build: add run-gdb target

Add make target 'run-gdb' that will automatically start gdb with
G_MESSAGES_DEBUG=all and G_DEBUG=fatal-criticals environment variables.

Makefile.am

@@ -142,6 +142,16 @@ git-source-dist:
 
 #-------------------------------------------------------------
 
+run-gdb: gdb-script install
+	gdb -x gdb-script
+
+.PHONY: run-gdb
+
+gdb-script: gdb-script.in
+	sed -e 's,[@]bindir[@],${bindir},g' < $< > $@
+
+#-------------------------------------------------------------
+
 GEN_FROM_VALA = $(filter %.vala,$(mconnect_SOURCES))
 BUILT_SOURCES = \
 	mconnect.desktop \

gdb-script.in

@@ -0,0 +1,4 @@
+set environment G_MESSAGES_DEBUG = all
+set environment G_DEBUG = fatal-criticals
+file @bindir@/mconnect
+run