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