LD.LLD(1) | General Commands Manual | LD.LLD(1)

# NAME

`ld.lld` — ELF linker from the LLVM project

# SYNOPSIS

`ld.lld` | [options] objfile ...

# DESCRIPTION

A linker takes one or more object, archive, and library files, and combines them into an output file (an executable, a shared library, or another object file). It relocates code and data from the input files and resolves symbol references between them.

`ld.lld` is a drop-in replacement for the GNU BFD and gold linkers. It accepts most of the same command line arguments and linker scripts as GNU linkers.

`ld.lld` currently supports i386, x86-64, ARM, AArch64, LoongArch, PowerPC32, PowerPC64, MIPS32, MIPS64, RISC-V, AMDGPU, Hexagon and SPARC V9 targets. `ld.lld` acts as a Microsoft link.exe-compatible linker if invoked as `lld-link` and as macOS's ld if invoked as `ld.ld64.` All these targets are always supported however `ld.lld` was built, so you can always use `ld.lld` as a native linker as well as a cross linker.

# OPTIONS

Many options have both a single-letter and long form. When using the long form options other than those beginning with the letter `o` may be specified using either one or two dashes preceding the option name. Long options beginning with `o` require two dashes to avoid confusion with the `-o` path option.

`--allow-multiple-definition`
  Do not error if a symbol is defined multiple times. The first definition will be used.
`--allow-shlib-undefined`
  Allow unresolved references in shared libraries. This option is enabled by default when linking a shared library.
`--apply-dynamic-relocs`
  Apply link-time values for dynamic relocations.
`--as-needed`
  Only set `DT_NEEDED` for shared libraries if used.
`--auxiliary`=value
  Set the `DT_AUXILIARY` field to the specified name.
`--Bdynamic`, `--dy`
  Link against shared libraries.
`--Bstatic`, `--static`, `--dn`
  Do not link against shared libraries.
`-Bno-symbolic`
  Don't bind default visibility defined symbols locally for `-shared` (default).
`-Bsymbolic`
  Bind default visibility defined symbols locally for `-shared.` Also set the `DF_SYMBOLIC` flag.
`-Bsymbolic-non-weak`
  Bind default visibility defined STB_GLOBAL symbols locally for `-shared.`
`-Bsymbolic-functions`
  Bind default visibility defined function symbols locally for `-shared.`
`-Bsymbolic-non-weak-functions`
  Bind default visibility defined STB_GLOBAL function symbols locally for `-shared.`
`---be8`
  Write a Big Endian ELF File using BE8 format(AArch32 only)
`--build-id`=value
  Generate a build ID note. value may be one of `fast`, `md5`, `sha1`, `tree`, `uuid`, `0x` hex-string, and `none`. `tree` is an alias for `sha1`. Build-IDs of type `fast`, `md5`, `sha1`, and `tree` are calculated from the object contents. `fast` is not intended to be cryptographically secure.
`--build-id`
  Synonym for `--build-id`=`sha1`.
`--call-graph-profile-sort`=algorithm
  algorithm may be:

  `none`
    Ignore call graph profile.
  `hfsort`
    Use hfsort.
  `cdsort`
    Use cdsort (default).
`--color-diagnostics`=value
  Use colors in diagnostics. value may be one of `always`, `auto`, and `never`. `auto` enables color if and only if output is to a terminal.
`--color-diagnostics`
  Alias for `--color-diagnostics`=`auto`.
`--compress-debug-sections`=value
  Compress DWARF debug sections. The sections remain uncompressed if compressed content would be larger. `value` may be

