fix: incomplete dependency in makefile, now multithreading compilation is supported well

README.md

@@ -20,8 +20,9 @@ This system is really user-friendly and you can pick it up in several minutes. R
 
 - fork this repository in your github account
 
-Then you need to compile the project, just type `make` in the gStore root directory, then all executables will be generated.
-(For faster compiling speed, use `make -j4` instead)
+Then you need to compile the project, for the first time you need to type `make pre` to prepare the `ANTLR` library and some Lexer/Parser programs.
+Later you do not need to type this command again, just use the `make` command in the home directory of gStore, then all executables will be generated.
+(For faster compiling speed, use `make -j4` instead, using how many threads is up to your machine)
 To check the correctness of the program, please type `make test` command.
 
 The first strategy is suggested to get the source code because you can easily acquire the updates of the code by typing `git pull` in the home directory of gStore repository. 

makefile

@@ -523,7 +523,7 @@ test:
 	@bin/update_test > /dev/null
 
 clean:
-	rm -rf lib/libantlr.a
+	#rm -rf lib/libantlr.a
 	$(MAKE) -C api/socket/cpp/src clean
 	$(MAKE) -C api/socket/cpp/example clean
 	$(MAKE) -C api/socket/java/src clean
@@ -543,7 +543,6 @@ clean:
 dist: clean
 	rm -rf *.nt *.n3 .debug/*.log .tmp/*.dat *.txt *.db
 	rm -rf tools/libantlr3c-3.4 lib/libantlr.a Parser/Sparql*
-	#rm -rf Parser/SparqlLexer* Parser/SparlParser.cpp
 	rm -rf cscope* .cproject .settings tags
 	rm -rf *.info
 	rm -rf backups/*.db