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
# 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=
SHARED_LDFLAGS=

# 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=

# 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_o targets, to hold the
# names of all object files that go into the target library.
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.

#DEBUG=:
DEBUG=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=	\
  ( $(DEBUG);   \
    LIBPATH=`for x in $$LIBDEPS; do if echo $$x | grep '^ *-L' > /dev/null 2>&1; then echo $$x | sed -e 's/^ *-L//'; fi; done | uniq`; \
    LIBPATH=`echo $$LIBPATH | sed -e 's/ /:/g'`; \
    LD_LIBRARY_PATH=$$LIBPATH:$$LD_LIBRARY_PATH \
    $$LDCMD $(LDFLAGS) $$LDFLAGS -o $$APPNAME $(OBJECTS) $$LIBDEPS )

LINK_SO=	\
  ( $(DEBUG);   \
    nm -Pg $$SHOBJECTS | grep ' [BDT] ' | cut -f1 -d' ' > lib$(LIBNAME).exp; \
    LIBPATH=`for x in $$LIBDEPS; do if echo $$x | grep '^ *-L' > /dev/null 2>&1; then echo $$x | sed -e 's/^ *-L//'; fi; done | uniq`; \
    LIBPATH=`echo $$LIBPATH | sed -e 's/ /:/g'`; \
    LD_LIBRARY_PATH=$$LIBPATH:$$LD_LIBRARY_PATH \
    $$SHAREDCMD $(SHARED_LDFLAGS) $$SHAREDFLAGS -o $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX \
	$$ALLSYMSFLAGS $$SHOBJECTS $$NOALLSYMSFLAGS $$LIBDEPS ) && \
  $(SYMLINK_SO); ( $(DEBUG); rm -f lib$(LIBNAME).exp )
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 \
				( $(DEBUG); rm -f $$SHLIB$$x$$SHLIB_SUFFIX; \
				  ln -s $$prev $$SHLIB$$x$$SHLIB_SUFFIX ); \
				prev=$$SHLIB$$x$$SHLIB_SUFFIX; \
			done; \
		fi; \
		if [ -n "$$SHLIB_SOVER" ]; then \
			( $(DEBUG); rm -f $$SHLIB$$SHLIB_SUFFIX; \
			  ln -s $$prev $$SHLIB$$SHLIB_SUFFIX ); \
		fi; \
	fi

LINK_SO_A=	SHOBJECTS="lib$(LIBNAME).a $(LIBEXTRAS)"; $(LINK_SO)
LINK_SO_O=	SHOBJECTS="$(LIBEXTRAS)"; $(LINK_SO)
LINK_SO_A_VIA_O=	\
  SHOBJECTS=lib$(LIBNAME).o; \
  ALL=$$ALLSYMSFLAGS; ALLSYMSFLAGS=; NOALLSYMSFLAGS=; \
  ( $(DEBUG); \
    ld $(LDFLAGS) -r -o lib$(LIBNAME).o $$ALL lib$(LIBNAME).a $(LIBEXTRAS) ); \
  $(LINK_SO) && rm -f $(LIBNAME).o
LINK_SO_A_UNPACKED=	\
  UNPACKDIR=link_tmp.$$$$; rm -rf $$UNPACKDIR; mkdir $$UNPACKDIR; \
  (cd $$UNPACKDIR; ar x ../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=$(CALC_VERSIONS); \
	SHLIB=lib$(LIBNAME).so; \
	SHLIB_SUFFIX=; \
	LIBDEPS="$(LIBDEPS) -lc"; \
	ALLSYMSFLAGS='-Wl,--whole-archive'; \
	NOALLSYMSFLAGS='-Wl,--no-whole-archive'; \
	SHAREDFLAGS="-shared -Wl,-Bsymbolic -Wl,-soname=$$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX -Wl,-rpath,$(LIBRPATH)"; \
	SHAREDCMD='$(CC)'
DO_GNU_APP=LDCMD=$(CC);\
	LDFLAGS="-Wl,-rpath,$(LIBRPATH)"; \
	LIBDEPS="$(LIBDEPS) -lc"; \
	APPNAME=$(APPNAME)

