Merging r371766:
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r371766 | nickdesaulniers | 2019-09-12 21:53:35 +0200 (Thu, 12 Sep 2019) | 29 lines
[Clang][CodeGen] support alias attribute w/ gnu_inline
Summary:
r369705 did not consider the addition of gnu_inline on function
declarations of alias attributed functions. This resulted in a reported
regression in the clang-9-rc4 release from the Zig developers building
glibc, which was observable as a failed assertion:
llvm-project/clang/lib/AST/Decl.cpp:3336: bool
clang::FunctionDecl::isInlineDefinitionExternallyVisible() const:
Assertion `(doesThisDeclarationHaveABody() || willHaveBody()) && "Must
be a function definition"' failed.
Alias function declarations do not have bodies, so allow us to proceed
if we have the alias function attribute but no body/definition, and add
a test case. The emitted symbols and their linkage matches GCC for the
added test case.
Link: https://bugs.llvm.org/show_bug.cgi?id=43268
Reviewers: aaron.ballman, rsmith, erichkeane, andrewrk
Reviewed By: andrewrk
Subscribers: cfe-commits, andrewrk, hans, srhines
Tags: #clang
Differential Revision: https://reviews.llvm.org/D67455
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llvm-svn: 371821
diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
index 21cf9da..aa74da0 100644
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -3332,7 +3332,8 @@
/// an externally visible symbol, but "extern inline" will not create an
/// externally visible symbol.
bool FunctionDecl::isInlineDefinitionExternallyVisible() const {
- assert((doesThisDeclarationHaveABody() || willHaveBody()) &&
+ assert((doesThisDeclarationHaveABody() || willHaveBody() ||
+ hasAttr<AliasAttr>()) &&
"Must be a function definition");
assert(isInlined() && "Function must be inline");
ASTContext &Context = getASTContext();
diff --git a/clang/test/CodeGen/alias.c b/clang/test/CodeGen/alias.c
index 46568ee..f5bdf3c 100644
--- a/clang/test/CodeGen/alias.c
+++ b/clang/test/CodeGen/alias.c
@@ -99,3 +99,8 @@
// CHECKGLOBALS-NOT: @test11_foo = dso_local
void test11(void) {}
static void test11_foo(void) __attribute__((alias("test11")));
+
+// Test that gnu_inline+alias work.
+// CHECKGLOBALS: @test12_alias = alias void (), void ()* @test12
+void test12(void) {}
+inline void test12_alias(void) __attribute__((gnu_inline, alias("test12")));
