path: root/Makefile.shared

#
# Helper makefile to link shared libraries in a portable way.
# This is much simpler than libtool, and hopefully not too error-prone.
#
# The following variables need to be set on the command line to build
# properly

# CC contains the current compiler.  This one MUST be defined
CC=cc
CFLAGS=$(CFLAG)
# LDFLAGS contains flags to be used when temporary object files (when building
# shared libraries) are created, or when an application is linked.
# SHARED_LDFLAGS contains flags to be used when the shared library is created.
LDFLAGS=$(LDFLAG)
SHARED_LDFLAGS=$(SHARED_LDFLAG)

# SHARED_RCFLAGS are flags used with windres, i.e. when build for Cygwin
# or Mingw.
SHARED_RCFLAGS=$(SHARED_RCFLAG)

NM=nm

# LIBNAME contains just the name of the library, without prefix ("lib"
# on Unix, "cyg" for certain forms under Cygwin...) or suffix (.a, .so,
# .dll, ...).  This one MUST have a value when using this makefile to
# build shared libraries.
# For example, to build libfoo.so, you need to do the following:
#LIBNAME=foo
LIBNAME=

# APPNAME contains just the name of the application, without suffix (""
# on Unix, ".exe" on Windows, ...).  This one MUST have a value when using
# this makefile to build applications.
# For example, to build foo, you need to do the following:
#APPNAME=foo
APPNAME=

# DSTDIR is the directory where the built file should end up in.
DSTDIR=.

# SRCDIR is the top directory of the source tree.
SRCDIR=.

# OBJECTS contains all the object files to link together into the application.
# This must contain at least one object file.
#OBJECTS=foo.o
OBJECTS=

# LIBEXTRAS contains extra modules to link together with the library.
# For example, if a second library, say libbar.a needs to be linked into
# libfoo.so, you need to do the following:
#LIBEXTRAS=libbar.a
# Note that this MUST be used when using the link_dso targets, to hold the
# names of all object files that go into the target shared object.
LIBEXTRAS=

# LIBVERSION contains the current version of the library.
# For example, to build libfoo.so.1.2, you need to do the following:
#LIBVERSION=1.2
LIBVERSION=

# LIBCOMPATVERSIONS contains the compatibility versions (a list) of
# the library.  They MUST be in decreasing order.
# For example, if libfoo.so.1.2.1 is backward compatible with libfoo.so.1.2
# and libfoo.so.1, you need to do the following:
#LIBCOMPATVERSIONS=1.2 1
# Note that on systems that use sonames, the last number will appear as
# part of it.
# It's also possible, for systems that support it (Tru64, for example),
# to add extra compatibility info with more precision, by adding a second
# list of versions, separated from the first with a semicolon, like this:
#LIBCOMPATVERSIONS=1.2 1;1.2.0 1.1.2 1.1.1 1.1.0 1.0.0
LIBCOMPATVERSIONS=

# LIBDEPS contains all the flags necessary to cover all necessary
# dependencies to other libraries.
LIBDEPS=

#------------------------------------------------------------------------------
# The rest is private to this makefile.

SET_X=:
#SET_X=set -x

top:
	echo "Trying to use this makefile interactively?  Don't."

CALC_VERSIONS=	\
	SHLIB_COMPAT=; SHLIB_SOVER=; \
	if [ -n "$(LIBVERSION)$(LIBCOMPATVERSIONS)" ]; then \
		prev=""; \
		for v in `echo "$(LIBVERSION) $(LIBCOMPATVERSIONS)" | cut -d';' -f1`; do \
			SHLIB_SOVER_NODOT=$$v; \
			SHLIB_SOVER=.$$v; \
			if [ -n "$$prev" ]; then \
				SHLIB_COMPAT="$$SHLIB_COMPAT .$$prev"; \
			fi; \
			prev=$$v; \
		done; \
	fi

