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This patch adds a flag -fclang-abi-compat that can be used to request that Clang attempts to be ABI-compatible with some older version of itself. This is provided on a best-effort basis; right now, this can be used to undo the ABI change in r310401, reverting Clang to its prior C++ ABI for pass/return by value of class types affected by that change, and to undo the ABI change in r262688, reverting Clang to using integer registers rather than SSE registers for passing <1 x long long> vectors. The intent is that we will maintain this backwards compatibility path as we make ABI-breaking fixes in future. The reversion to the old behavior for r310401 is also applied to the PS4 target since that change is not part of its platform ABI (which is essentially to do whatever Clang 3.2 did). llvm-svn: 311823
20 lines
1.1 KiB
C++
20 lines
1.1 KiB
C++
// RUN: %clang_cc1 -std=c++17 -triple x86_64-linux-gnu -fclang-abi-compat=3.0 %s -emit-llvm -o - | FileCheck --check-prefix=PRE39 --check-prefix=PRE5 %s
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// RUN: %clang_cc1 -std=c++17 -triple x86_64-linux-gnu -fclang-abi-compat=3.8 %s -emit-llvm -o - | FileCheck --check-prefix=PRE39 --check-prefix=PRE5 %s
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// RUN: %clang_cc1 -std=c++17 -triple x86_64-linux-gnu -fclang-abi-compat=3.9 %s -emit-llvm -o - | FileCheck --check-prefix=V39 --check-prefix=PRE5 %s
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// RUN: %clang_cc1 -std=c++17 -triple x86_64-linux-gnu -fclang-abi-compat=4.0 %s -emit-llvm -o - | FileCheck --check-prefix=V39 --check-prefix=PRE5 %s
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// RUN: %clang_cc1 -std=c++17 -triple x86_64-linux-gnu -fclang-abi-compat=5 %s -emit-llvm -o - | FileCheck --check-prefix=V39 --check-prefix=V5 %s
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// RUN: %clang_cc1 -std=c++17 -triple x86_64-linux-gnu -fclang-abi-compat=latest %s -emit-llvm -o - | FileCheck --check-prefix=V39 --check-prefix=V5 %s
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typedef __attribute__((vector_size(8))) long long v1xi64;
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void clang39(v1xi64) {}
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// PRE39: @_Z7clang39Dv1_x(i64
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// V39: @_Z7clang39Dv1_x(double
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struct A {
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A(const A&) = default;
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A(A&&);
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};
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void clang5(A) {}
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// PRE5: @_Z6clang51A()
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// V5: @_Z6clang51A(%{{.*}}*
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