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
16 # - retpoline: support for generating PLT with retpoline speculative
17 # execution vulnerability mitigation
19 # LINKER_FREEBSD_VERSION is the linker's internal source version.
21 # These variables with an X_ prefix will also be provided if XLD is set.
23 # This file may be included multiple times, but only has effect the first time.
26 .if !target(__<bsd.linker.mk>__)
29 .for ld X_ in LD $${_empty_var_} XLD X_
30 .if ${ld} == "LD" || !empty(XLD)
31 # Try to import LINKER_TYPE and LINKER_VERSION from parent make.
32 # The value is only used/exported for the same environment that impacts
33 # LD and LINKER_* settings here.
34 _exported_vars= ${X_}LINKER_TYPE ${X_}LINKER_VERSION ${X_}LINKER_FEATURES \
35 ${X_}LINKER_FREEBSD_VERSION
36 ${X_}_ld_hash= ${${ld}}${MACHINE}${PATH}
37 ${X_}_ld_hash:= ${${X_}_ld_hash:hash}
38 # Only import if none of the vars are set somehow else.
40 .for var in ${_exported_vars}
45 .if ${_can_export} == yes
46 .for var in ${_exported_vars}
47 .if defined(${var}.${${X_}_ld_hash})
48 ${var}= ${${var}.${${X_}_ld_hash}}
53 .if ${ld} == "LD" || (${ld} == "XLD" && ${XLD} != ${LD})
54 .if !defined(${X_}LINKER_TYPE) || !defined(${X_}LINKER_VERSION)
55 _ld_version!= (${${ld}} --version || echo none) | sed -n 1p
56 .if ${_ld_version} == "none"
57 .warning Unable to determine linker type from ${ld}=${${ld}}
59 .if ${_ld_version:[1..2]} == "GNU ld"
61 ${X_}LINKER_FREEBSD_VERSION= 0
62 _v= ${_ld_version:M[1-9].[0-9]*:[1]}
63 .elif ${_ld_version:[1]} == "LLD"
65 _v= ${_ld_version:[2]}
66 ${X_}LINKER_FREEBSD_VERSION!= \
67 ${${ld}} --version | \
68 awk '$$3 ~ /FreeBSD/ {print substr($$4, 1, length($$4)-1)}'
70 .warning Unknown linker from ${ld}=${${ld}}: ${_ld_version}, defaulting to bfd
74 ${X_}LINKER_VERSION!= echo "${_v:M[1-9].[0-9]*}" | \
75 awk -F. '{print $$1 * 10000 + $$2 * 100 + $$3;}'
79 .if ${${X_}LINKER_TYPE} != "bfd" || ${${X_}LINKER_VERSION} > 21750
80 ${X_}LINKER_FEATURES+= build-id
81 ${X_}LINKER_FEATURES+= ifunc
83 .if ${${X_}LINKER_TYPE} != "lld" || ${${X_}LINKER_VERSION} >= 50000
84 ${X_}LINKER_FEATURES+= filter
86 .if ${${X_}LINKER_TYPE} == "lld" && ${${X_}LINKER_VERSION} >= 60000
87 ${X_}LINKER_FEATURES+= retpoline
92 X_LINKER_TYPE= ${LINKER_TYPE}
93 X_LINKER_VERSION= ${LINKER_VERSION}
94 X_LINKER_FEATURES= ${LINKER_FEATURES}
95 X_LINKER_FREEBSD_VERSION= ${LINKER_FREEBSD_VERSION}
96 .endif # ${ld} == "LD" || (${ld} == "XLD" && ${XLD} != ${LD})
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}
106 .endif # ${ld} == "LD" || !empty(XLD)
107 .endfor # .for ld in LD XLD
110 .endif # !target(__<bsd.linker.mk>__)