Compile IDF bootloader with optimizations by default

By default the size of bootloader is limited to 0x2000 bytes,
in debug mode the footprint can be easily grow beyond this limit

Issue platformio#793

Author: valeros

builder/frameworks/espidf.py

@@ -273,13 +273,15 @@ def load_target_configurations(cmake_codemodel, cmake_api_reply_dir):
     return configs
 
 
-def build_library(default_env, lib_config, project_src_dir, prepend_dir=None):
+def build_library(
+    default_env, lib_config, project_src_dir, prepend_dir=None, debug_allowed=True
+):
     lib_name = lib_config["nameOnDisk"]
     lib_path = lib_config["paths"]["build"]
     if prepend_dir:
         lib_path = os.path.join(prepend_dir, lib_path)
     lib_objects = compile_source_files(
-        lib_config, default_env, project_src_dir, prepend_dir
+        lib_config, default_env, project_src_dir, prepend_dir, debug_allowed
     )
     return default_env.Library(
         target=os.path.join("$BUILD_DIR", lib_path, lib_name), source=lib_objects
@@ -553,11 +555,11 @@ def generate_project_ld_script(sdk_config, ignore_targets=None):
     )
 
 
-def prepare_build_envs(config, default_env):
+def prepare_build_envs(config, default_env, debug_allowed=True):
     build_envs = []
     target_compile_groups = config.get("compileGroups")
 
-    is_build_type_debug = "debug" in env.GetBuildType()
+    is_build_type_debug = "debug" in env.GetBuildType() and debug_allowed
     for cg in target_compile_groups:
         includes = []
         sys_includes = []
@@ -587,8 +589,8 @@ def prepare_build_envs(config, default_env):
     return build_envs
 
 
-def compile_source_files(config, default_env, project_src_dir, prepend_dir=None):
-    build_envs = prepare_build_envs(config, default_env)
+def compile_source_files(config, default_env, project_src_dir, prepend_dir=None, debug_allowed=True):
+    build_envs = prepare_build_envs(config, default_env, debug_allowed)
     objects = []
     components_dir = fs.to_unix_path(os.path.join(FRAMEWORK_DIR, "components"))
     for source in config.get("sources", []):
@@ -703,7 +705,7 @@ def find_lib_deps(components_map, elf_config, link_args, ignore_components=None)
     return result
 
 
-def build_bootloader():
+def build_bootloader(sdk_config):
     bootloader_src_dir = os.path.join(
         FRAMEWORK_DIR, "components", "bootloader", "subproject"
     )
@@ -743,7 +745,15 @@ def build_bootloader():
         target_configs, ["STATIC_LIBRARY", "OBJECT_LIBRARY"]
     )
 
-    build_components(bootloader_env, components_map, bootloader_src_dir, "bootloader")
+    # Note: By default the size of bootloader is limited to 0x2000 bytes,
+    # in debug mode the footprint size can be easily grow beyond this limit
+    build_components(
+        bootloader_env,
+        components_map,
+        bootloader_src_dir,
+        "bootloader",
+        debug_allowed=sdk_config.get("BOOTLOADER_COMPILER_OPTIMIZATION_DEBUG", False),
+    )
     link_args = extract_link_args(elf_config)
     extra_flags = filter_args(link_args["LINKFLAGS"], ["-T", "-u"])
     link_args["LINKFLAGS"] = sorted(
@@ -788,10 +798,12 @@ def get_components_map(target_configs, target_types, ignore_components=None):
     return result
 
 
-def build_components(env, components_map, project_src_dir, prepend_dir=None):
+def build_components(
+    env, components_map, project_src_dir, prepend_dir=None, debug_allowed=True
+):
     for k, v in components_map.items():
         components_map[k]["lib"] = build_library(
-            env, v["config"], project_src_dir, prepend_dir
+            env, v["config"], project_src_dir, prepend_dir, debug_allowed
         )
 
 
@@ -1232,7 +1244,7 @@ def _get_installed_pip_packages():
 # Compile bootloader
 #
 
-env.Depends("$BUILD_DIR/$PROGNAME$PROGSUFFIX", build_bootloader())
+env.Depends("$BUILD_DIR/$PROGNAME$PROGSUFFIX", build_bootloader(sdk_config))
 
 #
 # Target: ESP-IDF menuconfig