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Per the ELF spec, section groups may only contain local symbols if those symbols are only referenced from within the section group. [1] In the case of template parameter objects, they can be referenced from outside the group when the type of the object was declared in an anonymous namespace. In that case, we can't place the object in a COMDAT. This matches GCC's linkage behavior on the test input. [1]: https://www.sco.com/developers/gabi/latest/ch4.sheader.html#section_groups
32 lines
1.6 KiB
C++
32 lines
1.6 KiB
C++
// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++20 %s -emit-llvm -o - | FileCheck %s --check-prefixes=ITANIUM,CHECK
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// RUN: %clang_cc1 -triple x86_64-windows -std=c++20 %s -emit-llvm -o - | FileCheck %s --check-prefixes=MSABI,CHECK
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struct S { char buf[32]; };
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template<S s> constexpr const char *begin() { return s.buf; }
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template<S s> constexpr const char *end() { return s.buf + __builtin_strlen(s.buf); }
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namespace { struct T { char buf[32]; }; }
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template<T t> constexpr const char* begin_anon() { return t.buf; }
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// ITANIUM: [[HELLO:@_ZTAXtl1StlA32_cLc104ELc101ELc108ELc108ELc111ELc32ELc119ELc111ELc114ELc108ELc100EEEE]]
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// MSABI: [[HELLO:@"[?][?]__N2US@@3D0GI@@0GF@@0GM@@0GM@@0GP@@0CA@@0HH@@0GP@@0HC@@0GM@@0GE@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@0A@@@@@"]]
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// ITANIUM-SAME: = linkonce_odr constant { <{ [11 x i8], [21 x i8] }> } { <{ [11 x i8], [21 x i8] }> <{ [11 x i8] c"hello world", [21 x i8] zeroinitializer }> }, comdat
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// MSABI-SAME: = linkonce_odr dso_local constant { <{ [11 x i8], [21 x i8] }> } { <{ [11 x i8], [21 x i8] }> <{ [11 x i8] c"hello world", [21 x i8] zeroinitializer }> }, comdat
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// ITANIUM: @p
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// MSABI: @"?p@@3PEBDEB"
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// CHECK-SAME: global ptr [[HELLO]]
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const char *p = begin<S{"hello world"}>();
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// ITANIUM: @q
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// MSABI: @"?q@@3PEBDEB"
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// CHECK-SAME: global ptr getelementptr (i8, ptr [[HELLO]], i64 11)
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const char *q = end<S{"hello world"}>();
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// CHECK: internal constant { <{ [10 x i8], [22 x i8] }> } { <{ [10 x i8], [22 x i8] }> <{ [10 x i8] c"hello anon", [22 x i8] zeroinitializer }> }
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// CHECK-NOT: comdat
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// ITANIUM: @r
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// MSABI: @"?r@@3PEBDEB"
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const char *r = begin_anon<T{"hello anon"}>();
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