dc29454920
This works similar to WITH_SYSTEM_COMPILER added in r300354. It only supports lld via WITH_LLD_BOOTSTRAP. When both SYSTEM_COMPILER and SYSTEM_LINKER logic passes then libclang will not build in cross-tools. If either check fails though then libclang is built. The .info is reworked to notify when libclang will be built since if either clang or lld needs to be rebuilt, but not the other, the notification can lead to confusion on why "clang is building". -fuse-ld= is not used with this method so some combinations of compiler and linker are expected to fail. A new 'make test-system-linker' target is added to see the logic results. Makefile.inc1: CROSS_BINUTILS_PREFIX support had to be moved higher up so that XLD could be set and MK_LLD_BOOTSTRAP disabled before checking SYSTEM_LINKER logic as done with SYSTEM_COMPILER. This also required moving where bsd.linker.mk was read since XLD needs to be set before parsing it. This creates a situation where src.opts.mk can not test LINKER_FEATURES or add LLD_BOOTSTAP to BROKEN_OPTIONS. Reviewed by: emaste (earlier version) Sponsored by: Dell EMC Differential Revision: https://reviews.freebsd.org/D15894
111 lines
3.3 KiB
Makefile
111 lines
3.3 KiB
Makefile
# $FreeBSD$
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# Setup variables for the linker.
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#
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# LINKER_TYPE is the major type of linker. Currently binutils and lld support
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# automatic detection.
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#
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# LINKER_VERSION is a numeric constant equal to:
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# major * 10000 + minor * 100 + tiny
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# It too can be overridden on the command line.
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#
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# LINKER_FEATURES may contain one or more of the following, based on
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# linker support for that feature:
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#
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# - build-id: support for generating a Build-ID note
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# - retpoline: support for generating PLT with retpoline speculative
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# execution vulnerability mitigation
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#
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# LINKER_FREEBSD_VERSION is the linker's internal source version.
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#
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# These variables with an X_ prefix will also be provided if XLD is set.
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#
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# This file may be included multiple times, but only has effect the first time.
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#
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.if !target(__<bsd.linker.mk>__)
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__<bsd.linker.mk>__:
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.for ld X_ in LD $${_empty_var_} XLD X_
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.if ${ld} == "LD" || !empty(XLD)
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# Try to import LINKER_TYPE and LINKER_VERSION from parent make.
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# The value is only used/exported for the same environment that impacts
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# LD and LINKER_* settings here.
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_exported_vars= ${X_}LINKER_TYPE ${X_}LINKER_VERSION ${X_}LINKER_FEATURES \
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${X_}LINKER_FREEBSD_VERSION
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${X_}_ld_hash= ${${ld}}${MACHINE}${PATH}
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${X_}_ld_hash:= ${${X_}_ld_hash:hash}
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# Only import if none of the vars are set somehow else.
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_can_export= yes
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.for var in ${_exported_vars}
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.if defined(${var})
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_can_export= no
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.endif
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.endfor
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.if ${_can_export} == yes
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.for var in ${_exported_vars}
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.if defined(${var}.${${X_}_ld_hash})
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${var}= ${${var}.${${X_}_ld_hash}}
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.endif
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.endfor
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.endif
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.if ${ld} == "LD" || (${ld} == "XLD" && ${XLD} != ${LD})
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.if !defined(${X_}LINKER_TYPE) || !defined(${X_}LINKER_VERSION)
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_ld_version!= (${${ld}} --version || echo none) | sed -n 1p
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.if ${_ld_version} == "none"
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.warning Unable to determine linker type from ${ld}=${${ld}}
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.endif
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.if ${_ld_version:[1..2]} == "GNU ld"
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${X_}LINKER_TYPE= bfd
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${X_}LINKER_FREEBSD_VERSION= 0
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_v= ${_ld_version:M[1-9].[0-9]*:[1]}
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.elif ${_ld_version:[1]} == "LLD"
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${X_}LINKER_TYPE= lld
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_v= ${_ld_version:[2]}
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${X_}LINKER_FREEBSD_VERSION!= \
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${${ld}} --version | \
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awk '$$3 ~ /FreeBSD/ {print substr($$4, 1, length($$4)-1)}'
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.else
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.warning Unknown linker from ${ld}=${${ld}}: ${_ld_version}, defaulting to bfd
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${X_}LINKER_TYPE= bfd
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_v= 2.17.50
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.endif
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${X_}LINKER_VERSION!= echo "${_v:M[1-9].[0-9]*}" | \
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awk -F. '{print $$1 * 10000 + $$2 * 100 + $$3;}'
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.undef _ld_version
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.undef _v
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${X_}LINKER_FEATURES=
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.if ${${X_}LINKER_TYPE} != "bfd" || ${${X_}LINKER_VERSION} > 21750
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${X_}LINKER_FEATURES+= build-id
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${X_}LINKER_FEATURES+= ifunc
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.endif
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.if ${${X_}LINKER_TYPE} != "lld" || ${${X_}LINKER_VERSION} >= 50000
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${X_}LINKER_FEATURES+= filter
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.endif
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.if ${${X_}LINKER_TYPE} == "lld" && ${${X_}LINKER_VERSION} >= 60000
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${X_}LINKER_FEATURES+= retpoline
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.endif
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.endif
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.else
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# Use LD's values
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X_LINKER_TYPE= ${LINKER_TYPE}
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X_LINKER_VERSION= ${LINKER_VERSION}
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X_LINKER_FEATURES= ${LINKER_FEATURES}
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X_LINKER_FREEBSD_VERSION= ${LINKER_FREEBSD_VERSION}
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.endif # ${ld} == "LD" || (${ld} == "XLD" && ${XLD} != ${LD})
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# Export the values so sub-makes don't have to look them up again, using the
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# hash key computed above.
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.for var in ${_exported_vars}
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${var}.${${X_}_ld_hash}:= ${${var}}
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.export-env ${var}.${${X_}_ld_hash}
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.undef ${var}.${${X_}_ld_hash}
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.endfor
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.endif # ${ld} == "LD" || !empty(XLD)
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.endfor # .for ld in LD XLD
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.endif # !target(__<bsd.linker.mk>__)
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