feat(kconfig): update global "Kconfig" and its dependent compiling sc…

…ript

Kconfig

@@ -4,165 +4,197 @@
 #
 mainmenu "Espressif IoT Development Framework Configuration"
 
-choice IDF_TARGET
-   bool "Espressif target platform choose"
-   default IDF_TARGET_ESP8266
-   help
-       Choose the specific target platform which you will use.
-
-config IDF_TARGET_ESP8266
-   bool "esp8266"
-endchoice
-
-config IDF_TARGET
-    string
-    default "esp8266" if IDF_TARGET_ESP8266
-
-menu "SDK tool configuration"
-config SDK_TOOLPREFIX
-    string
-    default "xtensa-lx106-elf-" if IDF_TARGET_ESP8266
-    help
-        The prefix/path that is used to call the toolchain. The default setting assumes
-        a crosstool-ng gcc setup that is in your PATH.
-
-config PYTHON
-    string "Python 2 interpreter"
-    default "python"
-    help
-        The executable name/path that is used to run python. On some systems Python 2.x
-        may need to be invoked as python2.
-
-config MAKE_WARN_UNDEFINED_VARIABLES
-    bool "'make' warns on undefined variables"
-    default "y"
-    help
-        Adds --warn-undefined-variables to MAKEFLAGS. This causes make to
-        print a warning any time an undefined variable is referenced.
-
-        This option helps find places where a variable reference is misspelled
-        or otherwise missing, but it can be unwanted if you have Makefiles which
-        depend on undefined variables expanding to an empty string.
-
-endmenu  # SDK tool configuration
-
-source "$COMPONENT_KCONFIGS_PROJBUILD"
-
-menu "Compiler options"
-
-choice OPTIMIZATION_COMPILER
-    prompt "Optimization Level"
-    default OPTIMIZATION_LEVEL_DEBUG
-    help
-        This option sets compiler optimization level (gcc -O argument).
-
-        - for "Release" setting, -Os flag is added to CFLAGS.
-        - for "Debug" setting, -Og flag is added to CFLAGS.
-
-        "Release" with -Os produces smaller & faster compiled code but it
-        may be harder to correlated code addresses to source files when debugging.
-
-        To add custom optimization settings, set CFLAGS and/or CPPFLAGS
-        in project makefile, before including $(IDF_PATH)/make/project.mk. Note that
-        custom optimization levels may be unsupported.
-
-config OPTIMIZATION_LEVEL_DEBUG
-    bool "Debug (-Og)"
-config OPTIMIZATION_LEVEL_RELEASE
-    bool "Release (-Os)"
-endchoice
-
-choice OPTIMIZATION_ASSERTION_LEVEL
-    prompt "Assertion level"
-    default OPTIMIZATION_ASSERTIONS_ENABLED
-    help
-        Assertions can be:
-        - Enabled. Failure will print verbose assertion details. This is the default.
-
-        - Set to "silent" to save code size (failed assertions will abort() but user
-          needs to use the aborting address to find the line number with the failed assertion.)
-
-        - Disabled entirely (not recommended for most configurations.) -DNDEBUG is added
-          to CPPFLAGS in this case.
-
-config OPTIMIZATION_ASSERTIONS_ENABLED
-    prompt "Enabled"
-    bool
-    help
-        Enable assertions. Assertion content and line number will be printed on failure.
-
-config OPTIMIZATION_ASSERTIONS_SILENT
-    prompt "Silent (saves code size)"
-    bool
-    help
-        Enable silent assertions. Failed assertions will abort(), user needs to
-        use the aborting address to find the line number with the failed assertion.
-
-config OPTIMIZATION_ASSERTIONS_DISABLED
-    prompt "Disabled (sets -DNDEBUG)"
-    bool
-    help
-        If assertions are disabled, -DNDEBUG is added to CPPFLAGS.
-
-endchoice # assertions
-
-menuconfig CXX_EXCEPTIONS
-   bool "Enable C++ exceptions"
-   default n
-   help
-       Enabling this option compiles all IDF C++ files with exception support enabled.
-
-       Disabling this option disables C++ exception support in all compiled files, and any libstdc++ code which throws
-       an exception will abort instead.
-
-       Enabling this option currently adds an additional ~500 bytes of heap overhead
-       when an exception is thrown in user code for the first time.
-
-config CXX_EXCEPTIONS_EMG_POOL_SIZE
-    int "Emergency Pool Size"
-    default 0
-    depends on CXX_EXCEPTIONS
-    help
-       Size (in bytes) of the emergency memory pool for C++ exceptions. This pool will be used to allocate
-       memory for thrown exceptions when there is not enough memory on the heap.
-
-choice STACK_CHECK_MODE
-    prompt "Stack smashing protection mode"
-    default STACK_CHECK_NONE
-    help
-        Stack smashing protection mode. Emit extra code to check for buffer overflows, such as stack
-        smashing attacks. This is done by adding a guard variable to functions with vulnerable objects.
-        The guards are initialized when a function is entered and then checked when the function exits.
-        If a guard check fails, program is halted. Protection has the following modes:
-          - In NORMAL mode (GCC flag: -fstack-protector) only functions that call alloca, and functions with buffers larger than
-            8 bytes are protected.
-          - STRONG mode (GCC flag: -fstack-protector-strong) is like NORMAL, but includes additional functions to be protected -- those that
-            have local array definitions, or have references to local frame addresses.
-          - In OVERALL mode (GCC flag: -fstack-protector-all) all functions are protected.
-
-        Modes have the following impact on code performance and coverage:
-          - performance: NORMAL > STRONG > OVERALL
-          - coverage: NORMAL < STRONG < OVERALL
-
-
-config STACK_CHECK_NONE
-    bool "None"
-config STACK_CHECK_NORM
-    bool "Normal"
-config STACK_CHECK_STRONG
-    bool "Strong"
-config STACK_CHECK_ALL
-    bool "Overall"
-endchoice
-
-config STACK_CHECK
-    bool
-    default !STACK_CHECK_NONE
-    help
-        Stack smashing protection.
-
-endmenu # Compiler Options
-
-menu "Component config"
-source "$COMPONENT_KCONFIGS"
-endmenu
+    # Hidden option to support checking for this specific target in C code and Kconfig files
+    config IDF_TARGET_ESP8266
+        bool
+        default "y" if IDF_TARGET="esp8266"
+        default "n"
+
+    config IDF_CMAKE
+        bool
+        option env="IDF_CMAKE"
+
+
+    config IDF_TARGET_ENV
+        # A proxy to get environment variable $IDF_TARGET
+        string
+        option env="IDF_TARGET"
+
+    config IDF_TARGET
+        # This option records the IDF target when sdkconfig is generated the first time.
+        # It is not updated if environment variable $IDF_TARGET changes later, and
+        # the build system is responsible for detecting the mismatch between
+        # CONFIG_IDF_TARGET and $IDF_TARGET.
+        string
+        default "IDF_TARGET_NOT_SET" if IDF_TARGET_ENV=""
+        default IDF_TARGET_ENV
+
+
+    menu "SDK tool configuration"
+        config SDK_TOOLPREFIX
+            string "Compiler toolchain path/prefix"
+            default "xtensa-lx106-elf-"
+            help
+                The prefix/path that is used to call the toolchain. The default setting assumes
