makefile.shared

mediastreamer2是开源的网络传输媒体流的库

#
# 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=
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.

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="$${LDFLAGS:-$(CFLAGS)}"; \
    LIBPATH=`for x in $$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} $${LDFLAGS} -o $${APPNAME:=$(APPNAME)} $(OBJECTS) $${LIBDEPS} )

LINK_SO=	\
  ( $(SET_X);   \
    LIBDEPS="$${LIBDEPS:-$(LIBDEPS)}"; \
    SHAREDCMD="$${SHAREDCMD:-$(CC)}"; \
    SHAREDFLAGS="$${SHAREDFLAGS:-$(CFLAGS) $(SHARED_LDFLAGS)}"; \
    nm -Pg $$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 \
    $${SHAREDCMD} $${SHAREDFLAGS} \
	-o $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX \
	$$ALLSYMSFLAGS $$SHOBJECTS $$NOALLSYMSFLAGS $$LIBDEPS \
  ) && $(SYMLINK_SO); \
  ( $(SET_X); rm -f lib$(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 \
				( $(SET_X); rm -f $$SHLIB$$x$$SHLIB_SUFFIX; \
				  ln -s $$prev $$SHLIB$$x$$SHLIB_SUFFIX ); \
				prev=$$SHLIB$$x$$SHLIB_SUFFIX; \
			done; \
		fi; \
		if [ -n "$$SHLIB_SOVER" ]; then \
			( $(SET_X); rm -f $$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=$$ALLSYMSFLAGS; ALLSYMSFLAGS=; NOALLSYMSFLAGS=; \
  ( $(SET_X); \
    ld $(LDFLAGS) -r -o lib$(LIBNAME).o $$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=; \
	ALLSYMSFLAGS='-Wl,--whole-archive'; \
	NOALLSYMSFLAGS='-Wl,--no-whole-archive'; \
	SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -shared -Wl,-Bsymbolic -Wl,-soname=$$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX"

DO_GNU_APP=LDFLAGS="$(CFLAGS) -Wl,-rpath,$(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_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)

link_o.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_O)
link_a.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_A)
link_app.bsd:
	@if ${DETECT_GNU_LD}; then $(DO_GNU_APP); else \
	LDFLAGS="$(CFLAGS) -Wl,-rpath,$(LIBPATH)"; \
	fi; $(LINK_APP)

# For Darwin AKA Mac OS/X (dyld)
link_o.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; \
	$(LINK_SO_O)
link_a.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; \
	$(LINK_SO_A)
link_app.darwin:	# is there run-path on darwin?
	$(LINK_APP)

link_o.cygwin:
	@ $(CALC_VERSIONS); \
	INHIBIT_SYMLINKS=yes; \
	SHLIB=cyg$(LIBNAME); \
	expr $(PLATFORM) : 'mingw' > /dev/null && SHLIB=$(LIBNAME)eay32; \
	SHLIB_SUFFIX=.dll; \
	LIBVERSION="$(LIBVERSION)"; \
	SHLIB_SOVER=${LIBVERSION:+"-$(LIBVERSION)"}; \
	ALLSYMSFLAGS='-Wl,--whole-archive'; \
	NOALLSYMSFLAGS='-Wl,--no-whole-archive'; \
	SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -shared -Wl,-Bsymbolic -Wl,--out-implib,lib$(LIBNAME).dll.a"; \
	$(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; \
	SHLIB_SOVER=-$(LIBVERSION); \
	ALLSYMSFLAGS='-Wl,--whole-archive'; \
	NOALLSYMSFLAGS='-Wl,--no-whole-archive'; \
	base=;  [ $(LIBNAME) = "crypto" ] && base=-Wl,--image-base,0x63000000; \
	SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS) -shared $$base -Wl,-Bsymbolic -Wl,--out-implib,lib$(LIBNAME).dll.a"; \
	[ -f apps/$$SHLIB$$SHLIB_SUFFIX ] && rm apps/$$SHLIB$$SHLIB_SUFFIX; \
	[ -f test/$$SHLIB$$SHLIB_SUFFIX ] && rm test/$$SHLIB$$SHLIB_SUFFIX; \
	$(LINK_SO_A) || exit 1; \
	cp -p $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX apps/; \
	cp -p $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX test/
link_app.cygwin:
	$(LINK_APP)

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