#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.:
	LDCMD=$(CC); \
	LDFLAGS=""; \
	LIBDEPS="$(LIBDEPS)"; \
	APPNAME="$(APPNAME)"; \
	$(LINK_APP)

link_o.gnu:
	@ $(DO_GNU_SO); $(LINK_SO_O)
link_a.gnu:
	@ $(DO_GNU_SO); $(LINK_SO_A)
link_app.gnu:
	@ $(DO_GNU_APP); $(LINK_APP)

# For Darwin AKA Mac OS/X (dyld)
link_o.darwin:
	@ $(CALC_VERSIONS); \
	SHLIB=lib$(LIBNAME); \
	SHLIB_SUFFIX=.dylib; \
	LIBDEPS="$(LIBDEPS) -lc"; \
	ALLSYMSFLAGS='-all_load'; \
	NOALLSYMSFLAGS=''; \
	SHAREDFLAGS="-dynamiclib"; \
	SHAREDCMD='$(CC)'; \
	if [ -n "$(LIBVERSION)" ]; then \
		SHAREDFLAGS="$$SHAREDFLAGS -current_version $(LIBVERSION)"; \
	fi; \
	if [ -n "$$SHLIB_SOVER_NODOT" ]; then \
		SHAREDFLAGS="$$SHAREDFLAGS -compatibility_version $$SHLIB_SOVER_NODOT"; \
	fi; \
	$(LINK_SO_O)
link_a.darwin:
	@ $(CALC_VERSIONS); \
	SHLIB=lib$(LIBNAME); \
	SHLIB_SUFFIX=.dylib; \
	LIBDEPS="$(LIBDEPS) -lc"; \
	ALLSYMSFLAGS='-all_load'; \
	NOALLSYMSFLAGS=''; \
	SHAREDFLAGS="-dynamiclib"; \
	SHAREDCMD='$(CC)'; \
	if [ -n "$(LIBVERSION)" ]; then \
		SHAREDFLAGS="$$SHAREDFLAGS -current_version $(LIBVERSION)"; \
	fi; \
	if [ -n "$$SHLIB_SOVER_NODOT" ]; then \
		SHAREDFLAGS="$$SHAREDFLAGS -compatibility_version $$SHLIB_SOVER_NODOT"; \
	fi; \
	$(LINK_SO_A)
link_app.darwin:
	LDCMD=$(CC);\
	LDFLAGS=""; \
	LIBDEPS="$(LIBDEPS) -lc"; \
	APPNAME="$(APPNAME)"; \
	$(LINK_APP)

link_o.cygwin:
	@ $(CALC_VERSIONS); \
	INHIBIT_SYMLINKS=yes; \
	SHLIB=cyg$(LIBNAME); \
	expr $(PLATFORM) : 'mingw' > /dev/null && SHLIB=$(LIBNAME)eay32; \
	SHLIB_SUFFIX=.dll; \
	LIBDEPS="$(LIBDEPS)"; \
	SHLIB_SOVER=-$(LIBVERSION); \
	ALLSYMSFLAGS='-Wl,--whole-archive'; \
	NOALLSYMSFLAGS='-Wl,--no-whole-archive'; \
	SHAREDFLAGS="-Wl,-Bsymbolic -Wl,--out-implib,lib$(LIBNAME).dll.a"; \
	SHAREDCMD='${CC}'; \
	$(LINK_SO_O)
link_a.cygwin:
	@ $(CALC_VERSIONS); \
	INHIBIT_SYMLINKS=yes; \
	SHLIB=cyg$(LIBNAME); \
	expr $(PLATFORM) : 'mingw' > /dev/null && SHLIB=$(LIBNAME)eay32; \
	SHLIB_SUFFIX=.dll; \
	LIBDEPS="$(LIBDEPS)"; \
	SHLIB_SOVER=; \
	ALLSYMSFLAGS='-Wl,--whole-archive'; \
	NOALLSYMSFLAGS='-Wl,--no-whole-archive'; \
	SHAREDFLAGS="-Wl,-Bsymbolic -Wl,--out-implib,lib$(LIBNAME).dll.a"; \
	SHAREDCMD='${CC}'; \
	$(LINK_SO_A)
link_app.cygwin:
	LDCMD=$(CC);\
	LDFLAGS=""; \
	LIBDEPS="$(LIBDEPS)"; \
	APPNAME="$(APPNAME)"; \
	$(LINK_APP)