  `none`
    No compression.
  `zlib`
    The default compression level is 1 (fastest) as the debug info usually compresses well at that level.
  `zstd`
    Use the default compression level in zstd.
`--compress-sections`=section-glob={none,zlib,zstd}[:level]
  Compress output sections that match the glob and do not have the SHF_ALLOC flag. The matched sections remain uncompressed if compressed content would be larger. The compression level is `level` (if specified) or a default speed-focused level. This is like a generalized `--compress-debug-sections.`
`--cref`
  Output cross reference table. If `-Map` is specified, print to the map file.
`--debug-names`
  Generate a merged `.debug_names` section.
`--default-script`=file, `-dT` file
  In the absence of `--script`, read this default linker script.
`--defsym`=symbol=expression
  Define a symbol alias. expression may be another symbol or a linker script expression. For example, ‘`--defsym=foo=bar`’ or ‘`--defsym=foo=bar+0x100`’.
`--demangle`
  Demangle symbol names.
`--disable-new-dtags`
  Disable new dynamic tags.
`--discard-all`, `-x`
  Delete all local symbols.
`--discard-locals`, `-X`
  Delete temporary local symbols.
`--discard-none`
  Keep all symbols in the symbol table.
`--dynamic-linker`=value
  Specify the dynamic linker to be used for a dynamically linked executable. This is recorded in an ELF segment of type `PT_INTERP`.
`--dynamic-list`=file
  Similar to `--export-dynamic-symbol-list`. When creating a shared object, implies `-Bsymbolic` but does not set DF_SYMBOLIC
`--EB`
  Select the big-endian format in the OUTPUT_FORMAT command.
`--EL`
  Select the little-endian format in the OUTPUT_FORMAT command.
`--eh-frame-hdr`
  Request creation of `.eh_frame_hdr` section and `PT_GNU_EH_FRAME` segment header.
`--emit-relocs`, `-q`
  Generate relocations in the output.
`--enable-new-dtags`
  Enable new dynamic tags.
`--enable-non-contiguous-regions`
  Spill input sections to later matching output sections to avoid memory region overflow.
`--end-lib`
  End a grouping of objects that should be treated as if they were together in an archive.
`--entry`=entry
  Name of entry point symbol.
`--error-limit`=value
  Maximum number of errors to emit before stopping. A value of zero indicates that there is no limit.
`--error-unresolved-symbols`
  Report unresolved symbols as errors.
`--error-handing-script`=script_path
  Call script script_path upon some error, with tag as first argument, and an extra parameter as second argument. The script is expected to return 0 on success. Any other value is considered a generic error. tag may be `missing-lib` followed by the name of the missing library. `undefined-symbol` followed by the name of the undefined symbol.
`--execute-only`
  Mark executable sections unreadable. This option is currently supported on x86-32, x86-64 (default), AArch64 (default), MIPS64, PowerPC32 (default), PowerPC64 (default), RISC-V (default), and SPARC64 (default).
`--exclude-libs`=value
  Exclude static libraries from automatic export.
`--export-dynamic`, `-E`
  Put symbols in the dynamic symbol table.
`--export-dynamic-symbol`=glob
  (executable) Put matched non-local defined symbols to the dynamic symbol table. (shared object) References to matched non-local STV_DEFAULT symbols shouldn't be bound to definitions within the shared object even if they would otherwise be due to `-Bsymbolic` , `-Bsymbolic-functions` or `--dynamic-list`
`--export-dynamic-symbol-list`=file
  Read a list of dynamic symbol patterns from file. Apply `--export-dynamic-symbol` on each pattern.
`--fatal-warnings`
  Treat warnings as errors.
`--filter`=value, `-F` value
  Set the `DT_FILTER` field to the specified value.
`--fini`=symbol
  Specify a finalizer function.
`--force-group-allocation`
  Only meaningful for -r. Section groups are discarded. If two section group members are placed to the same output section, combine their relocations as well.
`--format`=input-format, `-b` input-format
  Specify the format of the inputs following this option. input-format may be one of `binary`, `elf`, and `default`. `default` is a synonym for `elf`.
`--gc-sections`
  Enable garbage collection of unused sections.
`--gdb-index`
  Generate `.gdb_index` section.
`--hash-style`=value
  Specify hash style. value may be `sysv`, `gnu`, or `both`. `both` is the default.
`--help`
  Print a help message.
`--icf`=`all`
  Enable identical code folding.
`--icf`=`safe`
  Enable safe identical code folding.
`--icf`=`none`
  Disable identical code folding.
`--ignore-data-address-equality`
  Ignore address equality of data. C/C++ requires each data to have a unique address. This option allows lld to do unsafe optimization that breaks the requirement: create copies of read-only data or merge two or more read-only data that happen to have the same value.
`--ignore-function-address-equality`
  Ignore address equality of functions. This option allows non-PIC calls to a function with non-default visibility in a shared object. The function may have different addresses within the executable and within the shared object.
`--image-base`=value
  Set the base address to value.
`--init`=symbol
  Specify an initializer function.
`--keep-unique`=symbol
  Do not fold symbol during ICF.
`-l` libName, `--library`=libName
  Root name of library to use.
`-L` dir, `--library-path`=dir
  Add a directory to the library search path.
`--lto-aa-pipeline`=value
  AA pipeline to run during LTO. Used in conjunction with `--lto-newpm-passes`.
`--lto-newpm-passes`=value
  Passes to run during LTO.
`--lto-O` opt-level
  Optimization level for LTO.
`--lto-partitions`=value
  Number of LTO codegen partitions.
`-m` value
  Set target emulation.
`--Map`=file, `-M` file
  Print a link map to file.
`--nmagic`, `-n`
  Do not page align sections, link against static libraries.
`--no-allow-shlib-undefined`
  Do not allow unresolved references in shared libraries. This option is enabled by default when linking an executable.
`--no-as-needed`
  Always set `DT_NEEDED` for shared libraries.
`--no-color-diagnostics`
  Do not use colors in diagnostics.
`--no-demangle`
  Do not demangle symbol names.
`--no-dynamic-linker`
  Inhibit output of an `.interp` section.
`--no-fortran-common`
  Do not search archive members for definitions to override COMMON symbols.
`--no-gc-sections`
  Disable garbage collection of unused sections.
`--no-gnu-unique`
  Disable STB_GNU_UNIQUE symbol binding.
`--no-merge-exidx-entries`
  Disable merging .ARM.exidx entries.
`--no-nmagic`
  Page align sections.
`--no-omagic`
  Do not set the text data sections to be writable, page align sections.
`--no-relax`
  Disable target-specific relaxations. For x86-64 this disables R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX GOT optimization.
`--no-rosegment`
  Do not put read-only non-executable sections in their own segment.
`--undefined-version`
  Do not report version scripts that refer to undefined symbols.
`--no-undefined`
  Report unresolved symbols even if the linker is creating a shared library.
`--no-warn-mismatch`
  Do not reject unknown section types.
`--no-warn-symbol-ordering`
  Do not warn about problems with the symbol ordering file or call graph profile.
`--no-warnings`, `-w`
  Suppress warnings and cancel `--fatal-warnings.`
`--no-whole-archive`
  Restores the default behavior of loading archive members.
`--no-pie`, `--no-pic-executable`
  Do not create a position independent executable.
`--noinhibit-exec`
  Retain the executable output file whenever it is still usable.
`--nostdlib`
  Only search directories specified on the command line.
`-o` path
  Write the output executable, library, or object to path. If not specified, `a.out` is used as a default.
`-O` value
  Optimize output file size. value may be:

  `0`
    Disable string merging.
  `1`
    Enable string merging.
  `2`
    Enable string tail merging.

  `-O` `1` is the default.

`--oformat`=format
  Specify the format for the output object file. The only supported format is `binary`, which produces output with no ELF header.
`--omagic`, `-N`
  Set the text and data sections to be readable and writable, do not page align sections, link against static libraries.
`--opt-remarks-filename` file
  Write optimization remarks in YAML format to file.
`--opt-remarks-passes` pass-regex
  Filter optimization remarks by only allowing the passes matching pass-regex.
`--opt-remarks-with-hotness`
  Include hotness information in the optimization remarks file.
`--orphan-handling`=mode
  Control how orphan sections are handled. An orphan section is one not specifically mentioned in a linker script. mode may be:

  `place`
    Place orphan sections in suitable output sections.
  `warn`
    Place orphan sections as for `place` and also report a warning.
  `error`
    Place orphan sections as for `place` and also report an error.

  `place` is the default.

`--pack-dyn-relocs`=format
  Pack dynamic relocations in the given format. format may be:

  `none`
    Do not pack. Dynamic relocations are encoded in SHT_REL(A).
  `android`
    Pack dynamic relocations in SHT_ANDROID_REL(A).
  `relr`
    Pack relative relocations in SHT_RELR, and the rest of dynamic relocations in SHT_REL(A).
  `android+relr`
    Pack relative relocations in SHT_RELR, and the rest of dynamic relocations in SHT_ANDROID_REL(A).

  `none` is the default. If `--use-android-relr-tags` is specified, use SHT_ANDROID_RELR instead of SHT_RELR.

`--pic-veneer`
  Always generate position independent thunks.
`--pie`, `--pic-executable`
  Create a position independent executable.
`--power10-stubs`=`mode`
  Whether to use Power10 instructions in call stubs for R_PPC64_REL24_NOTOC and TOC/NOTOC interworking. mode may be:

  `yes`
    (default) Use.
  `auto`
    Currently the same as yes.
  `no`
    Don't use.

