# $FreeBSD$ # Setup variables for the linker. # # LINKER_TYPE is the major type of linker. Currently binutils and lld support # automatic detection. # # LINKER_VERSION is a numeric constant equal to: # major * 10000 + minor * 100 + tiny # It too can be overridden on the command line. # # LINKER_FEATURES may contain one or more of the following, based on # linker support for that feature: # # - build-id: support for generating a Build-ID note # - retpoline: support for generating PLT with retpoline speculative # execution vulnerability mitigation # # LINKER_FREEBSD_VERSION is the linker's internal source version. # # These variables with an X_ prefix will also be provided if XLD is set. # # This file may be included multiple times, but only has effect the first time. # .if !target(__<bsd.linker.mk>__) __<bsd.linker.mk>__: _ld_vars=LD $${_empty_var_} .if !empty(_WANT_TOOLCHAIN_CROSS_VARS) # Only the toplevel makefile needs to compute the X_LINKER_* variables. _ld_vars+=XLD X_ .endif .for ld X_ in ${_ld_vars} .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_}LINKER_FEATURES \ ${X_}LINKER_FREEBSD_VERSION ${X_}_ld_hash= ${${ld}}${MACHINE}${PATH} ${X_}_ld_hash:= ${${X_}_ld_hash:hash} # Only import if none of the vars are set differently somehow else. _can_export= yes .for var in ${_exported_vars} .if defined(${var}) && (!defined(${var}__${${X_}_ld_hash}) || ${${var}__${${X_}_ld_hash}} != ${${var}}) .if defined(${var}__${${X_}_ld_hash}) .info Cannot import ${X_}LINKER variables since cached ${var} is different: ${${var}__${${X_}_ld_hash}} != ${${var}} .endif _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} != ${LD}) .if !defined(${X_}LINKER_TYPE) || !defined(${X_}LINKER_VERSION) _ld_version!= (${${ld}} -v 2>&1 || echo none) | sed -n 1p .if ${_ld_version} == "none" .warning Unable to determine linker type from ${ld}=${${ld}} .endif .if ${_ld_version:[1..2]} == "GNU ld" ${X_}LINKER_TYPE= bfd ${X_}LINKER_FREEBSD_VERSION= 0 _v= ${_ld_version:M[1-9]*.[0-9]*:[1]} .elif ${_ld_version:MLLD} # Strip any leading PACKAGE_VENDOR string (e.g. "Homebrew") _ld_version:=${_ld_version:[*]:C/^.* LLD /LLD /:[@]} ${X_}LINKER_TYPE= lld _v= ${_ld_version:[2]} .if ${_ld_version:[3]} == "(FreeBSD" ${X_}LINKER_FREEBSD_VERSION:= ${_ld_version:[4]:C/.*-([^-]*)\)/\1/} .else ${X_}LINKER_FREEBSD_VERSION= 0 .endif .elif ${_ld_version:[1]} == "@(\#)PROGRAM:ld" # bootstrap linker on MacOS ${X_}LINKER_TYPE= mac _v= ${_ld_version:[2]:S/PROJECT:ld64-//} # Convert version 409.12 to 409.12.0 so that the echo + awk below works .if empty(_v:M[1-9]*.[0-9]*.[0-9]*) && !empty(_v:M[1-9]*.[0-9]*) _v:=${_v}.0 .else # Some versions do not contain a minor version so we need to append .0.0 there _v:=${_v}.0.0 .endif .else .warning Unknown linker from ${ld}=${${ld}}: ${_ld_version}, defaulting to bfd ${X_}LINKER_TYPE= bfd _v= 2.17.50 .endif ${X_}LINKER_VERSION!= echo "${_v:M[1-9]*.[0-9]*}" | \ awk -F. '{print $$1 * 10000 + $$2 * 100 + $$3;}' .undef _ld_version .undef _v ${X_}LINKER_FEATURES= .if ${${X_}LINKER_TYPE} != "bfd" || ${${X_}LINKER_VERSION} > 21750 ${X_}LINKER_FEATURES+= build-id ${X_}LINKER_FEATURES+= ifunc .endif .if ${${X_}LINKER_TYPE} == "bfd" && ${${X_}LINKER_VERSION} > 21750 ${X_}LINKER_FEATURES+= riscv-relaxations .endif .if ${${X_}LINKER_TYPE} == "lld" && ${${X_}LINKER_VERSION} >= 60000 ${X_}LINKER_FEATURES+= retpoline .endif .if ${${X_}LINKER_TYPE} == "lld" && ${${X_}LINKER_VERSION} >= 90000 ${X_}LINKER_FEATURES+= ifunc-noplt .endif .endif .else # Use LD's values X_LINKER_TYPE= ${LINKER_TYPE} X_LINKER_VERSION= ${LINKER_VERSION} X_LINKER_FEATURES= ${LINKER_FEATURES} X_LINKER_FREEBSD_VERSION= ${LINKER_FREEBSD_VERSION} .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 .endif # !target(__<bsd.linker.mk>__)