1# $Id: dpadd.mk,v 1.29 2021/04/20 02:30:44 sjg Exp $ 2# 3# @(#) Copyright (c) 2004, Simon J. Gerraty 4# 5# This file is provided in the hope that it will 6# be of use. There is absolutely NO WARRANTY. 7# Permission to copy, redistribute or otherwise 8# use this file is hereby granted provided that 9# the above copyright notice and this notice are 10# left intact. 11# 12# Please send copies of changes and bug-fixes to: 13# sjg@crufty.net 14# 15 16## 17# DESCRIPTION: 18# This makefile manages a number of variables that simplify 19# dealing with libs in a build. 20# 21# Primary inputs are DPLIBS, DPADD and SRC_LIBS: 22# 23# DPLIBS 24# List of LIB* that we will actually link with 25# should be in correct link order. 26# DPLIBS is a short-cut to ensure that DPADD and LDADD are 27# kept in sync. 28# 29# DPADD List of LIB* that should already be built. 30# 31# SRC_LIBS 32# List of LIB* that we want headers from, we do *not* 33# require that such libs have been built. 34# 35# The above all get added to DPMAGIC_LIBS which is what we 36# process. 37# 38# We expect LIB* to be set to absolute path of a library - 39# suitable for putting in DPADD. 40# eg. 41# 42# LIBC ?= ${OBJTOP}/lib/libc/libc.a 43# 44# From such a path we can derrive a number of other variables 45# for which we can supply sensible default values. 46# We name all these variables for the basename of the library 47# (libc in our example above -- ${__lib:T:R} in below): 48# 49# LDADD_${__lib:T:R}: 50# What should be added to LDADD (eg -lc) 51# 52# OBJ_${__lib:T:R}: 53# This is trivial - just the dirname of the built library. 54# 55# SRC_${__lib:T:R}: 56# Where the src for ${__lib} is, if LIB* is set as above 57# we can simply substitute ${SRCTOP} for ${OBJTOP} in 58# the dirname. 59# 60# INCLUDES_${__lib:T:R}: 61# What should be added to CFLAGS 62# 63# If the directory ${SRC_${__lib:T:R}}/h exists we will 64# only add -I${SRC_${__lib:T:R}}/h on the basis that 65# this is where the public api is kept. 66# 67# Otherwise default will be -I${OBJ_${__lib:T:R}} 68# -I${SRC_${__lib:T:R}} 69# 70# Note much of the above is skipped for staged libs 71# eg. 72# LIBC ?= ${STAGE_OBJTOP}/usr/lib/libc.a 73# 74# Since we can safely assume that -I${STAGE_OBJTOP}/usr/include 75# and -L${STAGE_OBJTOP}/usr/lib are sufficient, and we should 76# have no need of anything else. 77# 78 79.if !target(__${.PARSEFILE}__) 80__${.PARSEFILE}__: 81 82# sometimes we play games with .CURDIR etc 83# _* hold the original values of .* 84_OBJDIR?= ${.OBJDIR} 85_CURDIR?= ${.CURDIR} 86 87.if ${_CURDIR} == ${SRCTOP} 88RELDIR=. 89RELTOP=. 90.else 91RELDIR?= ${_CURDIR:S,${SRCTOP}/,,} 92.if ${RELDIR} == ${_CURDIR} 93RELDIR?= ${_OBJDIR:S,${OBJTOP}/,,} 94.endif 95RELTOP?= ${RELDIR:C,[^/]+,..,g} 96.endif 97RELOBJTOP?= ${OBJTOP} 98RELSRCTOP?= ${SRCTOP} 99 100# we get included just about everywhere so this is handy... 101# C*DEBUG_XTRA are for defining on cmd line etc 102# so do not use in makefiles. 103.ifdef CFLAGS_DEBUG_XTRA 104CFLAGS_LAST += ${CFLAGS_DEBUG_XTRA} 105.endif 106.ifdef CXXFLAGS_DEBUG_XTRA 107CXXFLAGS_LAST += ${CXXFLAGS_DEBUG_XTRA} 108.endif 109 110.-include <local.dpadd.mk> 111 112# DPLIBS helps us ensure we keep DPADD and LDADD in sync 113DPLIBS+= ${DPLIBS_LAST} 114DPADD+= ${DPLIBS:N-*} 115.for __lib in ${DPLIBS} 116.if "${__lib:M-*}" != "" 117LDADD += ${__lib} 118.else 119LDADD += ${LDADD_${__lib:T:R}:U${__lib:T:R:S/lib/-l/:C/\.so.*//}} 120.endif 121.endfor 122 123# DPADD can contain things other than libs 124__dpadd_libs := ${DPADD:M*/lib*} 125 126.if defined(PROG) && ${MK_PROG_LDORDER_MK:Uno} != "no" 127# some libs have dependencies... 