99ac8154ff
Create libdl.so.1 as a filter for libc.so.7 which exports public dl* functions. The functions are resolved from the rtld instead, the goal of creating library is to avoid errors from the static linker due to missed libdl. For static binaries, an empty .o is compiled into libdl.a so that static binaries still get dl stubs from libc.a. Right now lld cannot create filter objects, disable libdl on arm64 when binutils are not used. Reviewed by: bdrewery, dim (previos version); emaste Exp run: PR 220525, done by antoine Sponsored by: The FreeBSD Foundation MFC after: 1 month Differential revision: https://reviews.freebsd.org/D11504
97 lines
2.8 KiB
Makefile
97 lines
2.8 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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#
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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_}_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) | head -n 1
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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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_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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.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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.endif
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.if ${${X_}LINKER_TYPE} == "bfd"
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${X_}LINKER_FEATURES+= filter
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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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.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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