mirror of
https://git.notmuchmail.org/git/notmuch
synced 2024-11-22 10:58:10 +01:00
bc11759dd1
The dynamic generation of the linker version script for libnotmuch
exports has grown rather complicated.
Reverse the visibility control by hiding symbols by default using
-fvisibility=hidden, and explicitly exporting symbols in notmuch.h
using #pragma GCC visibility. (We could also use __attribute__
((visibility ("default"))) for each exported function, but the pragma
is more convenient.)
The above is not quite enough alone, as it would "leak" a number of
weak symbols from Xapian and C++ standard library. Combine it with a
small static version script that filters out everything except the
notmuch_* symbols that we explicitly exposed, and the C++ RTTI
typeinfo symbols for exception handling.
Finally, as the symbol hiding test can no longer look at the generated
symbol table, switch the test to parse the functions from notmuch.h.
88 lines
3 KiB
Makefile
88 lines
3 KiB
Makefile
# -*- makefile -*-
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dir := lib
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# The (often-reused) $dir works fine within targets/prerequisites,
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# but cannot be used reliably within commands, so copy its value to a
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# variable that is not reused.
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lib := $(dir)
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ifeq ($(PLATFORM),MACOSX)
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LIBRARY_SUFFIX = dylib
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# On OS X, library version numbers go before suffix.
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LINKER_NAME = libnotmuch.$(LIBRARY_SUFFIX)
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SONAME = libnotmuch.$(LIBNOTMUCH_VERSION_MAJOR).$(LIBRARY_SUFFIX)
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LIBNAME = libnotmuch.$(LIBNOTMUCH_VERSION_MAJOR).$(LIBNOTMUCH_VERSION_MINOR).$(LIBNOTMUCH_VERSION_RELEASE).$(LIBRARY_SUFFIX)
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LIBRARY_LINK_FLAG = -dynamiclib -install_name $(libdir)/$(SONAME) -compatibility_version $(LIBNOTMUCH_VERSION_MAJOR).$(LIBNOTMUCH_VERSION_MINOR) -current_version $(LIBNOTMUCH_VERSION_MAJOR).$(LIBNOTMUCH_VERSION_MINOR).$(LIBNOTMUCH_VERSION_RELEASE)
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else
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LIBRARY_SUFFIX = so
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LINKER_NAME = libnotmuch.$(LIBRARY_SUFFIX)
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SONAME = $(LINKER_NAME).$(LIBNOTMUCH_VERSION_MAJOR)
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LIBNAME = $(SONAME).$(LIBNOTMUCH_VERSION_MINOR).$(LIBNOTMUCH_VERSION_RELEASE)
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LIBRARY_LINK_FLAG = -shared -Wl,--version-script=$(lib)/notmuch.sym,-soname=$(SONAME) $(NO_UNDEFINED_LDFLAGS)
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ifeq ($(PLATFORM),OPENBSD)
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LIBRARY_LINK_FLAG += -lc
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endif
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ifeq ($(LIBDIR_IN_LDCONFIG),1)
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ifeq ($(DESTDIR),)
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LIBRARY_INSTALL_POST_COMMAND=ldconfig
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endif
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endif
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endif
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extra_cflags += -I$(srcdir)/$(dir) -fPIC -fvisibility=hidden
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extra_cxxflags += -fvisibility-inlines-hidden
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libnotmuch_c_srcs = \
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$(notmuch_compat_srcs) \
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$(dir)/filenames.c \
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$(dir)/string-list.c \
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$(dir)/message-file.c \
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$(dir)/messages.c \
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$(dir)/sha1.c \
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$(dir)/built-with.c \
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$(dir)/string-map.c \
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$(dir)/tags.c
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libnotmuch_cxx_srcs = \
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$(dir)/database.cc \
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$(dir)/parse-time-vrp.cc \
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$(dir)/directory.cc \
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$(dir)/index.cc \
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$(dir)/message.cc \
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$(dir)/message-property.cc \
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$(dir)/query.cc \
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$(dir)/query-fp.cc \
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$(dir)/config.cc \
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$(dir)/regexp-fields.cc \
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$(dir)/thread.cc
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libnotmuch_modules := $(libnotmuch_c_srcs:.c=.o) $(libnotmuch_cxx_srcs:.cc=.o)
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$(dir)/libnotmuch.a: $(libnotmuch_modules)
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$(call quiet,AR) rcs $@ $^
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$(dir)/$(LIBNAME): $(libnotmuch_modules) util/libnotmuch_util.a parse-time-string/libparse-time-string.a
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$(call quiet,CXX $(CXXFLAGS)) $(libnotmuch_modules) $(FINAL_LIBNOTMUCH_LDFLAGS) $(LIBRARY_LINK_FLAG) -o $@ util/libnotmuch_util.a parse-time-string/libparse-time-string.a
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$(dir)/$(SONAME): $(dir)/$(LIBNAME)
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ln -sf $(LIBNAME) $@
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$(dir)/$(LINKER_NAME): $(dir)/$(SONAME)
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ln -sf $(LIBNAME) $@
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install: install-$(dir)
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install-$(dir): $(dir)/$(LIBNAME)
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mkdir -p "$(DESTDIR)$(libdir)/"
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install -m0644 "$(lib)/$(LIBNAME)" "$(DESTDIR)$(libdir)/"
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ln -sf $(LIBNAME) "$(DESTDIR)$(libdir)/$(SONAME)"
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ln -sf $(LIBNAME) "$(DESTDIR)$(libdir)/$(LINKER_NAME)"
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mkdir -p "$(DESTDIR)$(includedir)"
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install -m0644 "$(srcdir)/$(lib)/notmuch.h" "$(DESTDIR)$(includedir)/"
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$(LIBRARY_INSTALL_POST_COMMAND)
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SRCS := $(SRCS) $(libnotmuch_c_srcs) $(libnotmuch_cxx_srcs)
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CLEAN += $(libnotmuch_modules) $(dir)/$(SONAME) $(dir)/$(LINKER_NAME)
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CLEAN += $(dir)/$(LIBNAME) $(dir)/libnotmuch.a
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CLEAN += $(dir)/notmuch.h.gch
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