lld: use now-upstream ld.lld.1
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emaste
parent
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@ -7,7 +7,8 @@ LLD_SRCS= ${LLVM_SRCS}/tools/lld
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PACKAGE= lld
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PROG_CXX= ld.lld
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# Man page directory
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.PATH: ${LLD_SRCS}/docs
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.if (!defined(TOOLS_PREFIX) && ${MK_LLD_IS_LD} != "no") || \
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(defined(TOOLS_PREFIX) && ${MK_LLD_BOOTSTRAP} != "no")
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SYMLINKS= ${PROG_CXX} ${BINDIR}/ld
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@ -1,512 +0,0 @@
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.\"-
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.\" Copyright (c) 2018 Kirill Ponomarev
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.\" Copyright (c) 2018 The FreeBSD Foundation
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 7, 2018
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.Dt LD.LLD 1
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.Os
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.Sh NAME
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.Nm ld.lld
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.Nd ELF linker from the LLVM project
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.Sh SYNOPSIS
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.Nm ld.lld
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.Op Ar options
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.Ar objfile ...
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.Sh DESCRIPTION
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A linker takes one or more object, archive, and library files, and combines
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them into an output file (an executable, a shared library, or another object
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file).
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It relocates code and data from the input files and resolves symbol
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references between them.
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.Pp
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.Nm
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is a drop-in replacement for the GNU BFD and gold linkers.
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It accepts most of the same command line arguments and linker scripts
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as GNU linkers.
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.Pp
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Many options have both a single-letter and long form.
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When using the long form options other than those beginning with the
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letter
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.Cm o
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may be specified using either one or two dashes preceeding the option name.
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Long options beginning with
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.Cm o
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require two dashes to avoid confusion with the
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.Fl o Ar path
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option.
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.Pp
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These options are available:
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.Bl -tag -width indent
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.It Fl -allow-multiple-definition
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Do not error if a symbol is defined multiple times.
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The first definition will be used.
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.It Fl -as-needed
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Only set
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.Dv DT_NEEDED
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for shared libraries if used.
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.It Fl -auxiliary Ar value
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Set the
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.Dv DT_AUXILIARY
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field to the specified name.
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.It Fl -Bdynamic
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Link against shared libraries.
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.It Fl -Bstatic
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Do not link against shared libraries.
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.It Fl -Bsymbolic-functions
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Bind defined function symbols locally.
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.It Fl -Bsymbolic
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Bind defined symbols locally.
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.It Fl -build-id= Ns Ar value
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Generate a build ID note.
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.Ar value
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may be one of
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.Cm md5 ,
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.Cm sha1 ,
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.Cm tree ,
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.Cm uuid ,
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.Cm 0x Ns Ar hex-string ,
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and
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.Cm none .
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.Cm tree
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is an alias for
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.Cm sha1 .
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Build-IDs of type
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.Cm md5 ,
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.Cm sha1 ,
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and
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.Cm tree
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are calculated from the object contents.
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.It Fl -build-id
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Generate a build ID note.
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.It Fl -color-diagnostics= Ns Ar value
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Use colors in diagnostics.
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.Ar value
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may be one of
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.Cm always ,
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.Cm auto ,
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and
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.Cm never .
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.Cm auto
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enables color if and only if output is to a terminal.
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.It Fl -color-diagnostics
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Alias for
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.Fl -color-diagnostics= Ns Cm auto .
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.It Fl -compress-debug-sections= Ns Ar value
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Compress DWARF debug sections.
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.Ar value
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may be
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.Cm none
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or
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.Cm zlib .
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.It Fl -define-common
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Assign space to common symbols.
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.It Fl -defsym= Ns Ar symbol= Ns Ar expression
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Define a symbol alias.
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.Ar expression
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may be another symbol or a linker script expression.
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For example,
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.Fl -defsym= Ns Cm foo= Ns Cm bar
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or
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.Fl -defsym= Ns Cm foo= Ns Cm bar+0x100 .
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.It Fl -demangle
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Demangle symbol names.
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.It Fl -disable-new-dtags
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Disable new dynamic tags.
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.It Fl -discard-all
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Delete all local symbols.
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.It Fl -discard-locals
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Delete temporary local symbols.
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.It Fl -discard-none
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Keep all symbols in the symbol table.
