Updated CMakeLists.txt to make building the GUI app optional

CMakeLists.txt

@@ -1,14 +1,6 @@
 cmake_minimum_required(VERSION 3.1)
 project(xtracer)
 
-set(OpenGL_GL_PREFERENCE GLVND)
-
-find_package(OpenGL REQUIRED)
-find_package(OpenSSL REQUIRED)
-find_package(GLEW REQUIRED)
-find_package(glfw3 3.2 REQUIRED)
-find_package(OpenMP REQUIRED)
-
 # PATHS
 set(PATH_ROOT ${CMAKE_SOURCE_DIR})
 set(PATH_SRC  ${PATH_ROOT}/src)
@@ -17,10 +9,6 @@ set(PATH_LIB  ${PATH_ROOT}/lib)
 set(PATH_EXT  ${PATH_ROOT}/ext)
 set(PATH_TEST ${PATH_BIN}/test)
 
-set(PATH_SRC_XTCORE       ${PATH_SRC}/xtcore)
-set(PATH_SRC_FRONTEND_CLI ${PATH_SRC}/frontend/cli)
-set(PATH_SRC_FRONTEND_GUI ${PATH_SRC}/frontend/gui)
-
 MACRO(SCAN_DIRS return_list)
     FILE(GLOB_RECURSE new_list *.h)
     SET(dir_list ${PATH_EXT})
@@ -39,21 +27,79 @@ execute_process(
     OUTPUT_STRIP_TRAILING_WHITESPACE
 )
 
+find_package(OpenMP REQUIRED)
+
+if(DEFINED ENV{XTRACER_ENABLE_GUI})
+    set(OpenGL_GL_PREFERENCE GLVND)
+
+    find_package(OpenGL REQUIRED)
+    find_package(OpenSSL REQUIRED)
+    find_package(GLEW REQUIRED)
+    find_package(glfw3 3.2 REQUIRED)
+
+    set(PATH_SRC_FRONTEND_GUI ${PATH_SRC}/frontend/gui)
+
+    file(GLOB SRC_FRONTEND_GUI
+        ${PATH_SRC_FRONTEND_GUI}/*.c
+        ${PATH_SRC_FRONTEND_GUI}/*.cc
+        ${PATH_SRC_FRONTEND_GUI}/*.cpp
+        ${PATH_SRC_FRONTEND_GUI}/*/*.c
+        ${PATH_SRC_FRONTEND_GUI}/*/*.cc
+        ${PATH_SRC_FRONTEND_GUI}/*/*.cpp
+    )
+
+    file(GLOB SRC_IMGUI
+        ${PATH_EXT}/imgui/*.cpp
+    )
+
+    set(OUT_EXE_GUI xtracer_gui)
+
+    add_library(imgui STATIC ${SRC_IMGUI})
+    set_target_properties(imgui PROPERTIES OUTPUT_NAME imgui)
+
+    add_executable(${OUT_EXE_GUI} ${SRC_FRONTEND_GUI})
+
+    target_include_directories(${OUT_EXE_GUI} PUBLIC
+        ${PATH_LIB}
+        ${PATH_SRC}
+        ${ext_libs}
+    )
+
+    add_dependencies (${OUT_EXE_GUI} xtcore_static xtcore_dynamic)
+    target_link_libraries(${OUT_EXE_GUI} PRIVATE xtcore_static remotery rtmidi asound pthread imgui ssl crypto GL glfw GLEW::GLEW ${OpenMP_LIBRARY})
+
+    install (TARGETS ${OUT_EXE_CLI}
+        RUNTIME DESTINATION bin
+        LIBRARY DESTINATION lib
+        ARCHIVE DESTINATION lib
+    )
+endif()
+
+set(PATH_SRC_XTCORE       ${PATH_SRC}/xtcore)
+set(PATH_SRC_FRONTEND_CLI ${PATH_SRC}/frontend/cli)
+
 SCAN_DIRS(ext_libs)
 
 set(IN_MAN_CLI  xtracer_cli.1)
 
 set(OUT_MAN_CLI xtracer_cli.1.gz)
 set(OUT_LIB     xtcore)
 set(OUT_EXE_CLI xtracer_cli)
-set(OUT_EXE_GUI xtracer_gui)
 
-set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PATH_BIN})
+set(iCMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PATH_BIN})
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PATH_BIN})
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PATH_BIN})
 set(CMAKE_FILES_DIRECTORY          ${PATH_BIN})
 set(CMAKE_CACHEFILE_DIR            ${PATH_BIN})
 
+file(GLOB SRC_REMOTERY
+    ${PATH_EXT}/remotery/lib/*.c
+)
+
+file(GLOB SRC_RTMIDI
+    ${PATH_EXT}/rtmidi/*.cpp    
+)
+
 file(GLOB SRC_LIBS
     ${PATH_LIB}/*/*.c
     ${PATH_LIB}/*/*.cc
@@ -78,42 +124,10 @@ file(GLOB SRC_FRONTEND_CLI
     ${PATH_SRC_FRONTEND_CLI}/*.cpp
 )
 
