build-sys: add coverage

Makefile.am

@@ -26,3 +26,5 @@ pkgconfig_DATA = virglrenderer.pc
 
 EXTRA_DIST = \
 	virglrenderer.pc.in
+
+@CODE_COVERAGE_RULES@

configure.ac

@@ -22,6 +22,7 @@ m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 AC_DISABLE_STATIC
 AC_PROG_LIBTOOL
 AC_SYS_LARGEFILE
+AX_CODE_COVERAGE
 
 AC_ARG_ENABLE(tests,
 	      AS_HELP_STRING([--enable-tests], [Build the tests (default=auto)]),

src/Makefile.am

@@ -1,5 +1,8 @@
 SUBDIRS := gallium/auxiliary
-AM_LDFLAGS = $(EPOXY_LIBS) $(GL_LIBS) -lgbm -lm -ldl -I./gallium/include
+AM_LDFLAGS = -lgbm -lm -ldl -I./gallium/include \
+	$(EPOXY_LIBS) \
+	$(GL_LIBS) \
+	$(CODE_COVERAGE_LDFLAGS)
 
 AM_CFLAGS = \
         -I$(top_srcdir)/src/gallium/drivers/virgl \
@@ -11,7 +14,8 @@ AM_CFLAGS = \
 	$(PIC_FLAGS) \
 	$(LIBDRM_CFLAGS) \
 	$(EPOXY_CFLAGS) \
-	$(VISIBILITY_CFLAGS)
+	$(VISIBILITY_CFLAGS) \
+	$(CODE_COVERAGE_CFLAGS)
 
 libvrend_la_SOURCES = \
         vrend_renderer.c \