During sequential compilation, the file y.tab.c is generated by yacc (where y.tab.c is the default filename) for parserl and then parser2; but in parallel mode, this results in a conflict.
在有序编译期间，yacc(其中y.t ab . c是默认文件名)为parserl生成文件y.t ab . c，然后为parser 2生成文件y.t ab . c；但在并行模式下，这会导致冲突。