+                a crosstool-ng gcc setup that is in your PATH.
+
+        config SDK_PYTHON
+            string "Python 2 interpreter"
+            depends on !IDF_CMAKE
+            default "python"
+            help
+                The executable name/path that is used to run python. On some systems Python 2.x
+                may need to be invoked as python2.
+
+                (Note: This option is used with the legacy GNU Make build system only.)
+
+        config SDK_MAKE_WARN_UNDEFINED_VARIABLES
+            bool "'make' warns on undefined variables"
+            depends on !IDF_CMAKE
+            default "n"
+            help
+                Adds --warn-undefined-variables to MAKEFLAGS. This causes make to
+                print a warning any time an undefined variable is referenced.
+
+                This option helps find places where a variable reference is misspelled
+                or otherwise missing, but it can be unwanted if you have Makefiles which
+                depend on undefined variables expanding to an empty string.
+
+                (Note: this option is used with the legacy GNU Make build system only.)
+
+    endmenu  # SDK tool configuration
+
+    source "$COMPONENT_KCONFIGS_PROJBUILD"
+
+    menu "Compiler options"
+
+        choice COMPILER_OPTIMIZATION
+            prompt "Optimization Level"
+            default COMPILER_OPTIMIZATION_LEVEL_DEBUG
+            help
+                This option sets compiler optimization level (gcc -O argument).
+
+                - for "Release" setting, -Os flag is added to CFLAGS.
+                - for "Debug" setting, -Og flag is added to CFLAGS.
+
+                "Release" with -Os produces smaller & faster compiled code but it
+                may be harder to correlated code addresses to source files when debugging.
+
+                To add custom optimization settings, set CFLAGS and/or CPPFLAGS
+                in project makefile, before including $(IDF_PATH)/make/project.mk. Note that
+                custom optimization levels may be unsupported.
+
+            config COMPILER_OPTIMIZATION_LEVEL_DEBUG
+                bool "Debug (-Og)"
+            config COMPILER_OPTIMIZATION_LEVEL_RELEASE
+                bool "Release (-Os)"
+        endchoice
+
+        choice COMPILER_OPTIMIZATION_ASSERTION_LEVEL
+            prompt "Assertion level"
+            default COMPILER_OPTIMIZATION_ASSERTIONS_ENABLE
+            help
+                Assertions can be:
+
+                - Enabled. Failure will print verbose assertion details. This is the default.
+
+                - Set to "silent" to save code size (failed assertions will abort() but user
+                  needs to use the aborting address to find the line number with the failed assertion.)
+
+                - Disabled entirely (not recommended for most configurations.) -DNDEBUG is added
+                  to CPPFLAGS in this case.
+
+            config COMPILER_OPTIMIZATION_ASSERTIONS_ENABLE
+                prompt "Enabled"
+                bool
+                help
+                    Enable assertions. Assertion content and line number will be printed on failure.
+
+            config COMPILER_OPTIMIZATION_ASSERTIONS_SILENT
+                prompt "Silent (saves code size)"
+                bool
+                help
+                    Enable silent assertions. Failed assertions will abort(), user needs to
+                    use the aborting address to find the line number with the failed assertion.
+
+            config COMPILER_OPTIMIZATION_ASSERTIONS_DISABLE
+                prompt "Disabled (sets -DNDEBUG)"
+                bool
+                help
+                    If assertions are disabled, -DNDEBUG is added to CPPFLAGS.
+
+        endchoice # assertions
+
+        menuconfig COMPILER_CXX_EXCEPTIONS
+            bool "Enable C++ exceptions"
+            default n
+            help
+                Enabling this option compiles all IDF C++ files with exception support enabled.
+
+                Disabling this option disables C++ exception support in all compiled files, and any libstdc++ code
+                which throws an exception will abort instead.
+
+                Enabling this option currently adds an additional ~500 bytes of heap overhead
+                when an exception is thrown in user code for the first time.
+
+        choice COMPILER_STACK_CHECK_MODE
+            prompt "Stack smashing protection mode"
+            default COMPILER_STACK_CHECK_MODE_NONE
+            help
+                Stack smashing protection mode. Emit extra code to check for buffer overflows, such as stack
+                smashing attacks. This is done by adding a guard variable to functions with vulnerable objects.
+                The guards are initialized when a function is entered and then checked when the function exits.
+                If a guard check fails, program is halted. Protection has the following modes:
+
+                - In NORMAL mode (GCC flag: -fstack-protector) only functions that call alloca, and functions with
+                  buffers larger than 8 bytes are protected.
+
+                - STRONG mode (GCC flag: -fstack-protector-strong) is like NORMAL, but includes additional functions
+                  to be protected -- those that have local array definitions, or have references to local frame
+                  addresses.
+
+                - In OVERALL mode (GCC flag: -fstack-protector-all) all functions are protected.
+
+                Modes have the following impact on code performance and coverage:
+
+                - performance: NORMAL > STRONG > OVERALL
+
+                - coverage: NORMAL < STRONG < OVERALL
+
+
+            config COMPILER_STACK_CHECK_MODE_NONE
+                bool "None"
+            config COMPILER_STACK_CHECK_MODE_NORM
+                bool "Normal"
+            config COMPILER_STACK_CHECK_MODE_STRONG
+                bool "Strong"
+            config COMPILER_STACK_CHECK_MODE_ALL
+                bool "Overall"
+        endchoice
+
+        config COMPILER_STACK_CHECK
+            bool
+            default !COMPILER_STACK_CHECK_MODE_NONE
+            help
+                Stack smashing protection.
+
+        config COMPILER_WARN_WRITE_STRINGS
+            bool "Enable -Wwrite-strings warning flag"
+            default "n"
+            help
+                Adds -Wwrite-strings flag for the C/C++ compilers.
+
+                For C, this gives string constants the type ``const char[]`` so that
+                copying the address of one into a non-const ``char *`` pointer
+                produces a warning. This warning helps to find at compile time code
+                that tries to write into a string constant.
+
+                For C++, this warns about the deprecated conversion from string
+                literals to ``char *``.
+
+
+    endmenu # Compiler Options
+
+    menu "Component config"
+        source "$COMPONENT_KCONFIGS"
+    endmenu

