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# LINKER_FREEBSD_VERSION is the linker's internal source version. 20# 21# These variables with an X_ prefix will also be provided if XLD is set. 22# 23# This file may be included multiple times, but only has effect the first time. 24# 25 26.if !target(__<bsd.linker.mk>__) 27__<bsd.linker.mk>__: 28 29.for ld X_ in LD $${_empty_var_} XLD X_ 30.if ${ld} == "LD" || !empty(XLD) 31# Try to import LINKER_TYPE and LINKER_VERSION from parent make. 32# The value is only used/exported for the same environment that impacts 33# LD and LINKER_* settings here. 34_exported_vars= ${X_}LINKER_TYPE ${X_}LINKER_VERSION ${X_}LINKER_FEATURES \ 35 ${X_}LINKER_FREEBSD_VERSION 36${X_}_ld_hash= ${${ld}}${MACHINE}${PATH} 37${X_}_ld_hash:= ${${X_}_ld_hash:hash} 38# Only import if none of the vars are set somehow else. 39_can_export= yes 40.for var in ${_exported_vars} 41.if defined(${var}) 42_can_export= no 43.endif 44.endfor 45.if ${_can_export} == yes 46.for var in ${_exported_vars} 47.if defined(${var}.${${X_}_ld_hash}) 48${var}= ${${var}.${${X_}_ld_hash}} 49.endif 50.endfor 51.endif 52 53.if ${ld} == "LD" || (${ld} == "XLD" && ${XLD} != ${LD}) 54.if !defined(${X_}LINKER_TYPE) || !defined(${X_}LINKER_VERSION) 55_ld_version!= (${${ld}} --version || echo none) | sed -n 1p 56.if ${_ld_version} == "none" 57.warning Unable to determine linker type from ${ld}=${${ld}} 58.endif 59.if ${_ld_version:[1..2]} == "GNU ld" 60${X_}LINKER_TYPE= bfd 61${X_}LINKER_FREEBSD_VERSION= 0 62_v= ${_ld_version:M[1-9].[0-9]*:[1]} 63.elif ${_ld_version:[1]} == "LLD" 64${X_}LINKER_TYPE= lld 65_v= ${_ld_version:[2]} 66${X_}LINKER_FREEBSD_VERSION!= \ 67 ${${ld}} --version | \ 68 awk '$$3 ~ /FreeBSD/ {print substr($$4, 1, length($$4)-1)}' 69.else 70.warning Unknown linker from ${ld}=${${ld}}: ${_ld_version}, defaulting to bfd 71${X_}LINKER_TYPE= bfd 72_v= 2.17.50 73.endif 74${X_}LINKER_VERSION!= echo "${_v:M[1-9].[0-9]*}" | \ 75 awk -F. '{print $$1 * 10000 + $$2 * 100 + $$3;}' 76.undef _ld_version 77.undef _v 78${X_}LINKER_FEATURES= 79.if ${${X_}LINKER_TYPE} != "bfd" || ${${X_}LINKER_VERSION} > 21750 80${X_}LINKER_FEATURES+= build-id 81${X_}LINKER_FEATURES+= ifunc 82.endif 83.if ${${X_}LINKER_TYPE} != "lld" || ${${X_}LINKER_VERSION} >= 50000 84${X_}LINKER_FEATURES+= filter 85.endif 86.if ${${X_}LINKER_TYPE} == "lld" && ${${X_}LINKER_VERSION} >= 60000 87${X_}LINKER_FEATURES+= retpoline 88.endif 89.endif 90.else 91# Use LD's values 92X_LINKER_TYPE= ${LINKER_TYPE} 93X_LINKER_VERSION= ${LINKER_VERSION} 94X_LINKER_FEATURES= ${LINKER_FEATURES} 95X_LINKER_FREEBSD_VERSION= ${LINKER_FREEBSD_VERSION} 96.endif # ${ld} == "LD" || (${ld} == "XLD" && ${XLD} != ${LD}) 97 98# Export the values so sub-makes don't have to look them up again, using the 99# hash key computed above. 100.for var in ${_exported_vars} 101${var}.${${X_}_ld_hash}:= ${${var}} 102.export-env ${var}.${${X_}_ld_hash} 103.undef ${var}.${${X_}_ld_hash} 104.endfor 105 106.endif # ${ld} == "LD" || !empty(XLD) 107.endfor # .for ld in LD XLD 108 109 110.endif # !target(__<bsd.linker.mk>__) 111