6b3351792c
For a definition (of most linkage types), dso_local is set for ELF -fno-pic/-fpie
and COFF, but not for Mach-O. This nuance causes unneeded binary format differences.
This patch replaces (function) `define ` with `define{{.*}} `,
(variable/constant/alias) `= ` with `={{.*}} `, or inserts appropriate `{{.*}} `
if there is an explicit linkage.
* Clang will set dso_local for Mach-O, which is currently implied by TargetMachine.cpp. This will make COFF/Mach-O and executable ELF similar.
* Eventually I hope we can make dso_local the textual LLVM IR default (write explicit "dso_preemptable" when applicable) and -fpic ELF will be similar to everything else. This patch helps move toward that goal.
20 lines
644 B
C++
20 lines
644 B
C++
// RUN: %clang_cc1 -triple x86_64-apple-darwin -emit-llvm -o - %s -std=c++2a | FileCheck %s
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// RUN: %clang_cc1 -triple x86_64-apple-darwin -emit-pch -o %t.pch %s -std=c++2a
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// RUN: %clang_cc1 -triple x86_64-apple-darwin -include-pch %t.pch -x c++ /dev/null -emit-llvm -o - -std=c++2a | FileCheck %s
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struct B {
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constexpr B() {}
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constexpr ~B() { n *= 5; }
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int n = 123;
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};
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// We emit a dynamic destructor here because b.n might have been modified
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// before b is destroyed.
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//
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// CHECK: @b ={{.*}} global {{.*}} i32 123
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B b = B();
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// CHECK: define {{.*}}cxx_global_var_init
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// CHECK: call {{.*}} @__cxa_atexit({{.*}} @_ZN1BD1Ev {{.*}} @b
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