started updating examples for cmake v3 syntax

01-basic/G-compile-flags/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 3.0)
 
 # Set a default C++ compile flag
 set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DEX2" CACHE STRING "Set C++ Compiler Flags" FORCE)
@@ -8,3 +8,7 @@ project (compile_flags)
 
 # Add an executable
 add_executable(cmake_examples_compile_flags main.cpp)
+
+target_compile_defintions(cmake_examples_compile_flags 
+    PRIVATE EX3
+)

01-basic/G-compile-flags/README.adoc

@@ -26,7 +26,7 @@ $ tree
 
 ## Set C++ Flag
 
-Similar to the build type a C++ compiler flag can be set using the following methods.
+Similar to the build type a global C++ compiler flag can be set using the following methods.
 
   - Using a gui tool such as ccmake / cmake-gui
 
@@ -60,6 +60,19 @@ are used to force this variable to be set in the CMakeCache.txt file.
 For more details, see https://cmake.org/cmake/help/v3.0/command/set.html[here]
 ====
 
+## Set Per-Target C++ Flags
+
+Once set the +CMAKE_C_FLAGS+ and +CMAKE_CXX_FLAGS+ will set a compler flag / definiton globally for all targets in this directory or any included sub-directories. To set a compiler definitons for a specific target you can use the +target_compile_defintions()+ link:https://cmake.org/cmake/help/v3.0/command/target_compile_definitions.html[function]. This will cause the compiler to add the definition +-DEX3+ when compiling the target.
+
+[source,cmake]
+----
+target_compile_defintions(cmake_examples_compile_flags
+    PRIVATE EX3
+)
+----
+
+Depending on the scope this defintion may also be included in any targets that link this target. For compiler options you can also use the +target_compile_options()+ link:https://cmake.org/cmake/help/v3.0/command/target_compile_options.html[function].
+
 # Building the Example
 
 [source,bash]