gdb-index: Wire up str_offsets section to avoid incorrect error message about offsets_base

There's still a need for a deeper fix to the way libDebugInfoDWARF error
messages are propagated up to lld - if lld had exited non-zero on this
error message we would've found the issue sooner.

llvm-svn: 368229

lld/ELF/DWARF.cpp

@@ -38,6 +38,7 @@ template <class ELFT> LLDDwarfObj<ELFT>::LLDDwarfObj(ObjFile<ELFT> *obj) {
                 .Case(".debug_info", &infoSection)
                 .Case(".debug_ranges", &rangesSection)
                 .Case(".debug_rnglists", &rnglistsSection)
+                .Case(".debug_str_offsets", &strOffsetsSection)
                 .Case(".debug_line", &lineSection)
                 .Default(nullptr)) {
       m->Data = toStringRef(sec->data());

lld/ELF/DWARF.h

@@ -40,6 +40,10 @@ public:
     return rnglistsSection;
   }
 
+  const llvm::DWARFSection &getStrOffsetsSection() const override {
+    return strOffsetsSection;
+  }
+
   const llvm::DWARFSection &getLineSection() const override {
     return lineSection;
   }
@@ -79,6 +83,7 @@ private:
   LLDDWARFSection infoSection;
   LLDDWARFSection rangesSection;
   LLDDWARFSection rnglistsSection;
+  LLDDWARFSection strOffsetsSection;
   LLDDWARFSection lineSection;
   LLDDWARFSection addrSection;
   StringRef abbrevSection;

lld/test/ELF/gdb-index-rng-lists.s

@@ -1,8 +1,13 @@
 # REQUIRES: x86
 # RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t1.o
-# RUN: ld.lld --gdb-index %t1.o -o %t
+# RUN: ld.lld --gdb-index %t1.o -o %t 2>&1 | FileCheck --check-prefix=LLD %s
 # RUN: llvm-dwarfdump -gdb-index %t | FileCheck %s
 
+# FIXME: Remove this once lld correctly returns non-zero on errors like this
+# There's no other behavior to test hidden behind this error - lld only parses
+# the CU for the address ranges, it doesn't need to decode any strings.
+# LLD-NOT: error:
+
 ## The code contains DWARF v5 sections .debug_rnglists and .debug_addr.
 ## Check we are able to build the correct address
 ## area using address range lists.