Enable use of 'check_abi' in build system

This patch invokes the 'check_abi' tool for each shared library that
implements an ABI.

Issue #2639

repos/base/lib/mk/ld-platform.inc

@@ -13,6 +13,9 @@ INC_DIR     += $(DIR)/include
 INC_DIR     += $(BASE_DIR)/src/include
 LD_OPT      += -Bsymbolic-functions --version-script=symbol.map
 
+# enable use of 'check_abi'
+SYMBOLS := $(BASE_DIR)/lib/symbols/ld
+
 #
 # Generate symbol map from the ABI
 #

repos/base/mk/lib.mk

@@ -138,6 +138,17 @@ else
 LIB_A := $(addsuffix .lib.a,$(LIB))
 endif
 
+#
+# Whenever an ABI is defined for a shared library, we check the consistency
+# between both by invoking the 'check_abi' tool via the 'LIB_CHECKED'
+# dependency.
+#
+ifneq ($(LIB_SO),)
+ ifneq ($(ABI_SO),)
+  LIB_CHECKED := $(addsuffix .lib.checked,$(LIB))
+ endif
+endif
+
 #
 # Trigger the creation of the <libname>.lib.a or <libname>.lib.so file
 #
@@ -153,7 +164,7 @@ all: $(LIB_TAG)
 #
 $(LIB_TAG) $(OBJECTS): $(HOST_TOOLS)
 
-$(LIB_TAG): $(LIB_A) $(LIB_SO) $(ABI_SO) $(INSTALL_SO) $(DEBUG_SO)
+$(LIB_TAG): $(LIB_A) $(LIB_SO) $(LIB_CHECKED) $(ABI_SO) $(INSTALL_SO) $(DEBUG_SO)
 	@touch $@
 
 #
@@ -248,6 +259,9 @@ $(ABI_SO): $(LIB).symbols.o
 	                $(LIB_SO_DEPS) $< \
 	                --end-group --no-whole-archive
 
+$(LIB_CHECKED): $(LIB_SO)
+	$(VERBOSE)$(BASE_DIR)/../../tool/check_abi $(LIB_SO) $(SYMBOLS)
+
 $(LIB_SO).stripped: $(LIB_SO)
 	$(VERBOSE)$(STRIP) -o $@ $<