We don't match fontmake for the test file WghtVar_Anchors.glyphs

[rsheeter]

$ python resources/scripts/ttx_diff.py --compare default resources/testdata/glyphs3/WghtVar_Anchors.glyphs
COMPARISON
  Only fontmake produced 'MVAR'
  Identical 'GDEF'
  Identical 'GPOS'
  Identical 'GlyphOrder'
  Identical 'HVAR'
  DIFF 'OS_2', build/default/fontc.OS_2.ttx build/default/fontmake.OS_2.ttx
  Identical 'STAT'
  Identical 'cmap'
  Identical 'fvar'
  DIFF 'glyf', build/default/fontc.glyf.ttx build/default/fontmake.glyf.ttx
  DIFF 'gvar', build/default/fontc.gvar.ttx build/default/fontmake.gvar.ttx
  DIFF 'head', build/default/fontc.head.ttx build/default/fontmake.head.ttx
  DIFF 'hhea', build/default/fontc.hhea.ttx build/default/fontmake.hhea.ttx
  DIFF 'hmtx', build/default/fontc.hmtx.ttx build/default/fontmake.hmtx.ttx
  Identical 'loca'
  Identical 'maxp'
  Identical 'name'
  Identical 'post'

Rather more diffs than one might have expected.

[anthrotype]

I don't get the same output as yours...
I checked out the PR branch #492 "back_when_mark_was_marky_mark" at the latest commit 01ad09c, then run the following command:

$ rm -rf build && python resources/scripts/ttx_diff.py resources/testdata/glyphs3/WghtVar_Anchors.glyphs
Compare default in build/default
  (cd build/default && cargo run -p fontc -- --no-production-names --source /usr/local/google/home/clupo/oss/fontc/resources/testdata/glyphs3/WghtVar_Anchors.glyphs --build-dir . > fontc.log 2>&1)
  (cd build/default && ttx -o font.ttx font.ttf > ttx.log 2>&1)
  (cd build/default && fontmake -o variable --output-dir WghtVar_Anchors.glyphs --drop-implied-oncurves --no-production-names --debug-feature-file debug.fea /usr/local/google/home/clupo/oss/fontc/resources/testdata/glyphs3/WghtVar_Anchors.glyphs > fontmake.log 2>&1)
  (cd build/default/WghtVar_Anchors.glyphs && ttx -o WghtVar_Anchors-VF.ttx WghtVar_Anchors-VF.ttf > ttx.log 2>&1)
TTX FILES
  fontc     build/default/fontc.ttx
  fontmake  build/default/fontmake.ttx
COMPARISON
  Only fontmake produced 'MVAR'
  Identical 'GDEF'
  Identical 'GPOS'
  Identical 'GlyphOrder'
  Identical 'HVAR'
  DIFF 'OS_2', build/default/fontc.OS_2.ttx build/default/fontmake.OS_2.ttx
  Identical 'STAT'
  Identical 'cmap'
  Identical 'fvar'
  Identical 'glyf'
  Identical 'gvar'
  DIFF 'head', build/default/fontc.head.ttx build/default/fontmake.head.ttx
  Identical 'hhea'
  Identical 'hmtx'
  Identical 'loca'
  Identical 'maxp'
  Identical 'name'
  Identical 'post'
Compare gftools in build/gftools
  (cd build/gftools && cargo run -p fontc -- --no-production-names --source /usr/local/google/home/clupo/oss/fontc/resources/testdata/glyphs3/WghtVar_Anchors.glyphs --build-dir . --flatten-components --decompose-transformed-components > fontc.log 2>&1)
  (cd build/gftools && ttx -o font.ttx font.ttf > ttx.log 2>&1)
  (cd build/gftools && fontmake -o variable --output-dir WghtVar_Anchors.glyphs --drop-implied-oncurves --no-production-names --debug-feature-file debug.fea --filter FlattenComponentsFilter --filter DecomposeTransformedComponentsFilter /usr/local/google/home/clupo/oss/fontc/resources/testdata/glyphs3/WghtVar_Anchors.glyphs > fontmake.log 2>&1)
  (cd build/gftools/WghtVar_Anchors.glyphs && ttx -o WghtVar_Anchors-VF.ttx WghtVar_Anchors-VF.ttf > ttx.log 2>&1)
TTX FILES
  fontc     build/gftools/fontc.ttx
  fontmake  build/gftools/fontmake.ttx
COMPARISON
  Only fontmake produced 'MVAR'
  Identical 'GDEF'
  Identical 'GPOS'
  Identical 'GlyphOrder'
  Identical 'HVAR'
  DIFF 'OS_2', build/gftools/fontc.OS_2.ttx build/gftools/fontmake.OS_2.ttx
  Identical 'STAT'
  Identical 'cmap'
  Identical 'fvar'
  Identical 'glyf'
  Identical 'gvar'
  DIFF 'head', build/gftools/fontc.head.ttx build/gftools/fontmake.head.ttx
  Identical 'hhea'
  Identical 'hmtx'
  Identical 'loca'
  Identical 'maxp'
  Identical 'name'
  Identical 'post'

This is inside a venv which which was initialised using resources/scripts/requirements.txt, which has fontmake pinned as 3.7.1. My fonttools is 4.43.1 (latest).

[rsheeter]

I must have something python out of date where I tested then. I'll retry in a bit and probably close.

[rsheeter]

OK cool, I think fonttools 4.43.0 => 4.43.1 helped. I still see different OS/2 and head so maybe we can fix that then close since MVAR has a ticket of it's own.