emcc: recursive response files are ignored

[ktock]

Emcc fails to compile a program if a respose file contains a reference to another respose file.

Version of emscripten/emsdk:

emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 4.0.15 (09f52557f0d48b65b8c724853ed8f4e8bf80e669)
clang version 22.0.0git (https:/github.com/llvm/llvm-project 3388d40684742e950b3c5d1d2dafe5a40695cfc1)
Target: wasm32-unknown-emscripten
Thread model: posix
InstalledDir: /emsdk/upstream/bin

Failing command line in full:

hello.c

#include <stdio.h>

int main() {
  printf("hello\n");
  return 0;
}

file1 (response file)

@file2

file2 (response file)

-o hello hello.c

file1 points to another response file file2.

Expected behaviour

Both of emcc @file1 and emcc @file2 succeeds.

Actual behaviour

• emcc @file1 : failed with an error emcc: error: @file2: No such file or directory ("@file2" was expected to be an input file, based on the commandline arguments provided)
• emcc @file2 : succeeded

Full link command and output with -v appended:

N/A

Additional information

GCC supports recursive response files, according to the man page.

The file may itself contain additional @file options; any such options will be processed recursively.

[sbc100]

Yes, it looks like clang also supports this.