1 files changed, 97 insertions, 0 deletions
diff --git a/mk/libraries.mk b/mk/libraries.mk
new file mode 100644
index 000000000000..58c67063be5e
--- /dev/null
+++ b/mk/libraries.mk
@@ -0,0 +1,97 @@
+libs_list :=
+
+# 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 containing the sources of the library, and
+#   where the (non-installed) library will be placed.
+#
+# - $(1)_SOURCES: the source files of the library.
+#
+# - $(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).
+#
+# - BUILD_SHARED_LIBS: if equal to ‘1’, a dynamic library will be
+#   built, otherwise a static library.
+define build-library =
+  $(1)_NAME ?= $(1)
+  _d := $$(strip $$($(1)_DIR))
+  _srcs := $$(foreach src, $$($(1)_SOURCES), $$(_d)/$$(src))
+  $(1)_OBJS := $$(addsuffix .o, $$(basename $$(_srcs)))
+  _libs := $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_PATH))
+
+  $(1)_INSTALL_DIR ?= $$(libdir)
+
+  $(1)_LDFLAGS_USE :=
+  $(1)_LDFLAGS_USE_INSTALLED :=
+
+  ifeq ($(BUILD_SHARED_LIBS), 1)
+
+    ifndef $(1)_ALLOW_UNDEFINED
+      $(1)_LDFLAGS += -z defs
+    endif
+
+    $(1)_PATH := $$(_d)/$$($(1)_NAME).so
+
+    $$($(1)_PATH): $$($(1)_OBJS) $$(_libs)
+	$(QUIET) $(CXX) -o $$@ -shared $(GLOBAL_LDFLAGS) $$($(1)_OBJS) $$($(1)_LDFLAGS) $$($(1)_LDFLAGS_PROPAGATED) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_LDFLAGS_USE))
+
+    $(1)_LDFLAGS_USE += -L$$(_d) -Wl,-rpath,$$(abspath $$(_d)) -l$$(patsubst lib%,%,$$(strip $$($(1)_NAME)))
+
+    $(1)_INSTALL_PATH := $$($(1)_INSTALL_DIR)/$$($(1)_NAME).so
+
+    _libs_final := $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_INSTALL_PATH))
+
+    $$(eval $$(call create-dir,$$($(1)_INSTALL_DIR)))
+
+    $$($(1)_INSTALL_PATH): $$($(1)_OBJS) $$(_libs_final) | $$($(1)_INSTALL_DIR)
+	$(QUIET) $(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$$($(1)_INSTALL_DIR) -Wl,-rpath,$$($(1)_INSTALL_DIR) -l$$(patsubst lib%,%,$$(strip $$($(1)_NAME)))
+
+    ifdef $(1)_FORCE_INSTALL
+      install: $$($(1)_INSTALL_PATH)
+    endif
+
+  else
+
+    $(1)_PATH := $$(_d)/$$($(1)_NAME).a
+
+    $$($(1)_PATH): $$($(1)_OBJS)
+	$(QUIET) 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 CXXFLAGS to the individual object files.
+  $$(foreach obj, $$($(1)_OBJS), $$(eval $$(obj)_CXXFLAGS=$$($(1)_CXXFLAGS)))
+
+  include $$(wildcard $$(_d)/*.dep)
+
+  libs_list += $$($(1)_PATH)
+  clean_files += $$(_d)/*.a $$(_d)/*.so $$(_d)/*.o $$(_d)/*.dep
+  dist_files += $$(_srcs)
+endef