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c3e425ead4
PowerPC general-purpose registers are historically specified as plain numbers (0-31), which makes them hard to distinguish from immediates. For this reason, include/ppc_asm.tmpl defines aliases named r0-r31. This can still lead to uncaught mistakes if a register is used in place of a number. Instead of (e.g.) 5 use %r5, which will result in an assembler warning if used as a number. Turn these warnings into errors by passing `--fatal-warnings` to the assembler. I verified with gazerbeam_defconfig (MPC83xx) and qemu-ppce500_defconfig (MPC85xx) that this patch results in the same machine code. Signed-off-by: J. Neuschäfer <j.ne@posteo.net>
42 lines
1.3 KiB
Makefile
42 lines
1.3 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0+
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#
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# (C) Copyright 2000-2010
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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LDFLAGS_FINAL += --gc-sections
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LDFLAGS_FINAL += --bss-plt
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PLATFORM_RELFLAGS += -fpic -mrelocatable -ffunction-sections \
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-fdata-sections -mcall-linux
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PF_CPPFLAGS_POWERPC := $(call cc-option,-fno-ira-hoist-pressure,) $(call cc-option,-Xassembler --fatal-warnings,)
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PLATFORM_CPPFLAGS += -D__powerpc__ -ffixed-r2 -m32 $(PF_CPPFLAGS_POWERPC)
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KBUILD_LDFLAGS += -m32 -melf32ppclinux
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#
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# When cross-compiling on NetBSD, we have to define __PPC__ or else we
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# will pick up a va_list declaration that is incompatible with the
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# actual argument lists emitted by the compiler.
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#
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# [Tested on NetBSD/i386 1.5 + cross-powerpc-netbsd-1.3]
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ifeq ($(CROSS_COMPILE),powerpc-netbsd-)
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PLATFORM_CPPFLAGS+= -D__PPC__
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endif
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ifeq ($(CROSS_COMPILE),powerpc-openbsd-)
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PLATFORM_CPPFLAGS+= -D__PPC__
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endif
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# Only test once
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ifneq ($(CONFIG_XPL_BUILD),y)
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archprepare: checkgcc4
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# GCC 3.x is reported to have problems generating the type of relocation
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# that U-Boot wants.
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# See http://lists.denx.de/pipermail/u-boot/2012-September/135156.html
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checkgcc4:
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@if test "$(call cc-name)" = "gcc" -a \
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$(call cc-version) -lt 0400; then \
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echo -n '*** Your GCC is too old, please upgrade to GCC 4.x or newer'; \
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false; \
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fi
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endif
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