Vendor import of lld release_60 branch r325932:

https://llvm.org/svn/llvm-project/lld/branches/release_60@325932

ELF/Driver.cpp

@@ -638,7 +638,7 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) {
   Config->Optimize = args::getInteger(Args, OPT_O, 1);
   Config->OrphanHandling = getOrphanHandling(Args);
   Config->OutputFile = Args.getLastArgValue(OPT_o);
-  Config->Pie = Args.hasFlag(OPT_pie, OPT_no_pie, false);
+  Config->Pie = Args.hasFlag(OPT_pie, OPT_nopie, false);
   Config->PrintGcSections =
       Args.hasFlag(OPT_print_gc_sections, OPT_no_print_gc_sections, false);
   Config->Rpath = getRpath(Args);
@@ -1061,7 +1061,12 @@ template <class ELFT> void LinkerDriver::link(opt::InputArgList &Args) {
     addReservedSymbols();
 
   // Apply version scripts.
-  Symtab->scanVersionScript();
+  //
+  // For a relocatable output, version scripts don't make sense, and
+  // parsing a symbol version string (e.g. dropping "@ver1" from a symbol
+  // name "foo@ver1") rather do harm, so we don't call this if -r is given.
+  if (!Config->Relocatable)
+    Symtab->scanVersionScript();
 
   // Create wrapped symbols for -wrap option.
   for (auto *Arg : Args.filtered(OPT_wrap))

ELF/Options.td

@@ -202,8 +202,6 @@ def no_gnu_unique: F<"no-gnu-unique">,
 def no_merge_exidx_entries: F<"no-merge-exidx-entries">,
   HelpText<"Disable merging .ARM.exidx entries">;
 
-def no_pie: F<"no-pie">, HelpText<"Do not create a position independent executable">;
-
 def no_threads: F<"no-threads">,
   HelpText<"Do not run the linker multi-threaded">;
 
@@ -213,6 +211,8 @@ def no_whole_archive: F<"no-whole-archive">,
 def noinhibit_exec: F<"noinhibit-exec">,
   HelpText<"Retain the executable output file whenever it is still usable">;
 
+def nopie: F<"nopie">, HelpText<"Do not create a position independent executable">;
+
 def no_omagic: Flag<["--"], "no-omagic">, MetaVarName<"<magic>">,
   HelpText<"Do not set the text data sections to be writable">;
 

docs/ReleaseNotes.rst

@@ -5,17 +5,12 @@ LLD 6.0.0 Release Notes
 .. contents::
     :local:
 
-.. warning::
-   These are in-progress notes for the upcoming LLVM 6.0.0 release.
-   Release notes for previous releases can be found on
-   `the Download Page <http://releases.llvm.org/download.html>`_.
-
 Introduction
 ============
 
-This document contains the release notes for the LLD linker, release 6.0.0.
-Here we describe the status of LLD, including major improvements
-from the previous release. All LLD releases may be downloaded
+This document contains the release notes for the lld linker, release 6.0.0.
+Here we describe the status of lld, including major improvements
+from the previous release. All lld releases may be downloaded
 from the `LLVM releases web site <http://llvm.org/releases/>`_.
 
 Non-comprehensive list of changes in this release
@@ -24,20 +19,81 @@ Non-comprehensive list of changes in this release
 ELF Improvements
 ----------------
 
-* Item 1.
+* A lot of bugs and compatibility issues have been identified and fixed as a
+  result of people using lld 5.0 as a standard system linker. In particular,
+  linker script and version script support has significantly improved that
+  it should be able to handle almost all scripts.
+
+* A mitigation for Spectre v2 has been implemented. If you pass ``-z
+  retpolineplt``, lld uses RET instruction instead of JMP instruction in PLT.
+  The option is available for x86 and x86-64.
+
+* Identical Code Folding (ICF) now de-duplicates .eh_frame entries, so lld now
+  generates slightly smaller outputs than before when you pass ``--icf=all``.
+
+* Analysis for ``--as-needed`` is now done after garbage collection. If garbage
+  collector eliminates all sections that use some library, that library is
+  eliminated from DT_NEEDED tags. Previously, the analysis ran before garbage
+  collection.
+
+* Size of code segment is now always rounded up to page size to make sure that
+  unused bytes at end of code segment is filled with trap instructions (such
+  as INT3) instead of zeros.
+
+* lld is now able to generate Android-style compact dynamic relocation table.
+  You can turn on the feature by passing ``--pack-dyn-relocs=android``.
+
+* Debug information is used in more cases when reporting errors.
+
+* ``--gdb-index`` gets faster than before.
+
+* String merging is now multi-threaded, which makes ``-O2`` faster.
+
+* ``--hash-style=both`` is now default instead of ``--hash-style=sysv`` to
+  match the behavior of recent versions of GNU linkers.
+
+* ARM PLT entries automatically use short or long variants.
+
+* lld can now identify and patch a code sequence that triggers AArch64 errata 843419.
+  Add ``--fix-cortex-a53-843419`` to enable the feature.
+
+* lld can now generate thunks for out of range thunks.
+
+* MIPS port now generates all output dynamic relocations using Elf_Rel format only.
+
+* Added handling of the R_MIPS_26 relocation in case of N32/N64 ABIs and
+  generating proper PLT entries.
+
+* The following options have been added: ``--icf=none`` ``-z muldefs``
+  ``--plugin-opt`` ``--no-eh-frame-hdr`` ``--no-gdb-index``
+  ``--orphan-handling={place,discard,warn,error}``
+  ``--pack-dyn-relocs={none,android}`` ``--no-omagic``
+  ``--no-print-gc-sections`` ``--ignore-function-address-equality`` ``-z
+  retpolineplt`` ``--print-icf-sections`` ``--no-pie``
 
 COFF Improvements
 -----------------
 
 * A GNU ld style frontend for the COFF linker has been added for MinGW.
   In MinGW environments, the linker is invoked with GNU ld style parameters;
-  which LLD previously only supported when used as an ELF linker. When
+  which lld previously only supported when used as an ELF linker. When
   a PE/COFF target is chosen, those parameters are rewritten into the
   lld-link style parameters and the COFF linker is invoked instead.
 
 * Initial support for the ARM64 architecture has been added.
 
-MachO Improvements
-------------------
+* New ``--version`` flag.
 
-* Item 1.
+* Significantly improved support for writing PDB Files.
+
+* New ``--rsp-quoting`` flag, like ``clang-cl``.
+
+* ``/manifestuac:no`` no longer incorrectly disables ``/manifestdependency:``.
+
+* Only write ``.manifest`` files if ``/manifest`` is passed.
+
+WebAssembly Improvements
+------------------------
+
+* Initial version of WebAssembly support has landed. You can invoke the
+  WebAssembly linker by ``wasm-ld``.

test/ELF/pie.s

@@ -48,7 +48,7 @@
 # CHECK:         Type: PT_DYNAMIC
 
 ## Check -nopie
-# RUN: ld.lld -no-pie %t1.o -o %t2
+# RUN: ld.lld -nopie %t1.o -o %t2
 # RUN: llvm-readobj -file-headers -r %t2 | FileCheck %s --check-prefix=NOPIE
 # NOPIE-NOT: Type: SharedObject
 

test/ELF/relocatable-versioned.s

@@ -0,0 +1,9 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t1.o
+# RUN: ld.lld -o %t2.o -r %t1.o
+# RUN: llvm-nm %t2.o | FileCheck %s
+# CHECK: foo@VERSION
+
+.global "foo@VERSION"
+"foo@VERSION":
+  ret