Add Bazel build file implementation (#419)

bazel/flags.bzl

@@ -0,0 +1,45 @@
+"""
+Compilation flags related to all targets.
+Applies to objective-c files that can't take the added CPP_FLAGS.
+Included in the CPP flags below.
+"""
+
+WARNING_FLAGS = [
+    "-Wall",
+    "-Werror",
+    "-Wextra",
+    "-Wno-c++11-narrowing",
+    "-Wno-gnu-anonymous-struct",
+    "-Wno-pointer-to-int-cast",
+    "-Wno-tautological-constant-compare",
+    "-Wno-unused-parameter",
+    "-Wno-unused-variable",
+    "-Wno-variadic-macros",
+    "-Wno-nested-anon-types",
+    "-Wno-newline-eof",
+]
+
+"""
+Compilation flags used for all .cpp and .mm targets.
+"""
+
+CPP_FLAGS = WARNING_FLAGS + [
+    "-fexceptions",
+    "-frtti",
+    "-ftemplate-depth=1024",
+    "-std=c++14",
+]
+
+"""
+Compilation flags related to the Maplibre codebase. Relevant for all .cpp .mm and .m code
+ - src/*
+ - include/*
+ - platform/*
+Not important for any vendors that are imported.
+"""
+
+MAPLIBRE_FLAGS = [
+    "-DMBGL_USE_GLES2=1",
+    "-DMBGL_RENDER_BACKEND_OPENGL=1",
+    "-DGLES_SILENCE_DEPRECATION",
+]