lz4: try to fix MSVC compilation

Signed-off-by: Rosen Penev <[email protected]>

ci_config.json

@@ -324,12 +324,6 @@
       "lmdb:programs=true"
     ]
   },
-  "lz4": {
-    "_comment": "dllexport strikes again",
-    "build_on": {
-      "windows": false
-    }
-  },
   "mpdecimal": {
     "build_options": [
       "mpdecimal:examples=true",

releases.json

@@ -1241,6 +1241,7 @@
       "liblz4"
     ],
     "versions": [
+      "1.9.4-2",
       "1.9.4-1",
       "1.9.3-1",
       "1.9.2-1"

subprojects/packagefiles/lz4/meson.build

@@ -372,7 +372,7 @@
 
 project(
   'lz4',
-  ['c'],
+  'c',
   license: 'BSD-2-Clause-Patent AND GPL-2.0-or-later',
   default_options: [
     'c_std=c99',
@@ -383,4 +383,16 @@ project(
   meson_version: '>=0.49.0'
 )
 
+# upstream meson.build has this as c_args that get passed to nowhere
+if host_machine.system() == 'windows' and get_option('default_library') != 'static'
+  add_project_arguments('-DLZ4_DLL_EXPORT=1', language: 'c')
+endif
+
+if get_option('unstable')
+  add_project_arguments('-DLZ4_STATIC_LINKING_ONLY', language: 'c')
+  if get_option('default_library') != 'static'
+    add_project_arguments('-DLZ4_PUBLISH_STATIC_FUNCTIONS', language: 'c')
+  endif
+endif
+
 subdir('contrib/meson/meson')