LINK_APP=	\
  ( $(SET_X);   \
    LIBDEPS="$${LIBDEPS:-$(LIBDEPS)}"; \
    LDCMD="$${LDCMD:-$(CC)}"; LDFLAGS="$${LDFLAGS:-$(CFLAGS) $(LDFLAGS)}"; \
    LIBPATH=`for x in $$LIBDEPS; do echo $$x; done | sed -e 's/^ *-L//;t' -e d | uniq`; \
    LIBPATH=`echo $$LIBPATH | sed -e 's/ /:/g'`; \
    echo LD_LIBRARY_PATH=$$LIBPATH:$$LD_LIBRARY_PATH \
        $${LDCMD} $${LDFLAGS} -o $${APPNAME:=$(APPNAME)} $(OBJECTS) $${LIBDEPS}; \
    LD_LIBRARY_PATH=$$LIBPATH:$$LD_LIBRARY_PATH \
    $${LDCMD} $${LDFLAGS} -o $${APPNAME:=$(APPNAME)} $(OBJECTS) $${LIBDEPS} )

LINK_SO=	\
  ( $(SET_X);   \
    LIBDEPS="$${LIBDEPS:-$(LIBDEPS)}"; \
    SHAREDCMD="$${SHAREDCMD:-$(CC)}"; \
    SHAREDFLAGS="$${SHAREDFLAGS:-$(CFLAGS) $(SHARED_LDFLAGS)}"; \
    LIBPATH=`for x in $$LIBDEPS; do echo $$x; done | sed -e 's/^ *-L//;t' -e d | uniq`; \
    LIBPATH=`echo $$LIBPATH | sed -e 's/ /:/g'`; \
    echo LD_LIBRARY_PATH=$$LIBPATH:$$LD_LIBRARY_PATH \
         $${SHAREDCMD} $${SHAREDFLAGS} \
	     -o $(DSTDIR)/$$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX \
	     $$ALLSYMSFLAGS $$SHOBJECTS $$NOALLSYMSFLAGS $$LIBDEPS; \
    LD_LIBRARY_PATH=$$LIBPATH:$$LD_LIBRARY_PATH \
    $${SHAREDCMD} $${SHAREDFLAGS} \
	-o $(DSTDIR)/$$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX \
	$$ALLSYMSFLAGS $$SHOBJECTS $$NOALLSYMSFLAGS $$LIBDEPS \
  ) && $(SYMLINK_SO)

SYMLINK_SO=	\
	if [ -n "$$INHIBIT_SYMLINKS" ]; then :; else \
		prev=$$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX; \
		if [ -n "$$SHLIB_COMPAT" ]; then \
			for x in $$SHLIB_COMPAT; do \
				( $(SET_X); rm -f $(DSTDIR)/$$SHLIB$$x$$SHLIB_SUFFIX; \
				  ln -s $$prev $(DSTDIR)/$$SHLIB$$x$$SHLIB_SUFFIX ); \
				prev=$$SHLIB$$x$$SHLIB_SUFFIX; \
			done; \
		fi; \
		if [ -n "$$SHLIB_SOVER" ]; then \
			( $(SET_X); rm -f $(DSTDIR)/$$SHLIB$$SHLIB_SUFFIX; \
			  ln -s $$prev $(DSTDIR)/$$SHLIB$$SHLIB_SUFFIX ); \
		fi; \
	fi

LINK_SO_SHLIB=	SHOBJECTS="$(DSTDIR)/lib$(LIBNAME).a $(LIBEXTRAS)"; $(LINK_SO)
LINK_SO_DSO=	INHIBIT_SYMLINKS=yes; SHOBJECTS="$(LIBEXTRAS)"; $(LINK_SO)

LINK_SO_SHLIB_VIA_O=	\
  SHOBJECTS=$(DSTDIR)/lib$(LIBNAME).o; \
  ALL=$$ALLSYMSFLAGS; ALLSYMSFLAGS=; NOALLSYMSFLAGS=; \
  ( echo ld $(LDFLAGS) -r -o $$SHOBJECTS.o $$ALL lib$(LIBNAME).a $(LIBEXTRAS); \
    ld $(LDFLAGS) -r -o $$SHOBJECTS.o $$ALL $(DSTDIR)/lib$(LIBNAME).a $(LIBEXTRAS) ); \
  $(LINK_SO) && ( echo rm -f $$SHOBJECTS; rm -f $$SHOBJECTS )