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.It Fl -dynamic-linker Ar value
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Specify the dynamic linker to be used for a dynamically linked executable.
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This is recorded in an ELF segment of type
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.Dv PT_INTERP .
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.It Fl -dynamic-list Ar file
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Read a list of dynamic symbols from
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.Ar file .
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.It Fl -eh-frame-hdr
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Request creation of
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.Li .eh_frame_hdr
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section and
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.Dv PT_GNU_EH_FRAME
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segment header.
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.It Fl -emit-relocs
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Generate relocations in the output.
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.It Fl -enable-new-dtags
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Enable new dynamic tags.
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.It Fl -end-lib
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End a grouping of objects that should be treated as if they were together
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in an archive.
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.It Fl -entry Ar entry
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Name of entry point symbol.
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.It Fl -error-limit Ar value
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Maximum number of errors to emit before stopping.
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A value of zero indicates that there is no limit.
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.It Fl -error-unresolved-symbols
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Report unresolved symbols as errors.
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.It Fl -exclude-libs Ar value
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Exclude static libraries from automatic export.
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.It Fl -export-dynamic-symbol Ar symbol
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Include
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.Ar symbol
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in the dynamic symbol table.
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.It Fl -export-dynamic
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Put symbols in the dynamic symbol table.
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.It Fl -fatal-warnings
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Treat warnings as errors.
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.It Fl -filter= Ns Ar value
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Set the
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.Dv DT_FILTER
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field to the specified value.
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.It Fl -fini Ar symbol
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Specify a finalizer function.
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.It Fl -format= Ns Ar input-format
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Specify the format of the inputs following this option.
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.Ar input-format
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may be one of
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.Cm binary ,
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.Cm elf ,
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and
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.Cm default .
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.Cm default
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is a synonym for
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.Cm elf .
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.It Fl -gc-sections
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Enable garbage collection of unused sections.
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.It Fl -gdb-index
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Generate
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.Li .gdb_index
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section.
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.It Fl -hash-style Ar value
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Specify hash style.
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.Ar value
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may be
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.Cm sysv ,
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.Cm gnu ,
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or
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.Cm both .
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.Cm both
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is the default.
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.It Fl -help
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Print a usage message.
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.It Fl -icf=all
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Enable identical code folding.
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.It Fl -icf=none
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Disable identical code folding.
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.It Fl -image-base= Ns Ar value
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Set the base address to
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.Ar value .
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.It Fl -init Ar symbol
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Specify an initializer function.
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.It Fl -lto-aa-pipeline= Ns Ar value
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AA pipeline to run during LTO.
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Used in conjunction with
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.Fl -lto-newpm-passes .
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.It Fl -lto-newpm-passes= Ns Ar value
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Passes to run during LTO.
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.It Fl -lto-O Ar opt-level
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Optimization level for LTO.
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.It Fl -lto-partitions= Ns Ar value
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Number of LTO codegen partitions.
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.It Fl L Ar dir
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Add a directory to the library search path.
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.It Fl l Ar libName
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Root name of library to use.
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.It Fl -Map Ar file
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Print a link map to
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.Ar file .
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.It Fl m Ar value
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Set target emulation.
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.It Fl -no-as-needed
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Always set
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.Dv DT_NEEDED
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for shared libraries.
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.It Fl -no-color-diagnostics
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Do not use colors in diagnostics.
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.It Fl -no-define-common
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Do not assign space to common symbols.
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.It Fl -no-demangle
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Do not demangle symbol names.
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.It Fl -no-dynamic-linker
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Inhibit output of an
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.Li .interp
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section.
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.It Fl -no-gc-sections
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Disable garbage collection of unused sections.
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.It Fl -no-gnu-unique
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Disable STB_GNU_UNIQUE symbol binding.
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.It Fl -no-rosegment
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Do not put read-only non-executable sections in their own segment.
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.It Fl -no-threads
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Do not run the linker multi-threaded.
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.It Fl -no-undefined-version
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Report version scripts that refer undefined symbols.
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.It Fl -no-undefined
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Report unresolved symbols even if the linker is creating a shared library.
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.It Fl -no-whole-archive
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Restores the default behavior of loading archive members.
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.It Fl -noinhibit-exec
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Retain the executable output file whenever it is still usable.
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.It Fl -no-pie
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Do not create a position independent executable.
