On Tue, 20 Feb 2018, Arnd Bergmann wrote: > Trying to build an LTO-Enabled kernel with Thumb2 instructions failed > horribly for me, with an endless output of things like > > ccVnNycO.s:2665: Error: thumb conditional instruction should be in IT block > -- `bxne lr' > ccVnNycO.s:7128: Error: thumb conditional instruction should be in IT block > -- `strexeq r5,r2,[r3]' > ccVnNycO.s:7258: Error: thumb conditional instruction should be in IT block > -- `strexeq lr,r0,[r3]' > ccVnNycO.s:17380: Error: thumb conditional instruction should be in IT block > -- `strexeq r1,r2,[r6]' > ccVnNycO.s:19163: Error: thumb conditional instruction should be in IT block > -- `strexeq r8,r6,[r3]' > ccVnNycO.s:22722: Error: thumb conditional instruction should be in IT block > -- `strexeq r7,r1,[r0]' > ccVnNycO.s:24105: conditional infixes are deprecated in unified syntax > ccVnNycO.s:24105: Error: thumb conditional instruction should be in IT block > -- `sbcccs r1,r1,r3' > ccVnNycO.s:24105: Error: thumb conditional instruction should be in IT block > -- `movcc r3,#0' > ccVnNycO.s:24210: conditional infixes are deprecated in unified syntax > ccVnNycO.s:24210: Error: thumb conditional instruction should be in IT block > -- `sbcccs r2,r2,r3' > ccVnNycO.s:24210: Error: thumb conditional instruction should be in IT block > -- `movcc r3,#0' > > I did not investigate this too much, disabling Thumb2 support when LTO is > set lets me build randconfig kernels. > > Since ARM_SINGLE_ARMV7M is Thumb2-only, I have to disallow LTO for V7-M > targets.
Here's the workaround I sent you on January 2rd: ----- >* #!/bin/bash # work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78353 GCC_ROOT=/opt/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf set -e set -x cd $GCC_ROOT//arm-linux-gnueabihf/bin [ -e fat-as ] && exit 1 mv as fat-as cat > as << EOF #!/bin/bash exec -a "\$0" "\$(dirname "\$0")/fat-as" -mimplicit-it=always "\$@" EOF chmod +x as ----- >8 Nicolas
