Emacs needs the dtoastr function, but not ftoastr or ldtoastr. To save build time, it'd be nice if it could build just dtoastr. The easiest way I can think of to do that is to split up the existing ftoastr module (which supports all three functions) into three modules: ftoastr, dtoastr, ldtoastr, one for each function. (Perhaps there's a better way? but I can't think of it offhand.)
While looking into this I noticed that ftoastr, like some but not all other modules, puts a .h file into lib_SOURCES: lib_SOURCES += ftoastr.h ftoastr.c dtoastr.c ldtoastr.c Now I naively had thought that lib_SOURCES was just for .c files that produce .o files. Is my assumption incorrect? I see that other modules are inconsistent in this area. If I'm right, other modules should be altered so that lib_SOURCES does not mention .h files; if I'm wrong, I'd like to know what lib_SOURCES is for, and perhaps other modules need to be altered so that their lib_SOURCES mention .h files.
