Support response files, and use that in Asyncify (#2319)

See emscripten-core/emscripten#9206, the asyncify names can need complex escaping, so this provides an escape hatch.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/support/file.h b/src/support/file.h
index 67d63315b..fb3cad564 100644
--- a/src/support/file.h
+++ b/src/support/file.h
@@ -39,12 +39,18 @@ template<typename T>
 T read_file(const std::string& filename,
             Flags::BinaryOption binary,
             Flags::DebugOption debug);
+
 // Declare the valid explicit specializations.
 extern template std::string
 read_file<>(const std::string&, Flags::BinaryOption, Flags::DebugOption);
 extern template std::vector<char>
 read_file<>(const std::string&, Flags::BinaryOption, Flags::DebugOption);
 
+// Given a string which may be a response file (i.e., a filename starting
+// with "@"), if it is a response file read it and return that, or if it
+// is not a response file, return it as is.
+std::string read_possible_response_file(const std::string&);
+
 class Output {
 public:
   // An empty filename will open stdout instead.