kumquat-buildroot/toolchain/toolchain-wrapper.mk
Brandon Maier 7ec9b3abd9 toolchain/toolchain-wrapper: reproducible builds: omit absolute paths from debug symbols
In GCC6 the compiler was made smarter to omit the flag
-fdebug-prefix-map from the DWARF DW_AT_producer section[1]. That flag
contains the absolute path '$(BASE_DIR)' which breaks reproducibility.
Prior to GCC6 however, the only way to omit the flag is to use
-gno-record-gcc-switches which omits all flags.

[1] https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=266cc0c181549c2fb6b50f8f26213cdc89101026

Signed-off-by: Brandon Maier <brandon.maier@rockwellcollins.com>
[Arnout: invert condition to ifeq (,) instead of ifneq (,y)]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
2022-01-08 14:48:22 +01:00

97 lines
3.0 KiB
Makefile

################################################################################
#
# definition of the toolchain wrapper build commands
#
################################################################################
# We use --hash-style=both to increase the compatibility of the generated
# binary with older platforms, except for MIPS, where the only acceptable
# hash style is 'sysv'
ifeq ($(findstring mips,$(HOSTARCH)),mips)
TOOLCHAIN_WRAPPER_HASH_STYLE = sysv
else
TOOLCHAIN_WRAPPER_HASH_STYLE = both
endif
TOOLCHAIN_WRAPPER_ARGS = $($(PKG)_TOOLCHAIN_WRAPPER_ARGS)
TOOLCHAIN_WRAPPER_ARGS += -DBR_SYSROOT='"$(STAGING_SUBDIR)"'
TOOLCHAIN_WRAPPER_OPTS = \
$(ARCH_TOOLCHAIN_WRAPPER_OPTS) \
$(call qstrip,$(BR2_SSP_OPTION)) \
$(call qstrip,$(BR2_TARGET_OPTIMIZATION))
ifeq ($(BR2_REPRODUCIBLE),y)
TOOLCHAIN_WRAPPER_OPTS += -Wl,--build-id=none
ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_8),y)
TOOLCHAIN_WRAPPER_OPTS += -ffile-prefix-map=$(BASE_DIR)=buildroot
else
TOOLCHAIN_WRAPPER_OPTS += -fdebug-prefix-map=$(BASE_DIR)=buildroot
TOOLCHAIN_WRAPPER_OPTS += -D__FILE__=\"\" -D__BASE_FILE__=\"\" -Wno-builtin-macro-redefined
endif
ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_7),)
TOOLCHAIN_WRAPPER_OPTS += -DBR_NEED_SOURCE_DATE_EPOCH
endif
ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_6),)
TOOLCHAIN_WRAPPER_OPTS += -gno-record-gcc-switches
endif
endif
# Disable -ftree-loop-distribute-patterns on microblaze to
# workaround a compiler bug with gcc 10 and -O2, -Os or -O3.
# https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=5879ab5fafedc8f6f9bfe95a4cf8501b0df90edd
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97208
ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_10)$(BR2_microblaze),yy)
TOOLCHAIN_WRAPPER_OPTS += -fno-tree-loop-distribute-patterns
endif
# We create a list like '"-mfoo", "-mbar", "-mbarfoo"' so that each flag is a
# separate argument when used in execv() by the toolchain wrapper.
TOOLCHAIN_WRAPPER_ARGS += \
-DBR_ADDITIONAL_CFLAGS='$(foreach f,$(TOOLCHAIN_WRAPPER_OPTS),"$(f)"$(comma))'
ifeq ($(BR2_CCACHE),y)
TOOLCHAIN_WRAPPER_ARGS += -DBR_CCACHE
endif
ifeq ($(BR2_x86_x1000),y)
TOOLCHAIN_WRAPPER_ARGS += -DBR_OMIT_LOCK_PREFIX
endif
# Avoid FPU bug on XBurst CPUs
ifeq ($(BR2_mips_xburst),y)
# Before gcc 4.6, -mno-fused-madd was needed, after -ffp-contract is
# needed
ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_4_6),y)
TOOLCHAIN_WRAPPER_ARGS += -DBR_FP_CONTRACT_OFF
else
TOOLCHAIN_WRAPPER_ARGS += -DBR_NO_FUSED_MADD
endif
endif
ifeq ($(BR2_CCACHE_USE_BASEDIR),y)
TOOLCHAIN_WRAPPER_ARGS += -DBR_CCACHE_BASEDIR='"$(BASE_DIR)"'
endif
ifeq ($(BR2_PIC_PIE),y)
TOOLCHAIN_WRAPPER_ARGS += -DBR2_PIC_PIE
endif
ifeq ($(BR2_RELRO_PARTIAL),y)
TOOLCHAIN_WRAPPER_ARGS += -DBR2_RELRO_PARTIAL
else ifeq ($(BR2_RELRO_FULL),y)
TOOLCHAIN_WRAPPER_ARGS += -DBR2_RELRO_FULL
endif
define TOOLCHAIN_WRAPPER_BUILD
$(HOSTCC) $(HOST_CFLAGS) $(TOOLCHAIN_WRAPPER_ARGS) \
-s -Wl,--hash-style=$(TOOLCHAIN_WRAPPER_HASH_STYLE) \
toolchain/toolchain-wrapper.c \
-o $(@D)/toolchain-wrapper
endef
define TOOLCHAIN_WRAPPER_INSTALL
$(INSTALL) -D -m 0755 $(@D)/toolchain-wrapper \
$(HOST_DIR)/bin/toolchain-wrapper
endef