0d4fb98504
The llvm IR until recently had no support for comdats. This was a problem when targeting C++ on ELF/COFF as just using weak linkage would cause quite a bit of dead bits to remain on the executable (unless -ffunction-sections, -fdata-sections and --gc-sections were used). To fix the problem, llvm's codegen will just assume that any weak or linkonce that is not in an explicit comdat should be output in one with the same name as the global. This unfortunately breaks cases like pr19848 where a weak symbol is not xpected to be part of any comdat. Now that we have explicit comdats in the IR, we can finally get both cases right. This first patch just makes clang give explicit comdats to GlobalValues where t is allowed to. A followup patch to llvm will then stop implicitly producing comdats. llvm-svn: 225705
34 lines
985 B
C
34 lines
985 B
C
// RUN: %clang_cc1 -triple i386-pc-win32 %s -emit-llvm -fms-compatibility -o - | FileCheck %s
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__declspec(selectany) int x1 = 1;
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const __declspec(selectany) int x2 = 2;
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// CHECK: @x1 = weak_odr global i32 1, comdat, align 4
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// CHECK: @x2 = weak_odr constant i32 2, comdat, align 4
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struct __declspec(align(16)) S {
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char x;
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};
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union { struct S s; } u;
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// CHECK: @u = {{.*}}zeroinitializer, align 16
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// CHECK: define void @t3() [[NAKED:#[0-9]+]] {
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__declspec(naked) void t3() {}
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// CHECK: define void @t22() [[NUW:#[0-9]+]]
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void __declspec(nothrow) t22();
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void t22() {}
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// CHECK: define void @t2() [[NI:#[0-9]+]] {
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__declspec(noinline) void t2() {}
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// CHECK: call void @f20_t() [[NR:#[0-9]+]]
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__declspec(noreturn) void f20_t(void);
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void f20(void) { f20_t(); }
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// CHECK: attributes [[NAKED]] = { naked noinline nounwind{{.*}} }
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// CHECK: attributes [[NUW]] = { nounwind{{.*}} }
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// CHECK: attributes [[NI]] = { noinline nounwind{{.*}} }
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// CHECK: attributes [[NR]] = { noreturn }
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