diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp b/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
@@ -341,7 +341,9 @@
       break;
 
     case DW_AT_decl_file:
-      decl.SetFile(die.GetCU()->GetFile(form_value.Unsigned()));
+      // die.GetCU() can differ if DW_AT_specification uses DW_FORM_ref_addr.
+      decl.SetFile(
+          attributes.CompileUnitAtIndex(i)->GetFile(form_value.Unsigned()));
       break;
     case DW_AT_decl_line:
       decl.SetLine(form_value.Unsigned());
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFAttribute.h b/lldb/source/Plugins/SymbolFile/DWARF/DWARFAttribute.h
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFAttribute.h
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFAttribute.h
@@ -52,11 +52,9 @@
   DWARFAttributes();
   ~DWARFAttributes();
 
-  void Append(const DWARFUnit *cu, dw_offset_t attr_die_offset,
-              dw_attr_t attr, dw_form_t form);
-  const DWARFUnit *CompileUnitAtIndex(uint32_t i) const {
-    return m_infos[i].cu;
-  }
+  void Append(DWARFUnit *cu, dw_offset_t attr_die_offset, dw_attr_t attr,
+              dw_form_t form);
+  DWARFUnit *CompileUnitAtIndex(uint32_t i) const { return m_infos[i].cu; }
   dw_offset_t DIEOffsetAtIndex(uint32_t i) const {
     return m_infos[i].die_offset;
   }
@@ -73,8 +71,8 @@
 
 protected:
   struct AttributeValue {
-    const DWARFUnit *cu;        // Keep the compile unit with each attribute in
-                                // case we have DW_FORM_ref_addr values
+    DWARFUnit *cu; // Keep the compile unit with each attribute in
+                   // case we have DW_FORM_ref_addr values
     dw_offset_t die_offset;
     DWARFAttribute attr;
   };
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFAttribute.cpp b/lldb/source/Plugins/SymbolFile/DWARF/DWARFAttribute.cpp
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFAttribute.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFAttribute.cpp
@@ -25,7 +25,7 @@
   return UINT32_MAX;
 }
 
-void DWARFAttributes::Append(const DWARFUnit *cu, dw_offset_t attr_die_offset,
+void DWARFAttributes::Append(DWARFUnit *cu, dw_offset_t attr_die_offset,
                              dw_attr_t attr, dw_form_t form) {
   AttributeValue attr_value = {
       cu, attr_die_offset, {attr, form, DWARFFormValue::ValueType()}};
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.h b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.h
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.h
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.h
@@ -49,7 +49,7 @@
                const DWARFUnit *cu, lldb::offset_t *offset_ptr);
 
   using Recurse = DWARFBaseDIE::Recurse;
-  size_t GetAttributes(const DWARFUnit *cu, DWARFAttributes &attrs,
+  size_t GetAttributes(DWARFUnit *cu, DWARFAttributes &attrs,
                        Recurse recurse = Recurse::yes) const {
     return GetAttributes(cu, attrs, recurse, 0 /* curr_depth */);
   }
@@ -180,8 +180,8 @@
   dw_tag_t m_tag = llvm::dwarf::DW_TAG_null;
 
 private:
-  size_t GetAttributes(const DWARFUnit *cu, DWARFAttributes &attrs,
-                       Recurse recurse, uint32_t curr_depth) const;
+  size_t GetAttributes(DWARFUnit *cu, DWARFAttributes &attrs, Recurse recurse,
+                       uint32_t curr_depth) const;
 };
 
