Note that it fails for me in both Chrome and Firefox, I don't see a browser difference.
On Thu, Oct 30, 2025 at 10:32 AM Alon Zakai <[email protected]> wrote: > Thanks for reporting, this turns out ot be a recent regression in > SINGLE_FILE. I bisected to > > https://github.com/emscripten-core/emscripten/pull/25599 > > and posted there. > > - Alon > > > On Thu, Oct 30, 2025 at 6:02 AM Thomas Grund <[email protected]> > wrote: > >> Hello, >> >> The following example does >> >> - not work with current emcc 4.0.18 in Chrome. >> >> It >> >> - works with current emcc 4.0.18 in Firefox and it >> - works with emcc 4.0.16 in Chrome. >> >> I use local files on Windows 11. >> >> Example index.html: >> <!DOCTYPE html> >> <html> >> <head> >> <script> >> function compute() { >> a=parseFloat(document.getElementById('a').value); >> b=parseFloat(document.getElementById('b').value); >> document.getElementById('c').innerText = Module.Sum(a, b); >> } >> </script> >> <script src="Sum.js"></script> >> </head> >> <body> >> <input id="a" type="number" onchange="compute()"> >> <input id="b" type="number" onchange="compute()"> >> <div id="c">Result</div> >> </body> >> </html> >> >> Example Sum.cpp: >> #include <emscripten/bind.h> >> >> double Sum(double a, double b) { >> return a+b; >> } >> >> EMSCRIPTEN_BINDINGS(Module) { >> emscripten::function("Sum", &Sum); >> } >> >> Compile with: >> emcc -o Sum.js Sum.cpp -sSINGLE_FILE --bind -sASSERTIONS >> >> Error in Chrome Console: >> failed to asynchronously prepare wasm: CompileError: >> WebAssembly.instantiate(): section was shorter than expected size (18371 >> bytes expected, 207 decoded) @+219 >> instantiateArrayBuffer @ Sum.js:634 >> await in instantiateArrayBuffer >> instantiateAsync @ Sum.js:645 >> createWasm @ Sum.js:713 >> (anonymous) @ Sum.js:2761Understand this error >> Sum.js:275 Uncaught (in promise) TypeError: filename.startsWith is not a >> function >> isFileURI @ Sum.js:275 >> instantiateArrayBuffer @ Sum.js:637 >> await in instantiateArrayBuffer >> instantiateAsync @ Sum.js:645 >> createWasm @ Sum.js:713 >> (anonymous) @ Sum.js:2761Understand this error >> Sum.js:794 still waiting on run dependencies: >> (anonymous) @ Sum.js:794 >> setInterval >> addRunDependency @ Sum.js:784 >> createWasm @ Sum.js:674 >> (anonymous) @ Sum.js:2761Understand this error >> Sum.js:796 dependency: wasm-instantiate >> (anonymous) @ Sum.js:796 >> setInterval >> addRunDependency @ Sum.js:784 >> createWasm @ Sum.js:674 >> (anonymous) @ Sum.js:2761Understand this error >> Sum.js:799 (end of list) >> (anonymous) @ Sum.js:799 >> setInterval >> addRunDependency @ Sum.js:784 >> createWasm @ Sum.js:674 >> (anonymous) @ Sum.js:2761Understand this error >> >> What am I doing wrong? >> >> Thanks for your help! >> Thomas >> >> -- >> You received this message because you are subscribed to the Google Groups >> "emscripten-discuss" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion visit >> https://groups.google.com/d/msgid/emscripten-discuss/504419d6-cdcf-4eec-9a1e-e7f69f87a129n%40googlegroups.com >> <https://groups.google.com/d/msgid/emscripten-discuss/504419d6-cdcf-4eec-9a1e-e7f69f87a129n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/emscripten-discuss/CAEX4NpSHMne5aJ6Ju0%2B1w0E-vNeo1LF-UQiTf49nxDwSLz%3DNgw%40mail.gmail.com.
