Make the default triple optional by allowing an empty string

When building LLVM as a (potentially dynamic) library that can be linked against
by multiple compilers, the default triple is not really meaningful.
We allow to explicitely set it to an empty string when configuring LLVM.
In this case, said "target independent" tests in the test suite that are using
the default triple are disabled by matching the newly available feature
"default_triple".

Reviewers: probinson, echristo
Differential Revision: http://reviews.llvm.org/D12660

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 247775

1 files changed, 95 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/Generic/namespace_inline_function_definition.ll b/llvm/test/DebugInfo/Generic/namespace_inline_function_definition.ll
new file mode 100644
index 00000000000..bc606198ce9
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/namespace_inline_function_definition.ll
@@ -0,0 +1,95 @@
+; REQUIRES: object-emission
+
+; RUN: %llc_dwarf -O0 -filetype=obj -dwarf-linkage-names=Enable < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
+
+; Generate from clang with the following source. Note that the definition of
+; the inline function follows its use to workaround another bug that should be
+; fixed soon.
+; namespace ns {
+; int func(int i);
+; }
+; extern int x;
+; int main() { return ns::func(x); }
+; int __attribute__((always_inline)) ns::func(int i) { return i * 2; }
+
+; CHECK: DW_TAG_namespace
+; CHECK-NEXT: DW_AT_name {{.*}} "ns"
+; CHECK-NOT: DW_TAG
+; CHECK:   DW_TAG_subprogram
+; CHECK-NOT: DW_TAG
+; CHECK:   DW_AT_linkage_name {{.*}} "_ZN2ns4funcEi"
+; CHECK-NOT: DW_TAG
+; CHECK:   DW_TAG_formal_parameter
+; CHECK:   NULL
+; CHECK-NOT: NULL
+; CHECK:   DW_TAG_subprogram
+; CHECK-NOT: DW_TAG
+; CHECK:     DW_AT_abstract_origin {{.*}} "_ZN2ns4funcEi"
+; CHECK-NOT: DW_TAG
+; CHECK:     DW_TAG_formal_parameter
+; CHECK:       DW_AT_abstract_origin {{.*}} "i"
+; CHECK:     NULL
+; CHECK:   NULL
+; CHECK: NULL
+
+@x = external global i32
+
+; Function Attrs: uwtable
+define i32 @main() #0 {
+entry:
+  %i.addr.i = alloca i32, align 4
+  %retval = alloca i32, align 4
+  store i32 0, i32* %retval
+  %0 = load i32, i32* @x, align 4, !dbg !16
+  store i32 %0, i32* %i.addr.i, align 4
+  call void @llvm.dbg.declare(metadata i32* %i.addr.i, metadata !117, metadata !DIExpression()), !dbg !18
+  %1 = load i32, i32* %i.addr.i, align 4, !dbg !18
+  %mul.i = mul nsw i32 %1, 2, !dbg !18
+  ret i32 %mul.i, !dbg !16
+}
+
+; Function Attrs: alwaysinline nounwind uwtable
+define i32 @_ZN2ns4funcEi(i32 %i) #1 {
+entry:
+  %i.addr = alloca i32, align 4
+  store i32 %i, i32* %i.addr, align 4
+  call void @llvm.dbg.declare(metadata i32* %i.addr, metadata !17, metadata !DIExpression()), !dbg !19
+  %0 = load i32, i32* %i.addr, align 4, !dbg !19
+  %mul = mul nsw i32 %0, 2, !dbg !19
+  ret i32 %mul, !dbg !19
+}
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
+
+attributes #0 = { uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { alwaysinline nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #2 = { nounwind readnone }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!13, !14}
+!llvm.ident = !{!15}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!1 = !DIFile(filename: "namespace_inline_function_definition.cpp", directory: "/tmp/dbginfo")
+!2 = !{}
+!3 = !{!4, !9}
+!4 = distinct !DISubprogram(name: "main", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 5, file: !1, scope: !5, type: !6, function: i32 ()* @main, variables: !2)
+!5 = !DIFile(filename: "namespace_inline_function_definition.cpp", directory: "/tmp/dbginfo")
+!6 = !DISubroutineType(types: !7)
+!7 = !{!8}
+!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!9 = distinct !DISubprogram(name: "func", linkageName: "_ZN2ns4funcEi", line: 6, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 6, file: !1, scope: !10, type: !11, function: i32 (i32)* @_ZN2ns4funcEi, variables: !2)
+!10 = !DINamespace(name: "ns", line: 1, file: !1, scope: null)
+!11 = !DISubroutineType(types: !12)
+!12 = !{!8, !8}
+!13 = !{i32 2, !"Dwarf Version", i32 4}
+!14 = !{i32 2, !"Debug Info Version", i32 3}
+!15 = !{!"clang version 3.5.0 "}
+!16 = !DILocation(line: 5, scope: !4)
+!17 = !DILocalVariable(name: "i", line: 6, arg: 1, scope: !9, file: !5, type: !8)
+
+!117 = !DILocalVariable(name: "i", line: 6, arg: 1, scope: !9, file: !5, type: !8)
+
+!18 = !DILocation(line: 6, scope: !9, inlinedAt: !16)
+!19 = !DILocation(line: 6, scope: !9)