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List:       grub-devel
Subject:    Building with Spectre mitigations fails
From:       Luke Dashjr <luke () dashjr ! org>
Date:       2018-05-25 17:06:31
Message-ID: 201805251706.32198.luke () dashjr ! org
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My compiler (modified GCC 7.3) always builds with Spectre mitigations, but 
this seems (I'm guessing) to cause the GRUB 2 build to fail:

cat syminfo.lst | sort | 
gawk -f /var/tmp/portage/sys-boot/grub-2.02-r1/work/grub-2.02/grub-core/genmoddep.awk 
> moddep.lst || (rm -f moddep.lst; exit 1)
_GLOBAL_OFFSET_TABLE_ in acpi is not defined
_GLOBAL_OFFSET_TABLE_ in adler32 is not defined
_GLOBAL_OFFSET_TABLE_ in affs is not defined
_GLOBAL_OFFSET_TABLE_ in afs is not defined
_GLOBAL_OFFSET_TABLE_ in ahci is not defined
_GLOBAL_OFFSET_TABLE_ in aout is not defined
_GLOBAL_OFFSET_TABLE_ in appleldr is not defined
_GLOBAL_OFFSET_TABLE_ in archelp is not defined
_GLOBAL_OFFSET_TABLE_ in at_keyboard is not defined
_GLOBAL_OFFSET_TABLE_ in ata is not defined
_GLOBAL_OFFSET_TABLE_ in backtrace is not defined
_GLOBAL_OFFSET_TABLE_ in bfs is not defined
_GLOBAL_OFFSET_TABLE_ in bitmap is not defined
_GLOBAL_OFFSET_TABLE_ in bitmap_scale is not defined
_GLOBAL_OFFSET_TABLE_ in blocklist is not defined
_GLOBAL_OFFSET_TABLE_ in boot is not defined
_GLOBAL_OFFSET_TABLE_ in bsd is not defined
_GLOBAL_OFFSET_TABLE_ in bswap_test is not defined
_GLOBAL_OFFSET_TABLE_ in btrfs is not defined
_GLOBAL_OFFSET_TABLE_ in bufio is not defined
_GLOBAL_OFFSET_TABLE_ in cat is not defined
_GLOBAL_OFFSET_TABLE_ in cbfs is not defined
_GLOBAL_OFFSET_TABLE_ in cbls is not defined
_GLOBAL_OFFSET_TABLE_ in cbmemc is not defined
_GLOBAL_OFFSET_TABLE_ in cbtable is not defined
_GLOBAL_OFFSET_TABLE_ in cbtime is not defined
_GLOBAL_OFFSET_TABLE_ in chain is not defined
_GLOBAL_OFFSET_TABLE_ in cmdline_cat_test is not defined
_GLOBAL_OFFSET_TABLE_ in cmp is not defined
_GLOBAL_OFFSET_TABLE_ in cmp_test is not defined
_GLOBAL_OFFSET_TABLE_ in configfile is not defined
_GLOBAL_OFFSET_TABLE_ in cpio is not defined
_GLOBAL_OFFSET_TABLE_ in cpio_be is not defined
_GLOBAL_OFFSET_TABLE_ in cpuid is not defined
_GLOBAL_OFFSET_TABLE_ in crc64 is not defined
_GLOBAL_OFFSET_TABLE_ in crypto is not defined
_GLOBAL_OFFSET_TABLE_ in cryptodisk is not defined
_GLOBAL_OFFSET_TABLE_ in cs5536 is not defined
_GLOBAL_OFFSET_TABLE_ in ctz_test is not defined
_GLOBAL_OFFSET_TABLE_ in date is not defined
_GLOBAL_OFFSET_TABLE_ in datehook is not defined
_GLOBAL_OFFSET_TABLE_ in datetime is not defined
_GLOBAL_OFFSET_TABLE_ in disk is not defined
_GLOBAL_OFFSET_TABLE_ in diskfilter is not defined
_GLOBAL_OFFSET_TABLE_ in div is not defined
_GLOBAL_OFFSET_TABLE_ in div_test is not defined
_GLOBAL_OFFSET_TABLE_ in dm_nv is not defined
_GLOBAL_OFFSET_TABLE_ in echo is not defined
_GLOBAL_OFFSET_TABLE_ in efi_gop is not defined
_GLOBAL_OFFSET_TABLE_ in efi_uga is not defined
_GLOBAL_OFFSET_TABLE_ in efifwsetup is not defined
_GLOBAL_OFFSET_TABLE_ in efinet is not defined
_GLOBAL_OFFSET_TABLE_ in ehci is not defined
_GLOBAL_OFFSET_TABLE_ in elf is not defined
_GLOBAL_OFFSET_TABLE_ in eval is not defined
_GLOBAL_OFFSET_TABLE_ in exfat is not defined
_GLOBAL_OFFSET_TABLE_ in exfctest is not defined
_GLOBAL_OFFSET_TABLE_ in ext2 is not defined
_GLOBAL_OFFSET_TABLE_ in extcmd is not defined
_GLOBAL_OFFSET_TABLE_ in fat is not defined
