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https://github.com/freebsd/freebsd-src
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f8147dad44
Recent versions of homebrew's LLD are built with PACKAGE_VENDOR (since
e7c972b606).
This means that the -v output is now
`Homebrew LLD 12.0.1 (compatible with GNU linkers)` and bsd.linker.mk no
longer detects it as LLD since it only checks whether the first word is
LLD. This change allow me to build on macOS again and should unbreak the
GitHub actions CI.
Reviewed By: imp, uqs
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D31224
138 lines
4.4 KiB
Makefile
138 lines
4.4 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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_ld_vars=LD $${_empty_var_}
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.if !empty(_WANT_TOOLCHAIN_CROSS_VARS)
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# Only the toplevel makefile needs to compute the X_LINKER_* variables.
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_ld_vars+=XLD X_
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.endif
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.for ld X_ in ${_ld_vars}
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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 differently 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}) && (!defined(${var}__${${X_}_ld_hash}) || ${${var}__${${X_}_ld_hash}} != ${${var}})
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.if defined(${var}__${${X_}_ld_hash})
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.info "Cannot import ${X_}LINKER variables since cached ${var} is different: ${${var}__${${X_}_ld_hash}} != ${${var}}"
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.endif
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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}} -v 2>&1 || 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 ${_ld_version:MLLD}
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# Strip any leading PACKAGE_VENDOR string (e.g. "Homebrew")
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_ld_version:=${_ld_version:[*]:C/^.* LLD /LLD /:[@]}
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${X_}LINKER_TYPE= lld
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_v= ${_ld_version:[2]}
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.if ${_ld_version:[3]} == "(FreeBSD"
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${X_}LINKER_FREEBSD_VERSION:= ${_ld_version:[4]:C/.*-([^-]*)\)/\1/}
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.else
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${X_}LINKER_FREEBSD_VERSION= 0
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.endif
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.elif ${_ld_version:[1]} == "@(\#)PROGRAM:ld"
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# bootstrap linker on MacOS
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${X_}LINKER_TYPE= mac
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_v= ${_ld_version:[2]:S/PROJECT:ld64-//}
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# Convert version 409.12 to 409.12.0 so that the echo + awk below works
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.if empty(_v:M[1-9]*.[0-9]*.[0-9]*) && !empty(_v:M[1-9]*.[0-9]*)
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_v:=${_v}.0
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.else
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# Some versions do not contain a minor version so we need to append .0.0 there
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_v:=${_v}.0.0
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.endif
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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} == "bfd" && ${${X_}LINKER_VERSION} > 21750
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${X_}LINKER_FEATURES+= riscv-relaxations
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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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.if ${${X_}LINKER_TYPE} == "lld" && ${${X_}LINKER_VERSION} >= 90000
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${X_}LINKER_FEATURES+= ifunc-noplt
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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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