Re: Anyone tried hooking up Link Time Optimization (LTO)

[Paul Menzel]

Dear GRUB folks,


Am 24.02.20 um 12:57 schrieb Paul Menzel:
> Dear GRUB folks,
>
>
> Jacob integrated support for LTO (Link Time Optimization) to coreboot [1],
> libpayload [2], and the payload *coreinfo* [3] resulting in a noticeable
> reduction in the size.
>
> So maybe GRUB would benefit too. Has anyone looked into this already?

Just adding `-flto` to the C flags fails.

> $ make CFLAGS="-flto"

> cp lib/libgcrypt-grub/cipher/crypto.lst crypto.lst
> cat kernel_syms.lst > syminfo.lst.new
> for m in disk.module trig.module    cs5536.module        usb.module         
> usbserial_common.module         usbserial_pl2303.module         
> usbserial_ftdi.module         usbserial_usbdebug.module         uhci.module     
>    ohci.module        ehci.module       pci.module      nativedisk.module       
>      cmostest.module         cmosdump.module          iorw.module             
> cbtime.module       cbls.module       cbmemc.module    regexp.module   
> acpi.module          lsacpi.module                                           
> blocklist.module     boot.module              cat.module cmp.module 
> configfile.module    cpuid.module       date.module  echo.module eval.module    
> extcmd.module           gptsync.module     halt.module                       
> reboot.module                   hashsum.module pgp.module verifiers.module     
> hdparm.module      help.module hexdump.module keystatus.module   loadenv.module 
> ls.module lsmmap.module    lspci.module     memrw.module minicmd.module 
> parttool.module password.module password_pbkdf2.module    play.module       
> spkmodem.module       morse.module    probe.module read.module search.module 
> search_fs_file.module search_fs_uuid.module search_label.module    
> setpci.module        pcidump.module     sleep.module   smbios.module          
> terminal.module test.module true.module    usbtest.module      videoinfo.module 
> videotest.module xnu_uuid.module dm_nv.module loopback.module cryptodisk.module 
> json.module afsplitter.module luks.module luks2.module geli.module lvm.module 
> ldm.module mdraid09.module mdraid09_be.module mdraid1x.module diskfilter.module 
> raid5rec.module raid6rec.module scsi.module memdisk.module    ata.module        
>  ahci.module        pata.module         usbms.module         efiemu.module      
>                  procfs.module affs.module afs.module bfs.module zstd.module 
> btrfs.module archelp.module cbfs.module cpio.module cpio_be.module newc.module 
> odc.module ext2.module fat.module exfat.module f2fs.module fshelp.module 
> hfs.module hfsplus.module hfspluscomp.module iso9660.module jfs.module 
> minix.module minix2.module minix3.module minix_be.module minix2_be.module 
> minix3_be.module nilfs2.module ntfs.module ntfscomp.module reiserfs.module 
> romfs.module sfs.module squash4.module tar.module udf.module ufs1.module 
> ufs1_be.module ufs2.module xfs.module zfs.module zfscrypt.module zfsinfo.module 
> macbless.module  gettext.module gfxmenu.module hello.module gzio.module 
> offsetio.module                     elf.module crypto.module pbkdf2.module    
> relocator.module              datetime.module                   setjmp.module   
>  aout.module       bsd.module       linux16.module       multiboot2.module      
>      multiboot.module         linux.module                          xnu.module  
>    random.module   macho.module     chain.module          mmap.module           
>   normal.module part_acorn.module part_amiga.module part_apple.module 
> part_gpt.module part_msdos.module part_sun.module part_plan.module 
> part_dvh.module part_bsd.module part_sunpc.module part_dfly.module 
> msdospart.module    at_keyboard.module                        
> gfxterm_background.module    serial.module                terminfo.module       
>      usb_keyboard.module        mda_text.module     video_cirrus.module       
> video_bochs.module    functional_test.module exfctest.module 
> strtoull_test.module setjmp_test.module signature_test.module sleep_test.module 
> xnu_uuid_test.module pbkdf2_test.module            div.module              
> div_test.module mul_test.module shift_test.module cmp_test.module 
> ctz_test.module bswap_test.module videotest_checksum.module gfxterm_menu.module 
> cmdline_cat_test.module bitmap.module bitmap_scale.module          jpeg.module 
> png.module tga.module                                          
> video_colors.module   datehook.module net.module tftp.module http.module        
>            syslinuxcfg.module test_blockarg.module xzio.module lzopio.module 
> testload.module    backtrace.module          keylayouts.module    
> priority_queue.module time.module   adler32.module crc64.module mpi.module 
> all_video.module    gdb.module   testspeed.module  tr.module progress.module 
> file.module    rdmsr.module       wrmsr.module    gcry_arcfour.module 
> gcry_blowfish.module gcry_camellia.module gcry_cast5.module gcry_crc.module 
> gcry_des.module gcry_dsa.module gcry_idea.module gcry_md4.module 
> gcry_md5.module gcry_rfc2268.module gcry_rijndael.module gcry_rmd160.module 
> gcry_rsa.module gcry_seed.module gcry_serpent.module gcry_sha1.module 
> gcry_sha256.module gcry_sha512.module gcry_tiger.module gcry_twofish.module 
> gcry_whirlpool.module; do \
>   sh gensyminfo.sh $m >> syminfo.lst.new || exit 1; \
> done
> nm: all_video.module: no symbols
> nm: all_video.module: no symbols
> mv syminfo.lst.new syminfo.lst
> cat syminfo.lst | sort | mawk -f ./genmoddep.awk > moddep.lst || (rm -f 
> moddep.lst; exit 1)
> grub_putcode in help is not defined
> grub_extractor_level in normal is not defined
> grub_getstringwidth in normal is not defined
> grub_print_ucs4_menu in normal is not defined
> grub_putcode in normal is not defined
> make[3]: *** [Makefile:49401: moddep.lst] Fehler 1
> make[3]: Verzeichnis „/dev/shm/grub/grub-core“ wird verlassen
> make[2]: *** [Makefile:27430: all] Fehler 2
> make[2]: Verzeichnis „/dev/shm/grub/grub-core“ wird verlassen
> make[1]: *** [Makefile:11914: all-recursive] Fehler 1
> make[1]: Verzeichnis „/dev/shm/grub“ wird verlassen
> make: *** [Makefile:3766: all] Fehler 2


Kind regards,

Paul


> [1]: https://review.coreboot.org/c/coreboot/+/38989
> [2]: https://review.coreboot.org/c/coreboot/+/38291
> [3]: https://review.coreboot.org/c/coreboot/+/38293