From 8a1d6a5eec8287729084e2a79b39fac96a9c75cd Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Tue, 11 Oct 2011 22:09:24 +0000
Subject: [PATCH] PR11062: Make C99 inlining work properly for names with
 associated builtin libcalls.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141723 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/AST/Decl.cpp      | 7 ++++++-
 test/CodeGen/inline.c | 7 ++++++-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/AST/Decl.cpp b/lib/AST/Decl.cpp
index 5cd98584bf..3e5c253737 100644
--- a/lib/AST/Decl.cpp
+++ b/lib/AST/Decl.cpp
@@ -1856,7 +1856,12 @@ bool FunctionDecl::isInlineDefinitionExternallyVisible() const {
     // Only consider file-scope declarations in this test.
     if (!Redecl->getLexicalDeclContext()->isTranslationUnit())
       continue;
-    
+
+    // Only consider explicit declarations; the presence of a builtin for a
+    // libcall shouldn't affect whether a definition is externally visible.
+    if (Redecl->isImplicit())
+      continue;
+
     if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern) 
       return true; // Not an inline definition
   }
diff --git a/test/CodeGen/inline.c b/test/CodeGen/inline.c
index 2f6bd72dab..6bc583df8c 100644
--- a/test/CodeGen/inline.c
+++ b/test/CodeGen/inline.c
@@ -15,7 +15,7 @@
 // RUN: grep "define i32 @test6" %t
 
 // RUN: echo "\nC99 tests:"
-// RUN: %clang %s -O1 -emit-llvm -S -o %t -std=c99
+// RUN: %clang %s -O1 -emit-llvm -S -o %t -std=gnu99
 // RUN: grep "define i32 @ei()" %t
 // RUN: grep "define available_externally i32 @foo()" %t
 // RUN: grep "define i32 @bar()" %t
@@ -29,6 +29,7 @@
 // RUN: grep "define available_externally i32 @test4" %t
 // RUN: grep "define available_externally i32 @test5" %t
 // RUN: grep "define i32 @test6" %t
+// RUN: grep "define available_externally i.. @strlcpy" %t
 
 // RUN: echo "\nC++ tests:"
 // RUN: %clang -x c++ %s -O1 -emit-llvm -S -o %t -std=c++98
@@ -97,3 +98,7 @@ extern int test6();
 // redeclaration detection.
 void test7() { }
 void test7();
+
+// PR11062; the fact that the function is named strlcpy matters here.
+inline __typeof(sizeof(int)) strlcpy(char *dest, const char *src, __typeof(sizeof(int)) size) { return 3; }
+void test8() { strlcpy(0,0,0); }
-- 
2.40.0