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libs-list :=
ifeq ($(OS), Darwin)
SO_EXT = dylib
else
ifeq (CYGWIN,$(findstring CYGWIN,$(OS)))
SO_EXT = dll
else
SO_EXT = so
endif
endif
# Build a library with symbolic name $(1). The library is defined by
# various variables prefixed by ‘$(1)_’:
#
# - $(1)_NAME: the name of the library (e.g. ‘libfoo’); defaults to
# $(1).
#
# - $(1)_DIR: the directory where the (non-installed) library will be
# placed.
#
# - $(1)_SOURCES: the source files of the library.
#
# - $(1)_CFLAGS: additional C compiler flags.
#
# - $(1)_CXXFLAGS: additional C++ compiler flags.
#
# - $(1)_ORDER_AFTER: a set of targets on which the object files of
# this libraries will have an order-only dependency.
#
# - $(1)_LIBS: the symbolic names of other libraries on which this
# library depends.
#
# - $(1)_ALLOW_UNDEFINED: if set, the library is allowed to have
# undefined symbols. Has no effect for static libraries.
#
# - $(1)_LDFLAGS: additional linker flags.
#
# - $(1)_LDFLAGS_PROPAGATED: additional linker flags, also propagated
# to the linking of programs/libraries that use this library.
#
# - $(1)_FORCE_INSTALL: if defined, the library will be installed even
# if it's not needed (i.e. dynamically linked) by a program.
#
# - $(1)_INSTALL_DIR: the directory where the library will be
# installed. Defaults to $(libdir).
#
# - $(1)_EXCLUDE_FROM_LIBRARY_LIST: if defined, the library will not
# be automatically marked as a dependency of the top-level all
# target andwill not be listed in the make help output. This is
# useful for libraries built solely for testing, for example.
#
# - BUILD_SHARED_LIBS: if equal to ‘1’, a dynamic library will be
# built, otherwise a static library.
define build-library
$(1)_NAME ?= $(1)
_d := $(buildprefix)$$(strip $$($(1)_DIR))
_srcs := $$(sort $$(foreach src, $$($(1)_SOURCES), $$(src)))
$(1)_OBJS := $$(addprefix $(buildprefix), $$(addsuffix .o, $$(basename $$(_srcs))))
_libs := $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_PATH))
ifeq (CYGWIN,$(findstring CYGWIN,$(OS)))
$(1)_INSTALL_DIR ?= $$(bindir)
else
$(1)_INSTALL_DIR ?= $$(libdir)
endif
$(1)_LDFLAGS_USE :=
$(1)_LDFLAGS_USE_INSTALLED :=
$$(eval $$(call create-dir, $$(_d)))
ifeq ($(BUILD_SHARED_LIBS), 1)
ifdef $(1)_ALLOW_UNDEFINED
ifeq ($(OS), Darwin)
$(1)_LDFLAGS += -undefined suppress -flat_namespace
endif
else
ifneq ($(OS), Darwin)
ifneq (CYGWIN,$(findstring CYGWIN,$(OS)))
$(1)_LDFLAGS += -Wl,-z,defs
endif
endif
endif
ifneq ($(OS), Darwin)
$(1)_LDFLAGS += -Wl,-soname=$$($(1)_NAME).$(SO_EXT)
endif
$(1)_PATH := $$(_d)/$$($(1)_NAME).$(SO_EXT)
$$($(1)_PATH): $$($(1)_OBJS) $$(_libs) | $$(_d)/