128# DPLIBS_* allows bsd.libnames.mk to flag libs which must be included 129# in DPADD for a given library. 130# Gather all such dependencies into __ldadd_all_xtras 131# dups will be dealt with later. 132# Note: libfoo_pic uses DPLIBS_libfoo 133__ldadd_all_xtras= 134.for __lib in ${__dpadd_libs:@d@${DPLIBS_${d:T:R:S,_pic,,}}@} 135__ldadd_all_xtras+= ${LDADD_${__lib}:U${__lib:T:R:S/lib/-l/:C/\.so.*//}} 136.if "${DPADD:M${__lib}}" == "" 137DPADD+= ${__lib} 138.endif 139.endfor 140.endif 141# Last of all... for libc and libgcc 142DPADD+= ${DPADD_LAST} 143 144# de-dupuplicate __ldadd_all_xtras into __ldadd_xtras 145# in reverse order so that libs end up listed after all that needed them. 146__ldadd_xtras= 147.for __lib in ${__ldadd_all_xtras:[-1..1]} 148.if "${__ldadd_xtras:M${__lib}}" == "" || ${NEED_IMPLICIT_LDADD:tl:Uno} != "no" 149__ldadd_xtras+= ${__lib} 150.endif 151.endfor 152 153.if !empty(__ldadd_xtras) 154# now back to the original order 155__ldadd_xtras:= ${__ldadd_xtras:[-1..1]} 156LDADD+= ${__ldadd_xtras} 157.endif 158 159# Convert DPADD into -I and -L options and add them to CPPFLAGS and LDADD 160# For the -I's convert the path to a relative one. For separate objdirs 161# the DPADD paths will be to the obj tree so we need to subst anyway. 162 163# update this 164__dpadd_libs := ${DPADD:M*/lib*} 165 166# Order -L's to search ours first. 167# Avoids picking up old versions already installed. 168__dpadd_libdirs := ${__dpadd_libs:R:H:S/^/-L/g:O:u:N-L} 169LDADD += ${__dpadd_libdirs:M-L${OBJTOP}/*} 170LDADD += ${__dpadd_libdirs:N-L${OBJTOP}/*:N-L${HOST_LIBDIR:U/usr/lib}} 171.if defined(HOST_LIBDIR) && ${HOST_LIBDIR} != "/usr/lib" 172LDADD+= -L${HOST_LIBDIR} 173.endif 174 175.if !make(dpadd) 176.ifdef LIB 177# Each lib is its own src_lib, we want to include it in SRC_LIBS 178# so that the correct INCLUDES_* will be picked up automatically. 179SRC_LIBS+= ${_OBJDIR}/lib${LIB}.a 180.endif 181.endif 182 183# 184# This little bit of magic, assumes that SRC_libfoo will be 185# set if it cannot be correctly derrived from ${LIBFOO} 186# Note that SRC_libfoo and INCLUDES_libfoo should be named for the 187# actual library name not the variable name that might refer to it. 188# 99% of the time the two are the same, but the DPADD logic 189# only has the library name available, so stick to that. 190# 191 192SRC_LIBS?= 193# magic_libs includes those we want to link with 194# as well as those we might look at 195__dpadd_magic_libs += ${__dpadd_libs} ${SRC_LIBS} 196DPMAGIC_LIBS += ${__dpadd_magic_libs} \ 197 ${__dpadd_magic_libs:@d@${DPMAGIC_LIBS_${d:T:R}}@} 198 199# we skip this for staged libs 200.for __lib in ${DPMAGIC_LIBS:O:u:N${STAGE_OBJTOP:Unot}*/lib/*} 201# 202# if SRC_libfoo is not set, then we assume that the srcdir corresponding 203# to where we found the library is correct. 204# 205SRC_${__lib:T:R} ?= ${__lib:H:S,${OBJTOP},${RELSRCTOP},} 206# 207# This is a no-brainer but just to be complete... 208# 209OBJ_${__lib:T:R} ?= ${__lib:H:S,${OBJTOP},${RELOBJTOP},} 210# 211# If INCLUDES_libfoo is not set, then we'll use ${SRC_libfoo}/h if it exists, 212# else just ${SRC_libfoo}. 213# 214.if !empty(SRC_${__lib:T:R}) 215INCLUDES_${__lib:T:R} ?= -I${exists(${SRC_${__lib:T:R}}/h):?