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