Re: How to enable the option '--build-id' to ld ?

[William Tambe <tambewilliam at gmail dot com>]

On Wed, Dec 11, 2019 at 7:42 PM Ian Lance Taylor <iant@google.com> wrote:
>
> On Wed, Dec 11, 2019 at 3:36 PM William Tambe <tambewilliam@gmail.com> wrote:
> >
> > On Wed, Dec 11, 2019 at 10:08 AM Ian Lance Taylor <iant@google.com> wrote:
> > >
> > > On Wed, Dec 11, 2019 at 7:03 AM William Tambe <tambewilliam@gmail.com> wrote:
> > > >
> > > > On Wed, Dec 11, 2019 at 9:29 AM Ian Lance Taylor <iant@google.com> wrote:
> > > > >
> > > > > On Wed, Dec 11, 2019 at 4:45 AM William Tambe <tambewilliam@gmail.com> wrote:
> > > > > >
> > > > > > How to enable the option '--build-id' to ld such that the following
> > > > > > error does not occur:
> > > > > > ld: unrecognized option '--build-id'
> > > > >
> > > > > What system are you running on?
> > > >
> > > > I am using GNU/Linux.
> > >
> > > What is the output of "ld --version"?
> >
> > $ arch-elf-ld --version
> > GNU ld (GNU Binutils) 2.32
> > Copyright (C) 2019 Free Software Foundation, Inc.
> > This program is free software; you may redistribute it under the terms of
> > the GNU General Public License version 3 or (at your option) a later version.
> > This program has absolutely no warranty.
> >
> > >
> > > What is the exact command that you are running, and what is the exact
> > > output that you see from that command?
> >
> > $ arch-elf-ld --build-id objfile.o
> > arch-elf-ld: unrecognized option '--build-id'
> > arch-elf-ld: use the --help option for usage information
>
> Hmmm, I haven't seen arch-elf-ld before.  What is the output of
> arch-elf-ld --help?

I ported Binutils to a new architecture that I call "arch"; I would
like to know what code change I can do such that the option
'--build-id' is recognized.

