CI: check_public_headers script will detect the use of static asserts in headers

When a public header contains _Static_assert or static_assert, check_public_headers.py script will detect it and report it as an issue.
Indeed, public headers shall now use ESP_STATIC_ASSERT.

tools/ci/check_public_headers.py

@@ -46,6 +46,11 @@ class HeaderFailedContainsCode(HeaderFailed):
         return 'Header Produced non-zero object'
 
 
+class HeaderFailedContainsStaticAssert(HeaderFailed):
+    def __str__(self) -> str:
+        return 'Header uses _Static_assert or static_assert instead of ESP_STATIC_ASSERT'
+
+
 #   Creates a temp file and returns both output as a string and a file name
 #
 def exec_cmd_to_temp_file(what: List, suffix: str='') -> Tuple[int, str, str, str, str]:
@@ -74,6 +79,7 @@ class PublicHeaderChecker:
     PREPROC_OUT_SAME_HRD_FAILED = 5        # -> Both preprocessors produce the same, non-zero output (header file FAILs)
     PREPROC_OUT_DIFFERENT_WITH_EXT_C_HDR_OK = 6    # -> Both preprocessors produce different, non-zero output with extern "C" (header seems OK)
     PREPROC_OUT_DIFFERENT_NO_EXT_C_HDR_FAILED = 7  # -> Both preprocessors produce different, non-zero output without extern "C" (header fails)
+    HEADER_CONTAINS_STATIC_ASSERT = 8      # -> Header file contains _Static_assert instead of static_assert or ESP_STATIC_ASSERT
 
     def log(self, message: str, debug: bool=False) -> None:
         if self.verbose or debug:
@@ -89,6 +95,9 @@ class PublicHeaderChecker:
         self.error_macro = re.compile(r'#error')
         self.error_orphan_kconfig = re.compile(r'#error CONFIG_VARS_USED_WHILE_SDKCONFIG_NOT_INCLUDED')
         self.kconfig_macro = re.compile(r'\bCONFIG_[A-Z0-9_]+')
+        self.static_assert = re.compile(r'(_Static_assert|static_assert)')
+        self.defines_assert = re.compile(r'#define[ \t]+ESP_STATIC_ASSERT')
+        self.auto_soc_header = re.compile(r'components/soc/esp[a-z0-9_]+/include(?:/rev[0-9]+)?/soc/[a-zA-Z0-9_]+.h')
         self.assembly_nocode = r'^\s*(\.file|\.text|\.ident|\.option|\.attribute).*$'
         self.check_threads: List[Thread] = []
 
@@ -160,6 +169,8 @@ class PublicHeaderChecker:
             return self.compile_one_header(header)
         elif res == self.PREPROC_OUT_SAME_HRD_FAILED:
             raise HeaderFailedCppGuardMissing()
+        elif res == self.HEADER_CONTAINS_STATIC_ASSERT:
+            raise HeaderFailedContainsStaticAssert()
         else:
             self.compile_one_header(header)
             temp_header = None
@@ -187,12 +198,20 @@ class PublicHeaderChecker:
 
     def preprocess_one_header(self, header: str, num: int, ignore_sdkconfig_issue: bool=False) -> int:
         all_compilation_flags = ['-w', '-P', '-E', '-DESP_PLATFORM', '-include', header, self.main_c] + self.include_dir_flags
+        # just strip comments to check for CONFIG_... macros or static asserts
+        rc, out, err, _ = exec_cmd([self.gcc, '-fpreprocessed', '-dD',  '-P',  '-E', header] + self.include_dir_flags)
         if not ignore_sdkconfig_issue:
-            # just strip commnets to check for CONFIG_... macros
-            rc, out, err, _ = exec_cmd([self.gcc, '-fpreprocessed', '-dD',  '-P',  '-E', header] + self.include_dir_flags)
             if re.search(self.kconfig_macro, out):
                 # enable defined #error if sdkconfig.h not included
                 all_compilation_flags.append('-DIDF_CHECK_SDKCONFIG_INCLUDED')
+        # If the file contain _Static_assert or static_assert, make sure it does't not define ESP_STATIC_ASSERT and that it
+        # is not an automatically generated soc header file
+        grp = re.search(self.static_assert, out)
+        # Normalize the potential A//B, A/./B, A/../A, from the name
+        normalized_path = os.path.normpath(header)
+        if grp and not re.search(self.defines_assert, out) and not re.search(self.auto_soc_header, normalized_path):
+            self.log('{}: FAILED: contains {}. Please use ESP_STATIC_ASSERT'.format(header, grp.group(1)), True)
+            return self.HEADER_CONTAINS_STATIC_ASSERT
         try:
             # compile with C++, check for errors, outputs for a temp file
             rc, cpp_out, err, cpp_out_file, cmd = exec_cmd_to_temp_file([self.gpp, '--std=c++17'] + all_compilation_flags)
@@ -317,6 +336,8 @@ def check_all_headers() -> None:
         * Check if the "#ifdef __cplusplus" header sentinels are present
     4) "Header Produced non-zero object": Header contains some object, a definition
         * Check if no definition is present in the offending header file
+    5) "Header contains _Static_assert or static_assert": Makes the use of _Static_assert or static_assert
+        functions instead of using ESP_STATIC_ASSERT macro
 
     Notes:
     * The script validates *all* header files (recursively) in public folders for all components.