Make sure we emit a section for pubnames even if that section is

going to be empty. This is particularly important for the gnu
pubnames case since we're emitting a relocation to the section.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191915 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 2acbaf763185340d2c418687ae222037a76a0f71..1e08e2cd3a47bd309e4c9fc7c26048122ea27b1f 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -2427,9 +2427,6 @@ void DwarfDebug::emitDebugPubNames(bool GnuStyle) {
     CompileUnit *TheCU = I->second;
     unsigned ID = TheCU->getUniqueID();
 
-    if (TheCU->getGlobalNames().empty())
-      continue;
-
     // Start the dwarf pubnames section.
     Asm->OutStreamer.SwitchSection(PSec);
 

diff --git a/test/DebugInfo/X86/gnu-public-names-empty.ll b/test/DebugInfo/X86/gnu-public-names-empty.ll
new file mode 100644 (file)
index 0000000..2f5787a
--- /dev/null
+++ b/test/DebugInfo/X86/gnu-public-names-empty.ll
@@ -0,0 +1,18 @@
+; RUN: llc -mtriple=x86_64-pc-linux-gnu -generate-gnu-dwarf-pub-sections -filetype=obj < %s | llvm-dwarfdump - | FileCheck %s
+
+; Generated from:
+
+; static int a __attribute__((section("a")));
+
+; Check that the attributes in the compile unit both point to a correct
+; location, even when nothing is exported.
+; CHECK: DW_AT_GNU_pubnames [DW_FORM_sec_offset]   (0x00000000)
+; CHECK: DW_AT_GNU_pubtypes [DW_FORM_sec_offset]   (0x00000000)
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3}
+
+!0 = metadata !{i32 786449, metadata !1, i32 12, metadata !"clang version 3.4 (trunk 191846) (llvm/trunk 191866)", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !2, metadata !2, metadata !2, metadata !""} ; [ DW_TAG_compile_unit ] [/usr/local/google/home/echristo/tmp/foo.c] [DW_LANG_C99]
+!1 = metadata !{metadata !"foo.c", metadata !"/usr/local/google/home/echristo/tmp"}
+!2 = metadata !{i32 0}
+!3 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}