make clean does not remove obsolete filter from filter_list.c

[Ulf Zibis]

Summary of the bug:
How to reproduce:

• Create a new filter and add it to libavfilter/Makefile.
• Build the project --> success.
• Remove the new filter and delete it from libavfilter/Makefile.
• Clean and build the project --> error: vf_newfilter.c in filter_list.c not declared.

[Elon Musk]

This is not help channel for developing ffmpeg.

[Ulf Zibis]

Hi,
this is not a help request, but a real bug report.

I followed doc/writing_filters.txt to create a new filter foobar.c.
Then I did:

• ./configure
• make
• rm libavfilter/vf_foobar.c
• delete foobar entry in libavfilter/MAKEFILE
• delete foobar entry in libavfilter/allfilters.c
• make clean
• make

Result:

[....]
CC	libavfilter/allfilters.o
In file included from libavfilter/allfilters.c:461:0:
./libavfilter/filter_list.c:169:6: error: ‘ff_vf_foobar’ undeclared here (not in a function); did you mean ‘ff_vf_format’?
     &ff_vf_foobar,
      ^~~~~~~~~~~~
      ff_vf_format
ffbuild/common.mak:60: recipe for target 'libavfilter/allfilters.o' failed
make: *** [libavfilter/allfilters.o] Error 1

Workaround before ./configure is:

• rm libavfilter/filter_list.c

[Elon Musk]

Can not reproduce.