Revert "remove submodules (replaced with FetchContent)"

This reverts commit 5384e9d.

Author: NikolasK-source

.gitmodules

@@ -1,3 +1,12 @@
+[submodule "libs/cxxopts"]
+	path = libs/cxxopts
+	url = https://github.com/NikolasK-source/cxxopts.git
 [submodule "libs/libmodbus"]
 	path = libs/libmodbus
 	url = https://github.com/stephane/libmodbus
+[submodule "libs/cxxshm"]
+	path = libs/cxxshm
+	url = https://github.com/NikolasK-source/cxxshm.git
+[submodule "libs/cxxsemaphore"]
+	path = libs/cxxsemaphore
+	url = https://github.com/NikolasK-source/cxxsemaphore.git

libs/CMakeLists.txt

@@ -2,47 +2,17 @@
 # ---------------------------------------- subdirectories --------------------------------------------------------------
 # ======================================================================================================================
 include(../modbus.cmake)
-
-
-# ---------------------------------------- fetch content ---------------------------------------------------------------
-# ======================================================================================================================
-include(FetchContent)
-
-# cxxopts (jarro2783)
-FetchContent_Declare(
-        cxxopts
-        GIT_REPOSITORY https://github.com/jarro2783/cxxopts.git
-        GIT_TAG v3.2.0
-        EXCLUDE_FROM_ALL
-)
-
-set(CXXOPTS_STANDALONE_PROJECT ON CACHE BOOL "" FORCE)
-FetchContent_MakeAvailable(cxxopts)
-
-# cxxshm
-FetchContent_Declare(
-        cxxshm
-        GIT_REPOSITORY https://github.com/NikolasK-source/cxxshm.git
-        GIT_TAG v1.1.0
-        EXCLUDE_FROM_ALL
-)
-
-FetchContent_MakeAvailable(cxxshm)
-
-# cxxsemaphore
-FetchContent_Declare(
-        cxxsemaphore
-        GIT_REPOSITORY https://github.com/NikolasK-source/cxxsemaphore.git
-        GIT_TAG v1.0.1
-        EXCLUDE_FROM_ALL
-)
-
-FetchContent_MakeAvailable(cxxsemaphore)
+target_link_libraries(${Target} PRIVATE modbus)
 
 # ---------------------------------------- link libraries --------------------------------------------------------------
 # ======================================================================================================================
-target_link_libraries(${Target} PRIVATE modbus)
 target_link_libraries(${Target} PRIVATE rt)
+
+add_subdirectory(cxxopts EXCLUDE_FROM_ALL)
 target_link_libraries(${Target} PRIVATE cxxopts)
+
+add_subdirectory(cxxshm EXCLUDE_FROM_ALL)
 target_link_libraries(${Target} PRIVATE cxxshm)
+
+add_subdirectory(cxxsemaphore EXCLUDE_FROM_ALL)
 target_link_libraries(${Target} PRIVATE cxxsemaphore)

libs/cxxopts

@@ -184,7 +184,7 @@ int main(int argc, char **argv) {
     cxxopts::ParseResult args;
     try {
         args = options.parse(argc, argv);
-    } catch (cxxopts::exceptions::exception &e) {
+    } catch (cxxopts::OptionParseException &e) {
         std::cerr << Print_Time::iso << " ERROR: Failed to parse arguments: " << e.what() << ".'\n";
         return exit_usage();
     }