From: Waldemar Brodkorb <wbx@xxxxxxxxxxx> Date: Mon, 5 Jun 2017 11:19:41 +0200 > I get a compile/linking error with gcc 7.1 when targeting qemu system > sparc64. > > + objects='arch/sparc/kernel/head_64.o init/built-in.o > --start-group usr/built-in.o arch/sparc/built-in.o > kernel/built-in.o certs/built-in.o mm/built-in.o fs/built-in.o > ipc/built-in.o security/built-in.o crypto/built-in.o > block/built-in.o lib/lib.a arch/sparc/prom/lib.a > arch/sparc/lib/lib.a lib/built-in.o arch/sparc/prom/built-in.o > arch/sparc/lib/built-in.o drivers/built-in.o sound/built-in.o > firmware/built-in.o net/built-in.o virt/built-in.o > --end-group ' > + > /home/wbx/openadk/toolchain_qemu-sparc64_glibc_v9/usr/bin/sparc64-openadk-linux-gnu-ld > -m elf64_sparc --build-id -o vmlinux -T > ./arch/sparc/kernel/vmlinux.lds arch/sparc/kernel/head_64.o > init/built-in.o --start-group usr/built-in.o arch/sparc/built-in.o > kernel/built-in.o certs/built-in.o mm/built-in.o fs/built-in.o > ipc/built-in.o security/built-in.o crypto/built-in.o > block/built-in.o lib/lib.a arch/sparc/prom/lib.a > arch/sparc/lib/lib.a lib/built-in.o arch/sparc/prom/built-in.o > arch/sparc/lib/built-in.o drivers/built-in.o sound/built-in.o > firmware/built-in.o net/built-in.o virt/built-in.o --end-group > ipc/built-in.o: In function `mq_attr_ok': > mqueue.c:(.text+0x6154): undefined reference to `__multi3' > > I tried with Linux 4.11.3, Linus master and David Miller's SPARC > tree from today with the same result. The failing config is attached. GCC seems to be emitting a 128-bit multiply to work out this expression in ipc/mqueue.c: if (attr->mq_msgsize > (~0UL)/attr->mq_maxmsg) return -92; Seems like a bit of an extreme way to do this. But worst case we'll have to add __multi3 to the kernel libraries. -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
