--- /dev/null
+; RUN: llvm-link %s %S/Inputs/subprogram-linkonce-weak.ll -S -o %t1
+; RUN: FileCheck %s -check-prefix=LW -check-prefix=CHECK <%t1
+; RUN: llvm-link %S/Inputs/subprogram-linkonce-weak.ll %s -S -o %t2
+; RUN: FileCheck %s -check-prefix=WL -check-prefix=CHECK <%t2
+
+; This testcase tests the following flow:
+; - File A defines a linkonce version of @foo which has inlined into @bar.
+; - File B defines a weak version of @foo (different definition).
+; - Linkage rules state File B version of @foo wins.
+; - @bar still has inlined debug info related to the linkonce @foo.
+;
+; This should fix PR22792, although the testcase was hand-written. There's a
+; RUN line with a crasher for llc at the end with checks for the DWARF output.
+
+; The LW prefix means linkonce (this file) first, then weak (the other file).
+; The WL prefix means weak (the other file) first, then linkonce (this file).
+
+; We'll see @bar before @foo if this file is first.
+; LW-LABEL: define i32 @bar(
+; LW: %sum = add i32 %a, %b, !dbg ![[FOOINBAR:[0-9]+]]
+; LW: ret i32 %sum, !dbg ![[BARRET:[0-9]+]]
+; LW-LABEL: define weak i32 @foo(
+; LW: %sum = call i32 @fastadd(i32 %a, i32 %b), !dbg ![[FOOCALL:[0-9]+]]
+; LW: ret i32 %sum, !dbg ![[FOORET:[0-9]+]]
+
+; We'll see @foo before @bar if this file is second.
+; WL-LABEL: define weak i32 @foo(
+; WL: %sum = call i32 @fastadd(i32 %a, i32 %b), !dbg ![[FOOCALL:[0-9]+]]
+; WL: ret i32 %sum, !dbg ![[FOORET:[0-9]+]]
+; WL-LABEL: define i32 @bar(
+; WL: %sum = add i32 %a, %b, !dbg ![[FOOINBAR:[0-9]+]]
+; WL: ret i32 %sum, !dbg ![[BARRET:[0-9]+]]
+
+define i32 @bar(i32 %a, i32 %b) {
+entry:
+ %sum = add i32 %a, %b, !dbg !MDLocation(line: 2, scope: !4,
+ inlinedAt: !MDLocation(line: 12, scope: !3))
+ ret i32 %sum, !dbg !MDLocation(line: 13, scope: !3)
+}
+
+define linkonce i32 @foo(i32 %a, i32 %b) {
+entry:
+ %sum = add i32 %a, %b, !dbg !MDLocation(line: 2, scope: !4)
+ ret i32 %sum, !dbg !MDLocation(line: 3, scope: !4)
+}
+
+!llvm.module.flags = !{!0}
+!0 = !{i32 2, !"Debug Info Version", i32 3}
+
+; CHECK-LABEL: !llvm.dbg.cu =
+; LW-SAME: !{![[LCU:[0-9]+]], ![[WCU:[0-9]+]]}
+; WL-SAME: !{![[WCU:[0-9]+]], ![[LCU:[0-9]+]]}
+!llvm.dbg.cu = !{!1}
+
+; LW: ![[LCU]] = !MDCompileUnit({{.*}} subprograms: ![[LSPs:[0-9]+]]
+; LW: ![[LSPs]] = !{![[BARSP:[0-9]+]], ![[FOOSP:[0-9]+]]}
+; LW: ![[BARSP]] = !MDSubprogram(name: "bar",
+; LW-SAME: function: i32 (i32, i32)* @bar
+; LW: ![[FOOSP]] = {{.*}}!MDSubprogram(name: "foo",
+; LW-NOT: function:
+; LW-SAME: ){{$}}
+; LW: ![[WCU]] = !MDCompileUnit({{.*}} subprograms: ![[WSPs:[0-9]+]]
+; LW: ![[WSPs]] = !{![[WEAKFOOSP:[0-9]+]]}
+; LW: ![[WEAKFOOSP]] = !MDSubprogram(name: "foo",
+; LW-SAME: function: i32 (i32, i32)* @foo
+; LW: ![[FOOINBAR]] = !MDLocation(line: 2, scope: ![[FOOSP]], inlinedAt: ![[BARIA:[0-9]+]])
+; LW: ![[BARIA]] = !MDLocation(line: 12, scope: ![[BARSP]])
+; LW: ![[BARRET]] = !MDLocation(line: 13, scope: ![[BARSP]])
+; LW: ![[FOOCALL]] = !MDLocation(line: 52, scope: ![[WEAKFOOSP]])
+; LW: ![[FOORET]] = !MDLocation(line: 53, scope: ![[WEAKFOOSP]])
+
+; Same as above, but reordered.
+; WL: ![[WCU]] = !MDCompileUnit({{.*}} subprograms: ![[WSPs:[0-9]+]]
+; WL: ![[WSPs]] = !{![[WEAKFOOSP:[0-9]+]]}
+; WL: ![[WEAKFOOSP]] = !MDSubprogram(name: "foo",
+; WL-SAME: function: i32 (i32, i32)* @foo
+; WL: ![[LCU]] = !MDCompileUnit({{.*}} subprograms: ![[LSPs:[0-9]+]]
+; WL: ![[LSPs]] = !{![[BARSP:[0-9]+]], ![[FOOSP:[0-9]+]]}
+; WL: ![[BARSP]] = !MDSubprogram(name: "bar",
+; WL-SAME: function: i32 (i32, i32)* @bar
+; WL: ![[FOOSP]] = {{.*}}!MDSubprogram(name: "foo",
+; Note, for symmetry, this should be "NOT: function:" and "SAME: ){{$}}".