_GLOBAL_OFFSET_TABLE_ in file is not defined
_GLOBAL_OFFSET_TABLE_ in fixvideo is not defined
_GLOBAL_OFFSET_TABLE_ in font is not defined
_GLOBAL_OFFSET_TABLE_ in fshelp is not defined
_GLOBAL_OFFSET_TABLE_ in functional_test is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_arcfour is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_blowfish is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_camellia is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_cast5 is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_crc is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_des is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_dsa is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_idea is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_md4 is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_md5 is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_rfc2268 is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_rijndael is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_rmd160 is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_rsa is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_seed is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_serpent is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_sha1 is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_sha256 is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_sha512 is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_tiger is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_twofish is not defined
_GLOBAL_OFFSET_TABLE_ in gcry_whirlpool is not defined
_GLOBAL_OFFSET_TABLE_ in geli is not defined
_GLOBAL_OFFSET_TABLE_ in gettext is not defined
_GLOBAL_OFFSET_TABLE_ in gfxmenu is not defined
_GLOBAL_OFFSET_TABLE_ in gfxterm is not defined
_GLOBAL_OFFSET_TABLE_ in gfxterm_background is not defined
_GLOBAL_OFFSET_TABLE_ in gfxterm_menu is not defined
_GLOBAL_OFFSET_TABLE_ in gptsync is not defined
_GLOBAL_OFFSET_TABLE_ in gzio is not defined
_GLOBAL_OFFSET_TABLE_ in halt is not defined
_GLOBAL_OFFSET_TABLE_ in hashsum is not defined
_GLOBAL_OFFSET_TABLE_ in hdparm is not defined
_GLOBAL_OFFSET_TABLE_ in hello is not defined
_GLOBAL_OFFSET_TABLE_ in help is not defined
_GLOBAL_OFFSET_TABLE_ in hexdump is not defined
_GLOBAL_OFFSET_TABLE_ in hfs is not defined
_GLOBAL_OFFSET_TABLE_ in hfsplus is not defined
_GLOBAL_OFFSET_TABLE_ in hfspluscomp is not defined
_GLOBAL_OFFSET_TABLE_ in http is not defined
_GLOBAL_OFFSET_TABLE_ in iorw is not defined
_GLOBAL_OFFSET_TABLE_ in iso9660 is not defined
_GLOBAL_OFFSET_TABLE_ in jfs is not defined
_GLOBAL_OFFSET_TABLE_ in jpeg is not defined
_GLOBAL_OFFSET_TABLE_ in keylayouts is not defined
_GLOBAL_OFFSET_TABLE_ in keystatus is not defined
_GLOBAL_OFFSET_TABLE_ in ldm is not defined
_GLOBAL_OFFSET_TABLE_ in legacy_password_test is not defined
_GLOBAL_OFFSET_TABLE_ in legacycfg is not defined
_GLOBAL_OFFSET_TABLE_ in linux is not defined
_GLOBAL_OFFSET_TABLE_ in linux16 is not defined
_GLOBAL_OFFSET_TABLE_ in loadbios is not defined
_GLOBAL_OFFSET_TABLE_ in loadenv is not defined
_GLOBAL_OFFSET_TABLE_ in loopback is not defined
_GLOBAL_OFFSET_TABLE_ in ls is not defined
_GLOBAL_OFFSET_TABLE_ in lsacpi is not defined
_GLOBAL_OFFSET_TABLE_ in lsefi is not defined
_GLOBAL_OFFSET_TABLE_ in lsefimmap is not defined
_GLOBAL_OFFSET_TABLE_ in lsefisystab is not defined
_GLOBAL_OFFSET_TABLE_ in lsmmap is not defined
