lua: support building as C++

releases.json

@@ -3001,6 +3001,7 @@
       "lua"
     ],
     "versions": [
+      "5.5.0-2",
       "5.5.0-1",
       "5.4.8-1",
       "5.4.6-5",

subprojects/packagefiles/lua/meson.build

@@ -10,9 +10,15 @@ project(
 lua_versions = meson.project_version().split('.')
 cc = meson.get_compiler('c')
 
-override_options = [
-  'c_std=c99',
-]
+override_options = []
+
+build_as_cpp = get_option('lua_cpp')
+
+if not build_as_cpp
+  override_options  += [
+    'c_std=c99',
+  ]
+endif
 
 # Skip bogus warning.
 add_project_arguments(
@@ -73,6 +79,19 @@ if dl_dep.found()
   )
 endif
 
+
+if build_as_cpp
+ if cc.get_id() == 'msvc'
+    add_project_arguments('/TP', '/EHa', language: 'c')
+  elif cc.get_id() == 'gcc' or cc.get_id() == 'clang'
+    add_project_arguments(
+      '-xc++',
+      language: 'c'
+    )
+  else
+    warning('Unknown compiler family. We do not know how to enforce C++ on C files')
+endif
+
 # Interpreter dependencies.
 lua_exe_deps = []
 lua_exe_args = []
@@ -146,7 +165,12 @@ meson.override_dependency(
   lua_dep,
 )
 
-if get_option('interpreter')
+# Note: you can compile C code as C++, but you can't link it. Clang compiler
+# has option to treat C source code as C++, but clang linker does not. And
+# as there are several possible C++ standard libraries, we can't just pick
+# one and pass it to linker explicitly.
+# If building Lua as C++ is enabed, then disable interpreter
+if get_option('interpreter') and not build_as_cpp
   lua_exe = executable(
     'lua',
     'src/lua.c',

subprojects/packagefiles/lua/meson_options.txt

@@ -14,3 +14,9 @@ option(
     value: true,
     description: 'Build the Lua interpreter.',
 )
+option(
+    'lua_cpp',
+    type: 'boolean',
+    value: false,
+    description: 'Build Lua as C++. This will disable building interpreter and executable ',
+)