Update cmake to allow C++ and fix maxos compile error

Signed-off-by: Anita Anderson <anita@ansan.io>

.editorconfig

@@ -0,0 +1,7 @@
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

CMakeLists.txt

@@ -1,21 +1,26 @@
 cmake_minimum_required(VERSION 3.21)
-project(Erythro C)
+project(Erythro C CXX)
 
 set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 include_directories(include)
 
-add_executable(Erythro
-        include/Data.h
-        include/Defs.h
-        src/Assembler.c
-        src/Delegate.c
-        src/Dump.c
-        src/Lexer.c
-        src/Main.c
-        src/Parser.c
-        src/Pointers.c
-        src/Statements.c
-        src/Symbols.c
-        src/Types.c
-        src/Importer.c)
+set(ERYTHRO_SRC
+  src/Assembler.c
+  src/Delegate.c
+  src/Dump.c
+  src/Lexer.c
+  src/Main.c
+  src/Parser.c
+  src/Pointers.c
+  src/Statements.c
+  src/Symbols.c
+  src/Types.c
+  src/Importer.c
+)
+
+add_executable(eryc ${ERYTHRO_SRC})

src/Importer.c

@@ -12,6 +12,11 @@
 #include <limits.h>
 #include <sys/stat.h>
 
+#ifdef __APPLE__
+#include <errno.h>
+#endif
+
+
 /**
  * The function of the importer is to read in definitions from a file, and store
  * them into the symbol tables.