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.It Fl -nostdlib
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Only search directories specified on the command line.
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.It Fl -oformat Ar format
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Specify the format for the output object file.
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The only supported
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.Ar format
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is
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.Cm binary ,
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which produces output with no ELF header.
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.It Fl -omagic
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Set the text and data sections to be readable and writable.
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.It Fl -opt-remarks-filename Ar file
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Write optimization remarks in YAML format to
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.Ar file .
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.It Fl -opt-remarks-with-hotness
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Include hotness information in the optimization remarks file.
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.It Fl O Ar value
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Optimize output file size.
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.Ar value
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may be:
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.Bl -tag -width indent
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.It Cm O0
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Disable string merging.
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.It Cm O1
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Enable string merging.
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.It Cm O2
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Enable string tail merging.
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.El
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.Cm O1
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is the default.
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.It Fl o Ar path
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Write the output executable, library, or object to
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.Ar path .
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If not specified,
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.Dv a.out
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is used as a default.
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.It Fl -pie
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Create a position independent executable.
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.It Fl -print-gc-sections
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List removed unused sections.
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.It Fl -print-map
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Print a link map to the standard output.
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.It Fl -relocatable
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Create relocatable object file.
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.It Fl -reproduce Ar value
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Dump linker invocation and input files for debugging.
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.It Fl -retain-symbols-file= Ns Ar file
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Retain only the symbols listed in the file.
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.It Fl -rpath Ar value
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Add a
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.Dv DT_RUNPATH
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to the output.
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.It Fl -rsp-quoting= Ns Ar value
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Quoting style for response files.
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The supported values are
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.Ar windows
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and
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.Ar posix .
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.It Fl -script Ar file
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Read linker script from
|
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.Ar file .
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.It Fl -section-start Ar address
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Set address of section.
|
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.It Fl -shared
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Build a shared object.
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.It Fl -soname= Ns Ar value
|
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Set
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.Dv DT_SONAME
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to
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.Ar value .
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.It Fl -sort-section Ar value
|
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Specifies sections sorting rule when linkerscript is used.
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.It Fl -start-lib
|
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Start a grouping of objects that should be treated as if they were together
|
||||
in an archive.
|
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.It Fl -strip-all
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Strip all symbols.
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.It Fl -strip-debug
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||||
Strip debugging information.
|
||||
.It Fl -symbol-ordering-file Ar file
|
||||
Lay out sections in the order specified by
|
||||
.Ar file .
|
||||
.It Fl -sysroot= Ns Ar value
|
||||
Set the system root.
|
||||
.It Fl -target1-abs
|
||||
Interpret
|
||||
.Dv R_ARM_TARGET1
|
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as
|
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.Dv R_ARM_ABS32 .
|
||||
.It Fl -target1-rel
|
||||
Interpret
|
||||
.Dv R_ARM_TARGET1
|
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as
|
||||
.Dv R_ARM_REL32 .
|
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.It Fl -target2=type
|
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Interpret
|
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.Dv R_ARM_TARGET2
|
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as
|
||||
.Ar type ,
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||||
where
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.Ar type
|
||||
is one of
|
||||
.Li rel ,
|
||||
.Li abs ,
|
||||
or
|
||||
.Li got-rel .
|
||||
.It Fl -Tbss Ar value
|
||||
Same as
|
||||
.Fl -section-start
|
||||
with
|
||||
.Li .bss
|
||||
as the sectionname.
|
||||
.It Fl -Tdata Ar value
|
||||
Same as
|
||||
.Fl -section-start
|
||||
with
|
||||
.Li .data
|
||||
as the sectionname.
|
||||
.It Fl -thinlto-cache-dir= Ns Ar value
|
||||
Path to ThinLTO cached object file directory.
|
||||
.It Fl -thinlto-cache-policy Ar value
|
||||
Pruning policy for the ThinLTO cache.
|
||||
.It Fl -thinlto-jobs= Ns Ar value
|
||||
Number of ThinLTO jobs.
|
||||
.It Fl -threads
|
||||
Run the linker multi-threaded.
|
||||
This option is enabled by default.
|
||||
.It Fl -trace-symbol Ar symbol
|
||||
Trace references to
|
||||
.Ar symbol .
|
||||
.It Fl -trace
|
||||
Print the names of the input files.