link_o.alpha-osf1:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_SO); \
	else \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		SHLIB_HIST=`echo "$(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="-shared"; \
		SHAREDCMD='$(CC)'; \
		if [ -n "$$SHLIB_HIST" ]; then \
			SHAREDFLAGS="$$SHAREDFLAGS -set_version \"$$SHLIB_HIST\""; \
		fi; \
	fi; \
	$(LINK_SO_O)
link_a.alpha-osf1:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_SO); \
	else \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		SHLIB_HIST=`echo "$(LIBCOMPATVERSIONS)" | cut -d';' -f2 | sed -e 's/ */:/'`; \
		if [ -n "$$SHLIB_HIST" ]; then \
			SHLIB_HIST="$${SHLIB_HIST}:$(LIBVERSION)"; \
		else \
			SHLIB_HIST="$(LIBVERSION)"; \
		fi; \
		SHLIB_SOVER=; \
		ALLSYMSFLAGS='-all'; \
		NOALLSYMSFLAGS='-none'; \
		SHAREDFLAGS="-shared"; \
		SHAREDCMD='$(CC)'; \
		if [ -n "$$SHLIB_HIST" ]; then \
			SHAREDFLAGS="$$SHAREDFLAGS -set_version \"$$SHLIB_HIST\""; \
		fi; \
	fi; \
	$(LINK_SO_A)
link_app.alpha-osf1:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_APP); \
	else \
		LDCMD=$(CC);\
		LDFLAGS=""; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		APPNAME="$(APPNAME)"
	fi; \
	$(LINK_APP)

# The difference between alpha-osf1-shared and tru64-shared is the `-msym'
# option passed to the linker.
link_o.tru64:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_SO); \
	else \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		SHLIB_HIST=`echo "$(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="-shared -msym -rpath $(LIBRPATH)"; \
		SHAREDCMD='$(CC)'; \
		if [ -n "$$SHLIB_HIST" ]; then \
			SHAREDFLAGS="$$SHAREDFLAGS -set_version \"$$SHLIB_HIST\""; \
		fi; \
	fi; \
	$(LINK_SO_O)
link_a.tru64:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_SO); \
	else \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		SHLIB_HIST=`echo "$(LIBCOMPATVERSIONS)" | cut -d';' -f2 | sed -e 's/ */:/'`; \
		if [ -n "$$SHLIB_HIST" ]; then \
			SHLIB_HIST="$${SHLIB_HIST}:$(LIBVERSION)"; \
		else \
			SHLIB_HIST="$(LIBVERSION)"; \
		fi; \
		SHLIB_SOVER=; \
		ALLSYMSFLAGS='-all'; \
		NOALLSYMSFLAGS='-none'; \
		SHAREDFLAGS="-shared -msym -rpath $(LIBRPATH)"; \
		SHAREDCMD='$(CC)'; \
		if [ -n "$$SHLIB_HIST" ]; then \
			SHAREDFLAGS="$$SHAREDFLAGS -set_version \"$$SHLIB_HIST\""; \
		fi; \
	fi; \
	$(LINK_SO_A)
link_app.tru64:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_APP); \
	else \
		LDCMD=$(CC);\
		LDFLAGS="-rpath $(LIBRPATH)"; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		APPNAME="$(APPNAME)"; \
	fi; \
	$(LINK_APP)

# The difference between tru64-shared and tru64-shared-rpath is the
# -rpath ${LIBRPATH} passed to the linker.
link_o.tru64-rpath:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_SO); \
	else \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		SHLIB_HIST=`echo "$(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="-shared -msym -rpath $(LIBRPATH)"; \
		SHAREDCMD='$(CC)'; \
		if [ -n "$$SHLIB_HIST" ]; then \
			SHAREDFLAGS="$$SHAREDFLAGS -set_version \"$$SHLIB_HIST\""; \
		fi; \
	fi; \
	$(LINK_SO_O)
link_a.tru64-rpath:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_SO); \
	else \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		SHLIB_HIST=`echo "$(LIBCOMPATVERSIONS)" | cut -d';' -f2 | sed -e 's/ */:/'`; \
		if [ -n "$$SHLIB_HIST" ]; then \
			SHLIB_HIST="$${SHLIB_HIST}:$(LIBVERSION)"; \
		else \
			SHLIB_HIST="$(LIBVERSION)"; \
		fi; \
		SHLIB_SOVER=; \
		ALLSYMSFLAGS='-all'; \
		NOALLSYMSFLAGS='-none'; \
		SHAREDFLAGS="-shared -msym -rpath $(LIBRPATH)"; \
		SHAREDCMD='$(CC)'; \
		if [ -n "$$SHLIB_HIST" ]; then \
			SHAREDFLAGS="$$SHAREDFLAGS -set_version \"$$SHLIB_HIST\""; \
		fi; \
	fi; \
	$(LINK_SO_A)
link_app.tru64-rpath:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_APP); \
	else \
		LDCMD=$(CC);\
		LDFLAGS="-rpath $(LIBRPATH)"; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		APPNAME="$(APPNAME)"; \
	fi; \
	$(LINK_APP)

link_o.solaris:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_SO); \
	else \
		$(CALC_VERSIONS); \
		MINUSZ='-z '; \
		(${CC} -v 2>&1 | grep gcc) > /dev/null && MINUSZ='-Wl,-z,'; \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		ALLSYMSFLAGS="$${MINUSZ}allextract"; \
		NOALLSYMSFLAGS="$${MINUSZ}defaultextract"; \
		SHAREDFLAGS="-G -dy -z text -h $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX -R $(LIBRPATH)"; \
		SHAREDCMD='$(CC)'; \
	fi; \
	$(LINK_SO_O)
link_a.solaris:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_SO); \
	else \
		$(CALC_VERSIONS); \
		MINUSZ='-z '; \
		(${CC} -v 2>&1 | grep gcc) > /dev/null && MINUSZ='-Wl,-z,'; \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=;\
		LIBDEPS="$(LIBDEPS) -lc"; \
		ALLSYMSFLAGS="$${MINUSZ}allextract"; \
		NOALLSYMSFLAGS="$${MINUSZ}defaultextract"; \
		SHAREDFLAGS="-G -dy -z text -h $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX -R $(LIBRPATH)"; \
		SHAREDCMD='$(CC)'; \
	fi; \
	$(LINK_SO_A)
link_app.solaris:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_APP); \
	else \
		LDCMD=$(CC);\
		LDFLAGS="-R $(LIBRPATH)"; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		APPNAME="$(APPNAME)"; \
	fi; \
	$(LINK_APP)

# OpenServer 5 native compilers used
link_o.svr3:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_SO); \
	else \
		$(CALC_VERSIONS); \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		ALLSYMSFLAGS=''; \
		NOALLSYMSFLAGS=''; \
		SHAREDFLAGS="-G -h $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX"; \
		SHAREDCMD='$(CC)'; \
	fi; \
	$(LINK_SO_O)
link_a.svr3:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_SO); \
	else \
		$(CALC_VERSIONS); \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		ALLSYMSFLAGS=''; \
		NOALLSYMSFLAGS=''; \
		SHAREDFLAGS="-G -h $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX"; \
		SHAREDCMD='$(CC)'; \
	fi; \
	$(LINK_SO_A_UNPACKED)
link_app.svr3:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_APP); \
	else \
		LDCMD=$(CC);\
		LDFLAGS=""; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		APPNAME="$(APPNAME)"; \
	fi; \
	$(LINK_APP)

# UnixWare 7 and OpenUNIX 8 native compilers used
link_o.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$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		ALLSYMSFLAGS=''; \
		NOALLSYMSFLAGS=''; \
		SHAREDFLAGS="$${SHARE_FLAG} -h $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX"; \
		SHAREDCMD='$(CC)'; \
	fi; \
	$(LINK_SO_O)
link_a.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$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		ALLSYMSFLAGS=''; \
		NOALLSYMSFLAGS=''; \
		SHAREDFLAGS="$${SHARE_FLAG} -h $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX"; \
		SHAREDCMD='$(CC)'; \
	fi; \
	$(LINK_SO_A_UNPACKED)
link_app.svr5:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_APP); \
	else \
		LDCMD=$(CC);\
		LDFLAGS=""; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		APPNAME="$(APPNAME)"; \
	fi; \
	$(LINK_APP)

link_o.irix:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_SO); \
	else \
		$(CALC_VERSIONS); \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		MINUSWL=""; \
		($(CC) -v 2>&1 | grep gcc) > /dev/null && MINUSWL="-Wl,"; \
		ALLSYMSFLAGS="$${MINUSWL}-all"; \
		NOALLSYMSFLAGS="$${MINUSWL}-notall"; \
		SHAREDFLAGS="-shared -Wl,-soname,$$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX -Wl,-rpath,$(LIBRPATH)"; \
		SHAREDCMD='$(CC)'; \
	fi; \
	$(LINK_SO_O)
link_a.irix:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_SO); \
	else \
		$(CALC_VERSIONS); \
		SHLIB=lib$(LIBNAME).so; \
		SHLIB_SUFFIX=; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		MINUSWL=""; \
		($(CC) -v 2>&1 | grep gcc) > /dev/null && MINUSWL="-Wl,"; \
		ALLSYMSFLAGS="$${MINUSWL}-all"; \
		NOALLSYMSFLAGS="$${MINUSWL}-notall"; \
		SHAREDFLAGS="-shared -Wl,-soname,$$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX -Wl,-rpath,$(LIBRPATH)"; \
		SHAREDCMD='$(CC)'; \
	fi; \
	$(LINK_SO_A)
link_app.irix:
	@ if ${DETECT_GNU_LD}; then \
		$(DO_GNU_APP); \
	else \
		LDCMD=$(CC);\
		LDFLAGS="-Wl,-rpath,$(LIBRPATH)"; \
		LIBDEPS="$(LIBDEPS) -lc"; \
		APPNAME="$(APPNAME)"; \
	fi; \
	$(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_o.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=; \
	LIBDEPS="$(LIBDEPS)"; \
	ALLSYMSFLAGS='-Wl,-Fl'; \
	NOALLSYMSFLAGS=''; \
	expr $(PLATFORM) : 'hpux64' > /dev/null && ALLSYMSFLAGS='-Wl,+forceload'; \
	SHAREDFLAGS="-Wl,-B,symbolic,+vnocompatwarnings,-z,+s,+cdp,../:,+cdp,./:,+h,$$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX,+b,$(LIBRPATH)"; \
	SHAREDCMD=$(CC); \
	fi; \
	$(LINK_SO_O) && chmod a=rx $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX
link_a.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=; \
	LIBDEPS="$(LIBDEPS)"; \
	ALLSYMSFLAGS='-Wl,-Fl'; \
	NOALLSYMSFLAGS=''; \
	expr $(PLATFORM) : 'hpux64' > /dev/null && ALLSYMSFLAGS='-Wl,+forceload'; \
	SHAREDFLAGS="-Wl,-B,symbolic,+vnocompatwarnings,-z,+s,+cdp,../:,+cdp,./:,+h,$$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX,+b,$(LIBRPATH)"; \
	SHAREDCMD='$(CC)'; \
	fi; \
	$(LINK_SO_A) && chmod a=rx $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX
link_app.hpux:
	@if ${DETECT_GNU_LD}; then $(DO_GNU_APP); else \
	LDCMD=$(CC);\
	LDFLAGS="-Wl,+s,+cdp,../:,+cdp,./:,+b,$(LIBRPATH)"; \
	LIBDEPS="$(LIBDEPS)"; \
	APPNAME="$(APPNAME)"; \
	fi; \
	$(LINK_APP)

link_o.aix:
	@ $(CALC_VERSIONS); \
	SHLIB=lib$(LIBNAME).so; \
	SHLIB_SUFFIX=; \
	LIBDEPS="$(LIBDEPS) -lc"; \
	ALLSYMSFLAGS='-bnogc'; \
	NOALLSYMSFLAGS=''; \
	SHAREDFLAGS='-G -bE:lib$(LIBNAME).exp -bM:SRE -blibpath:$(LIBRPATH)'; \
	SHAREDCMD='$(CC)'; \
	$(LINK_SO_O)
link_a.aix:
	@ $(CALC_VERSIONS); \
	SHLIB=lib$(LIBNAME).so; \
	SHLIB_SUFFIX=; \
	LIBDEPS="$(LIBDEPS) -lc"; \
	ALLSYMSFLAGS='-bnogc'; \
	NOALLSYMSFLAGS=''; \
	SHAREDFLAGS='-G -bE:lib$(LIBNAME).exp -bM:SRE -blibpath:$(LIBRPATH)'; \
	SHAREDCMD='$(CC)'; \
	$(LINK_SO_A_VIA_O)
link_app.aix:
	LDCMD=$(CC);\
	LDFLAGS="-blibpath:$(LIBRPATH)"; \
	LIBDEPS="$(LIBDEPS) -lc"; \
	APPNAME="$(APPNAME)"
	$(LINK_APP)

link_o.reliantunix:
	@ $(CALC_VERSIONS); \
	SHLIB=lib$(LIBNAME).so; \
	SHLIB_SUFFIX=; \
	LIBDEPS="$(LIBDEPS) -lc"; \
	ALLSYMSFLAGS=; \
	NOALLSYMSFLAGS=''; \
	SHAREDFLAGS='-G'; \
	SHAREDCMD='$(CC)'; \
	$(LINK_SO_O)
link_a.reliantunix:
	@ $(CALC_VERSIONS); \
	SHLIB=lib$(LIBNAME).so; \
	SHLIB_SUFFIX=; \
	LIBDEPS="$(LIBDEPS) -lc"; \
	ALLSYMSFLAGS=; \
	NOALLSYMSFLAGS=''; \
	SHAREDFLAGS='-G'; \
	SHAREDCMD='$(CC)'; \
	$(LINK_SO_A_UNPACKED)
link_app.reliantunix:
	LDCMD=$(CC);\
	LDFLAGS=""; \
	LIBDEPS="$(LIBDEPS) -lc"; \
	APPNAME="$(APPNAME)"
	$(LINK_APP)

# Targets to build symbolic links when needed
symlink.gnu symlink.solaris symlink.svr3 symlink.svr5 symlink.irix \
symlink.aix symlink.reliantunix:
	@ $(CALC_VERSIONS); \
	SHLIB=lib$(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 symlib.alpha-osf1 symlink.tru64 symlink.tru64-rpath:

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