489377c0a4
I noticed that when we build libraries for a different ABI (in CheriBSD) we
were calling ${XCC}/${LD} --version for every directory. It turns out that
this was caused by bsd.compat.mk explicitly setting (X_)COMPILER variables
for that build stage and this stops the _can_export logic from working.
To fix this, we change the check to only set _can_export=no if the variable
is set and it is set to a different value than the cached value.
This noticeably speeds up the tree walk while building compat libraries.
During an upstream amd64 buildworld this also removes 8 --version calls.
Obtained from: CheriBSD
Reviewed By: brooks, emaste
Differential Revision: https://reviews.freebsd.org/D25986
136 lines
4.3 KiB
Makefile
136 lines
4.3 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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_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 ${_ld_version:[1]} == "LLD"
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${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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