From d8199c9eaa2e16c7b64b6c18fe88d4339321496e Mon Sep 17 00:00:00 2001
From: Tom Stellard <tstellar@redhat.com>
Date: Tue, 14 Nov 2017 02:38:20 +0000
Subject: Merging r313278:

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r313278 | prazek | 2017-09-14 10:33:08 -0700 (Thu, 14 Sep 2017) | 11 lines

Enable __declspec(selectany) on any platform

Summary:
This feature was disabled probably by mistake in rL300562
This fixes bug https://bugs.llvm.org/show_bug.cgi?id=33285

Reviewers: davide, rnk

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D33852
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_50@318133 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/clang/Basic/Attr.td     |  4 ++--
 include/clang/Basic/AttrDocs.td | 15 +++++++++++++++
 test/Sema/attr-selectany.c      |  2 ++
 test/SemaCXX/attr-selectany.cpp |  3 +++
 4 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/include/clang/Basic/Attr.td b/include/clang/Basic/Attr.td
index f13e13b010..5c69635b94 100644
--- a/include/clang/Basic/Attr.td
+++ b/include/clang/Basic/Attr.td
@@ -2459,9 +2459,9 @@ def DLLImport : InheritableAttr, TargetSpecificAttr<TargetWindows> {
   let Documentation = [DLLImportDocs];
 }
 
-def SelectAny : InheritableAttr, TargetSpecificAttr<TargetWindows> {
+def SelectAny : InheritableAttr {
   let Spellings = [Declspec<"selectany">, GCC<"selectany">];
-  let Documentation = [Undocumented];
+  let Documentation = [SelectAnyDocs];
 }
 
 def Thread : Attr {
diff --git a/include/clang/Basic/AttrDocs.td b/include/clang/Basic/AttrDocs.td
index 33ef3ea4ca..567c7a3a53 100644
--- a/include/clang/Basic/AttrDocs.td
+++ b/include/clang/Basic/AttrDocs.td
@@ -3106,3 +3106,18 @@ This attribute can be added to an Objective-C ``@interface`` declaration to
 ensure that this class cannot be subclassed.
   }];
 }
+
+
+def SelectAnyDocs : Documentation {
+  let Category = DocCatType;
+  let Content = [{
+This attribute appertains to a global symbol, causing it to have a weak
+definition (
+`linkonce <https://llvm.org/docs/LangRef.html#linkage-types>`_
+), allowing the linker to select any definition.
+
+For more information see
+`gcc documentation <https://gcc.gnu.org/onlinedocs/gcc-7.2.0/gcc/Microsoft-Windows-Variable-Attributes.html>`_
+or `msvc documentation <https://docs.microsoft.com/pl-pl/cpp/cpp/selectany>`_.
+}];
+}
diff --git a/test/Sema/attr-selectany.c b/test/Sema/attr-selectany.c
index 9fa2fcade5..9d574d524f 100644
--- a/test/Sema/attr-selectany.c
+++ b/test/Sema/attr-selectany.c
@@ -1,5 +1,7 @@
 // RUN: %clang_cc1 -triple x86_64-win32 -fdeclspec -verify %s
 // RUN: %clang_cc1 -triple x86_64-mingw32 -verify %s
+// RUN: %clang_cc1 -triple x86_64-unknown-linux -verify -fdeclspec %s
+// RUN: %clang_cc1 -triple x86_64-win32-macho -verify -fdeclspec %s
 
 extern __declspec(selectany) const int x1 = 1; // no warning, const means we need extern in C++
 
diff --git a/test/SemaCXX/attr-selectany.cpp b/test/SemaCXX/attr-selectany.cpp
index 62fca09ab3..4afcb8130a 100644
--- a/test/SemaCXX/attr-selectany.cpp
+++ b/test/SemaCXX/attr-selectany.cpp
@@ -1,4 +1,7 @@
 // RUN: %clang_cc1 -triple x86_64-win32 -fms-compatibility -fms-extensions -fsyntax-only -verify -std=c++11 %s
+// RUN: %clang_cc1 -triple x86_64-unknown-linux -fms-compatibility -fms-extensions -fsyntax-only -verify -std=c++11 %s
+// RUN: %clang_cc1 -triple x86_64-win32-macho -fms-compatibility -fms-extensions -fsyntax-only -verify -std=c++11 %s
+
 // MSVC produces similar diagnostics.
 
 __declspec(selectany) void foo() { } // expected-error{{'selectany' can only be applied to data items with external linkage}}
-- 
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