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https://github.com/FFmpeg/FFmpeg.git
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20b0d24c2f
In case of shared builds, some object files containing tables are currently duplicated into other libraries: log2_tab.c, golomb.c, reverse.c. The check for whether this is duplicated is simply whether CONFIG_SHARED is true. Yet this is crude: E.g. libavdevice includes reverse.c for shared builds, but only needs it for the decklink input device, which given that decklink is not enabled by default will be unused in most libavdevice.so. This commit changes this by making it more explicit about what to duplicate from other libraries. To do this, two new Makefile variables were added: SHLIBOBJS and STLIBOBJS. SHLIBOBJS contains the objects that are duplicated from other libraries in case of shared builds; STLIBOBJS contains stuff that a library has to provide for other libraries in case of static builds. These new variables provide a way to enable/disable with a finer granularity than just whether shared builds are enabled or not. E.g. lavd's Makefile now contains: SHLIBOBJS-$(CONFIG_DECKLINK_INDEV) += reverse.o Another example is provided by the golomb tables. These are provided by lavc for static builds, even if one uses a build configuration that makes only lavf use them. Therefore lavc's Makefile contains STLIBOBJS-$(CONFIG_MXF_MUXER) += golomb.o, whereas lavf's Makefile has a corresponding SHLIBOBJS-$(CONFIG_MXF_MUXER) += golomb_tab.o. E.g. in case the MXF muxer is the only component needing these tables only libavformat.so will contain them for shared builds; currently libavcodec.so does so, too. (There is currently a CONFIG_EXTRA group for golomb. But actually one would need two groups (golomb_avcodec and golomb_avformat) in order to know when and where to include these tables. Therefore this commit uses a Makefile-based approach for this and stops using these groups for the users in libavformat.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
124 lines
4.6 KiB
Makefile
124 lines
4.6 KiB
Makefile
include $(SRC_PATH)/ffbuild/common.mak
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ifeq (,$(filter %clean config,$(MAKECMDGOALS)))
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-include $(SUBDIR)lib$(NAME).version
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endif
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LIBVERSION := $(lib$(NAME)_VERSION)
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LIBMAJOR := $(lib$(NAME)_VERSION_MAJOR)
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LIBMINOR := $(lib$(NAME)_VERSION_MINOR)
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INCINSTDIR := $(INCDIR)/lib$(NAME)
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INSTHEADERS := $(INSTHEADERS) $(HEADERS:%=$(SUBDIR)%)
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all-$(CONFIG_STATIC): $(SUBDIR)$(LIBNAME) $(SUBDIR)lib$(FULLNAME).pc
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all-$(CONFIG_SHARED): $(SUBDIR)$(SLIBNAME) $(SUBDIR)lib$(FULLNAME).pc
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LIBOBJS := $(OBJS) $(SHLIBOBJS) $(STLIBOBJS) $(SUBDIR)%.h.o $(TESTOBJS)
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$(LIBOBJS) $(LIBOBJS:.o=.s) $(LIBOBJS:.o=.i): CPPFLAGS += -DHAVE_AV_CONFIG_H
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ifdef CONFIG_SHARED
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# In case both shared libs and static libs are enabled, it can happen
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# that a user might want to link e.g. libavformat statically, but
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# libavcodec and the other libs dynamically. In this case
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# libavformat won't be able to access libavcodec's internal symbols,
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# so that they have to be duplicated into the archive just like
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# for purely shared builds.
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# Test programs are always statically linked against their library
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# to be able to access their library's internals, even with shared builds.
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# Yet linking against dependend libraries still uses dynamic linking.
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# This means that we are in the scenario described above.
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# In case only static libs are used, the linker will only use
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# one of these copies; this depends on the duplicated object files
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# containing exactly the same symbols.
