28713169d8
This patch fixes a build failure when using GCC 8.1: /usr/bin/ld: block/partitions/ldm.o: in function `ldm_parse_tocblock': block/partitions/ldm.c:153: undefined reference to `strcmp' This is caused by a new optimization which effectively replaces a strncmp() call with a strcmp() call. This affects a number of strncmp() call sites in the kernel. The entire class of optimizations is avoided with -fno-builtin, which gets enabled by -ffreestanding. This may avoid possible future build failures in case new optimizations appear in future compilers. I haven't done any performance measurements with this patch but I did count the function calls in a defconfig build. For example, there are now 23 more sprintf() calls and 39 fewer strcpy() calls. The effect on the other libc functions is smaller. If this harms performance we can tackle that regression by optimizing the call sites, ideally using semantic patches. That way, clang and ICC builds might benfit too. Cc: stable@vger.kernel.org Reference: https://marc.info/?l=linux-m68k&m=154514816222244&w=2 Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
165 lines
5.2 KiB
Makefile
165 lines
5.2 KiB
Makefile
#
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# m68k/Makefile
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#
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# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies. Remember to do have actions
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# for "archclean" and "archdep" for cleaning up and making dependencies for
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# this architecture
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 1994 by Hamish Macdonald
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# Copyright (C) 2002,2011 Greg Ungerer <gerg@snapgear.com>
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#
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KBUILD_DEFCONFIG := multi_defconfig
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ifneq ($(SUBARCH),$(ARCH))
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ifeq ($(CROSS_COMPILE),)
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CROSS_COMPILE := $(call cc-cross-prefix, \
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m68k-linux-gnu- m68k-linux- m68k-unknown-linux-gnu-)
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endif
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endif
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#
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# Enable processor type. Ordering of these is important - we want to
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# use the minimum processor type of the range we support. The logic
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# for 680x0 will only allow use of the -m68060 or -m68040 if no other
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# 680x0 type is specified - and no option is specified for 68030 or
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# 68020. The other m68k/ColdFire types always specify some type of
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# compiler cpu type flag.
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#
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ifndef CONFIG_M68040
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cpuflags-$(CONFIG_M68060) := -m68060
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endif
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ifndef CONFIG_M68060
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cpuflags-$(CONFIG_M68040) := -m68040
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endif
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cpuflags-$(CONFIG_M68030) :=
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cpuflags-$(CONFIG_M68020) :=
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cpuflags-$(CONFIG_M68000) := -m68000
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cpuflags-$(CONFIG_M5441x) := $(call cc-option,-mcpu=54455,-mcfv4e)
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cpuflags-$(CONFIG_M54xx) := $(call cc-option,-mcpu=5475,-m5200)
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cpuflags-$(CONFIG_M5407) := $(call cc-option,-mcpu=5407,-m5200)
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cpuflags-$(CONFIG_M532x) := $(call cc-option,-mcpu=532x,-m5307)
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cpuflags-$(CONFIG_M537x) := $(call cc-option,-mcpu=537x,-m5307)
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cpuflags-$(CONFIG_M5307) := $(call cc-option,-mcpu=5307,-m5200)
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cpuflags-$(CONFIG_M528x) := $(call cc-option,-mcpu=528x,-m5307)
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cpuflags-$(CONFIG_M5275) := $(call cc-option,-mcpu=5275,-m5307)
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cpuflags-$(CONFIG_M5272) := $(call cc-option,-mcpu=5272,-m5307)
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cpuflags-$(CONFIG_M5271) := $(call cc-option,-mcpu=5271,-m5307)
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cpuflags-$(CONFIG_M523x) := $(call cc-option,-mcpu=523x,-m5307)
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cpuflags-$(CONFIG_M525x) := $(call cc-option,-mcpu=5253,-m5200)
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cpuflags-$(CONFIG_M5249) := $(call cc-option,-mcpu=5249,-m5200)
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cpuflags-$(CONFIG_M520x) := $(call cc-option,-mcpu=5208,-m5200)
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cpuflags-$(CONFIG_M5206e) := $(call cc-option,-mcpu=5206e,-m5200)
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cpuflags-$(CONFIG_M5206) := $(call cc-option,-mcpu=5206,-m5200)
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KBUILD_AFLAGS += $(cpuflags-y)
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KBUILD_CFLAGS += $(cpuflags-y)
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KBUILD_CFLAGS += -pipe -ffreestanding
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ifdef CONFIG_MMU
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# without -fno-strength-reduce the 53c7xx.c driver fails ;-(
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KBUILD_CFLAGS += -fno-strength-reduce -ffixed-a2
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else
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# we can use a m68k-linux-gcc toolchain with these in place
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KBUILD_CFLAGS += -DUTS_SYSNAME=\"uClinux\"
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KBUILD_CFLAGS += -D__uClinux__
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KBUILD_AFLAGS += -D__uClinux__
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endif
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KBUILD_LDFLAGS := -m m68kelf
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KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/m68k/kernel/module.lds
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ifdef CONFIG_SUN3
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LDFLAGS_vmlinux = -N
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endif
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CHECKFLAGS += -D__mc68000__
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ifdef CONFIG_KGDB
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# If configured for kgdb support, include debugging infos and keep the
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# frame pointer
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KBUILD_CFLAGS := $(subst -fomit-frame-pointer,,$(KBUILD_CFLAGS)) -g
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endif
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#
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# Select the assembler head startup code. Order is important. The default
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# head code is first, processor specific selections can override it after.