${SRC_${__lib:T:R}}/h:${SRC_${__lib:T:R}}} 216.endif 217.endfor 218 219# even for staged libs we sometimes 220# need to allow direct -I to avoid cicular dependencies 221.for __lib in ${DPMAGIC_LIBS:O:u:T:R} 222.if !empty(SRC_${__lib}) && empty(INCLUDES_${__lib}) 223# must be a staged lib 224.if exists(${SRC_${__lib}}/h) 225INCLUDES_${__lib} = -I${SRC_${__lib}}/h 226.else 227INCLUDES_${__lib} = -I${SRC_${__lib}} 228.endif 229.endif 230.endfor 231 232# when linking a shared lib, avoid non pic libs 233SHLDADD+= ${LDADD:N-[lL]*} 234.for __lib in ${__dpadd_libs:u} 235.if defined(SHLIB_NAME) && ${LDADD:M-l${__lib:T:R:S,lib,,}} != "" 236.if ${__lib:T:N*_pic.a:N*.so} == "" || exists(${__lib:R}.so) 237SHLDADD+= -l${__lib:T:R:S,lib,,} 238.elif exists(${__lib:R}_pic.a) 239SHLDADD+= -l${__lib:T:R:S,lib,,}_pic 240.else 241.warning ${RELDIR}.${TARGET_SPEC} needs ${__lib:T:R}_pic.a 242SHLDADD+= -l${__lib:T:R:S,lib,,} 243.endif 244SHLDADD+= -L${__lib:H} 245.endif 246.endfor 247 248# Now for the bits we actually need 249__dpadd_incs= 250.for __lib in ${__dpadd_libs:u} 251.if (make(${PROG}_p) || defined(NEED_GPROF)) && exists(${__lib:R}_p.a) 252__ldadd=-l${__lib:T:R:S,lib,,} 253LDADD := ${LDADD:S,^${__ldadd}$,${__ldadd}_p,g} 254.endif 255.endfor 256 257# 258# We take care of duplicate suppression later. 259# don't apply :T:R too early 260__dpadd_incs += ${__dpadd_magic_libs:u:@x@${INCLUDES_${x:T:R}}@} 261__dpadd_incs += ${__dpadd_magic_libs:O:u:@s@${SRC_LIBS_${s:T:R}:U}@:@x@${INCLUDES_${x:T:R}}@} 262 263__dpadd_last_incs += ${__dpadd_magic_libs:u:@x@${INCLUDES_LAST_${x:T:R}}@} 264__dpadd_last_incs += ${__dpadd_magic_libs:O:u:@s@${SRC_LIBS_${s:T:R}:U}@:@x@${INCLUDES_LAST_${x:T:R}}@} 265 266.if defined(HOSTPROG) || ${MACHINE:Nhost*} == "" 267# we want any -I/usr/* last 268__dpadd_last_incs := \ 269 ${__dpadd_last_incs:N-I/usr/*} \ 270 ${__dpadd_incs:M-I/usr/*} \ 271 ${__dpadd_last_incs:M-I/usr/*} 272__dpadd_incs := ${__dpadd_incs:N-I/usr/*} 273.endif 274 275# 276# eliminate any duplicates - but don't mess with the order 277# force evaluation now - to avoid giving make a headache 278# 279.for t in CFLAGS CXXFLAGS 280# avoid duplicates 281__$t_incs:=${$t:M-I*:O:u} 282.for i in ${__dpadd_incs} 283.if "${__$t_incs:M$i}" == "" 284$t+= $i 285__$t_incs+= $i 286.endif 287.endfor 288.endfor 289 290.for t in CFLAGS_LAST CXXFLAGS_LAST 291# avoid duplicates 292__$t_incs:=${$t:M-I*:u} 293.for i in ${__dpadd_last_incs} 294.if "${__$t_incs:M$i}" == "" 295$t+= $i 296__$t_incs+= $i 297.endif 298.endfor 299.endfor 300 301# This target is used to gather a list of 302# dir: ${DPADD} 303# entries 304.if make(*dpadd*) 305.if !target(dpadd) 306dpadd: .NOTMAIN 307.if defined(DPADD) && ${DPADD} != "" 308 @echo "${RELDIR}: ${DPADD:S,${OBJTOP}/,,}" 309.endif 310.endif 311.endif 312 313.ifdef SRC_PATHADD 314# We don't want to assume that we need to .PATH every element of 315# SRC_LIBS, but the Makefile cannot do 316# .PATH: ${SRC_libfoo} 317# since the value of SRC_libfoo must be available at the time .PATH: 318# is read - and we only just worked it out. 319# Further, they can't wait until after include of {lib,prog}.mk as 320# the .PATH is needed before then. 321# So we let the Makefile do 322# SRC_PATHADD+= ${SRC_libfoo} 323# and we defer the .PATH: until now so that SRC_libfoo will be available. 324.PATH: ${SRC_PATHADD} 325.endif 326 327# after all that, if doing -n we don't care 328.if ${.MAKEFLAGS:Ux:M-n} != "" 329DPADD = 330.elif ${.MAKE.MODE:Mmeta*} != "" && exists(${.MAKE.DEPENDFILE}) 331DPADD_CLEAR_DPADD ?= yes 332.if ${DPADD_CLEAR_DPADD} == "yes" 333# save this 334__dpadd_libs := ${__dpadd_libs} 335# we have made what use of it we can of DPADD 336DPADD = 337.endif 338.endif 339 340.endif 341