LINK_SO_SHLIB_UNPACKED=	\
  UNPACKDIR=link_tmp.$$$$; rm -rf $$UNPACKDIR; mkdir $$UNPACKDIR; \
  (cd $$UNPACKDIR; ar x ../$(DSTDIR)/lib$(LIBNAME).a) && \
  ([ -z "$(LIBEXTRAS)" ] || cp $(LIBEXTRAS) $$UNPACKDIR) && \
  SHOBJECTS=$$UNPACKDIR/*.o; \
  $(LINK_SO) && rm -rf $$UNPACKDIR

DETECT_GNU_LD=($(CC) -Wl,-V /dev/null 2>&1 | grep '^GNU ld' )>/dev/null

DO_GNU_SO_COMMON=\
	SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -shared -Wl,-Bsymbolic -Wl,-soname=$$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX"
DO_GNU_DSO=\
	SHLIB=$(LIBNAME).so; \
	SHLIB_SOVER=; \
	SHLIB_SUFFIX=; \
	$(DO_GNU_SO_COMMON)
DO_GNU_SO=\
	$(CALC_VERSIONS); \
	SHLIB=lib$(LIBNAME).so; \
	ALLSYMSFLAGS='-Wl,--whole-archive'; \
	NOALLSYMSFLAGS='-Wl,--no-whole-archive'; \
	$(DO_GNU_SO_COMMON)
DO_GNU_APP=LDFLAGS="$(CFLAGS) $(LDFLAGS) -Wl,-rpath,$(LIBRPATH)"

#This is rather special.  It's a special target with which one can link
#applications without bothering with any features that have anything to
#do with shared libraries, for example when linking against static
#libraries.  It's mostly here to avoid a lot of conditionals everywhere
#else...
link_app.:
	$(LINK_APP)

link_dso.gnu:
	@ $(DO_GNU_DSO); $(LINK_SO_DSO)
link_shlib.gnu:
	@ $(DO_GNU_SO); $(LINK_SO_SHLIB)
link_app.gnu:
	@ $(DO_GNU_APP); $(LINK_APP)

link_shlib.linux-shared:
	@$(PERL) $(SRCDIR)/util/mkdef.pl $(LIBNAME) linux >$(LIBNAME).map; \
	$(DO_GNU_SO); \
	ALLSYMSFLAGS='-Wl,--whole-archive,--version-script=$(LIBNAME).map'; \
	$(LINK_SO_SHLIB)

link_dso.bsd:
	@if $(DETECT_GNU_LD); then $(DO_GNU_DSO); else \
	SHLIB=$(LIBNAME).so; \
	SHLIB_SUFFIX=; \
	LIBDEPS=" "; \
	ALLSYMSFLAGS=; \
	NOALLSYMSFLAGS=; \
	SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -shared -nostdlib"; \
	fi; $(LINK_SO_DSO)
link_shlib.bsd:
	@if $(DETECT_GNU_LD); then $(DO_GNU_SO); else \
	$(CALC_VERSIONS); \
	SHLIB=lib$(LIBNAME).so; \
	SHLIB_SUFFIX=; \
	LIBDEPS=" "; \
	ALLSYMSFLAGS="-Wl,-Bforcearchive"; \
	NOALLSYMSFLAGS=; \
	SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -shared -nostdlib"; \
	fi; $(LINK_SO_SHLIB)
link_app.bsd:
	@if $(DETECT_GNU_LD); then $(DO_GNU_APP); else \
	LDFLAGS="$(CFLAGS) $(LDFLAGS) -Wl,-rpath,$(LIBPATH)"; \
	fi; $(LINK_APP)

# For Darwin AKA Mac OS/X (dyld)
# Originally link_dso.darwin produced .so, because it was hard-coded
# in dso_dlfcn module. At later point dso_dlfcn switched to .dylib
# extension in order to allow for run-time linking with vendor-
# supplied shared libraries such as libz, so that link_dso.darwin had
# to be harmonized with it. This caused minor controversy, because
# it was believed that dlopen can't be used to dynamically load
# .dylib-s, only so called bundle modules (ones linked with -bundle
# flag). The belief seems to be originating from pre-10.4 release,
# where dlfcn functionality was emulated by dlcompat add-on. In
# 10.4 dlopen was rewritten as native part of dyld and is documented
# to be capable of loading both dynamic libraries and bundles. In
# order to provide compatibility with pre-10.4 dlopen, modules are
# linked with -bundle flag, which makes .dylib extension misleading.
# It works, because dlopen is [and always was] extension-agnostic.
# Alternative to this heuristic approach is to develop specific
# MacOS X dso module relying on whichever "native" dyld interface.
link_dso.darwin:
	@ SHLIB=$(LIBNAME); \
	SHLIB_SUFFIX=.dylib; \
	ALLSYMSFLAGS=''; \
	NOALLSYMSFLAGS=''; \
	SHAREDFLAGS="$(CFLAGS) `echo $(SHARED_LDFLAGS) | sed s/dynamiclib/bundle/`"; \
	$(LINK_SO_DSO)
link_shlib.darwin:
	@ $(CALC_VERSIONS); \
	SHLIB=lib$(LIBNAME); \
	SHLIB_SUFFIX=.dylib; \
	ALLSYMSFLAGS='-all_load'; \
	NOALLSYMSFLAGS=''; \
	SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS)"; \
	if [ -n "$(LIBVERSION)" ]; then \
		SHAREDFLAGS="$$SHAREDFLAGS -current_version $(LIBVERSION)"; \
	fi; \
	if [ -n "$$SHLIB_SOVER_NODOT" ]; then \
		SHAREDFLAGS="$$SHAREDFLAGS -compatibility_version $$SHLIB_SOVER_NODOT"; \
	fi; \
	SHAREDFLAGS="$$SHAREDFLAGS -install_name $(INSTALLTOP)/$(LIBDIR)/$$SHLIB$(SHLIB_EXT)"; \
	$(LINK_SO_SHLIB)
link_app.darwin:	# is there run-path on darwin?
	$(LINK_APP)

link_dso.cygwin:
	@SHLIB=$(LIBNAME); \
	SHLIB_SUFFIX=.dll; \
	ALLSYMSFLAGS=''; \
	NOALLSYMSFLAGS=''; \
	base=-Wl,--enable-auto-image-base; \
	SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -shared $$base -Wl,-Bsymbolic"; \
	$(LINK_SO_DSO)
link_shlib.cygwin:
	@ $(CALC_VERSIONS); \
	INHIBIT_SYMLINKS=yes; \
	SHLIB=cyg$(LIBNAME); SHLIB_SOVER=-$(LIBVERSION); SHLIB_SUFFIX=.dll; \
	dll_name=$$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX; \
	echo "$(PERL) $(SRCDIR)/util/mkrc.pl $$dll_name |" \
		     "$(CROSS_COMPILE)windres $(SHARED_RCFLAGS) -o rc.o"; \
	$(PERL) $(SRCDIR)/util/mkrc.pl $$dll_name | \
		$(CROSS_COMPILE)windres $(SHARED_RCFLAGS) -o rc.o; \
	ALLSYMSFLAGS='-Wl,--whole-archive'; \
	NOALLSYMSFLAGS='-Wl,--no-whole-archive'; \
	SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -shared -Wl,--enable-auto-image-base -Wl,-Bsymbolic -Wl,--out-implib,lib$(LIBNAME).dll.a rc.o"; \
	$(LINK_SO_SHLIB) || exit 1; \
	rm rc.o
link_app.cygwin:
	$(LINK_APP)

# link_dso.mingw-shared and link_app.mingw-shared are mapped to the
# corresponding cygwin targets, as they do the exact same thing.
link_shlib.mingw:
	@ $(CALC_VERSIONS); \
	INHIBIT_SYMLINKS=yes; \
	arch=; \
	if expr $(PLATFORM) : mingw64 > /dev/null; then arch=-x64; fi; \
	sover=`echo $(LIBVERSION) | sed -e 's/\./_/g'` ; \
	SHLIB=lib$(LIBNAME); \
	SHLIB_SOVER=-$$sover$$arch; \
	SHLIB_SUFFIX=.dll; \
	dll_name=$$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX; \
	base=; [ $(LIBNAME) = "crypto" -a -n "$(FIPSCANLIB)" ] && base=-Wl,--image-base,0x63000000; \
	$(PERL) $(SRCDIR)/util/mkdef.pl 32 $(LIBNAME) \
		| sed -e 's|^\(LIBRARY  *\)$(LIBNAME)32|\1'"$$dll_name"'|' \
		> $(LIBNAME).def; \
	echo "$(PERL) $(SRCDIR)/util/mkrc.pl $$dll_name |" \
		"$(CROSS_COMPILE)windres $(SHARED_RCFLAGS) -o rc.o"; \
	$(PERL) $(SRCDIR)/util/mkrc.pl $$dll_name | \
		$(CROSS_COMPILE)windres $(SHARED_RCFLAGS) -o rc.o; \
	ALLSYMSFLAGS='-Wl,--whole-archive'; \
	NOALLSYMSFLAGS='-Wl,--no-whole-archive'; \
	SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -shared $$base -Wl,-Bsymbolic -Wl,--out-implib,lib$(LIBNAME).dll.a $(LIBNAME).def rc.o"; \
	$(LINK_SO_SHLIB) || exit 1; \
	rm $(LIBNAME).def rc.o

link_dso.alpha-osf1:
	@ if $(DETECT_GNU_LD); then \
		$(DO_GNU_DSO); \
	else \
		SHLIB=$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		ALLSYMSFLAGS=''; \
		NOALLSYMSFLAGS=''; \
		SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -shared -Wl,-B,symbolic"; \
	fi; \
	$(LINK_SO_DSO)
link_shlib.alpha-osf1:
	@ if $(DETECT_GNU_LD); then \
		$(DO_GNU_SO); \
	else \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		SHLIB_HIST=`echo "$(LIBCOMPATVERSIONS)" | cut -d';' -f2 | sed -e 's/ */:/'`; \
		if [ -n "$$SHLIB_HIST" ]; then \
			SHLIB_HIST="$${SHLIB_HIST}:$(LIBVERSION)"; \
		else \
			SHLIB_HIST="$(LIBVERSION)"; \
		fi; \
		SHLIB_SOVER=; \
		ALLSYMSFLAGS='-all'; \
		NOALLSYMSFLAGS='-none'; \
		SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -shared -Wl,-B,symbolic"; \
		if [ -n "$$SHLIB_HIST" ]; then \
			SHAREDFLAGS="$$SHAREDFLAGS -set_version $$SHLIB_HIST"; \
		fi; \
	fi; \
	$(LINK_SO_SHLIB)
link_app.alpha-osf1:
	@if $(DETECT_GNU_LD); then \
		$(DO_GNU_APP); \
	else \
		LDFLAGS="$(CFLAGS) $(LDFLAGS) -rpath $(LIBRPATH)"; \
	fi; \
	$(LINK_APP)

link_dso.solaris:
	@ if $(DETECT_GNU_LD); then \
		$(DO_GNU_DSO); \
	else \
		$(CALC_VERSIONS); \
		SHLIB=$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		ALLSYMSFLAGS=""; \
		NOALLSYMSFLAGS=""; \
		SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -h $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX -Wl,-Bsymbolic"; \
	fi; \
	$(LINK_SO_DSO)
link_shlib.solaris:
	@ if $(DETECT_GNU_LD); then \
		$(DO_GNU_SO); \
	else \
		$(CALC_VERSIONS); \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=;\
		$(PERL) $(SRCDIR)/util/mkdef.pl $(LIBNAME) linux >$(LIBNAME).map; \
		ALLSYMSFLAGS="-Wl,-z,allextract,-M,$(LIBNAME).map"; \
		NOALLSYMSFLAGS="-Wl,-z,defaultextract"; \
		SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -h $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX -Wl,-Bsymbolic"; \
	fi; \
	$(LINK_SO_SHLIB)
link_app.solaris:
	@ if $(DETECT_GNU_LD); then \
		$(DO_GNU_APP); \
	else \
		LDFLAGS="$(CFLAGS) $(LDFLAGS) -R $(LIBRPATH)"; \
	fi; \
	$(LINK_APP)

# OpenServer 5 native compilers used
link_dso.svr3:
	@ if $(DETECT_GNU_LD); then \
		$(DO_GNU_DSO); \
	else \
		$(CALC_VERSIONS); \
		SHLIB=$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		ALLSYMSFLAGS=''; \
		NOALLSYMSFLAGS=''; \
		SHAREDFLAGS="$(CFLAGS) -G -h $$SHLIB$$SHLIB_SUFFIX"; \
	fi; \
	$(LINK_SO_DSO)
link_shlib.svr3:
	@ if $(DETECT_GNU_LD); then \
		$(DO_GNU_SO); \
	else \
		$(CALC_VERSIONS); \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		ALLSYMSFLAGS=''; \
		NOALLSYMSFLAGS=''; \
		SHAREDFLAGS="$(CFLAGS) -G -h $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX"; \
	fi; \
	$(LINK_SO_SHLIB_UNPACKED)
link_app.svr3:
	@$(DETECT_GNU_LD) && $(DO_GNU_APP); \
	$(LINK_APP)

# UnixWare 7 and OpenUNIX 8 native compilers used
link_dso.svr5:
	@ if $(DETECT_GNU_LD); then \
		$(DO_GNU_DSO); \
	else \
		SHARE_FLAG='-G'; \
		($(CC) -v 2>&1 | grep gcc) > /dev/null && SHARE_FLAG='-shared'; \
		SHLIB=$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		ALLSYMSFLAGS=''; \
		NOALLSYMSFLAGS=''; \
		SHAREDFLAGS="$(CFLAGS) $${SHARE_FLAG} -h $$SHLIB$$SHLIB_SUFFIX"; \
	fi; \
	$(LINK_SO_DSO)
link_shlib.svr5:
	@ if $(DETECT_GNU_LD); then \
		$(DO_GNU_SO); \
	else \
		$(CALC_VERSIONS); \
		SHARE_FLAG='-G'; \
		($(CC) -v 2>&1 | grep gcc) > /dev/null && SHARE_FLAG='-shared'; \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		ALLSYMSFLAGS=''; \
		NOALLSYMSFLAGS=''; \
		SHAREDFLAGS="$(CFLAGS) $${SHARE_FLAG} -h $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX"; \
	fi; \
	$(LINK_SO_SHLIB_UNPACKED)
link_app.svr5:
	@$(DETECT_GNU_LD) && $(DO_GNU_APP); \
	$(LINK_APP)

link_dso.irix:
	@ if $(DETECT_GNU_LD); then \
		$(DO_GNU_DSO); \
	else \
		SHLIB=$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		ALLSYMSFLAGS=""; \
		NOALLSYMSFLAGS=""; \
		SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -shared -Wl,-soname,$$SHLIB$$SHLIB_SUFFIX,-B,symbolic"; \
	fi; \
	$(LINK_SO_DSO)
link_shlib.irix:
	@ if $(DETECT_GNU_LD); then \
		$(DO_GNU_SO); \
	else \
		$(CALC_VERSIONS); \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		MINUSWL=""; \
		($(CC) -v 2>&1 | grep gcc) > /dev/null && MINUSWL="-Wl,"; \
		ALLSYMSFLAGS="$${MINUSWL}-all"; \
		NOALLSYMSFLAGS="$${MINUSWL}-none"; \
		SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -shared -Wl,-soname,$$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX,-B,symbolic"; \
	fi; \
	$(LINK_SO_SHLIB)
link_app.irix:
	@LDFLAGS="$(CFLAGS) $(LDFLAGS) -Wl,-rpath,$(LIBRPATH)"; \
	$(LINK_APP)

# 32-bit PA-RISC HP-UX embeds the -L pathname of libs we link with, so
# we compensate for it with +cdp ../: and +cdp ./:. Yes, these rewrite
# rules imply that we can only link one level down in catalog structure,
# but that's what takes place for the moment of this writing. +cdp option
# was introduced in HP-UX 11.x and applies in 32-bit PA-RISC link
# editor context only [it's simply ignored in other cases, which are all
# ELFs by the way].
#
link_dso.hpux:
	@if $(DETECT_GNU_LD); then $(DO_GNU_DSO); else \
	SHLIB=$(LIBNAME).sl; \
	expr "$(CFLAGS)" : '.*DSO_DLFCN' > /dev/null && SHLIB=$(LIBNAME).so; \
	SHLIB_SUFFIX=; \
	ALLSYMSFLAGS=''; \
	NOALLSYMSFLAGS=''; \
	expr $(PLATFORM) : 'hpux64' > /dev/null && ALLSYMSFLAGS='-Wl,+forceload'; \
	SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -Wl,-B,symbolic,+vnocompatwarnings,-z,+s,+h,$$SHLIB$$SHLIB_SUFFIX,+cdp,../:,+cdp,./:"; \
	fi; \
	rm -f $$SHLIB$$SHLIB_SUFFIX || :; \
	$(LINK_SO_DSO) && chmod a=rx $$SHLIB$$SHLIB_SUFFIX
link_shlib.hpux:
	@if $(DETECT_GNU_LD); then $(DO_GNU_SO); else \
	$(CALC_VERSIONS); \
	SHLIB=lib$(LIBNAME).sl; \
	expr $(PLATFORM) : '.*ia64' > /dev/null && SHLIB=lib$(LIBNAME).so; \
	SHLIB_SUFFIX=; \
	ALLSYMSFLAGS='-Wl,-Fl'; \
	NOALLSYMSFLAGS=''; \
	expr $(PLATFORM) : 'hpux64' > /dev/null && ALLSYMSFLAGS='-Wl,+forceload'; \
	SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -Wl,-B,symbolic,+vnocompatwarnings,-z,+s,+h,$$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX,+cdp,../:,+cdp,./:"; \
	fi; \
	rm -f $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX || :; \
	$(LINK_SO_SHLIB) && chmod a=rx $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX
link_app.hpux:
	@if $(DETECT_GNU_LD); then $(DO_GNU_APP); else \
	LDFLAGS="$(CFLAGS) $(LDFLAGS) -Wl,+s,+cdp,../:,+cdp,./:,+b,$(LIBRPATH)"; \
	fi; \
	$(LINK_APP)

link_dso.aix:
	@OBJECT_MODE=`expr "x$(SHARED_LDFLAGS)" : 'x\-[a-z]*\(64\)'` || :; \
	OBJECT_MODE=$${OBJECT_MODE:-32}; export OBJECT_MODE; \
	SHLIB=$(LIBNAME).so; \
	SHLIB_SUFFIX=; \
	ALLSYMSFLAGS=''; \
	NOALLSYMSFLAGS=''; \
	SHAREDFLAGS='$(CFLAGS) $(SHARED_LDFLAGS) -Wl,-bexpall,-bnolibpath,-bM:SRE'; \
	$(LINK_SO_DSO);
link_shlib.aix:
	@ $(CALC_VERSIONS); \
	OBJECT_MODE=`expr "x$(SHARED_LDFLAGS)" : 'x\-[a-z]*\(64\)'` || : ; \
	OBJECT_MODE=$${OBJECT_MODE:-32}; export OBJECT_MODE; \
	SHLIB=lib$(LIBNAME).so; \
	SHLIB_SUFFIX=; \
	ALLSYMSFLAGS='-bnogc'; \
	NOALLSYMSFLAGS=''; \
	SHAREDFLAGS='$(CFLAGS) $(SHARED_LDFLAGS) -Wl,-bexpall,-bnolibpath,-bM:SRE'; \
	$(LINK_SO_SHLIB_VIA_O)
link_app.aix:
	LDFLAGS="$(CFLAGS) $(LDFLAGS) -Wl,-brtl,-blibpath:$(LIBRPATH):$${LIBPATH:-/usr/lib:/lib}"; \
	$(LINK_APP)


