Fixed bug causing single-supported architecture libraries to fail.

Also added the 3rd party library 'LiquidCrystal_I2C' which has an inner dependency on the 'Wire' platform library.

Author: MrPointer

cmake/Platform/Other/ArchitectureSupportQuery.cmake

@@ -42,10 +42,14 @@ function(get_unsupported_architectures _arch_list _return_var)
     list(FILTER _arch_list EXCLUDE REGEX ${ARDUINO_CMAKE_PLATFORM_ARCHITECTURE})
     set(unsupported_arch_list ${_arch_list}) # Just for better readability
 
+    if (NOT unsupported_arch_list) # The only supported architecture is our platform's architecture
+        return() # Return nothing as there are no uspported architectures
+    endif ()
+
     if (parsed_args_REGEX) # Return in regex format         
 
         foreach (arch ${unsupported_arch_list})
-            # Append every unsupported-architecture and "|" to represent "or" in regex-fomart
+            # Append an "|" to every unsupported-architecture to represent "or" in regex-fomart
             string(APPEND unsupported_archs_regex "${arch}" "|")
         endforeach ()
 

examples/3rd-party-library/3rd_party.cpp

@@ -1,11 +1,13 @@
 #include <Arduino.h>
 #include "NeoPixelTest.hpp"
 #include "GFXTest.h"
+#include "LiquidCrystalTest.hpp"
 
 void setup()
 {
     testNeoPixel();
     testGFX();
+    testLiquidCrystal();
 }
 
 void loop()

examples/3rd-party-library/CMakeLists.txt

@@ -5,7 +5,7 @@ get_board_id(board_id nano atmega328)
 
 # First, declare and create our executable - It'll use 4 sources
 add_arduino_executable(3rd_Party_Arduino_Library ${board_id} 3rd_party.cpp
-        NeoPixelTest.cpp GFXTest.cpp)
+        NeoPixelTest.cpp GFXTest.cpp LiquidCrystalTest.cpp)
 target_include_directories(3rd_Party_Arduino_Library PRIVATE include)
 
 # Add the "NeoPixel" library manually using the library addition API
@@ -21,7 +21,10 @@ target_source_directories(adafruit_GFX DIRS libraries/Adafruit-GFX-Library/Fonts
 # We can even automatically find a library that doesn't have a properties file!
 find_arduino_library(sky_writer Skywriter ${board_id} 3RD_PARTY)
 
+find_arduino_library(liquidCrystal LiquidCrystal_I2C ${board_id} 3RD_PARTY)
+
 # Link all libraries to our previously created target
 link_arduino_library(3rd_Party_Arduino_Library adafruit_NeoPixel ${board_id})
 link_arduino_library(3rd_Party_Arduino_Library adafruit_GFX ${board_id})
 link_arduino_library(3rd_Party_Arduino_Library sky_writer ${board_id})
+link_arduino_library(3rd_Party_Arduino_Library liquidCrystal ${board_id})

examples/3rd-party-library/LiquidCrystalTest.cpp

@@ -0,0 +1,9 @@
+#include "LiquidCrystalTest.hpp"
+
+LiquidCrystal_I2C lcd(LCD_ADDRESS, LCD_COLUMNS, LCD_ROWS);
+
+void testLiquidCrystal()
+{
+    lcd.begin(LCD_COLUMNS, LCD_ROWS);
+    lcd.clear();
+}

examples/3rd-party-library/include/LiquidCrystalTest.hpp

@@ -0,0 +1,13 @@
+#ifndef EXAMPLES_LIQUIDCRYSTALTEST_HPP
+#define EXAMPLES_LIQUIDCRYSTALTEST_HPP
+
+#include <LiquidCrystal_I2C.h>
+#include <Arduino.h>
+
+#define LCD_ADDRESS     0x27
+#define LCD_COLUMNS     20
+#define LCD_ROWS        4
+
+void testLiquidCrystal();
+
+#endif //EXAMPLES_LIQUIDCRYSTALTEST_HPP