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699f5d6bbc
The difference from the previous try is that we no longer directly access function declarations from position independent executables. It should work, but currently doesn't with some linkers. It now includes a fix to not mark available_externally definitions as dso_local. Original message: Start setting dso_local in clang. This starts adding dso_local to clang. The hope is to eventually have TargetMachine::shouldAssumeDsoLocal go away. My objective for now is to move enough of it to clang to remove the need for the TargetMachine one to handle PIE copy relocations and -fno-plt. With that it should then be easy to implement a -fno-copy-reloc in clang. This patch just adds the cases where we assume a symbol to be local based on the file being compiled for an executable or a shared library. llvm-svn: 324535
60 lines
2.7 KiB
C
60 lines
2.7 KiB
C
// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -mrelocation-model static %s -o - | FileCheck --check-prefix=STATIC %s
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// STATIC-DAG: @bar = external dso_local global i32
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// STATIC-DAG: @weak_bar = extern_weak dso_local global i32
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// STATIC-DAG: declare dso_local void @foo()
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// STATIC-DAG: @baz = dso_local global i32 42
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// STATIC-DAG: define dso_local i32* @zed()
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// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -pic-is-pie -mpie-copy-relocations %s -o - | FileCheck --check-prefix=PIE-COPY %s
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// PIE-COPY-DAG: @bar = external dso_local global i32
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// PIE-COPY-DAG: @weak_bar = extern_weak global i32
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// PIE-COPY-DAG: declare void @foo()
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// PIE-COPY-DAG: @baz = dso_local global i32 42
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// PIE-COPY-DAG: define dso_local i32* @zed()
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// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -pic-is-pie %s -o - | FileCheck --check-prefix=PIE %s
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// PIE-DAG: @bar = external global i32
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// PIE-DAG: @weak_bar = extern_weak global i32
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// PIE-DAG: declare void @foo()
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// PIE-DAG: @baz = dso_local global i32 42
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// PIE-DAG: define dso_local i32* @zed()
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// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -mrelocation-model static -fno-plt %s -o - | FileCheck --check-prefix=NOPLT %s
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// NOPLT-DAG: @bar = external dso_local global i32
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// NOPLT-DAG: @weak_bar = extern_weak dso_local global i32
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// NOPLT-DAG: declare void @foo()
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// NOPLT-DAG: @baz = dso_local global i32 42
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// NOPLT-DAG: define dso_local i32* @zed()
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// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -fno-plt -pic-is-pie -mpie-copy-relocations %s -o - | FileCheck --check-prefix=PIE-COPY-NOPLT %s
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// PIE-COPY-NOPLT-DAG: @bar = external dso_local global i32
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// PIE-COPY-NOPLT-DAG: @weak_bar = extern_weak global i32
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// PIE-COPY-NOPLT-DAG: declare void @foo()
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// PIE-COPY-NOPLT-DAG: @baz = dso_local global i32 42
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// PIE-COPY-NOPLT-DAG: define dso_local i32* @zed()
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// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -pic-is-pie -fno-plt %s -o - | FileCheck --check-prefix=PIE-NO-PLT %s
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// RUN: %clang_cc1 -triple powerpc64le-pc-linux -emit-llvm -mrelocation-model static %s -o - | FileCheck --check-prefix=PIE-NO-PLT %s
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// PIE-NO-PLT-DAG: @bar = external global i32
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// PIE-NO-PLT-DAG: @weak_bar = extern_weak global i32
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// PIE-NO-PLT-DAG: declare void @foo()
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// PIE-NO-PLT-DAG: @baz = dso_local global i32 42
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// PIE-NO-PLT-DAG: define dso_local i32* @zed()
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// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm %s -o - | FileCheck --check-prefix=SHARED %s
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// SHARED-DAG: @bar = external global i32
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// SHARED-DAG: @weak_bar = extern_weak global i32
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// SHARED-DAG: declare void @foo()
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// SHARED-DAG: @baz = global i32 42
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// SHARED-DAG: define i32* @zed()
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extern int bar;
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__attribute__((weak)) extern int weak_bar;
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void foo(void);
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int baz = 42;
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int *zed() {
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foo();
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return baz ? &weak_bar : &bar;
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}
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