_GLOBAL_OFFSET_TABLE_ in lspci is not defined
_GLOBAL_OFFSET_TABLE_ in lssal is not defined
_GLOBAL_OFFSET_TABLE_ in luks is not defined
_GLOBAL_OFFSET_TABLE_ in lvm is not defined
_GLOBAL_OFFSET_TABLE_ in lzopio is not defined
_GLOBAL_OFFSET_TABLE_ in macbless is not defined
_GLOBAL_OFFSET_TABLE_ in macho is not defined
_GLOBAL_OFFSET_TABLE_ in mdraid09 is not defined
_GLOBAL_OFFSET_TABLE_ in mdraid09_be is not defined
_GLOBAL_OFFSET_TABLE_ in mdraid1x is not defined
_GLOBAL_OFFSET_TABLE_ in memdisk is not defined
_GLOBAL_OFFSET_TABLE_ in memrw is not defined
_GLOBAL_OFFSET_TABLE_ in minicmd is not defined
_GLOBAL_OFFSET_TABLE_ in minix is not defined
_GLOBAL_OFFSET_TABLE_ in minix2 is not defined
_GLOBAL_OFFSET_TABLE_ in minix2_be is not defined
_GLOBAL_OFFSET_TABLE_ in minix3 is not defined
_GLOBAL_OFFSET_TABLE_ in minix3_be is not defined
_GLOBAL_OFFSET_TABLE_ in minix_be is not defined
_GLOBAL_OFFSET_TABLE_ in mmap is not defined
_GLOBAL_OFFSET_TABLE_ in morse is not defined
_GLOBAL_OFFSET_TABLE_ in mpi is not defined
_GLOBAL_OFFSET_TABLE_ in msdospart is not defined
_GLOBAL_OFFSET_TABLE_ in mul_test is not defined
_GLOBAL_OFFSET_TABLE_ in multiboot is not defined
_GLOBAL_OFFSET_TABLE_ in multiboot2 is not defined
_GLOBAL_OFFSET_TABLE_ in nativedisk is not defined
_GLOBAL_OFFSET_TABLE_ in net is not defined
_GLOBAL_OFFSET_TABLE_ in newc is not defined
_GLOBAL_OFFSET_TABLE_ in nilfs2 is not defined
_GLOBAL_OFFSET_TABLE_ in normal is not defined
_GLOBAL_OFFSET_TABLE_ in ntfs is not defined
_GLOBAL_OFFSET_TABLE_ in ntfscomp is not defined
_GLOBAL_OFFSET_TABLE_ in odc is not defined
_GLOBAL_OFFSET_TABLE_ in offsetio is not defined
_GLOBAL_OFFSET_TABLE_ in ohci is not defined
_GLOBAL_OFFSET_TABLE_ in part_acorn is not defined
_GLOBAL_OFFSET_TABLE_ in part_amiga is not defined
_GLOBAL_OFFSET_TABLE_ in part_apple is not defined
_GLOBAL_OFFSET_TABLE_ in part_bsd is not defined
_GLOBAL_OFFSET_TABLE_ in part_dfly is not defined
_GLOBAL_OFFSET_TABLE_ in part_dvh is not defined
_GLOBAL_OFFSET_TABLE_ in part_gpt is not defined
_GLOBAL_OFFSET_TABLE_ in part_msdos is not defined
_GLOBAL_OFFSET_TABLE_ in part_plan is not defined
_GLOBAL_OFFSET_TABLE_ in part_sun is not defined
_GLOBAL_OFFSET_TABLE_ in part_sunpc is not defined
_GLOBAL_OFFSET_TABLE_ in parttool is not defined
_GLOBAL_OFFSET_TABLE_ in password is not defined
_GLOBAL_OFFSET_TABLE_ in password_pbkdf2 is not defined
_GLOBAL_OFFSET_TABLE_ in pata is not defined
_GLOBAL_OFFSET_TABLE_ in pbkdf2 is not defined
_GLOBAL_OFFSET_TABLE_ in pbkdf2_test is not defined
_GLOBAL_OFFSET_TABLE_ in pcidump is not defined
_GLOBAL_OFFSET_TABLE_ in play is not defined
_GLOBAL_OFFSET_TABLE_ in png is not defined
_GLOBAL_OFFSET_TABLE_ in priority_queue is not defined
_GLOBAL_OFFSET_TABLE_ in probe is not defined
_GLOBAL_OFFSET_TABLE_ in procfs is not defined
_GLOBAL_OFFSET_TABLE_ in progress is not defined
_GLOBAL_OFFSET_TABLE_ in raid5rec is not defined
_GLOBAL_OFFSET_TABLE_ in raid6rec is not defined
_GLOBAL_OFFSET_TABLE_ in random is not defined
_GLOBAL_OFFSET_TABLE_ in read is not defined
_GLOBAL_OFFSET_TABLE_ in reboot is not defined
_GLOBAL_OFFSET_TABLE_ in regexp is not defined
_GLOBAL_OFFSET_TABLE_ in reiserfs is not defined
_GLOBAL_OFFSET_TABLE_ in relocator is not defined
_GLOBAL_OFFSET_TABLE_ in romfs is not defined
_GLOBAL_OFFSET_TABLE_ in scsi is not defined
_GLOBAL_OFFSET_TABLE_ in search is not defined
