C: add _Thread_local C11 keyword

Signed-off-by: Masatake YAMATO <yamato@redhat.com>

Units/parser-c.r/properties-thread.d/expected.tags

@@ -1,3 +1,4 @@
 i	input.c	/^__thread int i;$/;"	v	typeref:typename:int	properties:thread_local
 s	input.c	/^extern __thread struct state s;$/;"	x	typeref:struct:state	properties:extern,thread_local
 p	input.c	/^static __thread char *p;$/;"	v	typeref:typename:char *	file:	properties:static,thread_local
+q	input.c	/^static _Thread_local char *q;$/;"	v	typeref:typename:char *	file:	properties:static,thread_local

Units/parser-c.r/properties-thread.d/input.c

@@ -2,3 +2,5 @@
 __thread int i;
 extern __thread struct state s;
 static __thread char *p;
+
+static _Thread_local char *q;

parsers/cxx/cxx_keyword.c

@@ -141,6 +141,11 @@ static CXXKeywordDescriptor g_aCXXKeywordTable[] = {
 		CXXLanguageC | CXXLanguageCPP,
 		CXXKeywordMayAppearInVariableDeclaration | CXXKeywordExcludeFromTypeNames,
 	},
+	{
+		"_Thread_local",
+		CXXLanguageC,
+		CXXKeywordMayAppearInVariableDeclaration | CXXKeywordExcludeFromTypeNames,
+	},
 	{
 		"alignas",
 		CXXLanguageCPP,

parsers/cxx/cxx_keyword.h

@@ -34,6 +34,7 @@ typedef enum _CXXKeyword
 	CXXKeyword__STDCALL, // Microsoft C/C++
 	CXXKeyword__THISCALL, // Microsoft C/C++
 	CXXKeyword__THREAD, // GCC (https://gcc.gnu.org/onlinedocs/gcc-3.3.1/gcc/Thread-Local.html#Thread-Local)
+	CXXKeyword_THREAD_LOCAL, // C11
 	CXXKeywordALIGNAS, // (since C++11)
 	CXXKeywordALIGNOF, // (since C++11)
 	//CXXKeywordAND,

parsers/cxx/cxx_parser_block.c

@@ -648,6 +648,7 @@ static bool cxxParserParseBlockInternal(bool bExpectClosingBracket)
 					break;
 					case CXXKeywordTHREAD_LOCAL:
 					case CXXKeyword__THREAD:
+					case CXXKeyword_THREAD_LOCAL:
 						g_cxx.uKeywordState |= CXXParserKeywordStateSeenThreadLocal;
 					break;