Does anyone have some thoughts they'd like to share on this: "When you compile anything using @file support, the driver assumes @file (at_file_supplied is true) is allowed and may pass options to the linker via @file using a *temporary* file.
When -save-temps is also used, the temporary @file passed to the linker should also be saved. Saving the temporary @file passed to the linker allows a developer to re-run just the collect2/ld command. On trunk this means that gcc/gcc.c (create_at_file) should honour the save_temps_flag, saving the temporary @file for later analysis or use." From: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44273