Merge branch 'ci/additional_compiler_errors' into 'master'

ci: Add additional compiler errors

Closes ESF-59

See merge request espressif/esp-serial-flasher!70

.gitlab-ci.yml

@@ -27,7 +27,7 @@ variables:
     - build
     - internet
   variables:
-    PEDANTIC_FLAGS: "-Werror -Werror=deprecated-declarations -Werror=unused-variable -Werror=unused-but-set-variable -Werror=unused-function"
+    PEDANTIC_FLAGS: "-Werror=all -Werror=extra"
     EXTRA_CFLAGS: "${PEDANTIC_FLAGS}"
     EXTRA_CXXFLAGS: "${PEDANTIC_FLAGS}"
   script: