gcc -w -c espresso.h
2021/12/29 23:07 18,915 espresso.h
2021/12/29 23:12 1,561,284 espresso.h.gch
To create a precompiled header file, simply compile it as you would any other file, if necessary using the -x option to make the driver treat it as a C or C++ header file. You may want to use a tool like make to keep the precompiled header up-to-date when the headers it contains change.
-x <语言> 指定其后输入文件的语言。 允许的语言包括：c、c++、assembler、none ‘none’意味着恢复默认行为，即根据文件的扩展名猜测源文件的语言。
-w 关闭所有警告 小写的w
Precompiled Headers (Using the GNU Compiler Collection (GCC))