Arm backend: Build c/c++ code with -Wall -Werror (#11815)

This allows better detection of bad code.

Signed-off-by: Zingo Andersen <[email protected]>

Author: zingo

backends/arm/CMakeLists.txt

@@ -12,6 +12,8 @@ if(NOT EXECUTORCH_ROOT)
   set(EXECUTORCH_ROOT ${CMAKE_CURRENT_SOURCE_DIR}/../..)
 endif()
 
+add_compile_options("-Wall" "-Werror")
+
 include(${EXECUTORCH_ROOT}/tools/cmake/Utils.cmake)
 
 set(_common_include_directories ${EXECUTORCH_ROOT}/.. ${EXECUTORCH_ROOT}/runtime/core/portable_type/c10)

examples/arm/CMakeLists.txt

@@ -29,6 +29,8 @@ endif()
 
 set(_common_compile_options -Wno-deprecated-declarations -fPIC)
 
+add_compile_options("-Wall" "-Werror")
+
 # Let files say "include <executorch/path/to/header.h>".
 set(_common_include_directories ${EXECUTORCH_ROOT}/..)