+; WL-SAME: function: i32 (i32, i32)* @foo
+; WL: ![[FOOCALL]] = !MDLocation(line: 52, scope: ![[WEAKFOOSP]])
+; WL: ![[FOORET]] = !MDLocation(line: 53, scope: ![[WEAKFOOSP]])
+; WL: ![[FOOINBAR]] = !MDLocation(line: 2, scope: ![[FOOSP]], inlinedAt: ![[BARIA:[0-9]+]])
+; WL: ![[BARIA]] = !MDLocation(line: 12, scope: ![[BARSP]])
+; WL: ![[BARRET]] = !MDLocation(line: 13, scope: ![[BARSP]])
+
+!1 = !MDCompileUnit(language: DW_LANG_C99, file: !2, subprograms: !{!3, !4}, emissionKind: 1)
+!2 = !MDFile(filename: "bar.c", directory: "/path/to/dir")
+!3 = !MDSubprogram(file: !2, scope: !2, line: 11, name: "bar", function: i32 (i32, i32)* @bar, type: !5)
+!4 = !MDSubprogram(file: !2, scope: !2, line: 1, name: "foo", function: i32 (i32, i32)* @foo, type: !5)
+!5 = !MDSubroutineType(types: !{})
+
+; Crasher for llc.
+; REQUIRES: object-emission
+; RUN: %llc_dwarf -filetype=obj -O0 %t1 -o %t1.o
+; RUN: llvm-dwarfdump %t1.o -debug-dump=all | FileCheck %s -check-prefix=DWLW -check-prefix=DW
+; RUN: %llc_dwarf -filetype=obj -O0 %t2 -o %t2.o
+; RUN: llvm-dwarfdump %t2.o -debug-dump=all | FileCheck %s -check-prefix=DWWL -check-prefix=DW
+; Check that the debug info for the discarded linkonce version of @foo doesn't
+; reference any code, and that the other subprograms look correct.
+
+; DW-LABEL: .debug_info contents:
+; DWLW: DW_TAG_compile_unit
+; DWLW: DW_AT_name {{.*}}"bar.c"
+; DWLW: DW_TAG_subprogram
+; DWLW-NOT: DW_AT_low_pc
+; DWLW-NOT: DW_AT_high_pc
+; DWLW: DW_AT_name {{.*}}foo
+; DWLW: DW_AT_decl_file {{.*}}"/path/to/dir/bar.c"
+; DWLW: DW_AT_decl_line {{.*}}(1)
+; DWLW: DW_TAG_subprogram
+; DWLW: DW_AT_low_pc
+; DWLW: DW_AT_high_pc
+; DWLW: DW_AT_name {{.*}}bar
+; DWLW: DW_AT_decl_file {{.*}}"/path/to/dir/bar.c"
+; DWLW: DW_AT_decl_line {{.*}}(11)
+
+; DWLW: DW_TAG_inlined_subroutine
+; DWLW: DW_AT_abstract_origin
+; DWLW: DW_TAG_compile_unit
+; DWLW: DW_AT_name {{.*}}"foo.c"
+; DWLW: DW_TAG_subprogram
+; DWLW: DW_AT_low_pc
+; DWLW: DW_AT_high_pc
+; DWLW: DW_AT_name {{.*}}foo
+; DWLW: DW_AT_decl_file {{.*}}"/path/to/dir/foo.c"
+; DWLW: DW_AT_decl_line {{.*}}(51)
+
+; The DWARF output is already symmetric (just reordered).
+; DWWL: DW_TAG_compile_unit
+; DWWL: DW_AT_name {{.*}}"foo.c"
+; DWWL: DW_TAG_subprogram
+; DWWL: DW_AT_low_pc
+; DWWL: DW_AT_high_pc
+; DWWL: DW_AT_name {{.*}}foo
+; DWWL: DW_AT_decl_file {{.*}}"/path/to/dir/foo.c"
+; DWWL: DW_AT_decl_line {{.*}}(51)
+; DWWL: DW_TAG_compile_unit
+; DWWL: DW_AT_name {{.*}}"bar.c"
+; DWWL: DW_TAG_subprogram
+; DWWL-NOT: DW_AT_low_pc
+; DWWL-NOT: DW_AT_high_pc
+; DWWL: DW_AT_name {{.*}}foo
+; DWWL: DW_AT_decl_file {{.*}}"/path/to/dir/bar.c"
+; DWWL: DW_AT_decl_line {{.*}}(1)
+; DWWL: DW_TAG_subprogram
+; DWWL: DW_AT_low_pc
+; DWWL: DW_AT_high_pc
+; DWWL: DW_AT_name {{.*}}bar
+; DWWL: DW_AT_decl_file {{.*}}"/path/to/dir/bar.c"
+; DWWL: DW_AT_decl_line {{.*}}(11)
+; DWWL: DW_TAG_inlined_subroutine
+; DWWL: DW_AT_abstract_origin
+
+; DW-LABEL: .debug_line contents:
+; Check that we have the right things in the line table as well.
+
+; DWLW-LABEL: file_names[{{ *}}1]{{.*}} bar.c
+; DWLW: 2 0 1 0 0 is_stmt prologue_end
+; DWLW-LABEL: file_names[{{ *}}1]{{.*}} foo.c
+; DWLW: 52 0 1 0 0 is_stmt prologue_end
+; DWLW-NOT: prologue_end
+
+; DWWL-LABEL: file_names[{{ *}}1]{{.*}} foo.c
+; DWWL: 52 0 1 0 0 is_stmt prologue_end
+; DWWL-LABEL: file_names[{{ *}}1]{{.*}} bar.c
+; DWWL: 2 0 1 0 0 is_stmt prologue_end
+; DWWL-NOT: prologue_end
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