Use ModuleReader::readStdin for file "-" (#4114)

After #4106 we already treat the input file "-" as a shorthand for reading from
stdin at the file.cpp level. However, the "-" input was still treated as a
normal file name at the wasm-io.cpp file and as a result was always treated as
text input. This commit updates wasm-io.cpp to use the stdin code path
supporting both binary and text input for "-".

Fixes #4105 (again).

1 files changed, 2 insertions, 2 deletions

diff --git a/src/wasm/wasm-io.cpp b/src/wasm/wasm-io.cpp
index b8d67f4d5..b94fc8470 100644
--- a/src/wasm/wasm-io.cpp
+++ b/src/wasm/wasm-io.cpp
@@ -88,8 +88,8 @@ bool ModuleReader::isBinaryFile(std::string filename) {
 void ModuleReader::read(std::string filename,
                         Module& wasm,
                         std::string sourceMapFilename) {
-  // empty filename means read from stdin
-  if (!filename.size()) {
+  // empty filename or "-" means read from stdin
+  if (!filename.size() || filename == "-") {
     readStdin(wasm, sourceMapFilename);
     return;
   }