# Targets to build symbolic links when needed
symlink.gnu symlink.solaris symlink.svr3 symlink.svr5 symlink.irix \
symlink.aix:
	@ $(CALC_VERSIONS); \
	SHLIB=lib$(LIBNAME).so; \
	$(SYMLINK_SO)
symlink.darwin:
	@ $(CALC_VERSIONS); \
	SHLIB=lib$(LIBNAME); \
	SHLIB_SUFFIX=.dylib; \
	$(SYMLINK_SO)
symlink.hpux:
	@ $(CALC_VERSIONS); \
	SHLIB=lib$(LIBNAME).sl; \
	expr $(PLATFORM) : '.*ia64' > /dev/null && SHLIB=lib$(LIBNAME).so; \
	$(SYMLINK_SO)
# The following lines means those specific architectures do no symlinks
symlink.cygwin symlink.alpha-osf1 symlink.tru64 symlink.tru64-rpath:

# Compatibility targets
link_dso.bsd-gcc-shared link_dso.linux-shared link_dso.gnu-shared: link_dso.gnu
link_shlib.bsd-gcc-shared: link_shlib.linux-shared
link_shlib.gnu-shared: link_shlib.gnu
link_app.bsd-gcc-shared link_app.linux-shared link_app.gnu-shared: link_app.gnu
symlink.bsd-gcc-shared symlink.bsd-shared symlink.linux-shared symlink.gnu-shared: symlink.gnu
link_dso.bsd-shared: link_dso.bsd
link_shlib.bsd-shared: link_shlib.bsd
link_app.bsd-shared: link_app.bsd
link_dso.darwin-shared: link_dso.darwin
link_shlib.darwin-shared: link_shlib.darwin
link_app.darwin-shared: link_app.darwin
symlink.darwin-shared: symlink.darwin
link_dso.cygwin-shared: link_dso.cygwin
link_shlib.cygwin-shared: link_shlib.cygwin
link_app.cygwin-shared: link_app.cygwin
symlink.cygwin-shared: symlink.cygwin
link_dso.mingw-shared: link_dso.cygwin
link_shlib.mingw-shared: link_shlib.mingw
link_app.mingw-shared: link_app.cygwin
symlink.mingw-shared: symlink.cygwin
link_dso.alpha-osf1-shared: link_dso.alpha-osf1
link_shlib.alpha-osf1-shared: link_shlib.alpha-osf1
link_app.alpha-osf1-shared: link_app.alpha-osf1
symlink.alpha-osf1-shared: symlink.alpha-osf1
link_dso.tru64-shared: link_dso.tru64
link_shlib.tru64-shared: link_shlib.tru64
link_app.tru64-shared: link_app.tru64
symlink.tru64-shared: symlink.tru64
link_dso.tru64-shared-rpath: link_dso.tru64-rpath
link_shlib.tru64-shared-rpath: link_shlib.tru64-rpath
link_app.tru64-shared-rpath: link_app.tru64-rpath
symlink.tru64-shared-rpath: symlink.tru64-rpath
link_dso.solaris-shared: link_dso.solaris
link_shlib.solaris-shared: link_shlib.solaris
link_app.solaris-shared: link_app.solaris
symlink.solaris-shared: symlink.solaris
link_dso.svr3-shared: link_dso.svr3
link_shlib.svr3-shared: link_shlib.svr3
link_app.svr3-shared: link_app.svr3
symlink.svr3-shared: symlink.svr3
link_dso.svr5-shared: link_dso.svr5
link_shlib.svr5-shared: link_shlib.svr5
link_app.svr5-shared: link_app.svr5
symlink.svr5-shared: symlink.svr5
link_dso.irix-shared: link_dso.irix
link_shlib.irix-shared: link_shlib.irix
link_app.irix-shared: link_app.irix
symlink.irix-shared: symlink.irix
link_dso.hpux-shared: link_dso.hpux
link_shlib.hpux-shared: link_shlib.hpux
link_app.hpux-shared: link_app.hpux
symlink.hpux-shared: symlink.hpux
link_dso.aix-shared: link_dso.aix
link_shlib.aix-shared: link_shlib.aix
link_app.aix-shared: link_app.aix
symlink.aix-shared: symlink.aix