Switch to isolated build flags per framework

builder/frameworks/_bare.py

@@ -0,0 +1,65 @@
+# Copyright 2014-present PlatformIO <contact@platformio.org>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+#
+# Default flags for bare-metal programming (without any framework layers)
+#
+
+from SCons.Script import Import
+
+Import("env")
+
+env.Append(
+    ASFLAGS=["-x", "assembler-with-cpp"],
+
+    CFLAGS=["-std=gnu99"],
+
+    CCFLAGS=[
+        "-Os",
+        "-Wall",
+        "-nostdlib",
+        "-Wpointer-arith",
+        "-Wno-error=unused-but-set-variable",
+        "-Wno-error=unused-variable",
+        "-mlongcalls",
+        "-ffunction-sections",
+        "-fdata-sections",
+        "-fstrict-volatile-bitfields"
+    ],
+
+    CXXFLAGS=[
+        "-fno-rtti",
+        "-fno-exceptions",
+        "-std=gnu++11"
+    ],
+
+    CPPDEFINES=[
+        "ESP32",
+        "ESP_PLATFORM",
+        ("F_CPU", "$BOARD_F_CPU"),
+        "HAVE_CONFIG_H",
+        ("MBEDTLS_CONFIG_FILE", '\\"mbedtls/esp_config.h\\"')
+    ],
+
+    LINKFLAGS=[
+        "-nostdlib",
+        "-Wl,-static",
+        "-u", "call_user_start_cpu0",
+        "-Wl,--undefined=uxTopUsedPriority",
+        "-Wl,--gc-sections"
+    ]
+)
+
+# copy CCFLAGS to ASFLAGS (-x assembler-with-cpp mode)
+env.Append(ASFLAGS=env.get("CCFLAGS", [])[:])

builder/frameworks/espidf.py

@@ -32,6 +32,7 @@ from SCons.Script import DefaultEnvironment
 env = DefaultEnvironment()
 platform = env.PioPlatform()
 
+env.SConscript("_bare.py", exports="env")
 env.SConscript("_embedtxt_files.py", exports="env")
 
 FRAMEWORK_DIR = platform.get_package_dir("framework-espidf")

builder/main.py

@@ -141,45 +141,6 @@ env.Replace(
 
     ARFLAGS=["rc"],
 
-    ASFLAGS=["-x", "assembler-with-cpp"],
-
-    CFLAGS=["-std=gnu99"],
-
-    CCFLAGS=[
-        "-Os",
-        "-Wall",
-        "-nostdlib",
-        "-Wpointer-arith",
-        "-Wno-error=unused-but-set-variable",
-        "-Wno-error=unused-variable",
-        "-mlongcalls",
-        "-ffunction-sections",
-        "-fdata-sections",
-        "-fstrict-volatile-bitfields"
-    ],
-
-    CXXFLAGS=[
-        "-fno-rtti",
-        "-fno-exceptions",
-        "-std=gnu++11"
-    ],
-
-    CPPDEFINES=[
-        "ESP32",
-        "ESP_PLATFORM",
-        ("F_CPU", "$BOARD_F_CPU"),
-        "HAVE_CONFIG_H",
-        ("MBEDTLS_CONFIG_FILE", '\\"mbedtls/esp_config.h\\"')
-    ],
-
-    LINKFLAGS=[
-        "-nostdlib",
-        "-Wl,-static",
-        "-u", "call_user_start_cpu0",
-        "-Wl,--undefined=uxTopUsedPriority",
-        "-Wl,--gc-sections"
-    ],
-
     SIZEPROGREGEXP=r"^(?:\.iram0\.text|\.iram0\.vectors|\.dram0\.data|\.flash\.text|\.flash\.rodata|)\s+([0-9]+).*",
     SIZEDATAREGEXP=r"^(?:\.dram0\.data|\.dram0\.bss|\.noinit)\s+([0-9]+).*",
     SIZECHECKCMD="$SIZETOOL -A -d $SOURCES",
@@ -194,8 +155,9 @@ if env.get("PROGNAME", "program") == "program":
     env.Replace(PROGNAME="firmware")
 
 env.Append(
-    # Clone actual CCFLAGS to ASFLAGS
+    # copy CCFLAGS to ASFLAGS (-x assembler-with-cpp mode)
     ASFLAGS=env.get("CCFLAGS", [])[:],
+
     BUILDERS=dict(
         ElfToBin=Builder(
             action=env.VerboseAction(" ".join([
@@ -208,7 +170,8 @@ env.Append(
                     "upload.flash_size", "detect"),
                 "-o", "$TARGET", "$SOURCES"
             ]), "Building $TARGET"),
-            suffix=".bin"),
+            suffix=".bin"
+        ),
         DataToBin=Builder(
             action=env.VerboseAction(" ".join([
                 '"$MKSPIFFSTOOL"',
@@ -220,7 +183,13 @@ env.Append(
             ]), "Building SPIFFS image from '$SOURCES' directory to $TARGET"),
             emitter=__fetch_spiffs_size,
             source_factory=env.Dir,
-            suffix=".bin")))
+            suffix=".bin"
+        )
+    )
+)
+
+if not env.get("PIOFRAMEWORK"):
+    env.SConscript("frameworks/_bare.py", exports="env")
 
 #
 # Target: Build executable and linkable firmware or SPIFFS image

platform.json

@@ -45,7 +45,7 @@
     "framework-arduinoespressif32": {
       "type": "framework",
       "optional": true,
-      "version": "~1.10000.0"
+      "version": "~2.10000.0"
     },
     "framework-espidf": {
       "type": "framework",