$$(trace-ld) $(CXX) -o $$(abspath $$@) -shared $$(GLOBAL_LDFLAGS) $$($(1)_OBJS) $$($(1)_LDFLAGS) $$($(1)_LDFLAGS_PROPAGATED) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_LDFLAGS_USE)) $$($(1)_LDFLAGS_UNINSTALLED)
ifneq ($(OS), Darwin)
$(1)_LDFLAGS_USE += -Wl,-rpath,$$(abspath $$(_d))
endif
$(1)_LDFLAGS_USE += -L$$(_d) -l$$(patsubst lib%,%,$$(strip $$($(1)_NAME)))
$(1)_INSTALL_PATH := $(DESTDIR)$$($(1)_INSTALL_DIR)/$$($(1)_NAME).$(SO_EXT)
_libs_final := $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_INSTALL_PATH))
$$(eval $$(call create-dir, $$($(1)_INSTALL_DIR)))
$$($(1)_INSTALL_PATH): $$($(1)_OBJS) $$(_libs_final) | $(DESTDIR)$$($(1)_INSTALL_DIR)/
$$(trace-ld) $(CXX) -o $$@ -shared $$(GLOBAL_LDFLAGS) $$($(1)_OBJS) $$($(1)_LDFLAGS) $$($(1)_LDFLAGS_PROPAGATED) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_LDFLAGS_USE_INSTALLED))
$(1)_LDFLAGS_USE_INSTALLED += -L$$(DESTDIR)$$($(1)_INSTALL_DIR) -l$$(patsubst lib%,%,$$(strip $$($(1)_NAME)))
ifneq ($(OS), Darwin)
ifeq ($(SET_RPATH_TO_LIBS), 1)
$(1)_LDFLAGS_USE_INSTALLED += -Wl,-rpath,$$($(1)_INSTALL_DIR)
else
$(1)_LDFLAGS_USE_INSTALLED += -Wl,-rpath-link,$$($(1)_INSTALL_DIR)
endif
endif
ifdef $(1)_FORCE_INSTALL
install: $$($(1)_INSTALL_PATH)
endif
else
$(1)_PATH := $$(_d)/$$($(1)_NAME).a
$$($(1)_PATH): $$($(1)_OBJS) | $$(_d)/
$(trace-ar) $(AR) crs $$@ $$?
$(1)_LDFLAGS_USE += $$($(1)_PATH) $$($(1)_LDFLAGS)
$(1)_INSTALL_PATH := $$(libdir)/$$($(1)_NAME).a
endif
$(1)_LDFLAGS_USE += $$($(1)_LDFLAGS_PROPAGATED)
$(1)_LDFLAGS_USE_INSTALLED += $$($(1)_LDFLAGS_PROPAGATED)
# Propagate CFLAGS and CXXFLAGS to the individual object files.
$$(foreach obj, $$($(1)_OBJS), $$(eval $$(obj)_CFLAGS=$$($(1)_CFLAGS)))
$$(foreach obj, $$($(1)_OBJS), $$(eval $$(obj)_CXXFLAGS=$$($(1)_CXXFLAGS)))
# Make each object file depend on the common dependencies.
$$(foreach obj, $$($(1)_OBJS), $$(eval $$(obj): $$($(1)_COMMON_DEPS) $$(GLOBAL_COMMON_DEPS)))
# Make each object file have order-only dependencies on the common
# order-only dependencies. This includes the order-only dependencies
# of libraries we're depending on.
$(1)_ORDER_AFTER_CLOSED = $$($(1)_ORDER_AFTER) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_ORDER_AFTER_CLOSED))
$$(foreach obj, $$($(1)_OBJS), $$(eval $$(obj): | $$($(1)_ORDER_AFTER_CLOSED) $$(GLOBAL_ORDER_AFTER)))
# Include .dep files, if they exist.
$(1)_DEPS := $$(foreach fn, $$($(1)_OBJS), $$(call filename-to-dep, $$(fn)))
-include $$($(1)_DEPS)
ifndef $(1)_EXCLUDE_FROM_LIBRARY_LIST
libs-list += $$($(1)_PATH)
endif
clean-files += $$(_d)/*.a $$(_d)/*.$(SO_EXT) $$(_d)/*.o $$(_d)/.*.dep $$($(1)_DEPS) $$($(1)_OBJS)
dist-files += $$(_srcs)
endef
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