$ arch-elf-ld --help
Usage: arch-elf-ld [options] file...
Options:
  -a KEYWORD                  Shared library control for HP/UX compatibility
  -A ARCH, --architecture ARCH
                              Set architecture
  -b TARGET, --format TARGET  Specify target for following input files
  -c FILE, --mri-script FILE  Read MRI format linker script
  -d, -dc, -dp                Force common symbols to be defined
  --force-group-allocation    Force group members out of groups
  -e ADDRESS, --entry ADDRESS Set start address
  -E, --export-dynamic        Export all dynamic symbols
  --no-export-dynamic         Undo the effect of --export-dynamic
  -EB                         Link big-endian objects
  -EL                         Link little-endian objects
  -f SHLIB, --auxiliary SHLIB Auxiliary filter for shared object symbol table
  -F SHLIB, --filter SHLIB    Filter for shared object symbol table
  -g                          Ignored
  -G SIZE, --gpsize SIZE      Small data size (if no size, same as --shared)
  -h FILENAME, -soname FILENAME
                              Set internal name of shared library
  -I PROGRAM, --dynamic-linker PROGRAM
                              Set PROGRAM as the dynamic linker to use
  --no-dynamic-linker         Produce an executable with no program
interpreter header
  -l LIBNAME, --library LIBNAME
                              Search for library LIBNAME
  -L DIRECTORY, --library-path DIRECTORY
                              Add DIRECTORY to library search path
  --sysroot=<DIRECTORY>       Override the default sysroot location
  -m EMULATION                Set emulation
  -M, --print-map             Print map file on standard output
  -n, --nmagic                Do not page align data
  -N, --omagic                Do not page align data, do not make text readonly
  --no-omagic                 Page align data, make text readonly
  -o FILE, --output FILE      Set output file name
  -O                          Optimize output file
  --out-implib FILE           Generate import library
  -plugin PLUGIN              Load named plugin
  -plugin-opt ARG             Send arg to last-loaded plugin
  -flto                       Ignored for GCC LTO option compatibility
  -flto-partition=            Ignored for GCC LTO option compatibility
  -fuse-ld=                   Ignored for GCC linker option compatibility
  --map-whole-files           Ignored for gold option compatibility
  --no-map-whole-files        Ignored for gold option compatibility
  -Qy                         Ignored for SVR4 compatibility
  -q, --emit-relocs           Generate relocations in final output
  -r, -i, --relocatable       Generate relocatable output
  -R FILE, --just-symbols FILE
                              Just link symbols (if directory, same as --rpath)
  -s, --strip-all             Strip all symbols
  -S, --strip-debug           Strip debugging symbols
  --strip-discarded           Strip symbols in discarded sections
  --no-strip-discarded        Do not strip symbols in discarded sections
  -t, --trace                 Trace file opens
  -T FILE, --script FILE      Read linker script
  --default-script FILE, -dT  Read default linker script
  -u SYMBOL, --undefined SYMBOL
                              Start with undefined reference to SYMBOL
  --require-defined SYMBOL    Require SYMBOL be defined in the final output
  --unique [=SECTION]         Don't merge input [SECTION | orphan] sections
  -Ur                         Build global constructor/destructor tables
  -v, --version               Print version information
  -V                          Print version and emulation information
  -x, --discard-all           Discard all local symbols
  -X, --discard-locals        Discard temporary local symbols (default)
  --discard-none              Don't discard any local symbols
  -y SYMBOL, --trace-symbol SYMBOL
                              Trace mentions of SYMBOL
  -Y PATH                     Default search path for Solaris compatibility
  -(, --start-group           Start a group
  -), --end-group             End a group
  --accept-unknown-input-arch Accept input files whose architecture
cannot be determined
  --no-accept-unknown-input-arch
                              Reject input files whose architecture is unknown
  --as-needed                 Only set DT_NEEDED for following dynamic
libs if used
  --no-as-needed              Always set DT_NEEDED for dynamic
libraries mentioned on
                                the command line
  -assert KEYWORD             Ignored for SunOS compatibility
  -Bdynamic, -dy, -call_shared
                              Link against shared libraries
  -Bstatic, -dn, -non_shared, -static
                              Do not link against shared libraries
  -Bsymbolic                  Bind global references locally
  -Bsymbolic-functions        Bind global function references locally
  --check-sections            Check section addresses for overlaps (default)
  --no-check-sections         Do not check section addresses for overlaps
  --copy-dt-needed-entries    Copy DT_NEEDED links mentioned inside
DSOs that follow
  --no-copy-dt-needed-entries Do not copy DT_NEEDED links mentioned
inside DSOs that follow
  --cref                      Output cross reference table
  --defsym SYMBOL=EXPRESSION  Define a symbol
  --demangle [=STYLE]         Demangle symbol names [using STYLE]
  --disable-multiple-abs-defs Do not allow multiple definitions with
symbols included
           in filename invoked by -R or --just-symbols
  --embedded-relocs           Generate embedded relocs
  --fatal-warnings            Treat warnings as errors
  --no-fatal-warnings         Do not treat warnings as errors (default)
  -fini SYMBOL                Call SYMBOL at unload-time
  --force-exe-suffix          Force generation of file with .exe suffix
  --gc-sections               Remove unused sections (on some targets)
  --no-gc-sections            Don't remove unused sections (default)
  --print-gc-sections         List removed unused sections on stderr
  --no-print-gc-sections      Do not list removed unused sections
  --gc-keep-exported          Keep exported symbols when removing
unused sections
  --hash-size=<NUMBER>        Set default hash table size close to <NUMBER>
  --help                      Print option help
  -init SYMBOL                Call SYMBOL at load-time
  -Map FILE                   Write a map file
  --no-define-common          Do not define Common storage
  --no-demangle               Do not demangle symbol names
  --no-keep-memory            Use less memory and more disk I/O
  --no-undefined              Do not allow unresolved references in object files
  --allow-shlib-undefined     Allow unresolved references in shared libraries
  --no-allow-shlib-undefined  Do not allow unresolved references in shared libs
  --allow-multiple-definition Allow multiple definitions
  --no-undefined-version      Disallow undefined version
  --default-symver            Create default symbol version
  --default-imported-symver   Create default symbol version for imported symbols
  --no-warn-mismatch          Don't warn about mismatched input files
  --no-warn-search-mismatch   Don't warn on finding an incompatible library
  --no-whole-archive          Turn off --whole-archive
  --noinhibit-exec            Create an output file even if errors occur
  -nostdlib                   Only use library directories specified on
                                the command line
  --oformat TARGET            Specify target of output file
  --print-output-format       Print default output format
  --print-sysroot             Print current sysroot
  -qmagic                     Ignored for Linux compatibility
  --reduce-memory-overheads   Reduce memory overheads, possibly taking
much longer
  --relax                     Reduce code size by using target
specific optimizations
  --no-relax                  Do not use relaxation techniques to
reduce code size
  --retain-symbols-file FILE  Keep only symbols listed in FILE
  -rpath PATH                 Set runtime shared library search path
  -rpath-link PATH            Set link time shared library search path
  -shared, -Bshareable        Create a shared library
  -pie, --pic-executable      Create a position independent executable
  --sort-common [=ascending|descending]
                              Sort common symbols by alignment [in
specified order]
  --sort-section name|alignment
                              Sort sections by name or maximum alignment
  --spare-dynamic-tags COUNT  How many tags to reserve in .dynamic section
  --split-by-file [=SIZE]     Split output sections every SIZE octets
  --split-by-reloc [=COUNT]   Split output sections every COUNT relocs
  --stats                     Print memory usage statistics
  --target-help               Display target specific options
  --task-link SYMBOL          Do task level linking
  --traditional-format        Use same format as native linker
  --section-start SECTION=ADDRESS
                              Set address of named section
  -Tbss ADDRESS               Set address of .bss section
  -Tdata ADDRESS              Set address of .data section
  -Ttext ADDRESS              Set address of .text section
  -Ttext-segment ADDRESS      Set address of text segment
  -Trodata-segment ADDRESS    Set address of rodata segment
  -Tldata-segment ADDRESS     Set address of ldata segment
  --unresolved-symbols=<method>
                              How to handle unresolved symbols.  <method> is:
                                ignore-all, report-all, ignore-in-object-files,
                                ignore-in-shared-libs
  --verbose [=NUMBER]         Output lots of information during link
  --version-script FILE       Read version information script
  --version-exports-section SYMBOL
                              Take export symbols list from .exports, using
                                SYMBOL as the version.
  --dynamic-list-data         Add data symbols to dynamic list
  --dynamic-list-cpp-new      Use C++ operator new/delete dynamic list
  --dynamic-list-cpp-typeinfo Use C++ typeinfo dynamic list
  --dynamic-list FILE         Read dynamic list
  --warn-common               Warn about duplicate common symbols
  --warn-constructors         Warn if global constructors/destructors are seen
  --warn-multiple-gp          Warn if the multiple GP values are used
  --warn-once                 Warn only once per undefined symbol
  --warn-section-align        Warn if start of section changes due to alignment
  --warn-shared-textrel       Warn if shared object has DT_TEXTREL
  --warn-alternate-em         Warn if an object has alternate ELF machine code
  --warn-unresolved-symbols   Report unresolved symbols as warnings
  --error-unresolved-symbols  Report unresolved symbols as errors
  --whole-archive             Include all objects from following archives
  --wrap SYMBOL               Use wrapper functions for SYMBOL
  --ignore-unresolved-symbol SYMBOL
                              Unresolved SYMBOL will not cause an
error or warning
  --push-state                Push state of flags governing input file handling
  --pop-state                 Pop state of flags governing input file handling
  --print-memory-usage        Report target memory usage
  --orphan-handling =MODE     Control how orphan sections are handled.
  --print-map-discarded       Show discarded sections in map file
output (default)
  --no-print-map-discarded    Do not show discarded sections in map file output
  @FILE                       Read options from FILE
arch-elf-ld: supported targets: elf32-arch elf32-little elf32-big srec
symbolsrec verilog tekhex binary ihex plugin
arch-elf-ld: supported emulations: elf32arch
arch-elf-ld: emulation specific options:
ELF emulations:
  --build-id[=STYLE]          Generate build ID note
  --compress-debug-sections=[none|zlib|zlib-gnu|zlib-gabi]
                              Compress DWARF debug sections using zlib
                               Default: none
  -z common-page-size=SIZE    Set common page size to SIZE
  -z max-page-size=SIZE       Set maximum page size to SIZE
  -z defs                     Report unresolved symbols in object files
  -z muldefs                  Allow multiple definitions
  -z execstack                Mark executable as requiring executable stack
  -z noexecstack              Mark executable as not requiring executable stack
  -z globalaudit              Mark executable requiring global auditing
  no emulation specific options.

Report bugs to <http://www.sourceware.org/bugzilla/>

>
> Ian