408bc354a9
When using precompiled headers, changing any macros defined on the command line will invalidate the precompiled header. With toolchain-wrapper adding __DATE__ and __TIME__, any commits to Buildroot will invalidate incremental builds regardless of whether the precompiled header actually uses those values (affecting _OVERRIDE_SRCDIR). GCC-7 and later support SOURCE_DATE_EPOCH and use it to define __DATE__ and __TIME__ internally, avoiding any impact on precompiled headers. Disable the custom handling in toolchain-wrapper if GCC is version 7 or newer. Signed-off-by: John Keeping <john@metanate.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
85 lines
2.5 KiB
Makefile
85 lines
2.5 KiB
Makefile
################################################################################
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#
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# definition of the toolchain wrapper build commands
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#
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################################################################################
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# We use --hash-style=both to increase the compatibility of the generated
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# binary with older platforms, except for MIPS, where the only acceptable
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# hash style is 'sysv'
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ifeq ($(findstring mips,$(HOSTARCH)),mips)
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TOOLCHAIN_WRAPPER_HASH_STYLE = sysv
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else
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TOOLCHAIN_WRAPPER_HASH_STYLE = both
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endif
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TOOLCHAIN_WRAPPER_ARGS = $($(PKG)_TOOLCHAIN_WRAPPER_ARGS)
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TOOLCHAIN_WRAPPER_ARGS += -DBR_SYSROOT='"$(STAGING_SUBDIR)"'
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TOOLCHAIN_WRAPPER_OPTS = \
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$(ARCH_TOOLCHAIN_WRAPPER_OPTS) \
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$(call qstrip,$(BR2_SSP_OPTION)) \
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$(call qstrip,$(BR2_TARGET_OPTIMIZATION))
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ifeq ($(BR2_REPRODUCIBLE),y)
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TOOLCHAIN_WRAPPER_OPTS += -Wl,--build-id=none
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ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_8),y)
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TOOLCHAIN_WRAPPER_OPTS += -ffile-prefix-map=$(BASE_DIR)=buildroot
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else
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TOOLCHAIN_WRAPPER_OPTS += -D__FILE__=\"\" -D__BASE_FILE__=\"\" -Wno-builtin-macro-redefined
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endif
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ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_7),)
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TOOLCHAIN_WRAPPER_OPTS += -DBR_NEED_SOURCE_DATE_EPOCH
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endif
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endif
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# We create a list like '"-mfoo", "-mbar", "-mbarfoo"' so that each flag is a
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# separate argument when used in execv() by the toolchain wrapper.
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TOOLCHAIN_WRAPPER_ARGS += \
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-DBR_ADDITIONAL_CFLAGS='$(foreach f,$(TOOLCHAIN_WRAPPER_OPTS),"$(f)"$(comma))'
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ifeq ($(BR2_CCACHE),y)
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TOOLCHAIN_WRAPPER_ARGS += -DBR_CCACHE
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endif
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ifeq ($(BR2_x86_x1000),y)
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TOOLCHAIN_WRAPPER_ARGS += -DBR_OMIT_LOCK_PREFIX
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endif
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# Avoid FPU bug on XBurst CPUs
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ifeq ($(BR2_mips_xburst),y)
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# Before gcc 4.6, -mno-fused-madd was needed, after -ffp-contract is
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# needed
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ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_4_6),y)
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TOOLCHAIN_WRAPPER_ARGS += -DBR_FP_CONTRACT_OFF
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else
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TOOLCHAIN_WRAPPER_ARGS += -DBR_NO_FUSED_MADD
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endif
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endif
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ifeq ($(BR2_CCACHE_USE_BASEDIR),y)
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TOOLCHAIN_WRAPPER_ARGS += -DBR_CCACHE_BASEDIR='"$(BASE_DIR)"'
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endif
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ifeq ($(BR2_PIC_PIE),y)
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TOOLCHAIN_WRAPPER_ARGS += -DBR2_PIC_PIE
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endif
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ifeq ($(BR2_RELRO_PARTIAL),y)
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TOOLCHAIN_WRAPPER_ARGS += -DBR2_RELRO_PARTIAL
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else ifeq ($(BR2_RELRO_FULL),y)
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TOOLCHAIN_WRAPPER_ARGS += -DBR2_RELRO_FULL
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endif
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define TOOLCHAIN_WRAPPER_BUILD
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$(HOSTCC) $(HOST_CFLAGS) $(TOOLCHAIN_WRAPPER_ARGS) \
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-s -Wl,--hash-style=$(TOOLCHAIN_WRAPPER_HASH_STYLE) \
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toolchain/toolchain-wrapper.c \
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-o $(@D)/toolchain-wrapper
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endef
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define TOOLCHAIN_WRAPPER_INSTALL
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$(INSTALL) -D -m 0755 $(@D)/toolchain-wrapper \
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$(HOST_DIR)/bin/toolchain-wrapper
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endef
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