-r319936 and -r319991 TARGET_ARCH=powerpc via clang: boot1.chrp/boot1.c:(.text+0x14b8): undefined reference to `__udivdi3' (boot1.o: In function `fsread_size')

[Mark Millard]

[A gcc 4.2.1 based buildworld buildkernel did not have this problem.]

On 2017-Jun-15, at 5:34 PM, Mark Millard <markmi at dsl-only.net> wrote:

> Context: amd64 -> powerpc cross build of -r319936
> (one of my usual clang-based experiments):
> 
> --- all_subdir_sys ---
> Building /usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/sys/boot/powerpc/boot1.chrp/boot1.elf
> --- boot1.elf ---
> boot1.o: In function `fsread_size':
> /usr/src/sys/boot/powerpc/boot1.chrp/boot1.c:(.text+0x14b8): undefined reference to `__udivdi3'
> /usr/src/sys/boot/powerpc/boot1.chrp/boot1.c:(.text+0x1508): undefined reference to `__udivdi3'
> cc: error: linker command failed with exit code 1 (use -v to see invocation)
> --- all_subdir_lib ---
> Building /usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/lib/msun/s_remquo.po
> --- all_subdir_sys ---
> *** [boot1.elf] Error code 1
> 
> make[6]: stopped in /usr/src/sys/boot/powerpc/boot1.chrp
> .ERROR_TARGET='boot1.elf'
> .ERROR_META_FILE='/usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/sys/boot/powerpc/boot1.chrp/boot1.elf.meta'
> 
> 
> # Meta data file /usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/sys/boot/powerpc/boot1.chrp/boot1.elf.meta
> CMD cc -target powerpc-unknown-freebsd12.0 --sysroot=/usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/tmp -B/usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/tmp/usr/bin -ffreestanding -msoft-float -I/usr/src/sys/boot/powerpc/boot1.chrp/../../common -I/usr/src/sys/boot/powerpc/boot1.chrp/../../../ -D_STANDALONE -std=gnu99 -Qunused-arguments -nostdlib -static -Wl,-N -o boot1.elf boot1.o ashldi3.o syncicache.o  
> CWD /usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/sys/boot/powerpc/boot1.chrp
> TARGET boot1.elf
> -- command output --
> boot1.o: In function `fsread_size':
> /usr/src/sys/boot/powerpc/boot1.chrp/boot1.c:(.text+0x14b8): undefined reference to `__udivdi3'
> /usr/src/sys/boot/powerpc/boot1.chrp/boot1.c:(.text+0x1508): undefined reference to `__udivdi3'
> cc: error: linker command failed with exit code 1 (use -v to see invocation)
> *** Error code 1
> 
> Note: This was -j16 for the build.
> 
> I updated /usr/src and amd64 to -r319991 and then
> retried cross building for powerpc: same result.
> 
> 
> Note: I'd frozen at -r317820 until this update. Back then
> I could buildworld and buildkernel via clang (although
> I could not boot the clang-based kernel and so had to
> build a gcc 4.2.1 based one and use it).

I tried a gcc 4.2.1 buildworld buildkernel and it
completed fine.

The __udivdi3 problem is clang toolchain specific.

===
Mark Millard
markmi at dsl-only.net