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, 42 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/Generic/debuginfofinder-forward-declaration.ll b/llvm/test/DebugInfo/Generic/debuginfofinder-forward-declaration.ll
new file mode 100644
index 00000000000..62c151bc8d7
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/debuginfofinder-forward-declaration.ll
@@ -0,0 +1,42 @@
+; RUN: opt -analyze -module-debuginfo < %s | FileCheck %s
+
+
+; This module is generated from the following c-code:
+;
+; > union X;
+; >
+; > struct Y {
+; >     union X *x;
+; > };
+; >
+; > struct Y y;
+
+
+; CHECK: Type: Y from /tmp/minimal.c:3 DW_TAG_structure_type
+; CHECK: Type: x from /tmp/minimal.c:4 DW_TAG_member
+; CHECK: Type: DW_TAG_pointer_type
+; CHECK: Type: X from /tmp/minimal.c:1 DW_TAG_structure_type
+
+
+%struct.Y = type { %struct.X* }
+%struct.X = type opaque
+
+@y = common global %struct.Y zeroinitializer, align 8
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!10, !11}
+!llvm.ident = !{!12}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0 (http://llvm.org/git/clang.git 247b30a043eb8f39ea3708e7e995089da0a6b00f) (http://llvm.org/git/llvm.git 6ecc7365a89c771fd229bdd9ffcc178684ea1aa5)", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2)
+!1 = !DIFile(filename: "minimal.c", directory: "/tmp")
+!2 = !{}
+!3 = !{!4}
+!4 = !DIGlobalVariable(name: "y", scope: !0, file: !1, line: 7, type: !5, isLocal: false, isDefinition: true, variable: %struct.Y* @y)
+!5 = !DICompositeType(tag: DW_TAG_structure_type, name: "Y", file: !1, line: 3, size: 64, align: 64, elements: !6)
+!6 = !{!7}
+!7 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !5, file: !1, line: 4, baseType: !8, size: 64, align: 64)
+!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64, align: 64)
+!9 = !DICompositeType(tag: DW_TAG_structure_type, name: "X", file: !1, line: 1, flags: DIFlagFwdDecl)
+!10 = !{i32 2, !"Dwarf Version", i32 4}
+!11 = !{i32 2, !"Debug Info Version", i32 3}
+!12 = !{!"clang version 3.7.0 (http://llvm.org/git/clang.git 247b30a043eb8f39ea3708e7e995089da0a6b00f) (http://llvm.org/git/llvm.git 6ecc7365a89c771fd229bdd9ffcc178684ea1aa5)"}