Add a C2x spelling for the external_source_symbol and internal_linkag…

…e attributes in the clang vendor namespace.

Both of these attributes have existing meaning in C code, so there was no reason to exclude them from using the new spelling.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@326053 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/Attr.td

@@ -723,7 +723,7 @@ static llvm::StringRef canonicalizePlatformName(llvm::StringRef Platform) {
 }
 
 def ExternalSourceSymbol : InheritableAttr {
-  let Spellings = [Clang<"external_source_symbol">];
+  let Spellings = [Clang<"external_source_symbol", 1>];
   let Args = [StringArgument<"language", 1>,
               StringArgument<"definedIn", 1>,
               BoolArgument<"generatedDeclaration", 1>];
@@ -2817,7 +2817,7 @@ def OMPDeclareTargetDecl : Attr {
 }
 
 def InternalLinkage : InheritableAttr {
-  let Spellings = [Clang<"internal_linkage">];
+  let Spellings = [Clang<"internal_linkage", 1>];
   let Subjects = SubjectList<[Var, Function, CXXRecord]>;
   let Documentation = [InternalLinkageDocs];
 }

test/Sema/attr-external-source-symbol.c

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -fblocks -verify %s
+// RUN: %clang_cc1 -fsyntax-only -fblocks -verify -fdouble-square-bracket-attributes %s
 
 void threeClauses() __attribute__((external_source_symbol(language="Swift", defined_in="module", generated_declaration)));
 
@@ -17,3 +17,15 @@ void namedDeclsOnly() {
       return 1;
   };
 }
+
+void threeClauses2() [[clang::external_source_symbol(language="Swift", defined_in="module", generated_declaration)]];
+
+void twoClauses2() [[clang::external_source_symbol(language="Swift", defined_in="module")]];
+
+void fourClauses2()
+[[clang::external_source_symbol(language="Swift", defined_in="module", generated_declaration, generated_declaration)]]; // expected-error {{duplicate 'generated_declaration' clause in an 'external_source_symbol' attribute}}
+
+void oneClause2() [[clang::external_source_symbol(generated_declaration)]];
+
+void noArguments2()
+[[clang::external_source_symbol]]; // expected-error {{'external_source_symbol' attribute takes at least 1 argument}}

test/Sema/internal_linkage.c

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -verify %s
+// RUN: %clang_cc1 -fsyntax-only -verify -fdouble-square-bracket-attributes %s
 
 int var __attribute__((internal_linkage));
 int var2 __attribute__((internal_linkage,common)); // expected-error{{'internal_linkage' and 'common' attributes are not compatible}} \
@@ -19,3 +19,9 @@ struct __attribute__((internal_linkage)) S { // expected-warning{{'internal_link
 };
 
 __attribute__((internal_linkage("foo"))) int g() {} // expected-error{{'internal_linkage' attribute takes no arguments}}
+
+int var6 [[clang::internal_linkage]];
+int var7 [[clang::internal_linkage]] __attribute__((common)); // expected-error{{'internal_linkage' and 'common' attributes are not compatible}} \
+                                                   // expected-note{{conflicting attribute is here}}
+__attribute__((common)) int var8 [[clang::internal_linkage]]; // expected-error{{'internal_linkage' and 'common' attributes are not compatible}} \
+                                                   // expected-note{{conflicting attribute is here}}