Find out the reason, it's the gdb that makes the ghost, cygwin's new version of gdb (200607),
1. Enter Eclipse and select [Window] - [Preferences].
2、选择【C/C++】－【Debug】－【Common Source Lookup Source】。
3. Click [Add...] on the right and select [Path Mapping]. Then click the Path Mapping just added, [Edit...], then [Add...],
Fill in /cygdrive/c in Compilation path, and fill in c:/ in Local file system path;
Fill in /cygdrive/d in Compilation path and d:/ in Local file system path;
Fill in /cygdrive/e in Compilation path and e:/ in Local file system path;
……
The above mappings are added and added depending on the situation, depending on where your workspace is!