3 # Setup variables for the linker.
5 # LINKER_TYPE is the major type of linker. Currently binutils and lld support
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.
12 # LINKER_FEATURES may contain one or more of the following, based on
13 # linker support for that feature:
15 # - build-id : support for generating a Build-ID note
17 # These variables with an X_ prefix will also be provided if XLD is set.
19 # This file may be included multiple times, but only has effect the first time.
22 .if !target(__<bsd.linker.mk>__)
25 .for ld X_ in LD $${_empty_var_} XLD X_
26 .if ${ld} == "LD" || !empty(XLD)
27 # Try to import LINKER_TYPE and LINKER_VERSION from parent make.
28 # The value is only used/exported for the same environment that impacts
29 # LD and LINKER_* settings here.
30 _exported_vars= ${X_}LINKER_TYPE ${X_}LINKER_VERSION ${X_}LINKER_FEATURES
31 ${X_}_ld_hash= ${${ld}}${MACHINE}${PATH}
32 ${X_}_ld_hash:= ${${X_}_ld_hash:hash}
33 # Only import if none of the vars are set somehow else.
35 .for var in ${_exported_vars}
40 .if ${_can_export} == yes
41 .for var in ${_exported_vars}
42 .if defined(${var}.${${X_}_ld_hash})
43 ${var}= ${${var}.${${X_}_ld_hash}}
48 .if ${ld} == "LD" || (${ld} == "XLD" && ${XLD} != ${LD})
49 .if !defined(${X_}LINKER_TYPE) || !defined(${X_}LINKER_VERSION)
50 _ld_version!= (${${ld}} --version || echo none) | head -n 1
51 .if ${_ld_version} == "none"
52 .warning Unable to determine linker type from ${ld}=${${ld}}
54 .if ${_ld_version:[1..2]} == "GNU ld"
56 _v= ${_ld_version:M[1-9].[0-9]*:[1]}
57 .elif ${_ld_version:[1]} == "LLD"
59 _v= ${_ld_version:[2]}
61 .warning Unknown linker from ${ld}=${${ld}}: ${_ld_version}, defaulting to bfd
65 ${X_}LINKER_VERSION!= echo "${_v:M[1-9].[0-9]*}" | \
66 awk -F. '{print $$1 * 10000 + $$2 * 100 + $$3;}'
70 .if ${${X_}LINKER_TYPE} != "bfd" || ${${X_}LINKER_VERSION} > 21750
71 ${X_}LINKER_FEATURES+= build-id
73 .if ${${X_}LINKER_TYPE} != "lld" || ${${X_}LINKER_VERSION} >= 50000
74 ${X_}LINKER_FEATURES+= filter
79 X_LINKER_TYPE= ${LINKER_TYPE}
80 X_LINKER_VERSION= ${LINKER_VERSION}
81 X_LINKER_FEATURES= ${LINKER_FEATURES}
82 .endif # ${ld} == "LD" || (${ld} == "XLD" && ${XLD} != ${LD})
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}
92 .endif # ${ld} == "LD" || !empty(XLD)
93 .endfor # .for ld in LD XLD
96 .endif # !target(__<bsd.linker.mk>__)