makefile中「mv」和「-mv」shell命令有什麼區別？

Question

我偶然發現一個人在一個makefile目標中改變mv命令到-mv。有什麼不同？

%/install-stamp:                           
     dh_testdir                           
     dh_testroot                           
     dh_prep -p$(subst _,-,$(a))-toolchain                      
     cp -rl $(r) debian/$(subst _,-,$(a))-toolchain                  
     -mv debian/$(subst _,-,$(a))-toolchain/usr/bin/libgcc_s_sjlj-1.dll debian/$(subst _,-,$(a))-toolchain/usr/$(subst \ 
_,-,$(a))/bin                            
     -mv debian/$(subst _,-,$(a))-toolchain/usr/lib/libiberty.a debian/$(subst _,-,$(a))-toolchain/usr/$(subst _,-,$(a)\ 
)/lib                              
     rm -f debian/$(subst _,-,$(a))-toolchain/usr/share/man/man1/dllwrap*            
     rm -f debian/$(subst _,-,$(a))-toolchain/usr/share/man/man7/fsf-funding*           
     rm -f debian/$(subst _,-,$(a))-toolchain/usr/share/man/man7/gfdl*             
     rm -f debian/$(subst _,-,$(a))-toolchain/usr/share/man/man7/gpl*             
     touch $(@)  

Answer 1

如果命令返回非零狀態，則在Makefile中的任何命令之前添加一個「 - 」指示make不會退出。基本上它是「我不在乎它是否失敗」。