[Bug preprocessor/51341] make cannot detect head file change by dependency file with gcc 4.6.1 on ubuntu 11.10

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51341

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-11-29 15:26:29 UTC ---
(In reply to comment #3)
> I am a little confused. -MT will create .d file. Then make command will include
> .d and re-compile if dependency file changes. The issue is that g++ 4.6.1
> doesn't re-compile if I touch .h. Does this mean my test.d format is wrong? If

Did you read the linked bug report?  Did you look at the content of test.d?

> I need another -MT, what syntax it should be? Thanks a lot!

g++ -c -MMD -MP -MF"$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" "-MT$@" $< -o $@