Disallow aliases to available_externally.
They are as much trouble as aliases to declarations. They are requiring
the code generator to define a symbol with the same value as another
symbol, but the second symbol is undefined.
If representing this is important for some optimization, we could add
support for available_externally aliases. They would be *required* to
point to a declaration (or available_externally definition).
llvm-svn: 254170
diff --git a/llvm/test/Linker/funcimport.ll b/llvm/test/Linker/funcimport.ll
index d6aa050..8a71e21 100644
--- a/llvm/test/Linker/funcimport.ll
+++ b/llvm/test/Linker/funcimport.ll
@@ -36,7 +36,7 @@
; turned into a declaration, but that strong alias to an imported function
; is imported as alias.
; RUN: llvm-link %t2.bc -functionindex=%t3.thinlto.bc -import=globalfunc2:%t.bc -S | FileCheck %s --check-prefix=IMPORTGLOB2
-; IMPORTGLOB2-DAG: @analias = alias void (...), bitcast (void ()* @globalfunc2
+; IMPORTGLOB2-DAG: declare void @analias()
; IMPORTGLOB2-DAG: declare void @globalfunc1
; IMPORTGLOB2-DAG: define available_externally void @globalfunc2
; IMPORTGLOB2-DAG: declare extern_weak void @weakalias
@@ -44,7 +44,7 @@
; Ensure that strong alias imported in second pass of importing ends up
; as an alias.
; RUN: llvm-link %t2.bc -functionindex=%t3.thinlto.bc -import=globalfunc1:%t.bc -import=globalfunc2:%t.bc -S | FileCheck %s --check-prefix=IMPORTGLOB3
-; IMPORTGLOB3-DAG: @analias = alias void (...), bitcast (void ()* @globalfunc2
+; IMPORTGLOB3-DAG: declare void @analias()
; IMPORTGLOB3-DAG: define available_externally void @globalfunc1
; IMPORTGLOB3-DAG: define available_externally void @globalfunc2
; IMPORTGLOB3-DAG: declare extern_weak void @weakalias
@@ -53,11 +53,17 @@
; as an alias, and that seeing the alias definition during a second inlining
; pass is handled correctly.
; RUN: llvm-link %t2.bc -functionindex=%t3.thinlto.bc -import=globalfunc2:%t.bc -import=globalfunc1:%t.bc -S | FileCheck %s --check-prefix=IMPORTGLOB4
-; IMPORTGLOB4-DAG: @analias = alias void (...), bitcast (void ()* @globalfunc2
+; IMPORTGLOB4-DAG: declare void @analias()
; IMPORTGLOB4-DAG: define available_externally void @globalfunc2
; IMPORTGLOB4-DAG: define available_externally void @globalfunc1
; IMPORTGLOB4-DAG: declare extern_weak void @weakalias
+; An alias to an imported function is imported as alias if the function is not
+; available_externally.
+; RUN: llvm-link %t2.bc -functionindex=%t3.thinlto.bc -import=linkoncefunc:%t.bc -S | FileCheck %s --check-prefix=IMPORTGLOB5
+; IMPORTGLOB5-DAG: linkoncealias = alias void (...), bitcast (void ()* @linkoncefunc to void (...)*)
+; IMPORTGLOB5-DAG: define linkonce_odr void @linkoncefunc()
+
; Ensure that imported static variable and function references are correctly
; promoted and renamed (including static constant variable).
; RUN: llvm-link %t2.bc -functionindex=%t3.thinlto.bc -import=referencestatics:%t.bc -S | FileCheck %s --check-prefix=IMPORTSTATIC