|
||||
.It Fl -Ttext Ar value
|
||||
Same as
|
||||
.Fl -section-start
|
||||
with
|
||||
.Li .text
|
||||
as the sectionname.
|
||||
.It Fl -undefined Ar symbol
|
||||
Force
|
||||
.Ar symbol
|
||||
to be an undefined symbol during linking.
|
||||
.It Fl -unresolved-symbols= Ns Ar value
|
||||
Determine how to handle unresolved symbols.
|
||||
.It Fl -verbose
|
||||
Verbose mode.
|
||||
.It Fl -version-script Ar file
|
||||
Read version script from
|
||||
.Ar file .
|
||||
.It Fl V , Fl -version
|
||||
Display the version number and exit.
|
||||
.It Fl v
|
||||
Display the version number and proceed with linking if object files are
|
||||
specified.
|
||||
.It Fl -warn-common
|
||||
Warn about duplicate common symbols.
|
||||
.It Fl -warn-unresolved-symbols
|
||||
Report unresolved symbols as warnings.
|
||||
.It Fl -whole-archive
|
||||
Force load of all members in a static library.
|
||||
.It Fl -wrap Ar symbol
|
||||
Use wrapper functions for symbol.
|
||||
.It Fl z Ar option
|
||||
Linker option extensions.
|
||||
.Bl -tag -width indent
|
||||
.It Cm execstack
|
||||
Make the main stack executable.
|
||||
Stack permissions are recorded in the
|
||||
.Dv PT_GNU_STACK
|
||||
segment.
|
||||
.It Cm muldefs
|
||||
Do not error if a symbol is defined multiple times.
|
||||
The first definition will be used.
|
||||
This is a synonym for
|
||||
.Fl -allow-multiple-definition.
|
||||
.It Cm nocombreloc
|
||||
Disable combining and sorting multiple relocation sections.
|
||||
.It Cm nocopyreloc
|
||||
Disable the creation of copy relocations.
|
||||
.It Cm nodelete
|
||||
Set the
|
||||
.Dv DF_1_NODELETE
|
||||
flag to indicate that the object cannot be unloaded from a process.
|
||||
.It Cm nodlopen
|
||||
Set the
|
||||
.Dv DF_1_NOOPEN
|
||||
flag to indcate that the object may not be opened by
|
||||
.Xr dlopen 3 .
|
||||
.It Cm norelro
|
||||
Do not indicate that portions of the object shold be mapped read-only
|
||||
after initial relocation processing.
|
||||
The object will omit the
|
||||
.Dv PT_GNU_RELRO
|
||||
segment.
|
||||
.It Cm notext
|
||||
Allow relocations against read-only segments.
|
||||
Sets the
|
||||
.Dv DT_TEXTREL flag in the
|
||||
.Dv DYNAMIC
|
||||
section.
|
||||
.It Cm now
|
||||
Set the
|
||||
.Dv DF_BIND_NOW
|
||||
flag to indicate that the run-time loader should perform all relocation
|
||||
processing as part of object initialization.
|
||||
By default relocations may be performed on demand.
|
||||
.It Cm origin
|
||||
Set the
|
||||
.Dv DF_ORIGIN
|
||||
flag to indicate that the object requires
|
||||
$ORIGIN
|
||||
processing.
|
||||
.It Cm retpolineplt
|
||||
Emit retpoline format PLT entries as a mitigation for CVE-2017-5715.
|
||||
.It Cm rodynamic
|
||||
Make the
|
||||
.Li .dynamic
|
||||
section read-only.
|
||||
The
|
||||
.Dv DT_DEBUG
|
||||
tag will not be emitted.
|
||||
.It Cm stack-size= Ns Ar size
|
||||
Set the main thread's stack size to
|
||||
.Ar size .
|
||||
The stack size is recorded as the size of the
|
||||
.Ar size .
|
||||
.Dv PT_GNU_STACK
|
||||
program segment.
|
||||
.It Cm text
|
||||
Do not allow relocations against read-only segments.
|
||||
This is the default.
|
||||
.It Cm wxneeded
|
||||
Create a
|
||||
.Dv PT_OPENBSD_WXNEEDED
|
||||
segment.
|
||||
.El
|
||||
.El
|
||||
Loading…
Reference in New Issue
Block a user