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 2820a2ca3a0e69c3f301845420e0067ffff2251b. 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.
29 lines
1.8 KiB
C
29 lines
1.8 KiB
C
// RUN: %clang -target x86_64 %s -Werror -fpic -fsemantic-interposition -c -### 2>&1 | FileCheck %s
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// RUN: %clang -target x86_64 %s -Werror -fPIC -fsemantic-interposition -c -### 2>&1 | FileCheck %s
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// CHECK: "-fsemantic-interposition"
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/// No-op for -fno-pic/-fpie.
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// RUN: %clang -target x86_64 %s -Werror -fsemantic-interposition -c -### 2>&1 | FileCheck --check-prefix=NOOP %s
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// RUN: %clang -target x86_64 %s -Werror -fPIE -fsemantic-interposition -c -### 2>&1 | FileCheck --check-prefix=NOOP %s
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// NOOP-NOT: "-fsemantic-interposition"
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// NOOP-NOT: "-fno-semantic-interposition"
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/// If -fno-semantic-interposition is specified and the target supports local
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/// aliases, neither CC1 option is set.
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// RUN: %clang -target i386 %s -Werror -fPIC -fno-semantic-interposition -c -### 2>&1 | FileCheck --check-prefix=NO %s
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// RUN: %clang -target x86_64 %s -Werror -fPIC -fno-semantic-interposition -c -### 2>&1 | FileCheck --check-prefix=NO %s
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// NO-NOT: "-fsemantic-interposition"
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// NO-NOT: "-fhalf-no-semantic-interposition"
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/// If neither -fsemantic-interposition or -fno-semantic-interposition is specified,
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/// or -fno-semantic-interposition is specified but the target does not support
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/// local aliases, use the traditional half-baked behavor: interprocedural
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/// optimizations are allowed but local aliases are not used. If references are
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/// not optimized out, semantic interposition at runtime is possible.
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// RUN: %clang -target aarch64 %s -Werror -fPIC -fno-semantic-interposition -c -### 2>&1 | FileCheck --check-prefix=HALF %s
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// RUN: %clang -target ppc64le %s -Werror -fPIC -fno-semantic-interposition -c -### 2>&1 | FileCheck --check-prefix=HALF %s
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// RUN: %clang -target x86_64 %s -Werror -fPIC -c -### 2>&1 | FileCheck --check-prefix=HALF %s
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//
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// HALF: "-fhalf-no-semantic-interposition"
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