common cmake files moved to example_common

cmake/common.cmake

@@ -0,0 +1,42 @@
+function(get_common_build_flags TGT_NAME)
+  if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+      set(COMMON_COMPILE_OPTS
+        -ffunction-sections
+        -fdata-sections
+        PARENT_SCOPE)
+      set(COMMON_LINK_OPTS
+        -Wl,--gc-sections
+        -Wl,-Map=${TARGET_NAME}.map
+        PARENT_SCOPE)
+      set(COMMON_WARNING_FLAGS
+        -Wall
+        -Wextra
+        -Wimplicit-fallthrough=1
+        -Wno-unused-parameter
+        -Wno-psabi
+        -Wduplicated-cond # check for duplicate conditions
+        -Wduplicated-branches # check for duplicate branches
+        -Wlogical-op # Search for bitwise operations instead of logical
+        -Wnull-dereference # Search for NULL dereference
+        -Wundef # Warn if undefind marcos are used
+        -Wformat=2 # Format string problem detection
+        -Wformat-overflow=2 # Formatting issues in printf
+        -Wformat-truncation=2 # Formatting issues in printf
+        -Wformat-security # Search for dangerous printf operations
+        -Wstrict-overflow=3 # Warn if integer overflows might happen
+        -Warray-bounds=2 # Some array bounds violations will be found
+        -Wshift-overflow=2 # Search for bit left shift overflows (<c++14)
+        -Wcast-qual # Warn if the constness is cast away
+        -Wstringop-overflow=4
+        # -Wstack-protector # Emits a few false positives for low level access
+        # -Wconversion # Creates many false positives -Warith-conversion # Use
+        # with Wconversion to find more implicit conversions -fanalyzer # Should
+        # be used to look through problems
+        PARENT_SCOPE)
+  elseif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+    add_compile_options(/permissive- /d2SSAOptimizer-)
+    # To avoid nameclashes with min and max macro
+    add_compile_definitions(NOMINMAX)
+  endif()
+
+endfunction()