CI: add more build warning checks and force them to error.

Add CMAKE_C_FLAGS warnings to highlight potential issue:
"-Wall -Wextra -Wshadow -Wunused-but-set-variable"
And force warning as error with "-Werror"

Signed-off-by: Arnaud Pouliquen <[email protected]>

.github/actions/build_ci/entrypoint.sh

@@ -28,12 +28,15 @@ build_linux(){
 	pwd || exit 1
 	ls -l || exit 1
 	cd libmetal || exit 1
-	cmake . -Bbuild || exit 1
+	cmake . -Bbuild \
+	-DCMAKE_C_FLAGS="-Werror -Wall -Wextra -Wshadow -Wunused-but-set-variable" || exit 1
 	cd build || exit 1
 	make || exit 1
 	export || exit 1
 	cd ../.. || exit 1
-	cmake . -Bbuild -DWITH_APPS=on -DWITH_PROXY=on -DCMAKE_INCLUDE_PATH="./libmetal/build/lib/include" -DCMAKE_LIBRARY_PATH="./libmetal/build/lib" || exit 1
+	cmake . -Bbuild -DCMAKE_C_FLAGS="-Werror -Wall -Wextra -Wshadow -Wunused-but-set-variable" \
+	-DWITH_APPS=on -DWITH_PROXY=on -DCMAKE_INCLUDE_PATH="./libmetal/build/lib/include"  \
+	-DCMAKE_LIBRARY_PATH="./libmetal/build/lib" || exit 1
 	cd build || exit 1
 	make VERBOSE=1 all || exit 1
 	exit 0
@@ -43,11 +46,16 @@ build_generic(){
 	echo  " Build for generic platform "
 	apt-get install -y gcc-arm-none-eabi || exit 1
 	cd libmetal || exit 1
-	cmake . -Bbuild-generic -DCMAKE_TOOLCHAIN_FILE=template-generic || exit 1
+	cmake . -Bbuild-generic -DCMAKE_TOOLCHAIN_FILE=template-generic \
+	-DCMAKE_C_FLAGS="-Werror -Wall -Wextra -Wshadow -Wunused-but-set-variable" || exit 1
 	cd build-generic || exit 1
 	make VERBOSE=1 || exit 1
 	cd ../../ || exit 1
-	cmake . -Bbuild-generic -DCMAKE_TRY_COMPILE_TARGET_TYPE="STATIC_LIBRARY" -DCMAKE_C_FLAGS="" -DCMAKE_SYSTEM_PROCESSOR="arm" -DCMAKE_C_COMPILER=arm-none-eabi-gcc -DCMAKE_INCLUDE_PATH="./libmetal/build-generic/lib/include" -DCMAKE_LIBRARY_PATH="./libmetal/build-generic/lib" || exit 1
+	cmake . -Bbuild-generic -DCMAKE_TRY_COMPILE_TARGET_TYPE="STATIC_LIBRARY" \
+	-DCMAKE_C_FLAGS="-Werror -Wall -Wextra -Wshadow -Wunused-but-set-variable" \
+	-DCMAKE_SYSTEM_PROCESSOR="arm" -DCMAKE_C_COMPILER=arm-none-eabi-gcc \
+	-DCMAKE_INCLUDE_PATH="./libmetal/build-generic/lib/include" \
+	-DCMAKE_LIBRARY_PATH="./libmetal/build-generic/lib" || exit 1
 	cd build-generic || exit 1
 	make VERBOSE=1 || exit 1
 	exit 0