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Support cached linker values in environment.

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This is similar to r289659 for bsd.compiler.mk.

MFC after:	2 weeks
Reviewed by:	emaste
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D11310
This commit is contained in:
Bryan Drewery 2017-06-22 21:03:27 +00:00
parent 08154765ca
commit 19fad65511
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=320246
1 changed files with 29 additions and 0 deletions
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29
share/mk/bsd.linker.mk
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@ -19,6 +19,27 @@ __<bsd.linker.mk>__:
.for ld X_ in LD $${_empty_var_} XLD X_
.if ${ld} == "LD" || !empty(XLD)
# Try to import LINKER_TYPE and LINKER_VERSION from parent make.
# The value is only used/exported for the same environment that impacts
# LD and LINKER_* settings here.
_exported_vars= ${X_}LINKER_TYPE ${X_}LINKER_VERSION
${X_}_ld_hash= ${${ld}}${MACHINE}${PATH}
${X_}_ld_hash:= ${${X_}_ld_hash:hash}
# Only import if none of the vars are set somehow else.
_can_export= yes
.for var in ${_exported_vars}
.if defined(${var})
_can_export= no
.endif
.endfor
.if ${_can_export} == yes
.for var in ${_exported_vars}
.if defined(${var}.${${X_}_ld_hash})
${var}= ${${var}.${${X_}_ld_hash}}
.endif
.endfor
.endif
.if ${ld} == "LD" || (${ld} == "XLD" && ${XLD} != ${LD})
_ld_version!= ${${ld}} --version 2>/dev/null | head -n 1 || echo none
@ -40,6 +61,14 @@ ${X_}LINKER_VERSION!= echo "${_v:M[1-9].[0-9]*}" | \
.undef _v
.endif # ${ld} == "LD" || (${ld} == "XLD" && ${XLD} != ${LD})
# Export the values so sub-makes don't have to look them up again, using the
# hash key computed above.
.for var in ${_exported_vars}
${var}.${${X_}_ld_hash}:= ${${var}}
.export-env ${var}.${${X_}_ld_hash}
.undef ${var}.${${X_}_ld_hash}
.endfor
.endif # ${ld} == "LD" || !empty(XLD)
.endfor # .for ld in LD XLD