 #endif // LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFDEBUGINFOENTRY_H
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.cpp b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.cpp
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.cpp
@@ -399,7 +399,7 @@
 // specification or abstract origin attributes and including those in the
 // results. Any duplicate attributes will have the first instance take
 // precedence (this can happen for declaration attributes).
-size_t DWARFDebugInfoEntry::GetAttributes(const DWARFUnit *cu,
+size_t DWARFDebugInfoEntry::GetAttributes(DWARFUnit *cu,
                                           DWARFAttributes &attributes,
                                           Recurse recurse,
                                           uint32_t curr_depth) const {
diff --git a/lldb/test/Shell/SymbolFile/DWARF/DW_AT_decl_file-DW_AT_specification-crosscu.s b/lldb/test/Shell/SymbolFile/DWARF/DW_AT_decl_file-DW_AT_specification-crosscu.s
new file mode 100644
--- /dev/null
+++ b/lldb/test/Shell/SymbolFile/DWARF/DW_AT_decl_file-DW_AT_specification-crosscu.s
@@ -0,0 +1,202 @@
+# Check that DW_AT_decl_file inherited by DW_AT_specification from a different
+# DW_TAG_compile_unit is using the DW_TAG_compile_unit->DW_AT_stmt_list where the
+# DW_AT_decl_file is located (and not where the DW_AT_specification is located).
+
+# REQUIRES: x86
+
+# RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux %s -o %t
+# RUN: %lldb %t \
+# RUN:   -o "image lookup -v -n main" \
+# RUN:   -o exit | FileCheck %s
+
+# CHECK: FuncType: id = {0x0000002a}, byte-size = 0, decl = filename1:1, compiler_type = "int (void)"
+
+	.text
+	.globl	main                            # -- Begin function main
+	.type	main,@function
+main:                                           # @main
+.Lfunc_begin0:
+        .byte 0
+.Lfunc_end0:
+	.size	main, .Lfunc_end0-main
+                                                # -- End function
+	.section	.debug_abbrev,"",@progbits
+	.byte	1                               # Abbreviation Code
+	.byte	17                              # DW_TAG_compile_unit
+	.byte	1                               # DW_CHILDREN_yes
+	.byte	37                              # DW_AT_producer
+	.byte	14                              # DW_FORM_strp
+	.byte	19                              # DW_AT_language
+	.byte	5                               # DW_FORM_data2
+	.byte	3                               # DW_AT_name
+	.byte	14                              # DW_FORM_strp
+	.byte	16                              # DW_AT_stmt_list
+	.byte	23                              # DW_FORM_sec_offset
+	.byte	27                              # DW_AT_comp_dir
+	.byte	14                              # DW_FORM_strp
+	.byte	17                              # DW_AT_low_pc
+	.byte	1                               # DW_FORM_addr
+	.byte	18                              # DW_AT_high_pc
+	.byte	6                               # DW_FORM_data4
+	.byte	0                               # EOM(1)
+	.byte	0                               # EOM(2)
+	.byte	2                               # Abbreviation Code
+	.byte	46                              # DW_TAG_subprogram
+	.byte	0                               # DW_CHILDREN_no
+	.byte	3                               # DW_AT_name
+	.byte	14                              # DW_FORM_strp
+	.byte	17                              # DW_AT_low_pc
+	.byte	1                               # DW_FORM_addr
+	.byte	18                              # DW_AT_high_pc
+	.byte	6                               # DW_FORM_data4
+	.byte	64                              # DW_AT_frame_base
+	.byte	24                              # DW_FORM_exprloc
+	.byte	71                              # DW_AT_specification
+	.byte	16                              # DW_FORM_ref_addr
+	.byte	0                               # EOM(1)
+	.byte	0                               # EOM(2)
+	.byte	3                               # Abbreviation Code
+	.byte	36                              # DW_TAG_base_type
+	.byte	0                               # DW_CHILDREN_no
+	.byte	3                               # DW_AT_name
+	.byte	14                              # DW_FORM_strp
+	.byte	62                              # DW_AT_encoding
+	.byte	11                              # DW_FORM_data1
+	.byte	11                              # DW_AT_byte_size
+	.byte	11                              # DW_FORM_data1
+	.byte	0                               # EOM(1)
+	.byte	0                               # EOM(2)
+	.byte	4                               # Abbreviation Code
+	.byte	46                              # DW_TAG_subprogram
+	.byte	0                               # DW_CHILDREN_no
+	.byte	58                              # DW_AT_decl_file
+	.byte	11                              # DW_FORM_data1
+	.byte	59                              # DW_AT_decl_line
+	.byte	11                              # DW_FORM_data1
+	.byte	39                              # DW_AT_prototyped
+	.byte	25                              # DW_FORM_flag_present
+	.byte	73                              # DW_AT_type
+	.byte	19                              # DW_FORM_ref4
+	.byte	63                              # DW_AT_external
+	.byte	25                              # DW_FORM_flag_present
+	.byte	60                              # DW_AT_declaration
+	.byte	25                              # DW_FORM_flag_present
