src/build/toolchain/mac/filter_libtool.py is apparently what does this nowadays (in the gn world)

Actually, that looks like a legit warning. fbarchard, is it expected that libvpx/libvpx_intrinsics_sse2/loopfilter_sse2.o and libvpx/libvpx_yasm/loopfilter_sse2.o both get linked in to the same binary? Probably not?

Looks like a legit bug, but I dont work on vpx directly.  James?

One is from vp8 and the other from vp9 (via vpx_dsp), the intrinsics file should be renamed. There's a duplicate basename check in the generator script, but it's only looking at .c files. Maybe it assumed .asm's would end up with a unique suffix, Johann?

Apparently this came up before in #628661. Renaming the file is OK, not sure if gn should retain the file suffix to help avoid cases like this elsewhere.

oops, bad use of linkification ->  crbug.com/628661 .

Turns out this warning is printed a brazilion times, so we need to just filter it out.  If it's expected that these 2 specific files are both in the build, then just ignore this.  Looked unexpected to me, but apparently my intuition was wrong.

All right, if you want to handle it that way we can leave it as is. Thanks for the update.

 Issue 650862  has been merged into this issue.