[meson] Require ragel 6.10

Ragel 7 is also not stable from upstream's point of view.

This uses “version” argument find_program(), which was introduced in
meson 0.52.0, so I raised the minimum required meson version
accordingly.

.circleci/config.yml

@@ -68,7 +68,7 @@ jobs:
     steps:
       - checkout
       - run: apk update && apk add ragel gcc g++ glib-dev freetype-dev cairo-dev git py3-pip ninja
-      - run: pip3 install meson==0.47.0
+      - run: pip3 install meson==0.52.0
       - run: meson build --buildtype=minsize
       - run: ninja -Cbuild -j9
       - run: meson test -Cbuild --print-errorlogs

.github/workflows/linux-ci.yml

@@ -14,7 +14,7 @@ jobs:
     - uses: actions/checkout@v2
     - name: install dependencies
       run: sudo apt-get install pkg-config gcc ragel gcovr gtk-doc-tools libfreetype6-dev libglib2.0-dev libcairo2-dev libicu-dev libgraphite2-dev python3 python3-setuptools ninja-build gobject-introspection libgirepository1.0-dev
-    - run: sudo pip3 install fonttools meson==0.47.0
+    - run: sudo pip3 install fonttools meson==0.52.0
     - name: run
       run: meson build -Db_coverage=true --auto-features=enabled -Dgraphite=enabled -Dchafa=disabled -Doptimization=2
     - name: ci

meson.build

@@ -1,5 +1,5 @@
 project('harfbuzz', 'c', 'cpp',
-  meson_version: '>= 0.47.0',
+  meson_version: '>= 0.52.0',
   version: '2.9.1',
   default_options: [
     'cpp_eh=none',          # Just to support msvc, we are passing -fno-rtti also anyway

src/meson.build

@@ -290,7 +290,7 @@ hb_gobject_headers = files(
   'hb-gobject-structs.h',
 )
 
-ragel = find_program('ragel', required: false)
+ragel = find_program('ragel', version: '6.10', required: false)
 if not ragel.found()
   warning('You have to install ragel if you are going to develop HarfBuzz itself')
 else