED_LIBRARIES OFF)
SET(CMAKE_EXE_LINKER_FLAGS "-static")

I want to convert it into static executable. Any help or suggestions?

Here is my cmake Code : 

cmake_minimum_required(VERSION 3.5)

set(CMAKE_CXX_STANDARD 11)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -g -Werror -lpthread")
SET(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
SET(BUILD_SHARED_LIBRARIES OFF)
SET(CMAKE_EXE_LINKER_FLAGS "-static")


add_executable(${PROJECT_NAME} MACOSX_BUNDLE
                               main.cc
                               audiofile.cc
                               button.cc
                               entity.cc
                               entity_group.cc
                               filter.cc
                               splash_screen_state.cc
                               sprite.cc
                               signal.cc
                               signal_chunk.cc
                               sound_edit_state.cc
                               splash_screen_state.cc
                               sprite.cc
                               state.cc
                               state_stack.cc
                               waveform_chunk_display.cc
                               waveform_chunk_select_button.cc
                               waveform_chunk_select_display.cc
                               waveform_component_display.cc
                               waveform_display.cc
                               wwest_app.cc
                               play_original_button.cc
                               low_pass_button.cc
                               high_pass_button.cc
                               mid_pass_button.cc
                               reset_button.cc
                               play_modified_button.cc
                               speed_up_button.cc
                               slow_down_button.cc)

find_package(PkgConfig REQUIRED)
pkg_search_module(SDL2 REQUIRED sdl2)
pkg_search_module(SDL2_IMAGE REQUIRED SDL2_image>=2.0.0)
pkg_search_module(SDL2_TTF REQUIRED SDL2_ttf)
pkg_search_module(NFD REQUIRED sdl2)
find_package(OpenGL REQUIRED)

include_directories(${SDL2_INCLUDE_DIRS}
                    ${SDL2_IMAGE_INCLUDE_DIR}
                    ${SDL2_TTF_INCLUDE_DIR}
                    ${OPENGL_INCLUDE_DIRS}
                ${NFD_INCLUDE_DIRS}
                ${GTK3_INCLUDE_DIRS})

pkg_check_modules(GTK3 REQUIRED gtk+-3.0)
link_directories(${GTK3_LIBRARY_DIRS})
add_definitions(${GTK3_CFLAGS_OTHER})

target_link_libraries(${PROJECT_NAME} ${SDL2_LIBRARIES}
                                      ${SDL2_IMAGE_LIBRARIES}
                                      ${SDL2_TTF_LIBRARIES}
                                      ${OPENGL_LIBRARIES}
                                      ${NFD_LIBRARIES} 
                                      ${GTK3_LIBRARIES} 
                                      nfd
                                      pthread)

I tried merging steps from the link, but not working and getting following error:

/usr/bin/ld: attempted static link of dynamic object `/usr/lib/x86_64-linux-gnu/libGLU.so’
collect2: error: ld returned 1 exit status
src/CMakeFiles/wwest-outreach-app.out.dir/build.make:774: recipe for target ‘bin/wwest-outreach-app.out’ failed
make[2]: * [bin/wwest-outreach-app.out] Error 1
CMakeFiles/Makefile2:85: recipe for target ‘src/CMakeFiles/wwest-outreach-app.out.dir/all’ failed
make[1]: * [src/CMakeFiles/wwest-outreach-app.out.dir/all] Error 2
Makefile:83: recipe for target ‘all’ failed
make: *** [all] Error 2

Here is the link that I tried following:
Compiling a static executable with CMake

Note: I added following line and it compiled but not statically as I still cant open the output file (.out) on other linux machines.

set(CMAKE_EXE_LINKER_FLAGS "-static-libgcc -static-libstdc++")