1# $FreeBSD$ 2 3# Setup variables for the linker. 4# 5# LINKER_TYPE is the major type of linker. Currently binutils and lld support 6# automatic detection. 7# 8# LINKER_VERSION is a numeric constant equal to: 9# major * 10000 + minor * 100 + tiny 10# It too can be overridden on the command line. 11# 12# LINKER_FEATURES may contain one or more of the following, based on 13# linker support for that feature: 14# 15# - build-id: support for generating a Build-ID note 16# - retpoline: support for generating PLT with retpoline speculative 17# execution vulnerability mitigation 18# 19# These variables with an X_ prefix will also be provided if XLD is set. 20# 21# This file may be included multiple times, but only has effect the first time. 22# 23 24.if !target(__<bsd.linker.mk>__) 25__<bsd.linker.mk>__: 26 27.for ld X_ in LD $${_empty_var_} XLD X_ 28.if ${ld} == "LD" || !empty(XLD) 29# Try to import LINKER_TYPE and LINKER_VERSION from parent make. 30# The value is only used/exported for the same environment that impacts 31# LD and LINKER_* settings here. 32_exported_vars= ${X_}LINKER_TYPE ${X_}LINKER_VERSION ${X_}LINKER_FEATURES 33${X_}_ld_hash= ${${ld}}${MACHINE}${PATH} 34${X_}_ld_hash:= ${${X_}_ld_hash:hash} 35# Only import if none of the vars are set somehow else. 36_can_export= yes 37.for var in ${_exported_vars} 38.if defined(${var}) 39_can_export= no 40.endif 41.endfor 42.if ${_can_export} == yes 43.for var in ${_exported_vars} 44.if defined(${var}.${${X_}_ld_hash}) 45${var}= ${${var}.${${X_}_ld_hash}} 46.endif 47.endfor 48.endif 49 50.if ${ld} == "LD" || (${ld} == "XLD" && ${XLD} != ${LD}) 51.if !defined(${X_}LINKER_TYPE) || !defined(${X_}LINKER_VERSION) 52_ld_version!= (${${ld}} --version || echo none) | head -n 1 53.if ${_ld_version} == "none" 54.warning Unable to determine linker type from ${ld}=${${ld}} 55.endif 56.if ${_ld_version:[1..2]} == "GNU ld" 57${X_}LINKER_TYPE= bfd 58_v= ${_ld_version:M[1-9].[0-9]*:[1]} 59.elif ${_ld_version:[1]} == "LLD" 60${X_}LINKER_TYPE= lld 61_v= ${_ld_version:[2]} 62.else 63.warning Unknown linker from ${ld}=${${ld}}: ${_ld_version}, defaulting to bfd 64${X_}LINKER_TYPE= bfd 65_v= 2.17.50 66.endif 67${X_}LINKER_VERSION!= echo "${_v:M[1-9].[0-9]*}" | \ 68 awk -F. '{print $$1 * 10000 + $$2 * 100 + $$3;}' 69.undef _ld_version 70.undef _v 71${X_}LINKER_FEATURES= 72.if ${${X_}LINKER_TYPE} != "bfd" || ${${X_}LINKER_VERSION} > 21750 73${X_}LINKER_FEATURES+= build-id 74.endif 75.if ${${X_}LINKER_TYPE} != "lld" || ${${X_}LINKER_VERSION} >= 50000 76${X_}LINKER_FEATURES+= filter 77.endif 78.if ${${X_}LINKER_TYPE} == "lld" && ${${X_}LINKER_VERSION} >= 60000 79${X_}LINKER_FEATURES+= retpoline 80.endif 81.endif 82.else 83# Use LD's values 84X_LINKER_TYPE= ${LINKER_TYPE} 85X_LINKER_VERSION= ${LINKER_VERSION} 86X_LINKER_FEATURES= ${LINKER_FEATURES} 87.endif # ${ld} == "LD" || (${ld} == "XLD" && ${XLD} != ${LD}) 88 89# Export the values so sub-makes don't have to look them up again, using the 90# hash key computed above. 91.for var in ${_exported_vars} 92${var}.${${X_}_ld_hash}:= ${${var}} 93.export-env ${var}.${${X_}_ld_hash} 94.undef ${var}.${${X_}_ld_hash} 95.endfor 96 97.endif # ${ld} == "LD" || !empty(XLD) 98.endfor # .for ld in LD XLD 99 100 101.endif # !target(__<bsd.linker.mk>__) 102