Add (non-wprking) cpp-to-wasm test

Author: Manishearth

ffi/cpp/examples/fixeddecimal/Makefile

@@ -22,4 +22,12 @@ a.out: ../../../../target/debug/libicu_capi.a $(ALL_HEADERS) test.cpp
 build: a.out
 
 test: build
-	./a.out
+	./a.out
+
+
+../../../../target/wasm32-unknown-unknown/debug/libicu_capi.a: $(ALL_RUST)
+	cargo +nightly build -p icu_capi --target wasm32-unknown-unknown -Z build-std=std,panic_abort -Z build-std-features=panic_immediate_abort
+
+# Currently this doesn't run successfully, however it's the status quo of compiling ICU4X in C++ to WASM
+main.html: ../../../../target/wasm32-unknown-unknown/debug/libicu_capi.a $(ALL_HEADERS) test.cpp
+	emcc -std=c++17 test.cpp ../../../../target/wasm32-unknown-unknown/debug/libicu_capi.a -ldl -lpthread -lm -DWASM -g  -o main.html --emrun -sWASM=1

ffi/cpp/examples/fixeddecimal/test.cpp

@@ -6,13 +6,18 @@
 
 #include <iostream>
 
+#ifndef WASM
 const std::string_view path = "../../../../provider/testdata/data/json/";
+#endif
 
 int main() {
     ICU4XLocale locale = ICU4XLocale::create("bn").value();
     std::cout << "Running test for locale " << locale.tostring().ok().value() << std::endl;
+#ifdef WASM
+    ICU4XDataProvider dp = ICU4XDataProvider::create_static().provider.value();
+#else
     ICU4XDataProvider dp = ICU4XDataProvider::create_fs(path).provider.value();
-
+#endif
     ICU4XFixedDecimalFormatOptions opts = {ICU4XFixedDecimalGroupingStrategy::Auto, ICU4XFixedDecimalSignDisplay::Auto};
     ICU4XFixedDecimalFormat fdf = ICU4XFixedDecimalFormat::try_new(locale, dp, opts).fdf.value();