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For ELF targets, section symbols are required only for relocations. With -ffunction-sections -fdata-sections, there can be many unused section symbols. Sizes of libstdc++.a on Linux/x86-64 in GCC 11 are With unused section symbols : 39411698 bytes Without unused section symbols: 39227002 bytes The unused section symbols in libstdc++.a occupy more than 180 KB. Add BSF_SECTION_SYM_USED to indicate if a section symbol should be included in the symbol table. The BSF_SECTION_SYM_USED should be set if the section symbol is used for relocation or the section symbol is always included in the symbol table. Add keep_unused_section_symbols to bfd_target to indicate if unused section symbols should be kept. If TARGET_KEEP_UNUSED_SECTION_SYMBOLS is defined as FALSE, unused ection symbols will be removed. Tested on Linux/x86. Other ELF backends need to: 1. Define TARGET_KEEP_UNUSED_SECTION_SYMBOLS to FALSE. 2. Mark used section symbols in assembler backend. 3. Remove unused section symbols from expected assembler and linker outputs. bfd/ PR 27109 * aix386-core.c (core_aix386_vec): Initialize keep_unused_section_symbol to TARGET_KEEP_UNUSED_SECTION_SYMBOLS. * aout-target.h (MY (vec)): Likewise. * binary.c (binary_vec): Likewise. * cisco-core.c (core_cisco_be_vec): Likewise. (core_cisco_le_vec): Likewise. * coff-alpha.c (alpha_ecoff_le_vec): Likewise. * coff-i386.c (TARGET_SYM): Likewise. (TARGET_SYM_BIG): Likewise. * coff-ia64.c (TARGET_SYM): Likewise. * coff-mips.c (mips_ecoff_le_vec): Likewise. (mips_ecoff_be_vec): Likewise. (mips_ecoff_bele_vec): Likewise. * coff-rs6000.c (rs6000_xcoff_vec): Likewise. (powerpc_xcoff_vec): Likewise. * coff-sh.c (sh_coff_small_vec): Likewise. (sh_coff_small_le_vec): Likewise. * coff-tic30.c (tic30_coff_vec): Likewise. * coff-tic54x.c (tic54x_coff0_vec): Likewise. (tic54x_coff0_beh_vec): Likewise. (tic54x_coff1_vec): Likewise. (tic54x_coff1_beh_vec): Likewise. (tic54x_coff2_vec): Likewise. (tic54x_coff2_beh_vec): Likewise. * coff-x86_64.c (TARGET_SYM): Likewise. (TARGET_SYM_BIG): Likewise. * coff64-rs6000.c (rs6000_xcoff64_vec): Likewise. (rs6000_xcoff64_aix_vec): Likewise. * coffcode.h (CREATE_BIG_COFF_TARGET_VEC): Likewise. (CREATE_BIGHDR_COFF_TARGET_VEC): Likewise. (CREATE_LITTLE_COFF_TARGET_VEC): Likewise. * elfxx-target.h (TARGET_BIG_SYM): Likewise. (TARGET_LITTLE_SYM): Likewise. * hppabsd-core.c (core_hppabsd_vec): Likewise. * hpux-core.c (core_hpux_vec): Likewise. * i386msdos.c (i386_msdos_vec): Likewise. * ihex.c (ihex_vec): Likewise. * irix-core.c (core_irix_vec): Likewise. * mach-o-target.c (TARGET_NAME): Likewise. * mmo.c (mmix_mmo_vec): Likewise. * netbsd-core.c (core_netbsd_vec): Likewise. * osf-core.c (core_osf_vec): Likewise. * pdp11.c (MY (vec)): Likewise. * pef.c (pef_vec): Likewise. (pef_xlib_vec): Likewise. * plugin.c (plugin_vec): Likewise. * ppcboot.c (powerpc_boot_vec): Likewise. * ptrace-core.c (core_ptrace_vec): Likewise. * sco5-core.c (core_sco5_vec): Likewise. * som.c (hppa_som_vec): Likewise. * srec.c (srec_vec): Likewise. (symbolsrec_vec): Likewise. * tekhex.c (tekhex_vec): Likewise. * trad-core.c (core_trad_vec): Likewise. * verilog.c (verilog_vec): Likewise. * vms-alpha.c (alpha_vms_vec): Likewise. * vms-lib.c (alpha_vms_lib_txt_vec): Likewise. * wasm-module.c (wasm_vec): Likewise. * xsym.c (sym_vec): Likewise. * elf.c (ignore_section_sym): Return TRUE if BSF_SECTION_SYM_USED isn't set. (elf_map_symbols): Don't include ignored section symbols. * elfcode.h (elf_slurp_symbol_table): Also set BSF_SECTION_SYM_USED on STT_SECTION symbols. * elflink.c (bfd_elf_final_link): Generated section symbols only when emitting relocations or reqired. * elfxx-x86.h (TARGET_KEEP_UNUSED_SECTION_SYMBOLS): New. * syms.c (BSF_SECTION_SYM_USED): New. * targets.c (TARGET_KEEP_UNUSED_SECTION_SYMBOLS): New. (bfd_target): Add keep_unused_section_symbols. (bfd_keep_unused_section_symbols): New. * bfd-in2.h: Regenerated. binutils/ PR 27109 * objcopy.c (copy_object): Handle section symbols for non-relocatable inputs. * testsuite/binutils-all/readelf.exp (readelf_test): Check is_elf_unused_section_symbols. * testsuite/binutils-all/readelf.s-64: Updated. * testsuite/binutils-all/readelf.ss: Likewise. * testsuite/binutils-all/readelf.ss-64: Likewise. * testsuite/binutils-all/readelf.s-64-unused: New file. * testsuite/binutils-all/readelf.ss-64-unused: Likewise. * testsuite/binutils-all/readelf.ss-unused: Likewise. * testsuite/lib/binutils-common.exp (is_elf_unused_section_symbols): New proc. gas/ChangeLog: PR 27109 * read.c (s_reloc): Call symbol_mark_used_in_reloc on the section symbol. * subsegs.c (subseg_set_rest): Set BSF_SECTION_SYM_USED if needed. * write.c (adjust_reloc_syms): Call symbol_mark_used_in_reloc on the section symbol. (set_symtab): Don't generate unused section symbols. (maybe_generate_build_notes): Call symbol_mark_used_in_reloc on the section symbol. * config/obj-elf.c (elf_adjust_symtab): Call symbol_mark_used_in_reloc on the group signature symbol. * testsuite/gas/cfi/cfi-label.d: Remove unused section symbols from expected output. * testsuite/gas/elf/elf.exp (run_elf_list_test): Check is_elf_unused_section_symbols. * testsuite/gas/elf/section2.e: Updated. * testsuite/gas/elf/section2.e-unused: New file. * testsuite/gas/elf/symver.d: Remove unused section symbols. * testsuite/gas/i386/ilp32/elf/symver.d: Likewise. * testsuite/gas/i386/ilp32/x86-64-size-1.d: Likewise. * testsuite/gas/i386/ilp32/x86-64-size-3.d: Likewise. * testsuite/gas/i386/ilp32/x86-64-size-5.d: Likewise. * testsuite/gas/i386/ilp32/x86-64-unwind.d: Likewise. * testsuite/gas/i386/size-1.d: Likewise. * testsuite/gas/i386/size-3.d: