DebugInfo: Produce debug_{gnu_}pub{names,types} entries when explicitly requested, even in -gmlt or when empty

Turns out gold doesn't use the DW_AT_GNU_pubnames to decide whether to
parse the rest of the DIEs when building gdb-index. This causes gold to
trip over LLVM's output when there are DW_FORM_ref_addr present.

Gold does use the presence of a debug_gnu_pub{names,types} entry for the
CU to skip parsing the debug_info portion, so make sure that's included
even when empty (technically, when empty there couldn't be any ref_addr
anyway - it only came up when gmlt didn't produce any (even non-empty)
pubnames - but given what that reveals about gold's implementation, this
seems like a good thing to do for consistency).

llvm-svn: 303894

1 files changed, 6 insertions, 2 deletions

diff --git a/llvm/test/DebugInfo/Generic/empty.ll b/llvm/test/DebugInfo/Generic/empty.ll
index d5f738fa027..f8bc2c0f280 100644
--- a/llvm/test/DebugInfo/Generic/empty.ll
+++ b/llvm/test/DebugInfo/Generic/empty.ll
@@ -13,10 +13,14 @@
 ; CHECK-NOT: file_names[
 
 ; CHECK: .debug_pubnames contents:
-; CHECK-NOT: Offset
+; CHECK-NEXT: length = 0x0000000e
+; CHECK-NEXT: Offset
+; CHECK-NEXT: {{^$}}
 
 ; CHECK: .debug_pubtypes contents:
-; CHECK-NOT: Offset
+; CHECK-NEXT: length = 0x0000000e
+; CHECK-NEXT: Offset
+; CHECK-NEXT: {{^$}}
 
 ; Don't emit DW_AT_addr_base when there are no addresses.
 ; FISSION-NOT: DW_AT_GNU_addr_base [DW_FORM_sec_offset]