[wasm] Infra for iwasm llvm build

meson.build

@@ -115,6 +115,8 @@ gobject_dep = dependency('gobject-2.0', required: get_option('gobject'))
 graphite2_dep = dependency('graphite2', required: get_option('graphite2'))
 graphite_dep = dependency('graphite2', required: get_option('graphite'))
 wasm_dep = cpp.find_library('iwasm', required: get_option('wasm'))
+# How to check whether iwasm was built, and hence requires, LLVM?
+#llvm_dep = cpp.find_library('LLVM-15', required: get_option('wasm'))
 
 if meson.version().version_compare('>=0.60.0')
   # pkg-config: icu-uc, cmake: ICU but with components

src/meson.build

@@ -476,6 +476,7 @@ if conf.get('HAVE_WASM', 0) == 1
   hb_sources += hb_wasm_sources
   hb_headers += hb_wasm_headers
   harfbuzz_deps += wasm_dep
+  #harfbuzz_deps += llvm_dep
 endif
 
 if conf.get('HAVE_UNISCRIBE', 0) == 1