Likewise. * testsuite/gas/i386/svr4.d: Likewise. * testsuite/gas/i386/x86-64-size-1.d: Likewise. * testsuite/gas/i386/x86-64-size-3.d: Likewise. * testsuite/gas/i386/x86-64-size-5.d: Likewise. * testsuite/gas/i386/x86-64-unwind.d: Likewise. ld/ PR 27109 * testsuite/ld-elf/export-class.sd: Adjust the expected output. * testsuite/ld-elf/loadaddr3b.d: Likewise. * testsuite/ld-i386/ibt-plt-1.d: Likewise. * testsuite/ld-i386/ibt-plt-2a.d: Likewise. * testsuite/ld-i386/ibt-plt-2c.d: Likewise. * testsuite/ld-i386/ibt-plt-3a.d: Likewise. * testsuite/ld-i386/ibt-plt-3c.d: Likewise. * testsuite/ld-i386/pr19636-1d.d: Likewise. * testsuite/ld-i386/pr19636-1l.d: Likewise. * testsuite/ld-i386/pr19636-2c.d: Likewise. * testsuite/ld-ifunc/ifunc-2-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-x86-64-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-x86-64-now.d: Likewise. * testsuite/ld-ifunc/ifunc-21-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-22-x86-64.d: Likewise. * testsuite/ld-ifunc/pr17154-i386-now.d: Likewise. * testsuite/ld-ifunc/pr17154-i386.d: Likewise. * testsuite/ld-ifunc/pr17154-x86-64-now.d: Likewise. * testsuite/ld-ifunc/pr17154-x86-64.d: Likewise. * testsuite/ld-x86-64/bnd-branch-1-now.d: Likewise. * testsuite/ld-x86-64/bnd-ifunc-1-now.d: Likewise. * testsuite/ld-x86-64/bnd-ifunc-2-now.d: Likewise. * testsuite/ld-x86-64/bnd-ifunc-2.d: Likewise. * testsuite/ld-x86-64/bnd-plt-1-now.d: Likewise. * testsuite/ld-x86-64/bnd-plt-1.d: Likewise. * testsuite/ld-x86-64/ibt-plt-1-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-1.d: Likewise. * testsuite/ld-x86-64/ibt-plt-2a-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-2a.d: Likewise. * testsuite/ld-x86-64/ibt-plt-2c-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-2c.d: Likewise. * testsuite/ld-x86-64/ibt-plt-3a-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-3a.d: Likewise. * testsuite/ld-x86-64/ibt-plt-3c-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-3c.d: Likewise. * testsuite/ld-x86-64/pr19609-4e.d: Likewise. * testsuite/ld-x86-64/pr19609-6a.d: Likewise. * testsuite/ld-x86-64/pr19609-6b.d: Likewise. * testsuite/ld-x86-64/pr19609-7b.d: Likewise. * testsuite/ld-x86-64/pr19609-7d.d: Likewise. * testsuite/ld-x86-64/pr19636-2l.d: Likewise. * testsuite/ld-x86-64/pr20253-1d.d: Likewise. * testsuite/ld-x86-64/pr20253-1h.d: Likewise. * testsuite/ld-x86-64/pr21038b-now.d: Likewise. * testsuite/ld-x86-64/pr21038b.d: Likewise. * testsuite/ld-x86-64/pr21038c-now.d: Likewise. * testsuite/ld-x86-64/pr21038c.d: Likewise. * testsuite/ld-x86-64/pr23854.d: Likewise. * testsuite/ld-x86-64/pr25416-3.d: Likewise. * testsuite/ld-x86-64/pr25416-4.d: Likewise. * testsuite/ld-i386/plt-pic.pd: Likewise. * testsuite/ld-i386/plt-pic2.dd: Likewise. * testsuite/ld-i386/plt.pd: Likewise. * testsuite/ld-i386/plt2.dd: Likewise. * testsuite/ld-i386/tlsbin.rd: Likewise. * testsuite/ld-i386/tlsbin2.rd: Likewise. * testsuite/ld-i386/tlsbindesc.rd: Likewise. * testsuite/ld-i386/tlsdesc.rd: Likewise. * testsuite/ld-i386/tlsgdesc.rd: Likewise. * testsuite/ld-i386/tlsnopic.rd: Likewise. * testsuite/ld-i386/tlspic.rd: Likewise. * testsuite/ld-i386/tlspic2.rd: Likewise. * testsuite/ld-x86-64/mpx3.dd: Likewise. * testsuite/ld-x86-64/mpx3n.dd: Likewise. * testsuite/ld-x86-64/mpx4.dd: Likewise. * testsuite/ld-x86-64/mpx4n.dd: Likewise. * testsuite/ld-x86-64/pe-x86-64-1.od: Likewise. * testsuite/ld-x86-64/pe-x86-64-2.od: Likewise. * testsuite/ld-x86-64/pe-x86-64-3.od: Likewise. * testsuite/ld-x86-64/pe-x86-64-4.od: Likewise. * testsuite/ld-x86-64/plt.pd: Likewise. * testsuite/ld-x86-64/plt2.dd: Likewise. * testsuite/ld-x86-64/tlsbin.rd: Likewise. * testsuite/ld-x86-64/tlsbin2.rd: Likewise. * testsuite/ld-x86-64/tlsbindesc.rd: Likewise. * testsuite/ld-x86-64/tlsdesc.rd: Likewise. * testsuite/ld-x86-64/tlsgdesc.rd: Likewise. * testsuite/ld-x86-64/tlspic.rd: Likewise. * testsuite/ld-x86-64/tlspic2.rd: Likewise. * testsuite/ld-elf/sec64k.exp: Check is_elf_unused_section_symbols. |
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.. | ||
aarch64 | ||
arc | ||
arm | ||
bfin | ||
hppa | ||
i386 | ||
m68k | ||
mips | ||
nfp | ||
vax | ||
wasm32 | ||
windres | ||
x86-64 | ||
add-empty-section.d | ||
add-section.d | ||
add-symbol.d | ||
alias-2.def | ||
alias.def | ||
ar.exp | ||
bintest.s | ||
common-1.s | ||
common-1a.d | ||
common-1b.d | ||
common-1c.d | ||
common-1d.d | ||
common-1e.d | ||
common-1f.d | ||
common-2.s | ||
common-2a.d | ||
common-2b.d | ||
common-2c.d | ||
common-2d.d | ||
common-2e.d | ||
common-2f.d | ||
compress.exp | ||
copy-1.d | ||
copy-1.s | ||
copy-2.d | ||
copy-3.d | ||
copy-4.d | ||
copy-5.d | ||
copy-6.d | ||
copytest.s | ||
cxxfilt.exp | ||
data-sections.s | ||
debug_str.d | ||
debug_str.s | ||
debuginfod.exp | ||
debuglink.s | ||
disasm.s | ||
dlltool.exp | ||
dumptest.s | ||
dw2-1.S | ||
dw2-1.W | ||
dw2-2.S | ||
dw2-3.rS | ||
dw2-3.rt | ||
dw2-3.S | ||
dw2-3.W | ||
dw2-3gabi.W | ||
dw2-compressed.S | ||
dw2-decodedline-1.S | ||
dw2-decodedline.S | ||
dw2-empty.S | ||
dw2-ranges.S | ||
dw2-ranges.W | ||
dw4.s | ||
dw5.S | ||
dw5.W | ||
dwarf-attributes.S | ||
dwarf-attributes.W | ||
dwo.s | ||
elfedit-1.d | ||
elfedit-2.d | ||
elfedit-3.d | ||
elfedit-4.d | ||
elfedit-5.d | ||
elfedit.exp | ||
empty | ||
empty-file | ||
empty.s | ||
exclude-1.s | ||
exclude-1a.d | ||
exclude-1b.d | ||
fastcall.def | ||
group-2.s | ||
group-3.s | ||
group-4.s | ||
group-5.d | ||
group-5.s | ||
group-6.d | ||
group-6.s | ||
group-7.s | ||
group-7a.d | ||
group-7b.d | ||
group-7c.d | ||
group.s | ||
ifunc.s | ||
keep-section-1.d | ||
keep-section-2.d | ||
libdw2-compressed.out | ||
libdw2-compressedgabi.out | ||
libdw2.out | ||
link-order.s | ||
linkdebug.s | ||
localize-hidden-1.d | ||
localize-hidden-1.s | ||
localize-hidden-2.d | ||
localize-hidden-2.s | ||
locview-1.s | ||
locview-2.s | ||
mangled.s | ||
mbind1.s | ||
needed-by-reloc.s | ||
nm-1.s | ||
nm-elf-1.s | ||
nm-ver.s | ||
nm.exp | ||
note-1.d | ||
note-2-32.d | ||
note-2-32.s | ||
note-2-64.d | ||
note-2-64.s | ||
note-3-32.d | ||
note-3-32.s | ||
note-3-64.d | ||
note-3-64.s | ||
note-3.32.s | ||
note-4-32.d | ||
note-4-32.s | ||
note-4-64.d | ||
note-4-64.s | ||
note-5.d | ||
note-5.s | ||
note-6-32.d | ||
note-6-32.s | ||
note-6-64.d | ||
note-6-64.s | ||
objcopy.exp | ||
objdump.exp | ||
objdump.s | ||
objdump.W | ||
objdump.Wk | ||
objdump.WK2 | ||
objdump.WK3 | ||
objdump.WL | ||
only-section-01.d | ||
pr18374.s | ||
pr19020.in | ||
pr19020a.d | ||
pr19020b.d | ||
pr19547.c | ||
pr23633.d | ||
pr23633.list | ||
pr23633.s | ||
pr25543.d | ||
pr25543.s | ||
pr25662-pdp11.s | ||
pr25662.ld | ||
pr25662.s | ||
pr26112.o.bz2 | ||
pr26112.r | ||
pr26160.dwp.bz2 | ||
pr26160.r | ||
readelf-maskos-1a.d | ||
readelf-maskos-1b.d | ||
readelf-maskos-unknown.s | ||
readelf-maskos.s | ||
readelf.demangled | ||
readelf.exp | ||
readelf.h | ||
readelf.k | ||
readelf.k2 | ||
readelf.locview-1 | ||
readelf.locview-2 | ||
readelf.n | ||
readelf.pr18374 | ||
readelf.r | ||
readelf.r-64 | ||
readelf.s | ||
readelf.s-64 | ||
readelf.s-64-unused | ||
readelf.ss | ||
readelf.ss-64 | ||
readelf.ss-64-unused | ||
readelf.ss-mips | ||
readelf.ss-tmips | ||
readelf.ss-unused | ||
readelf.wa | ||
readelf.wKis | ||
readelf.z | ||
remove-relocs-01.d | ||
remove-relocs-01.s | ||
remove-relocs-02.d | ||
remove-relocs-03.d | ||
remove-relocs-04.d | ||
remove-relocs-05.d | ||
remove-relocs-06.d | ||
remove-relocs-07.d | ||
remove-relocs-07.s | ||
remove-relocs-08.d | ||
remove-section-01.d | ||
retain1.s | ||
retain1a.d | ||
retain1b.d | ||
set-section-alignment.d | ||
size.exp | ||
strings-1.bin | ||
strings.exp | ||
strip-1.d | ||
strip-2.d | ||
strip-3.d | ||
strip-4.d | ||
strip-5.d | ||
strip-6.d | ||
strip-7.d | ||
strip-8.d | ||
strip-9.d | ||
strip-10.d | ||
strip-11.d | ||
strip-12.d | ||
strip-12.s | ||
strip-13.d | ||
strip-13mips64.s | ||
strip-13rel.s | ||
strip-13rela.s | ||
strip-14.d | ||
strip-14mips64.s | ||
strip-14rel.s | ||
strip-14rela.s | ||
strip-15.d | ||
strip-15mips64.s | ||
strip-15rel.s | ||
strip-15rela.s | ||
symbols-1.d | ||
symbols-2.d | ||
symbols-3.d | ||
symbols-4.d | ||
symbols.s | ||
testprog.c | ||
testranges-ia64.d | ||
testranges-ia64.s | ||
testranges.d | ||
testranges.s | ||
unique.s | ||
unknown.s | ||
update-1.s | ||
update-2.s | ||
update-3.s | ||
update-4.s | ||
update-section.exp | ||
verilog-1.hex | ||
verilog-2.hex | ||
verilog-4.hex | ||
verilog-8.hex | ||
verilogtest.s | ||
version.def | ||
version.s | ||
z.s | ||
zero-sec.r | ||
zero-sec.s |