ValueMap.MD()[CU->getRawEnumTypes()].reset(nullptr);
ValueMap.MD()[CU->getRawMacros()].reset(nullptr);
ValueMap.MD()[CU->getRawRetainedTypes()].reset(nullptr);
+ // The original definition (or at least its debug info - if the variable is
+ // internalized an optimized away) will remain in the source module, so
+ // there's no need to import them.
+ // If LLVM ever does more advanced optimizations on global variables
+ // (removing/localizing write operations, for instance) that can track
+ // through debug info, this decision may need to be revisited - but do so
+ // with care when it comes to debug info size. Emitting small CUs containing
+ // only a few imported entities into every destination module may be very
+ // size inefficient.
+ ValueMap.MD()[CU->getRawGlobalVariables()].reset(nullptr);
// Imported entities only need to be mapped in if they have local
// scope, as those might correspond to an imported entity inside a
; IMPORT: @gFoo.llvm.0 = internal unnamed_addr global i32 1, align 4, !dbg !0
; IMPORT-NEXT: @gBar = internal local_unnamed_addr global i32 2, align 4, !dbg !5
-; IMPORT: !DICompileUnit({{.*}}, globals: !{{[0-9]+}})
+; IMPORT: !DICompileUnit({{.*}})
; OPTIMIZE: define i32 @main
; OPTIMIZE-NEXT: ret i32 3
; IMPORT: @gFoo.llvm.0 = internal unnamed_addr global i32 1, align 4
; IMPORT-NEXT: @gBar = internal local_unnamed_addr global i32 2, align 4
-; IMPORT: !DICompileUnit({{.*}}, globals: !{{[0-9]+}})
+; IMPORT: !DICompileUnit({{.*}})
; CODEGEN: i32 @main()
; CODEGEN-NEXT: ret i32 3