+	.byte	0                               # EOM(1)
+	.byte	0                               # EOM(2)
+	.byte	0                               # EOM(3)
+
+	.section	.debug_info,"",@progbits
+.Ldebug_cu0:
+
+	.long	.Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+	.short	4                               # DWARF version number
+	.long	.debug_abbrev                   # Offset Into Abbrev. Section
+	.byte	8                               # Address Size (in bytes)
+	.byte	1                               # Abbrev [1] 0xb:0x40 DW_TAG_compile_unit
+	.long	.Linfo_string_producer          # DW_AT_producer
+	.short	12                              # DW_AT_language
+	.long	.Linfo_string_source            # DW_AT_name
+	.long	.Lline_table_start0             # DW_AT_stmt_list
+	.long	.Linfo_string_directory         # DW_AT_comp_dir
+	.quad	.Lfunc_begin0                   # DW_AT_low_pc
+	.long	.Lfunc_end0-.Lfunc_begin0       # DW_AT_high_pc
+	.byte	2                               # Abbrev [2] 0x2a:0x19 DW_TAG_subprogram
+	.long	.Linfo_string_main              # DW_AT_name
+	.quad	.Lfunc_begin0                   # DW_AT_low_pc
+	.long	.Lfunc_end0-.Lfunc_begin0       # DW_AT_high_pc
+	.byte	1                               # DW_AT_frame_base
+	.byte	86
+	.long	.Ldebug_info1_main - .Ldebug_cu0 # DW_AT_specification
+	.byte	0                               # End Of Children Mark
+.Ldebug_info_end0:
+
+.Ldebug_info1:
+	.long	.Ldebug_info_end1-.Ldebug_info_start1 # Length of Unit
+.Ldebug_info_start1:
+	.short	4                               # DWARF version number
+	.long	.debug_abbrev                   # Offset Into Abbrev. Section
+	.byte	8                               # Address Size (in bytes)
+	.byte	1                               # Abbrev [1] 0xb:0x40 DW_TAG_compile_unit
+	.long	.Linfo_string_producer          # DW_AT_producer
+	.short	12                              # DW_AT_language
+	.long	.Linfo_string_source            # DW_AT_name
+	.long	.Lline_table_start1             # DW_AT_stmt_list
+	.long	.Linfo_string_directory         # DW_AT_comp_dir
+	.quad	.Lfunc_begin0                   # DW_AT_low_pc
+	.long	.Lfunc_end0-.Lfunc_begin0       # DW_AT_high_pc
+.Ldebug_info1_main:
+	.byte	4                               # Abbrev [2] 0x2a:0x19 DW_TAG_subprogram
+	.byte	1                               # DW_AT_decl_file
+	.byte	1                               # DW_AT_decl_line
+                                                # DW_AT_prototyped
+	.long	.Ldebug_info1_int - .Ldebug_info1 # DW_AT_type
+                                                # DW_AT_external
+.Ldebug_info1_int:
+	.byte	3                               # Abbrev [3] 0x43:0x7 DW_TAG_base_type
+	.long	.Linfo_string_int               # DW_AT_name
+	.byte	5                               # DW_AT_encoding
+	.byte	4                               # DW_AT_byte_size
+	.byte	0                               # End Of Children Mark
+.Ldebug_info_end1:
+
+	.section	.debug_str,"MS",@progbits,1
+.Linfo_string_producer:
+	.asciz	"clang version 12.0.0" # string offset=0
+.Linfo_string_source:
+	.asciz	"source.c" # string offset=130
+.Linfo_string_directory:
+	.asciz	"/directory" # string offset=196
+.Linfo_string_main:
+	.asciz	"main"
+.Linfo_string_int:
+	.asciz	"int"
+	.ident	"clang version 12.0.0"
+	.section	".note.GNU-stack","",@progbits
+	.addrsig
+
+	.section	.debug_line,"",@progbits
+
+.Lline_table_start0:
+        .long .Lline_table_end0 - 1f  # length from next byte
+1:
+        .short 4                      # version
+        .long .Lline_table_end0 - 2f  # prologue length from next byte
+2:
+        .byte 1                       # minimum instruction length
+        .byte 1                       # maximum ops per instruction
+        .byte 1                       # initial value of is_stmt
+        .byte -5                      # line base
+        .byte 14                      # line range
+        .byte 1                       # opcode base
+                                      # no standard opcodes
+        .asciz "directory0"
+        .byte 0                       # last directory
+        .asciz "filename0"
+        .uleb128 1                    # directory entry
+        .uleb128 0                    # time
+        .uleb128 0                    # file length
+        .byte 0                       # last filename
+.Lline_table_end0:
+
+.Lline_table_start1:
+        .long .Lline_table_end1 - 1f  # length from next byte
+1:
+        .short 4                      # version
+        .long .Lline_table_end1 - 2f  # prologue length from next byte
+2:
+        .byte 1                       # minimum instruction length
+        .byte 1                       # maximum ops per instruction
+        .byte 1                       # initial value of is_stmt
+        .byte -5                      # line base
+        .byte 14                      # line range
+        .byte 1                       # opcode base
+                                      # no standard opcodes
+        .asciz "directory1"
+        .byte 0                       # last directory
+        .asciz "filename1"
+        .uleb128 1                    # directory entry
+        .uleb128 0                    # time
+        .uleb128 0                    # file length
+        .byte 0                       # last filename
+.Lline_table_end1: