d1fd72343c
The idea is that the CC1 default for ELF should set dso_local on default
visibility external linkage definitions in the default -mrelocation-model pic
mode (-fpic/-fPIC) to match COFF/Mach-O and make output IR similar.
The refactoring is made available by 2820a2ca3a.
Currently only x86 supports local aliases. We move the decision to the driver.
There are three CC1 states:
* -fsemantic-interposition: make some linkages interposable and make default visibility external linkage definitions dso_preemptable.
* (default): selected if the target supports .Lfoo$local: make default visibility external linkage definitions dso_local
* -fhalf-no-semantic-interposition: if neither option is set or the target does not support .Lfoo$local: like -fno-semantic-interposition but local aliases are not used. So references can be interposed if not optimized out.
Add -fhalf-no-semantic-interposition to a few tests using the half-based semantic interposition behavior.
17 lines
786 B
C++
17 lines
786 B
C++
// Check that no alias is emitted when the vtable is already dso_local. This can
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// happen if the class is hidden.
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// RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables -fhalf-no-semantic-interposition | FileCheck %s --check-prefix=DEFAULT-VIS
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// RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables -fvisibility hidden | FileCheck %s --check-prefix=HIDDEN-VIS
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// DEFAULT-VIS: @_ZTV1A.local = private unnamed_addr constant
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// DEFAULT-VIS: @_ZTV1A ={{.*}} unnamed_addr alias { [3 x i32] }, { [3 x i32] }* @_ZTV1A.local
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// HIDDEN-VIS-NOT: @_ZTV1A.local
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// HIDDEN-VIS: @_ZTV1A = hidden unnamed_addr constant
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class A {
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public:
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virtual void func();
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};
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void A::func() {}
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