make/project.mk

@@ -95,11 +95,11 @@ $(error IDF_PATH variable is not set to a valid directory.)
 endif
 
 ifdef IDF_TARGET
-ifneq ($(IDF_TARGET),esp32)
-$(error GNU Make based build system only supports esp32 target, but IDF_TARGET is set to $(IDF_TARGET))
+ifneq ($(IDF_TARGET),esp8266)
+$(error GNU Make based build system only supports esp8266 target, but IDF_TARGET is set to $(IDF_TARGET))
 endif
 else
-export IDF_TARGET := esp32
+export IDF_TARGET := esp8266
 endif
 
 
@@ -377,21 +377,6 @@ COMMON_WARNING_FLAGS = -Wall -Werror=all \
 	-Wextra \
 	-Wno-unused-parameter -Wno-sign-compare
 
-ifdef CONFIG_COMPILER_DISABLE_GCC8_WARNINGS
-COMMON_WARNING_FLAGS += -Wno-parentheses \
-	-Wno-sizeof-pointer-memaccess \
-	-Wno-clobbered \
-	-Wno-format-overflow \
-	-Wno-stringop-truncation \
-	-Wno-misleading-indentation \
-	-Wno-cast-function-type \
-	-Wno-implicit-fallthrough \
-	-Wno-unused-const-variable \
-	-Wno-switch-unreachable \
-	-Wno-format-truncation \
-	-Wno-memset-elt-size \
-	-Wno-int-in-bool-context
-endif
 
 ifdef CONFIG_COMPILER_WARN_WRITE_STRINGS
 COMMON_WARNING_FLAGS += -Wwrite-strings