`--print-gc-sections`
  List removed unused sections.
`--print-icf-sections`
  List identical folded sections.
`--print-map`
  Print a link map to the standard output.
`--print-archive-stats`=file
  Write archive usage statistics to the specified file. Print the numbers of members and fetched members for each archive.
`--push-state`
  Save the current state of `--as-needed`, `--static`, and `--whole-archive.`
`--pop-state`
  Restore the states saved by `--push-state.`
`---relax-gp`
  Enable global pointer relaxation for RISC-V.
`--relocatable`, `-r`
  Create relocatable object file.
`--remap-inputs`=from-glob=to-file
  Input files matching `from-glob` are mapped to `to-file.` Use `/dev/null` to ignore an input file.
`--remap-inputs-file`=file
  Remap input files based on patterns in file. Each line in the remap file is of the format `from-glob=to-file` or a comment starting with `#`.
`--reproduce`=path
  Write a tar file to path, containing all the input files needed to reproduce the link, a text file called response.txt containing the command line options and a text file called version.txt containing the output of ld.lld --version. The archive when unpacked can be used to re-run the linker with the same options and input files.
`--retain-symbols-file`=file
  Retain only the symbols listed in the file.
`--rpath`=value, `-R` value
  Add a `DT_RUNPATH` to the output.
`--rsp-quoting`=value
  Quoting style for response files. The supported values are `windows` and `posix`.
`--script`=file, `-T` file
  Read linker script from file. If multiple linker scripts are given, they are processed as if they were concatenated in the order they appeared on the command line.
`--section-start`=section=address
  Set address of section.
`--shared`, `--Bsharable`
  Build a shared object.
`--shuffle-sections`=seed
  Shuffle matched sections using the given seed before mapping them to the output sections. If -1, reverse the section order. If 0, use a random seed.
`--soname`=value, `-h` value
  Set `DT_SONAME` to value.
`--sort-common`
  This option is ignored for GNU compatibility.
`--sort-section`=value
  Specifies sections sorting rule when linkerscript is used.
`--start-lib`
  Start a grouping of objects that should be treated as if they were together in an archive.
`--strip-all`, `-s`
  Strip all symbols. Implies `--strip-debug`.
`--strip-debug`, `-S`
  Strip debugging information.
`--symbol-ordering-file`=file
  Lay out sections in the order specified by file.
`--sysroot`=value
  Set the system root.
`--target1-abs`
  Interpret `R_ARM_TARGET1` as `R_ARM_ABS32`.
`--target1-rel`
  Interpret `R_ARM_TARGET1` as `R_ARM_REL32`.
`--target2`=type
  Interpret `R_ARM_TARGET2` as type, where type is one of `rel`, `abs`, or `got-rel`.
`--Tbss`=value
  Same as `--section-start` with `.bss` as the sectionname.
`--Tdata`=value
  Same as `--section-start` with `.data` as the sectionname.
`--Ttext`=value
  Same as `--section-start` with `.text` as the sectionname.
`--thinlto-cache-dir`=value
  Path to ThinLTO cached object file directory.
`--thinlto-cache-policy`=value
  Pruning policy for the ThinLTO cache.
`--thinlto-jobs`=value
  Number of ThinLTO jobs.
`--threads`=N
  Number of threads. `all` (default) means all of concurrent threads supported. `1` disables multi-threading.
`--fat-lto-objects`
  Use the .llvm.lto section, which contains LLVM bitcode, in fat LTO object files to perform LTO.
`--no-fat-lto-objects`
  Ignore the .llvm.lto section in relocatable object files (default).
`--time-trace`
  Record time trace.
`--time-trace-file`=file
  Write time trace output to file.
`--time-trace-granularity`=value
  Minimum time granularity (in microseconds) traced by time profiler.
`--trace`
  Print the names of the input files.
`--trace-symbol`=symbol, `-y` symbol
  Trace references to symbol.
`--undefined`=symbol, `-u` symbol
  If symbol is not defined after symbol resolution, and there's a static library that contains an object file defining the symbol, load the member to include the object file in the output file.
`--undefined-glob`=pattern
  Synonym for `--undefined`, except that it takes a glob pattern. In a glob pattern, `*` matches zero or more characters, ? matches any single character, and `[...]` matches the characters within brackets. All symbols that match a given pattern are handled as if they were given as arguments of `--undefined`.
`--unique`
  Creates a separate output section for every orphan input section.
`--unresolved-symbols`=value
  Determine how to handle unresolved symbols.
`--use-android-relr-tags`
  Use SHT_ANDROID_RELR / DT_ANDROID_RELR* tags instead of SHT_RELR / DT_RELR*.
`-v`, `-V`
  Display the version number and proceed with linking if object files are specified.
`--version`
  Display the version number and exit.
`--verbose`
  Verbose mode.
`--version-script`=file
  Read version script from file.
`--warn-backrefs`
  Warn about reverse or cyclic dependencies to or between static archives. This can be used to ensure linker invocation remains compatible with traditional Unix-like linkers.
`--warn-backrefs-exclude`=glob
  Glob describing an archive (or an object file within --start-lib) which should be ignored for `--warn-backrefs`
`--warn-common`
  Warn about duplicate common symbols.
`--warn-ifunc-textrel`
  Warn about using ifunc symbols in conjunction with text relocations. Older versions of glibc library (2.28 and earlier) has a bug that causes the segment that includes ifunc symbols to be marked as not executable when they are relocated. As a result, although the program compiles and links successfully, it gives segmentation fault when the instruction pointer reaches an ifunc symbol. Use -warn-ifunc-textrel to let lld give a warning, if the code may include ifunc symbols, may do text relocations and be linked with an older glibc version. Otherwise, there is no need to use it, as the default value does not give a warning. This flag has been introduced in late 2018, has no counter part in ld and gold linkers, and may be removed in the future.
`--warn-unresolved-symbols`
  Report unresolved symbols as warnings.
`--whole-archive`
  Force load of all members in a static library.
`--why-extract`=file
  Print to a file about why archive members are extracted.
`--wrap`=symbol
  Redirect symbol references to __wrap_symbol and __real_symbol references to symbol.
`-z` option
  Linker option extensions.

