build: move private symbols into a convenience library

Since 99eb6a3 we no longer export any
private symbols. The tests do require those private symbols though.
Instead of compiling the source twice, as done in
f415452, create a convenience library
and link the tests against it.

Makefile.am

@@ -3,7 +3,8 @@ EXTRA_DIST = README.html
 
 SUBDIRS = . tests
 
-lib_LTLIBRARIES = libfastjson.la 
+lib_LTLIBRARIES = libfastjson.la
+noinst_LTLIBRARIES = libfastjson-internal.la
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = libfastjson.pc
@@ -29,20 +30,22 @@ libfastjson_la_LDFLAGS = \
 	-export-symbols-regex '^fjson_.*' \
 	-no-undefined \
 	@JSON_BSYMBOLIC_LDFLAGS@
+libfastjson_la_LIBADD = libfastjson-internal.la
 
 libfastjson_la_SOURCES = \
-	arraylist.c \
-	debug.c \
 	json_version.c \
 	json_object.c \
 	json_object_iterator.c \
 	json_tokener.c \
-	json_util.c \
+	json_util.c
+
+libfastjson_internal_la_SOURCES = \
+	arraylist.c \
+	debug.c \
 	linkhash.c \
 	printbuf.c \
 	random_seed.c
 
-
 uninstall-local:
 	rm -rf "$(DESTDIR)@includedir@/libfastjson"
 

tests/Makefile.am

@@ -1,7 +1,6 @@
 
-LDADD= $(LIBJSON_LA)
-
-LIBJSON_LA=$(top_builddir)/libfastjson.la
+LDADD = $(top_builddir)/libfastjson.la \
+        $(top_builddir)/libfastjson-internal.la
 
 TESTS=
 TESTS+= test1.test
@@ -29,8 +28,8 @@ TESTS += chk_version
 check_PROGRAMS += chk_version
 chk_version_SOURCES = chk_version.c
 
-test_printbuf_SOURCES = test_printbuf.c ../printbuf.c ../debug.c
-test_set_serializer_SOURCES = test_set_serializer.c ../printbuf.c
+test_printbuf_SOURCES = test_printbuf.c
+test_set_serializer_SOURCES = test_set_serializer.c
 
 # Note: handled by test1.test
 check_PROGRAMS += test1Formatted