_GLOBAL_OFFSET_TABLE_ in search_fs_file is not defined
_GLOBAL_OFFSET_TABLE_ in search_fs_uuid is not defined
_GLOBAL_OFFSET_TABLE_ in search_label is not defined
_GLOBAL_OFFSET_TABLE_ in serial is not defined
_GLOBAL_OFFSET_TABLE_ in setjmp_test is not defined
_GLOBAL_OFFSET_TABLE_ in setpci is not defined
_GLOBAL_OFFSET_TABLE_ in sfs is not defined
_GLOBAL_OFFSET_TABLE_ in shift_test is not defined
_GLOBAL_OFFSET_TABLE_ in signature_test is not defined
_GLOBAL_OFFSET_TABLE_ in sleep is not defined
_GLOBAL_OFFSET_TABLE_ in sleep_test is not defined
_GLOBAL_OFFSET_TABLE_ in spkmodem is not defined
_GLOBAL_OFFSET_TABLE_ in squash4 is not defined
_GLOBAL_OFFSET_TABLE_ in syslinuxcfg is not defined
_GLOBAL_OFFSET_TABLE_ in tar is not defined
_GLOBAL_OFFSET_TABLE_ in terminal is not defined
_GLOBAL_OFFSET_TABLE_ in terminfo is not defined
_GLOBAL_OFFSET_TABLE_ in test is not defined
_GLOBAL_OFFSET_TABLE_ in test_blockarg is not defined
_GLOBAL_OFFSET_TABLE_ in testload is not defined
_GLOBAL_OFFSET_TABLE_ in testspeed is not defined
_GLOBAL_OFFSET_TABLE_ in tftp is not defined
_GLOBAL_OFFSET_TABLE_ in tga is not defined
_GLOBAL_OFFSET_TABLE_ in time is not defined
_GLOBAL_OFFSET_TABLE_ in tr is not defined
_GLOBAL_OFFSET_TABLE_ in true is not defined
_GLOBAL_OFFSET_TABLE_ in udf is not defined
_GLOBAL_OFFSET_TABLE_ in ufs1 is not defined
_GLOBAL_OFFSET_TABLE_ in ufs1_be is not defined
_GLOBAL_OFFSET_TABLE_ in ufs2 is not defined
_GLOBAL_OFFSET_TABLE_ in uhci is not defined
_GLOBAL_OFFSET_TABLE_ in usb is not defined
_GLOBAL_OFFSET_TABLE_ in usb_keyboard is not defined
_GLOBAL_OFFSET_TABLE_ in usbms is not defined
_GLOBAL_OFFSET_TABLE_ in usbserial_common is not defined
_GLOBAL_OFFSET_TABLE_ in usbserial_ftdi is not defined
_GLOBAL_OFFSET_TABLE_ in usbserial_pl2303 is not defined
_GLOBAL_OFFSET_TABLE_ in usbserial_usbdebug is not defined
_GLOBAL_OFFSET_TABLE_ in usbtest is not defined
_GLOBAL_OFFSET_TABLE_ in verify is not defined
_GLOBAL_OFFSET_TABLE_ in video is not defined
_GLOBAL_OFFSET_TABLE_ in video_bochs is not defined
_GLOBAL_OFFSET_TABLE_ in video_cirrus is not defined
_GLOBAL_OFFSET_TABLE_ in video_colors is not defined
_GLOBAL_OFFSET_TABLE_ in video_fb is not defined
_GLOBAL_OFFSET_TABLE_ in videoinfo is not defined
_GLOBAL_OFFSET_TABLE_ in videotest is not defined
_GLOBAL_OFFSET_TABLE_ in videotest_checksum is not defined
_GLOBAL_OFFSET_TABLE_ in xfs is not defined
_GLOBAL_OFFSET_TABLE_ in xnu is not defined
_GLOBAL_OFFSET_TABLE_ in xnu_uuid is not defined
_GLOBAL_OFFSET_TABLE_ in xnu_uuid_test is not defined
_GLOBAL_OFFSET_TABLE_ in xzio is not defined
_GLOBAL_OFFSET_TABLE_ in zfs is not defined
_GLOBAL_OFFSET_TABLE_ in zfscrypt is not defined
_GLOBAL_OFFSET_TABLE_ in zfsinfo is not defined
make[3]: *** [Makefile:42629: moddep.lst] Error 1
make[3]: Leaving 
directory '/var/tmp/portage/sys-boot/grub-2.02-r1/work/grub-2.02-efi-64/grub-core'
make[2]: *** [Makefile:23530: all] Error 2
make[2]: Leaving 
directory '/var/tmp/portage/sys-boot/grub-2.02-r1/work/grub-2.02-efi-64/grub-core'
make[1]: *** [Makefile:10903: all-recursive] Error 1
make[1]: Leaving 
directory '/var/tmp/portage/sys-boot/grub-2.02-r1/work/grub-2.02-efi-64'
make: *** [Makefile:3129: all] Error 2

I tried setting CFLAGS to disable the mitigations for GRUB, but either that 
was ineffective or GRUB is ignoring the CFLAGS for this part of the build.

Thoughts?

Luke

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