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Diffstat (limited to 'lld/docs/ReleaseNotes.rst')
| -rw-r--r-- | lld/docs/ReleaseNotes.rst | 84 |
1 files changed, 62 insertions, 22 deletions
diff --git a/lld/docs/ReleaseNotes.rst b/lld/docs/ReleaseNotes.rst index 5be348bb1894c..724c0097a9499 100644 --- a/lld/docs/ReleaseNotes.rst +++ b/lld/docs/ReleaseNotes.rst @@ -5,10 +5,6 @@ lld 10.0.0 Release Notes .. contents:: :local: -.. warning:: - These are in-progress notes for the upcoming LLVM 10.0.0 release. - Release notes for previous releases can be found on - `the Download Page <https://releases.llvm.org/download.html>`_. Introduction ============ @@ -33,51 +29,95 @@ ELF Improvements * New ``elf32btsmipn32_fbsd`` and ``elf32ltsmipn32_fbsd`` emulations are supported. -* Relax MIPS ``jalr``and ``jr`` instructions marked by the ``R_MIPS_JALR`` +* Relax MIPS ``jalr`` and ``jr`` instructions marked by the ``R_MIPS_JALR`` relocation. +* For certain "undefined symbol" errors, a definition with a close spelling will be suggested. + (`D67039 <https://reviews.llvm.org/D67039>`_) +* ``extern "C"`` is suggested if an undefined reference is mangled(unmangled) while there + is a likely unmangled(mangled) definition. + (`D69592 <https://reviews.llvm.org/D69592>`_ `D69650 <https://reviews.llvm.org/D69650>`_) +* New ``-z noseparate-code``, ``-z separate-code`` and ``-z separate-loadable-segments``. + ``-z noseparate-code`` is the default, which can reduce sizes of linked binaries by up to + 3 times maxpagesize. + (`D64903 <https://reviews.llvm.org/D64903>`_ `D67481 <https://reviews.llvm.org/D67481>`_) +* ``-z force-bti`` and ``-z pac-plt`` are added for AArch64 Branch Target Identification and Pointer Authentication. + (`D62609 <https://reviews.llvm.org/D62609>`_) +* ``--fix-cortex-a8`` is added to fix erratum 657417. + (`D67284 <https://reviews.llvm.org/D67284>`_) +* ``-z force-ibt`` and ``-z shstk`` are added for Intel Control-flow Enforcement Technology. + (`D59780 <https://reviews.llvm.org/D59780>`_) +* ``PT_GNU_PROPERTY`` is added to help loaders locate the ``.note.gnu.property`` section. + It may be used by a future Linux kernel. + (`D70961 <https://reviews.llvm.org/D70961>`_) +* For ``--compress-debug-sections=zlib``, ``-O0`` and ``-O1`` enable compression level 1 + while ``-O2`` enables compression level 6. ``-O1`` (default) is faster than before. + (`D70658 <https://reviews.llvm.org/D70658>`_) +* Range extension thunks with addends are implemented for AArch64, PowerPC32 and PowerPC64. + (`D70637 <https://reviews.llvm.org/D70637>`_ `D70937 <https://reviews.llvm.org/D70937>`_ + `D73424 <https://reviews.llvm.org/D73424>`_) +* ``R_RISCV_ALIGN`` will be errored because linker relaxation for RISC-V is not supported. + Pass ``-mno-relax`` to disable ``R_RISCV_ALIGN``. + (`D71820 <https://reviews.llvm.org/D71820>`_) +* The ARM port will no longer insert interworking thunks for non STT_FUNC symbols. + (`D73474 <https://reviews.llvm.org/D73474>`_) +* The quality of PowerPC32 port has been greatly improved (canonical PLT, copy + relocations, non-preemptible IFUNC, range extension thunks with addends). + It can link FreeBSD 13.0 userland. +* The PowerPC64 port supports non-preemptible IFUNC. + (`D71509 <https://reviews.llvm.org/D71509>`_) +* lld creates a RO PT_LOAD and a RX PT_LOAD without a linker script. + lld creates a unified RX PT_LOAD with a linker script. + A future release will eliminate this difference and use a RO PT_LOAD and a RX PT_LOAD by default. + The linker script case will require ``--no-rosegment`` to restore the current behavior. +* GNU style compressed debug sections ``.zdebug`` (obsoleted by ``SHF_COMPRESSED``) + are supported for input files, but not for the output. + A future release may drop ``.zdebug`` support. -* Reduced size of linked MIPS binaries. +Breaking changes +---------------- -COFF Improvements ------------------ +* ``-Ttext=$base`` (base is usually 0) is no longer supported. + If PT_PHDR is needed, use ``--image-base=$base`` instead. + If PT_PHDR is not needed, use a linker script with `.text 0 : { *(.text*) }` as the first + output section description. + See https://bugs.llvm.org/show_bug.cgi?id=44715 for more information. + (`D67325 <https://reviews.llvm.org/D67325>`_) +* ``-Ttext-segment`` is no longer supported. Its meaning was different from GNU ld's and + could cause subtle bugs. + (`D70468 <https://reviews.llvm.org/D70468>`_) -* ... MinGW Improvements ------------------ * Allow using custom .edata sections from input object files (for use by Wine) - (`dadc6f248868 <https://reviews.llvm.org/rGdadc6f248868>`) + (`dadc6f248868 <https://reviews.llvm.org/rGdadc6f248868>`_) * Don't implicitly create import libraries unless requested - (`6540e55067e3 <https://reviews.llvm.org/rG6540e55067e3>`) + (`6540e55067e3 <https://reviews.llvm.org/rG6540e55067e3>`_) * Support merging multiple resource object files - (`3d3a9b3b413d <https://reviews.llvm.org/rG3d3a9b3b413d>`) + (`3d3a9b3b413d <https://reviews.llvm.org/rG3d3a9b3b413d>`_) and properly handle the default manifest object files that GCC can pass - (`d581dd501381 <https://reviews.llvm.org/rGd581dd501381>`) + (`d581dd501381 <https://reviews.llvm.org/rGd581dd501381>`_) * Demangle itanium symbol names in warnings/error messages - (`a66fc1c99f3e <https://reviews.llvm.org/rGa66fc1c99f3e>`) + (`a66fc1c99f3e <https://reviews.llvm.org/rGa66fc1c99f3e>`_) * Print source locations for undefined references and duplicate symbols, if possible - (`1d06d48bb346 <https://reviews.llvm.org/rG1d06d48bb346>`) + (`1d06d48bb346 <https://reviews.llvm.org/rG1d06d48bb346>`_) and - (`b38f577c015c <https://reviews.llvm.org/rGb38f577c015c>`) + (`b38f577c015c <https://reviews.llvm.org/rGb38f577c015c>`_) * Look for more filename patterns when resolving ``-l`` options - (`0226c35262df <https://reviews.llvm.org/rG0226c35262df>`) + (`0226c35262df <https://reviews.llvm.org/rG0226c35262df>`_) * Don't error out on duplicate absolute symbols with the same value (which can happen for the default-null symbol for weak symbols) - (`1737cc750c46 <https://reviews.llvm.org/rG1737cc750c46>`) - -MachO Improvements ------------------- + (`1737cc750c46 <https://reviews.llvm.org/rG1737cc750c46>`_) -* Item 1. WebAssembly Improvements ------------------------ |