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, 51 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/Generic/nodebug.ll b/llvm/test/DebugInfo/Generic/nodebug.ll
new file mode 100644
index 00000000000..6f20aecaaf5
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/nodebug.ll
@@ -0,0 +1,51 @@
+; REQUIRES: object-emission
+
+; RUN: %llc_dwarf < %s -filetype=obj | llvm-dwarfdump -debug-dump=info - | FileCheck %s
+
+; Test that a nodebug function (a function not appearing in the debug info IR
+; metadata subprogram list) with DebugLocs on its IR doesn't cause crashes/does
+; the right thing.
+
+; Build with clang from the following:
+; extern int i;
+; inline __attribute__((always_inline)) void f1() {
+;   i = 3;
+; }
+;
+; __attribute__((nodebug)) void f2() {
+;   f1();
+; }
+
+; Check that there's only one DW_TAG_subprogram, nothing for the 'f2' function.
+; CHECK: DW_TAG_subprogram
+; CHECK-NOT: DW_TAG
+; CHECK:   DW_AT_name {{.*}} "f1"
+; CHECK-NOT: DW_TAG_subprogram
+
+@i = external global i32
+
+; Function Attrs: uwtable
+define void @_Z2f2v() #0 {
+entry:
+  store i32 3, i32* @i, align 4, !dbg !11
+  ret void
+}
+
+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" }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!8, !9}
+!llvm.ident = !{!10}
+
+!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: "nodebug.cpp", directory: "/tmp/dbginfo")
+!2 = !{}
+!3 = !{!4}
+!4 = distinct !DISubprogram(name: "f1", linkageName: "_Z2f1v", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 2, file: !1, scope: !5, type: !6, variables: !2)
+!5 = !DIFile(filename: "nodebug.cpp", directory: "/tmp/dbginfo")
+!6 = !DISubroutineType(types: !7)
+!7 = !{null}
+!8 = !{i32 2, !"Dwarf Version", i32 4}
+!9 = !{i32 2, !"Debug Info Version", i32 3}
+!10 = !{!"clang version 3.5.0 "}
+!11 = !DILocation(line: 3, scope: !4)