Create files.x86

[imp]

Summary

files.x86 is for the parts of the system that are common to both i386 and amd64
due too their nature. First up, to get the ball rolling, is fdc, the floppy disk
support. It works only on amd64 and i386 these days, and that's unlikely to
change.

[imp]

This commit is purposely thin to get the framework up and going so we can focus on framework issues.

[cem]

LGTM if it works (is fdc in GENERIC?)

[jhb]

Ah, I had thought we would use 'include' in files.i386 and files.amd64 rather than DEFAULTS, but either way is fine with me.

[imp]

In D21210#461467, @jhb wrote:

Ah, I had thought we would use 'include' in files.i386 and files.amd64 rather than DEFAULTS, but either way is fine with me.

I would have, except that no such directive exists inside of files* files. config is annoyingly non-orthogonal.

[jhb]

Oh, I thought it seemed to be there from the code I read on Friday:

static void
read_file(char *fname)
{
...
	/*
	 * include "filename"
	 * filename    [ standard | optional ]
	 *	[ dev* [ | dev* ... ] | profiling-routine ] [ no-obj ]
	 *	[ compile-with "compile rule" [no-implicit-rule] ]
	 *      [ dependency "dependency-list"] [ before-depend ]
	 *	[ clean "file-list"] [ warning "text warning" ]
	 *	[ obj-prefix "file prefix"]
	 */
...
	if (eq(wd, "include")) {
		wd = get_quoted_word(fp);
		if (wd == (char *)EOF || wd == NULL)
			errout("%s: missing include filename.\n", fname);
		(void) snprintf(ifname, sizeof(ifname), "../../%s", wd);
		read_file(ifname);
		while (((wd = get_word(fp)) != (char *)EOF) && wd)
			;
		goto next;
	}

[imp]

In D21210#461496, @jhb wrote:

Oh, I thought it seemed to be there from the code I read on Friday:

static void
read_file(char *fname)
{
...
	/*
	 * include "filename"
	 * filename    [ standard | optional ]
	 *	[ dev* [ | dev* ... ] | profiling-routine ] [ no-obj ]
	 *	[ compile-with "compile rule" [no-implicit-rule] ]
	 *      [ dependency "dependency-list"] [ before-depend ]
	 *	[ clean "file-list"] [ warning "text warning" ]
	 *	[ obj-prefix "file prefix"]
	 */
...
	if (eq(wd, "include")) {
		wd = get_quoted_word(fp);
		if (wd == (char *)EOF || wd == NULL)
			errout("%s: missing include filename.\n", fname);
		(void) snprintf(ifname, sizeof(ifname), "../../%s", wd);
		read_file(ifname);
		while (((wd = get_word(fp)) != (char *)EOF) && wd)
			;
		goto next;
	}

oh my! It's completely unused in the tree then...

seems to work though, so I'll switch.

[imp]

Update to use include more directly, per jhb