fd739804e0
For a default visibility external linkage definition, dso_local is set for ELF
-fno-pic/-fpie and COFF and Mach-O. Since default clang -cc1 for ELF is similar
to -fpic ("PIC Level" is not set), this nuance causes unneeded binary format differences.
To make emitted IR similar, ELF -cc1 -fpic will default to -fno-semantic-interposition,
which sets dso_local for default visibility external linkage definitions.
To make this flip smooth and enable future (dso_local as definition default),
this patch replaces (function) `define ` with `define{{.*}} `,
(variable/constant/alias) `= ` with `={{.*}} `, or inserts appropriate `{{.*}} `.
36 lines
1.1 KiB
C
36 lines
1.1 KiB
C
// RUN: %clang_cc1 -x c -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
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// RUN: %clang_cc1 -x c -fsanitize=pointer-overflow -fno-sanitize-recover=pointer-overflow -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
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// RUN: %clang_cc1 -x c++ -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
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// RUN: %clang_cc1 -x c++ -fsanitize=pointer-overflow -fno-sanitize-recover=pointer-overflow -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct S {
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int x, y;
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};
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// CHECK-LABEL: define{{.*}} i64 @{{.*}}get_offset_of_y_naively{{.*}}(
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uintptr_t get_offset_of_y_naively() {
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// CHECK: [[ENTRY:.*]]:
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// CHECK-NEXT: ret i64 ptrtoint (i32* getelementptr (i32, i32* null, i32 1) to i64)
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// CHECK-NEXT: }
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return ((uintptr_t)(&(((struct S *)0)->y)));
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}
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// CHECK-LABEL: define{{.*}} i64 @{{.*}}get_offset_of_y_via_builtin{{.*}}(
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uintptr_t get_offset_of_y_via_builtin() {
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// CHECK: [[ENTRY:.*]]:
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// CHECK-NEXT: ret i64 4
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// CHECK-NEXT: }
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return __builtin_offsetof(struct S, y);
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}
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#ifdef __cplusplus
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}
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#endif
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