157 lines
4.6 KiB
Makefile
157 lines
4.6 KiB
Makefile
# $Id: ldorder.mk,v 1.25 2018/04/24 23:50:26 sjg Exp $
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#
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# @(#) Copyright (c) 2015, Simon J. Gerraty
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#
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# This file is provided in the hope that it will
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# be of use. There is absolutely NO WARRANTY.
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# Permission to copy, redistribute or otherwise
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# use this file is hereby granted provided that
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# the above copyright notice and this notice are
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# left intact.
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#
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# Please send copies of changes and bug-fixes to:
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# sjg@crufty.net
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#
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# Try to compute optimal link order.
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# When using only shared libs link order does not much matter,
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# but archive libs are a different matter.
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# We can construct a graph of .ldorder-lib${LIB*} dependencies
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# and associate each with _LDORDER_USE to output the relevant
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# ld flags.
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# Due to the nature of make, the result will be in the reverse order
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# that we want to feed to ld.
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# So we need to reverse it before use.
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.if !target(_LDORDER_USE)
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# does caller want to use ldorder?
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# yes for prog, normally no for lib
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.if ${.ALLTARGETS:Mldorder} != ""
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_ldorder_use:
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.endif
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# define this if we need a barrier between local and external libs
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# see below
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LDORDER_EXTERN_BARRIER ?= .ldorder-extern-barrier
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.-include <local.ldorder.mk>
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# convert /path/to/libfoo.a into _{LIBFOO}
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LDORDER_INC_FILTER += S,+,PLUS,g S,.so$$,,g
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LDORDER_LIBS_FILTER += O:u
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LDORDER_INC ?= ldorder.inc
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# for meta mode
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REFERENCE_FILE ?= :
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_LDORDER_USE: .ldorder-rm .USE .NOTMAIN
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@echo depends: ${.ALLSRC:M.ldorder-lib*} > /dev/null
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@echo ${LDADD_${.TARGET:T:S,.ldorder-,,}:U${.TARGET:T:S/.ldorder-lib/-l/}} >> .ldorder
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@${META_COOKIE_TOUCH}
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# we need to truncate our working file
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.ldorder-rm: .NOTMAIN
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@rm -f .ldorder ldorder-*
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@${.ALLSRC:O:u:@f@${REFERENCE_FILE} < $f;@}
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@${META_COOKIE_TOUCH}
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# make sure this exists
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.ldorder: .NOTMAIN
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# and finally we need to reverse the order of content
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ldorder: .ldorder .NOTMAIN
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@{ test ! -s .ldorder || cat -n .ldorder | sort -rn | \
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sed '/ldorder-/d;s,^[[:space:]0-9]*,,'; } > ${.TARGET}
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# Initially we hook contents of DPLIBS and DPADD into our graph
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LDORDER_LIBS ?= ${DPLIBS} ${DPADD:M*/lib*} ${__dpadd_libs}
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# we need to remember this
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_LDORDER_LIBS := ${LDORDER_LIBS:${LDORDER_LIBS_FILTER:ts:}}
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.if empty(_LDORDER_LIBS)
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# don't use stale ldorder
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LDADD_LDORDER =
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.else
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# this is how you use it
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LDADD_LDORDER ?= `cat ldorder`
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.endif
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# for debug below
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_ldorder = ${RELDIR}.${TARGET_SPEC}
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# we make have some libs that exist outside of $SB
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# and want to insert a barrier
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.if target(${LDORDER_EXTERN_BARRIER})
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# eg. in local.ldorder.mk
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# ${LDORDER_EXTERN_BARRIER}:
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# @test -z "${extern_ldorders}" || \
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# echo -Wl,-Bdynamic >> .ldorder
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#
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# feel free to put more suitable version in local.ldorder.mk if needed
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# we do *not* count host libs in extern_ldorders
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extern_ldorders ?= ${__dpadd_libs:tA:N/lib*:N/usr/lib*:N${SB}/*:N${SB_OBJROOT:tA}*:T:${LDORDER_LIBS_FILTER:ts:}:R:C/\.so.*//:S,^,.ldorder-,:N.ldorder-}
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sb_ldorders ?= ${.ALLTARGETS:M.ldorder-*:N${LDORDER_EXTERN_BARRIER}:N.ldorder-rm:${extern_ldorders:${M_ListToSkip}}:N.ldorder-}
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# finally in Makefile after include of *.mk put
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# .ldorder ${sb_ldorders}: ${LDORDER_EXTERN_BARRIER}
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# ${LDORDER_EXTERN_BARRIER}: ${extern_ldorders}
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.endif
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.endif # !target(_LDORDER_USE)
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.if !empty(LDORDER_LIBS) && target(_ldorder_use)
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# canonicalize - these are just tokens anyway
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LDORDER_LIBS := ${LDORDER_LIBS:${LDORDER_LIBS_FILTER:ts:}:R:C/\.so.*//}
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_ldorders := ${LDORDER_LIBS:T:Mlib*:S,^,.ldorder-,}
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.for t in ${_ldorders}
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.if !target($t)
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$t: _LDORDER_USE
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.endif
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.endfor
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# and this makes it all happen
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.ldorder: ${_ldorders}
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# this is how we get the dependencies
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.if ${.INCLUDEDFROMFILE:M*.${LDORDER_INC}} != ""
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_ldorder := .ldorder-${.INCLUDEDFROMFILE:S/.${LDORDER_INC}//}
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${_ldorder}: ${_ldorders}
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.ldorder-rm: ${.INCLUDEDFROMDIR}/${.INCLUDEDFROMFILE}
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.endif
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# set DEBUG_LDORDER to pattern[s] that match the dirs of interest
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.if ${DEBUG_LDORDER:Uno:@x@${RELDIR:M$x}@} != ""
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.info ${_ldorder}: ${_ldorders}
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.endif
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# now try to find more ...
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# each *.${LDORDER_INC} should set LDORDER_LIBS to what it needs
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# it can also add to CFLAGS etc.
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.for __inc in ${LDORDER_LIBS:S,$,.${LDORDER_INC},}
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.if !target(__${__inc}__)
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__${__inc}__:
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# make sure this is reset
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LDORDER_LIBS =
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_ldorders =
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.-include <${__inc}>
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.endif
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.endfor
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.endif # !empty(LDORDER_LIBS)
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.ifdef LIB
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# you can make this depend on files (must match *ldorder*)
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# to add extra content - like CFLAGS
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libLDORDER_INC = lib${LIB}.${LDORDER_INC}
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.if !commands(${libLDORDER_INC})
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.if target(ldorder-header)
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${libLDORDER_INC}: ldorder-header
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.endif
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${libLDORDER_INC}:
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@(cat /dev/null ${.ALLSRC:M*ldorder*}; \
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echo 'LDORDER_LIBS= ${_LDORDER_LIBS:T:R:${LDORDER_INC_FILTER:ts:}:tu:C,.*,_{&},:N_{}}'; \
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echo; echo '.include <ldorder.mk>' ) | sed 's,_{,$${,g' > ${.TARGET}
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.endif
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.endif
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