  `dead-reloc-in-nonalloc`=section_glob=value
    Resolve a relocation in a matched non-SHF_ALLOC section referencing a discarded symbol to value Accepts globs, in the event of a section matching more than one option, the last option takes precedence. An order of least specific to most specific match is recommended.

  `execstack`
    Make the main stack executable. Stack permissions are recorded in the `PT_GNU_STACK` segment.

  `bti-report`=[none|warning|error]
    Specify how to report the missing GNU_PROPERTY_AARCH64_FEATURE_1_BTI property. `none` is the default, linker will not report the missing property otherwise will be reported as a warning or an error.

  `cet-report`=[none|warning|error]
    Specify how to report the missing GNU_PROPERTY_X86_FEATURE_1_IBT or GNU_PROPERTY_X86_FEATURE_1_SHSTK properties. `none` is the default, linker will not report the missing property otherwise will be reported as a warning or an error.

  `pauth-report`=[none|warning|error]
    Specify how to report the missing GNU_PROPERTY_AARCH64_FEATURE_PAUTH property. `none` is the default, linker will not report the missing property otherwise will be reported as a warning or an error.

  `force-bti`
    Force enable AArch64 BTI instruction in PLT, warn if Input ELF file does not have GNU_PROPERTY_AARCH64_FEATURE_1_BTI property.

  `force-ibt`
    Force enable Intel Indirect Branch Tracking in PLT, warn if an input ELF file does not have GNU_PROPERTY_X86_FEATURE_1_IBT property.

  `global`
    Sets the `DF_1_GLOBAL flag in the` `DYNAMIC` section. Different loaders can decide how to handle this flag on their own.

  `ifunc-noplt`
    Do not emit PLT entries for ifunc symbols. Instead, emit text relocations referencing the resolver. This is an experimental optimization and only suitable for standalone environments where text relocations do not have the usual drawbacks. This option must be combined with the `-z` `notext` option.

  `initfirst`
    Sets the `DF_1_INITFIRST` flag to indicate the module should be initialized first.

  `interpose`
    Set the `DF_1_INTERPOSE` flag to indicate to the runtime linker that the object is an interposer. During symbol resolution interposers are searched after the application but before other dependencies.

  `lrodata-after-bss`
    Place .lrodata after .bss.

  `muldefs`
    Do not error if a symbol is defined multiple times. The first definition will be used. This is a synonym for `--allow-multiple-definition.`

  `nocombreloc`
    Disable combining and sorting multiple relocation sections.

  `nocopyreloc`
    Disable the creation of copy relocations.

  `nodefaultlib`
    Set the `DF_1_NODEFLIB` flag to indicate that default library search paths should be ignored.

  `nodelete`
    Set the `DF_1_NODELETE` flag to indicate that the object cannot be unloaded from a process.

  `nodlopen`
    Set the `DF_1_NOOPEN` flag to indicate that the object may not be opened by dlopen(3).

  `nognustack`
    Do not emit the `PT_GNU_STACK` segment.

  `norelro`
    Do not indicate that portions of the object should be mapped read-only after initial relocation processing. The object will omit the `PT_GNU_RELRO` segment.

  `notext`
    Allow relocations against read-only segments. Sets the `DT_TEXTREL flag in the` `DYNAMIC` section.

  `now`
    Set the `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.

  `origin`
    Set the `DF_ORIGIN` flag to indicate that the object requires $ORIGIN processing.

  `pac-plt`
    AArch64 only, use pointer authentication in PLT.

  `pack-relative-relocs`
    Similar to `-pack-dyn-relocs=relr` , but synthesizes the GLIBC_ABI_DT_RELR version dependency if there is a GLIBC_2.* version dependency. glibc ld.so rejects loading a dynamically linked object without the GLIBC_ABI_DT_RELR version dependency.

  `rel`
    Use REL format for dynamic relocations.

  `rela`
    Use RELA format for dynamic relocations.

  `retpolineplt`
    Emit retpoline format PLT entries as a mitigation for CVE-2017-5715.

  `rodynamic`
    Make the `.dynamic` section read-only. The `DT_DEBUG` tag will not be emitted.

  `separate-loadable-segments`
  `separate-code`
  `noseparate-code`
    Specify whether two adjacent PT_LOAD segments are allowed to overlap in pages. `noseparate-code` (default) allows overlap. `separate-code` allows overlap between two executable segments, or two non-executable segments. `separate-loadable-segments` disallows overlap.

  `shstk`
    x86 only, use shadow stack.

  `stack-size`=size
    Set the main thread's stack size to size. The stack size is recorded as the size of the size. `PT_GNU_STACK` program segment.

  `start-stop-gc`
    Don't let __start_/__stop_ references retain the associated C identifier name sections (default).

  `nostart-stop-gc`
    Let __start_/__stop_ references retain the associated C identifier name sections.

  `text`
    Do not allow relocations against read-only segments. This is the default.

  `wxneeded`
    Create a `PT_OPENBSD_WXNEEDED` segment.

  `nobtcfi`
    Create a `PT_OPENBSD_NOBTCFI` segment.

# ENVIRONMENT VARIABLES

`LLD_REPRODUCE`
  Create a reproduce tarball with the specified filename. If `--reproduce` is specified, `--reproduce` takes precedence.
`LLD_VERSION`
  ld.lld creates a section named `.comment` containing the LLD version string. The version string can be overridden by this environment variable, which is useful to eliminate differences in the binary caused by LLD version number differences.

# IMPLEMENTATION NOTES

`ld.lld`'s handing of archive files (those with a .a file extension) is different from traditional linkers used on Unix-like systems.

Traditional linkers maintain a set of undefined symbols during linking. The linker processes each file in the order in which it appears on the command line, until the set of undefined symbols becomes empty. An object file is linked into the output object when it is encountered, with its undefined symbols added to the set. Upon encountering an archive file a traditional linker searches the objects contained therein, and processes those that satisfy symbols in the unresolved set.

Handling mutually dependent archives may be awkward when using a traditional linker. Archive files may have to be specified multiple times, or the special command line options `--start-group` and `--end-group` may be used to have the linker loop over the files in the group until no new symbols are added to the set.

`ld.lld` records all symbols found in objects and archives as it iterates over command line arguments. When `ld.lld` encounters an undefined symbol that can be resolved by an object file contained in a previously processed archive file, it immediately extracts and links it into the output object.

With certain archive inputs `ld.lld` may produce different results compared to traditional linkers. In practice, large bodies of third party software have been linked with `ld.lld` without material issues.

The `--warn-backrefs` option may be used to identify a linker invocation that may be incompatible with traditional Unix-like linker behavior.

July 25, 2023 | Debian