On Thu, Oct 27, 2016 at 11:11 AM, Thomas Petazzoni <thomas.petazzoni at free-electrons.com> wrote: > On Thu, 27 Oct 2016 09:07:55 +0000, Alexey Brodkin wrote: > >> > axs101 is using a 770 core, while the toolchain is built for the HS38 >> > core. I'm somewhat surprised that a single ARC toolchain cannot produce >> > code for both 770 and HS38, but it seems to be the case. >> > >> > So you need a separate toolchain for ARC770. >> >> Indeed axs101 uses ARC770 core which is ARCv1 AKA ARCompact ISA while >> axs103 sports the same base-board but CPU daughter-card contains ARC HS38 core >> which has ARCv2 ISA (binary incompatible with ARCompact). >> >> Essentially both gcc and binutils will happily build for both architectures given >> proper options were passed on the command line. But Linux kernel gets linked with >> pre-built libgcc (it is a part of toolchain). And so it all boils down to a requirement >> to have multilibbed uClibc toolchain. Which we don't have. > > Interesting. Why is libgcc linked with the kernel on ARC? I don't think > that's the case on other architectures: the kernel is freestanding and > provides everything that it needs without relying on the compiler > runtime. ARC is not the only one: $ git grep print-libgcc-file-name arch/arc/Makefile:LIBGCC := $(shell $(CC) $(cflags-y) --print-libgcc-file-name) arch/h8300/boot/compressed/Makefile:LIBGCC := $(shell $(CROSS-COMPILE)$(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name) arch/hexagon/Makefile:LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name) arch/m32r/Makefile:LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name) arch/nios2/Makefile:LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) $(KCFLAGS) -print-libgcc-file-name) arch/openrisc/Makefile:LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name) arch/parisc/Makefile:LIBGCC = $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name) arch/tile/Makefile: $(shell $(CC) $(KBUILD_CFLAGS) $(KCFLAGS) -print-libgcc-file-name) arch/xtensa/Makefile:LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name) arch/xtensa/boot/boot-redboot/Makefile:LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name) Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds