Move -Wall CFLAGS to toplevel and change the way it works

This should let env CFLAGS override -O2 while forcing -Wall

Signed-off-by: Hector Martin <hector@marcansoft.com>

Author: marcan

CMakeLists.txt

@@ -91,6 +91,12 @@ SET(EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR}/bin)
 SET(LIBRARY_OUTPUT_PATH ${CMAKE_BINARY_DIR}/lib)
 SET(DOC_OUTPUT_PATH ${CMAKE_BINARY_DIR}/doc)
 
+# let CFLAGS env override this
+if(CMAKE_C_FLAGS STREQUAL "")
+  set(CMAKE_C_FLAGS "-O2")
+endif()
+add_definitions(-Wall)
+
 # Pretty much everyone is going to need the main includes
 include_directories (${CMAKE_CURRENT_SOURCE_DIR}/include)
 

src/CMakeLists.txt

@@ -4,7 +4,6 @@
 
 include_directories (${CMAKE_CURRENT_SOURCE_DIR})
 
-set(CMAKE_C_FLAGS "-Wall")
 include_directories(${LIBUSB_1_INCLUDE_DIRS})
 LIST(APPEND SRC core.c tilt.c cameras.c usb_libusb10.c)