-file(GLOB SRC_FRONTEND_GUI
-    ${PATH_SRC_FRONTEND_GUI}/*.c
-    ${PATH_SRC_FRONTEND_GUI}/*.cc
-    ${PATH_SRC_FRONTEND_GUI}/*.cpp
-    ${PATH_SRC_FRONTEND_GUI}/*/*.c
-    ${PATH_SRC_FRONTEND_GUI}/*/*.cc
-    ${PATH_SRC_FRONTEND_GUI}/*/*.cpp
-)
-
-file(GLOB SRC_IMGUI
-    ${PATH_EXT}/imgui/*.cpp
-)
-
-file(GLOB SRC_REMOTERY
-    ${PATH_EXT}/remotery/lib/*.c
-)
-
-file(GLOB SRC_RTMIDI
-    ${PATH_EXT}/rtmidi/*.cpp
-)
-
 add_custom_target(manpages_cli
     gzip -c man/${IN_MAN_CLI} > ${PATH_BIN}/${OUT_MAN_CLI}
 )
 
-add_library(imgui STATIC ${SRC_IMGUI})
-set_target_properties(imgui PROPERTIES OUTPUT_NAME imgui)
-
-add_library(remotery STATIC ${SRC_REMOTERY})
-set_target_properties(remotery PROPERTIES OUTPUT_NAME remotery)
-set_target_properties(remotery PROPERTIES COMPILE_FLAGS "-std=gnu99 -I{PATH_EXT}/remotery/lib/ -pthread -lm")
-
-add_library(rtmidi STATIC ${SRC_RTMIDI})
-set_target_properties(rtmidi PROPERTIES OUTPUT_NAME rtmidi)
-set_target_properties(rtmidi PROPERTIES COMPILE_FLAGS "-I{PATH_EXT}/rtmidi/ -D__LINUX_ALSA__")
-
 add_library(xtcore_static  STATIC ${SRC_XTCORE} ${SRC_LIBS})
 set_target_properties(xtcore_static  PROPERTIES OUTPUT_NAME xtcore)
 
@@ -132,23 +146,23 @@ target_include_directories(xtcore_dynamic PUBLIC
     ${ext_libs}
 )
 
+add_library(remotery STATIC ${SRC_REMOTERY})
+set_target_properties(remotery PROPERTIES OUTPUT_NAME remotery)
+set_target_properties(remotery PROPERTIES COMPILE_FLAGS "-std=gnu99 -I{PATH_EXT}/remotery/lib/ -pthread -lm")
+
+add_library(rtmidi STATIC ${SRC_RTMIDI})
+set_target_properties(rtmidi PROPERTIES OUTPUT_NAME rtmidi)
+set_target_properties(rtmidi PROPERTIES COMPILE_FLAGS "-I{PATH_EXT}/rtmidi/ -D__LINUX_ALSA__")
+
 add_executable(${OUT_EXE_CLI} ${SRC_FRONTEND_CLI})
-add_executable(${OUT_EXE_GUI} ${SRC_FRONTEND_GUI})
 
 target_include_directories(${OUT_EXE_CLI} PUBLIC
     ${PATH_LIB}
     ${PATH_SRC}
     ${ext_libs}
 )
 
-target_include_directories(${OUT_EXE_GUI} PUBLIC
-    ${PATH_LIB}
-    ${PATH_SRC}
-    ${ext_libs}
-)
-
 target_link_libraries(${OUT_EXE_CLI} PRIVATE xtcore_static remotery rtmidi asound pthread)
-target_link_libraries(${OUT_EXE_GUI} PRIVATE xtcore_static remotery rtmidi asound pthread imgui ssl crypto GL glfw GLEW::GLEW ${OpenMP_LIBRARY})
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS} -std=c99")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS} -std=c++11 -Wall -Wextra -Wno-unknown-pragmas")
@@ -160,7 +174,6 @@ set(DEFS ${DEFS} XTCORE_VERSION="${DEF_VERSION}")
 target_compile_definitions(xtcore_static  PRIVATE ${DEFS})
 target_compile_definitions(xtcore_dynamic PRIVATE ${DEFS})
 add_dependencies (${OUT_EXE_CLI} xtcore_static xtcore_dynamic manpages_cli)
-add_dependencies (${OUT_EXE_GUI} xtcore_static xtcore_dynamic)
 
 enable_testing()
 file(MAKE_DIRECTORY ${PATH_TEST})
@@ -174,7 +187,13 @@ foreach(file ${files})
 endforeach()
 
 
-install (TARGETS ${OUT_EXE_CLI} ${OUT_EXE_GUI} xtcore_static xtcore_dynamic
+install (TARGETS xtcore_static xtcore_dynamic
+    RUNTIME DESTINATION bin
+    LIBRARY DESTINATION lib
+    ARCHIVE DESTINATION lib
+)
+
+install (TARGETS ${OUT_EXE_CLI}
     RUNTIME DESTINATION bin
     LIBRARY DESTINATION lib
     ARCHIVE DESTINATION lib