LTO does not work with --enable-opencl

[Oneric]

Summary of the bug:

When building with --enable-opencl --enable-lto the build fails on current git master bfa1b7577dd646e84acafd0c82a8c2c6fe9c2a0a.
It used to work in the past, I haven’t kept record of each time it worked but at least up until feeeefc3db04810286cd647f235ced0ec6c3eba8 it still worked (also built with gcc 12).
Changing --enable-opencl for --disable-opencl results in a successful build.

Full config:

% gcc --version
gcc (Debian 12.2.0-14) 12.2.0

% ./configure --enable-lto --cc=gcc --ld=gcc --samples=fate-suite --disable-shared --enable-static --enable-opencl

Full error log:

/usr/bin/ld: /tmp/ccx7sf4o.ltrans4.ltrans.o: in function `avgblur_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_avgblur_opencl.c:62: undefined reference to `ff_source_avgblur_cl'
/usr/bin/ld: /tmp/ccx7sf4o.ltrans6.ltrans.o: in function `filter_frame.lto_priv.32':
./ffmpeg/libavfilter/vf_colorkey_opencl.c:53: undefined reference to `ff_source_colorkey_cl'
/usr/bin/ld: /tmp/ccx7sf4o.ltrans6.ltrans.o: in function `convolution_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_convolution_opencl.c:65: undefined reference to `ff_source_convolution_cl'
/usr/bin/ld: /tmp/ccx7sf4o.ltrans12.ltrans.o: in function `neighbor_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_neighbor_opencl.c:58: undefined reference to `ff_source_neighbor_cl'
/usr/bin/ld: /tmp/ccx7sf4o.ltrans12.ltrans.o: in function `overlay_opencl_blend':
./ffmpeg/libavfilter/vf_overlay_opencl.c:54: undefined reference to `ff_source_overlay_cl'
/usr/bin/ld: /tmp/ccx7sf4o.ltrans12.ltrans.o: in function `nlmeans_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_nlmeans_opencl.c:101: undefined reference to `ff_source_nlmeans_cl'
/usr/bin/ld: /tmp/ccx7sf4o.ltrans13.ltrans.o: in function `filter_frame.lto_priv.95':
./ffmpeg/libavfilter/vf_pad_opencl.c:95: undefined reference to `ff_source_pad_cl'
/usr/bin/ld: /tmp/ccx7sf4o.ltrans15.ltrans.o: in function `tonemap_opencl_init':
./ffmpeg/libavfilter/vf_tonemap_opencl.c:243: undefined reference to `ff_source_tonemap_cl'
/usr/bin/ld: ./ffmpeg/libavfilter/vf_tonemap_opencl.c:244: undefined reference to `ff_source_colorspace_common_cl'
/usr/bin/ld: /tmp/ccx7sf4o.ltrans15.ltrans.o: in function `transpose_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_transpose_opencl.c:47: undefined reference to `ff_source_transpose_cl'
/usr/bin/ld: /tmp/ccx7sf4o.ltrans15.ltrans.o: in function `unsharp_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_unsharp_opencl.c:72: undefined reference to `ff_source_unsharp_cl'
/usr/bin/ld: /tmp/ccx7sf4o.ltrans17.ltrans.o: in function `xfade_opencl_activate.lto_priv.0':
./ffmpeg/libavfilter/vf_xfade_opencl.c:96: undefined reference to `ff_source_xfade_cl'
collect2: error: ld returned 1 exit status
make: *** [Makefile:133: ffprobe_g] Error 1
make: *** Waiting for unfinished jobs....
/usr/bin/ld: /tmp/ccSOwh70.ltrans3.ltrans.o: in function `avgblur_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_avgblur_opencl.c:62: undefined reference to `ff_source_avgblur_cl'
/usr/bin/ld: /tmp/ccSOwh70.ltrans5.ltrans.o: in function `filter_frame.lto_priv.32':
./ffmpeg/libavfilter/vf_colorkey_opencl.c:53: undefined reference to `ff_source_colorkey_cl'
/usr/bin/ld: /tmp/ccSOwh70.ltrans5.ltrans.o: in function `convolution_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_convolution_opencl.c:65: undefined reference to `ff_source_convolution_cl'
/usr/bin/ld: /tmp/ccSOwh70.ltrans11.ltrans.o: in function `neighbor_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_neighbor_opencl.c:58: undefined reference to `ff_source_neighbor_cl'