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#
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head-y := arch/m68k/kernel/head.o
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head-$(CONFIG_SUN3) := arch/m68k/kernel/sun3-head.o
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head-$(CONFIG_M68000) := arch/m68k/68000/head.o
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head-$(CONFIG_COLDFIRE) := arch/m68k/coldfire/head.o
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core-y += arch/m68k/kernel/ arch/m68k/mm/
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libs-y += arch/m68k/lib/
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core-$(CONFIG_Q40) += arch/m68k/q40/
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core-$(CONFIG_AMIGA) += arch/m68k/amiga/
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core-$(CONFIG_ATARI) += arch/m68k/atari/
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core-$(CONFIG_MAC) += arch/m68k/mac/
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core-$(CONFIG_HP300) += arch/m68k/hp300/
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core-$(CONFIG_APOLLO) += arch/m68k/apollo/
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core-$(CONFIG_MVME147) += arch/m68k/mvme147/
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core-$(CONFIG_MVME16x) += arch/m68k/mvme16x/
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core-$(CONFIG_BVME6000) += arch/m68k/bvme6000/
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core-$(CONFIG_SUN3X) += arch/m68k/sun3x/ arch/m68k/sun3/
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core-$(CONFIG_SUN3) += arch/m68k/sun3/ arch/m68k/sun3/prom/
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core-$(CONFIG_NATFEAT) += arch/m68k/emu/
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core-$(CONFIG_M68040) += arch/m68k/fpsp040/
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core-$(CONFIG_M68060) += arch/m68k/ifpsp060/
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core-$(CONFIG_M68KFPU_EMU) += arch/m68k/math-emu/
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core-$(CONFIG_M68000) += arch/m68k/68000/
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core-$(CONFIG_COLDFIRE) += arch/m68k/coldfire/
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all: zImage
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lilo: vmlinux
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if [ -f $(INSTALL_PATH)/vmlinux ]; then mv -f $(INSTALL_PATH)/vmlinux $(INSTALL_PATH)/vmlinux.old; fi
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if [ -f $(INSTALL_PATH)/System.map ]; then mv -f $(INSTALL_PATH)/System.map $(INSTALL_PATH)/System.old; fi
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cat vmlinux > $(INSTALL_PATH)/vmlinux
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cp System.map $(INSTALL_PATH)/System.map
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if [ -x /sbin/lilo ]; then /sbin/lilo; else /etc/lilo/install; fi
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zImage compressed: vmlinux.gz
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vmlinux.gz: vmlinux
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ifndef CONFIG_KGDB
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cp vmlinux vmlinux.tmp
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$(STRIP) vmlinux.tmp
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gzip -9c vmlinux.tmp >vmlinux.gz
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rm vmlinux.tmp
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else
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gzip -9c vmlinux >vmlinux.gz
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endif
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bzImage: vmlinux.bz2
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vmlinux.bz2: vmlinux
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ifndef CONFIG_KGDB
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cp vmlinux vmlinux.tmp
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$(STRIP) vmlinux.tmp
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bzip2 -1c vmlinux.tmp >vmlinux.bz2
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rm vmlinux.tmp
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else
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bzip2 -1c vmlinux >vmlinux.bz2
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endif
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archclean:
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rm -f vmlinux.gz vmlinux.bz2
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archheaders:
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$(Q)$(MAKE) $(build)=arch/m68k/kernel/syscalls all
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install:
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sh $(srctree)/arch/m68k/install.sh $(KERNELRELEASE) vmlinux.gz System.map "$(INSTALL_PATH)"
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