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OBJS += $(SHLIBOBJS)
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endif
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$(SUBDIR)$(LIBNAME): $(OBJS) $(STLIBOBJS)
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$(RM) $@
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$(AR) $(ARFLAGS) $(AR_O) $^
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$(RANLIB) $@
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install-headers: install-lib$(NAME)-headers install-lib$(NAME)-pkgconfig
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install-libs-$(CONFIG_STATIC): install-lib$(NAME)-static
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install-libs-$(CONFIG_SHARED): install-lib$(NAME)-shared
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define RULES
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$(TOOLS): THISLIB = $(FULLNAME:%=$(LD_LIB))
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$(TESTPROGS): THISLIB = $(SUBDIR)$(LIBNAME)
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$(LIBOBJS): CPPFLAGS += -DBUILDING_$(NAME)
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$(TESTPROGS) $(TOOLS): %$(EXESUF): %.o
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$$(LD) $(LDFLAGS) $(LDEXEFLAGS) $$(LD_O) $$(filter %.o,$$^) $$(THISLIB) $(FFEXTRALIBS) $$(EXTRALIBS-$$(*F)) $$(ELIBS)
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$(SUBDIR)lib$(NAME).version: $(SUBDIR)version.h | $(SUBDIR)
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$$(M) $$(SRC_PATH)/ffbuild/libversion.sh $(NAME) $$< > $$@
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$(SUBDIR)lib$(FULLNAME).pc: $(SUBDIR)version.h ffbuild/config.sh | $(SUBDIR)
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$$(M) $$(SRC_PATH)/ffbuild/pkgconfig_generate.sh $(NAME) "$(DESC)"
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$(SUBDIR)lib$(NAME).ver: $(SUBDIR)lib$(NAME).v $(OBJS)
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$$(M)sed 's/MAJOR/$(lib$(NAME)_VERSION_MAJOR)/' $$< | $(VERSION_SCRIPT_POSTPROCESS_CMD) > $$@
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$(SUBDIR)$(SLIBNAME): $(SUBDIR)$(SLIBNAME_WITH_MAJOR)
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$(Q)cd ./$(SUBDIR) && $(LN_S) $(SLIBNAME_WITH_MAJOR) $(SLIBNAME)
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$(SUBDIR)$(SLIBNAME_WITH_MAJOR): $(OBJS) $(SHLIBOBJS) $(SLIBOBJS) $(SUBDIR)lib$(NAME).ver
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$(SLIB_CREATE_DEF_CMD)
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$$(LD) $(SHFLAGS) $(LDFLAGS) $(LDSOFLAGS) $$(LD_O) $$(filter %.o,$$^) $(FFEXTRALIBS)
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$(SLIB_EXTRA_CMD)
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ifdef SUBDIR
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$(SUBDIR)$(SLIBNAME_WITH_MAJOR): $(DEP_LIBS)
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endif
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clean::
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$(RM) $(addprefix $(SUBDIR),$(CLEANFILES) $(CLEANSUFFIXES) $(LIBSUFFIXES)) \
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$(CLEANSUFFIXES:%=$(SUBDIR)$(ARCH)/%) $(CLEANSUFFIXES:%=$(SUBDIR)tests/%)
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install-lib$(NAME)-shared: $(SUBDIR)$(SLIBNAME)
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$(Q)mkdir -p "$(SHLIBDIR)"
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$$(INSTALL) -m 755 $$< "$(SHLIBDIR)/$(SLIB_INSTALL_NAME)"
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$$(STRIP) "$(SHLIBDIR)/$(SLIB_INSTALL_NAME)"
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$(Q)$(foreach F,$(SLIB_INSTALL_LINKS),(cd "$(SHLIBDIR)" && $(LN_S) $(SLIB_INSTALL_NAME) $(F));)
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$(if $(SLIB_INSTALL_EXTRA_SHLIB),$$(INSTALL) -m 644 $(SLIB_INSTALL_EXTRA_SHLIB:%=$(SUBDIR)%) "$(SHLIBDIR)")
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$(if $(SLIB_INSTALL_EXTRA_LIB),$(Q)mkdir -p "$(LIBDIR)")
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$(if $(SLIB_INSTALL_EXTRA_LIB),$$(INSTALL) -m 644 $(SLIB_INSTALL_EXTRA_LIB:%=$(SUBDIR)%) "$(LIBDIR)")
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install-lib$(NAME)-static: $(SUBDIR)$(LIBNAME)
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$(Q)mkdir -p "$(LIBDIR)"
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$$(INSTALL) -m 644 $$< "$(LIBDIR)"
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$(LIB_INSTALL_EXTRA_CMD)
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install-lib$(NAME)-headers: $(addprefix $(SUBDIR),$(HEADERS) $(BUILT_HEADERS))
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$(Q)mkdir -p "$(INCINSTDIR)"
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$$(INSTALL) -m 644 $$^ "$(INCINSTDIR)"
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install-lib$(NAME)-pkgconfig: $(SUBDIR)lib$(FULLNAME).pc
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$(Q)mkdir -p "$(PKGCONFIGDIR)"
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$$(INSTALL) -m 644 $$^ "$(PKGCONFIGDIR)"
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uninstall-libs::
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-$(RM) "$(SHLIBDIR)/$(SLIBNAME_WITH_MAJOR)" \
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"$(SHLIBDIR)/$(SLIBNAME)" \
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"$(SHLIBDIR)/$(SLIBNAME_WITH_VERSION)"
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-$(RM) $(SLIB_INSTALL_EXTRA_SHLIB:%="$(SHLIBDIR)/%")
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-$(RM) $(SLIB_INSTALL_EXTRA_LIB:%="$(LIBDIR)/%")
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-$(RM) "$(LIBDIR)/$(LIBNAME)"
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uninstall-headers::
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$(RM) $(addprefix "$(INCINSTDIR)/",$(HEADERS) $(BUILT_HEADERS))
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-rmdir "$(INCINSTDIR)"
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uninstall-pkgconfig::
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$(RM) "$(PKGCONFIGDIR)/lib$(FULLNAME).pc"
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endef
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$(eval $(RULES))
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$(TOOLS): $(DEP_LIBS) $(SUBDIR)$($(CONFIG_SHARED:yes=S)LIBNAME)
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$(TESTPROGS): $(DEP_LIBS) $(SUBDIR)$(LIBNAME)
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testprogs: $(TESTPROGS)
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