/usr/bin/ld: /tmp/ccSOwh70.ltrans11.ltrans.o: in function `nlmeans_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_nlmeans_opencl.c:101: undefined reference to `ff_source_nlmeans_cl'
/usr/bin/ld: /tmp/ccSOwh70.ltrans12.ltrans.o: in function `overlay_opencl_blend':
./ffmpeg/libavfilter/vf_overlay_opencl.c:54: undefined reference to `ff_source_overlay_cl'
/usr/bin/ld: /tmp/ccSOwh70.ltrans12.ltrans.o: in function `filter_frame.lto_priv.95':
./ffmpeg/libavfilter/vf_pad_opencl.c:95: undefined reference to `ff_source_pad_cl'
/usr/bin/ld: /tmp/ccSOwh70.ltrans14.ltrans.o: in function `tonemap_opencl_init':
./ffmpeg/libavfilter/vf_tonemap_opencl.c:243: undefined reference to `ff_source_tonemap_cl'
/usr/bin/ld: ./ffmpeg/libavfilter/vf_tonemap_opencl.c:244: undefined reference to `ff_source_colorspace_common_cl'
/usr/bin/ld: /tmp/ccSOwh70.ltrans14.ltrans.o: in function `transpose_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_transpose_opencl.c:47: undefined reference to `ff_source_transpose_cl'
/usr/bin/ld: /tmp/ccSOwh70.ltrans14.ltrans.o: in function `unsharp_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_unsharp_opencl.c:72: undefined reference to `ff_source_unsharp_cl'
/usr/bin/ld: /tmp/ccSOwh70.ltrans16.ltrans.o: in function `xfade_opencl_activate.lto_priv.0':
./ffmpeg/libavfilter/vf_xfade_opencl.c:96: undefined reference to `ff_source_xfade_cl'
collect2: error: ld returned 1 exit status
make: *** [Makefile:133: ffplay_g] Error 1
/usr/bin/ld: /tmp/ccqEzyPi.ltrans5.ltrans.o: in function `avgblur_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_avgblur_opencl.c:62: undefined reference to `ff_source_avgblur_cl'
/usr/bin/ld: /tmp/ccqEzyPi.ltrans7.ltrans.o: in function `filter_frame.lto_priv.32':
./ffmpeg/libavfilter/vf_colorkey_opencl.c:53: undefined reference to `ff_source_colorkey_cl'
/usr/bin/ld: /tmp/ccqEzyPi.ltrans7.ltrans.o: in function `convolution_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_convolution_opencl.c:65: undefined reference to `ff_source_convolution_cl'
/usr/bin/ld: /tmp/ccqEzyPi.ltrans13.ltrans.o: in function `neighbor_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_neighbor_opencl.c:58: undefined reference to `ff_source_neighbor_cl'
/usr/bin/ld: /tmp/ccqEzyPi.ltrans13.ltrans.o: in function `overlay_opencl_blend':
./ffmpeg/libavfilter/vf_overlay_opencl.c:54: undefined reference to `ff_source_overlay_cl'
/usr/bin/ld: /tmp/ccqEzyPi.ltrans13.ltrans.o: in function `nlmeans_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_nlmeans_opencl.c:101: undefined reference to `ff_source_nlmeans_cl'
/usr/bin/ld: /tmp/ccqEzyPi.ltrans14.ltrans.o: in function `filter_frame.lto_priv.95':
./ffmpeg/libavfilter/vf_pad_opencl.c:95: undefined reference to `ff_source_pad_cl'
/usr/bin/ld: /tmp/ccqEzyPi.ltrans16.ltrans.o: in function `tonemap_opencl_init':
./ffmpeg/libavfilter/vf_tonemap_opencl.c:243: undefined reference to `ff_source_tonemap_cl'
/usr/bin/ld: ./ffmpeg/libavfilter/vf_tonemap_opencl.c:244: undefined reference to `ff_source_colorspace_common_cl'
/usr/bin/ld: /tmp/ccqEzyPi.ltrans16.ltrans.o: in function `transpose_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_transpose_opencl.c:47: undefined reference to `ff_source_transpose_cl'
/usr/bin/ld: /tmp/ccqEzyPi.ltrans16.ltrans.o: in function `unsharp_opencl_filter_frame.lto_priv.0':
./ffmpeg/libavfilter/vf_unsharp_opencl.c:72: undefined reference to `ff_source_unsharp_cl'
/usr/bin/ld: /tmp/ccqEzyPi.ltrans18.ltrans.o: in function `xfade_opencl_activate.lto_priv.0':
./ffmpeg/libavfilter/vf_xfade_opencl.c:96: undefined reference to `ff_source_xfade_cl'
collect2: error: ld returned 1 exit status

Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.