Fix a bug where ct-* targets produced an empty GEN line

$ must be escaped as $$ in templates.

core/core.mk

@@ -55,6 +55,10 @@ gen_verbose_0 = @echo " GEN   " $@;
 gen_verbose_2 = set -x;
 gen_verbose = $(gen_verbose_$(V))
 
+gen_verbose_esc_0 = @echo " GEN   " $$@;
+gen_verbose_esc_2 = set -x;
+gen_verbose_esc = $(gen_verbose_esc_$(V))
+
 # Temporary files directory.
 
 ERLANG_MK_TMP ?= $(CURDIR)/.erlang.mk

plugins/ct.mk

@@ -80,7 +80,7 @@ endif
 define ct_suite_target
 ct-$(1): test-build
 	$(verbose) mkdir -p $(CT_LOGS_DIR)
-	$(gen_verbose) $(CT_RUN) -sname ct_$(PROJECT) -suite $(addsuffix _SUITE,$(1)) $(CT_EXTRA) $(CT_OPTS)
+	$(gen_verbose_esc) $(CT_RUN) -sname ct_$(PROJECT) -suite $(addsuffix _SUITE,$(1)) $(CT_EXTRA) $(CT_OPTS)
 endef
 
 $(foreach test,$(CT_SUITES),$(eval $(call ct_suite_target,$(test))))