Tell the compiler these structures are aligned to a byte boundary.

All the elements of these structs are char anyway, so it won't hurt
performance.

Bump warns back up to the default.

# we likely should have CTASSERTS to make sure they are the right size.
# but with libarchive based tar maybe we shouldn't bother.

bin/pax/Makefile

@@ -33,6 +33,4 @@ SRCS=	ar_io.c ar_subs.c buf_subs.c cache.c cpio.c file_subs.c ftree.c \
 #MAN=	pax.1 tar.1 cpio.1
 #LINKS=	${BINDIR}/pax ${BINDIR}/tar ${BINDIR}/pax ${BINDIR}/cpio
 
-WARNS?=	3
-
 .include <bsd.prog.mk>

bin/pax/cpio.h

@@ -67,7 +67,7 @@ typedef struct {
 	char	c_mtime[11];		/* modification time */
 	char	c_namesize[6];		/* length of pathname */
 	char	c_filesize[11];		/* length of file in bytes */
-} HD_CPIO;
+} HD_CPIO __aligned(1);
 
 #define	MAGIC		070707		/* transportable archive id */
 
@@ -98,7 +98,7 @@ typedef struct {
 	u_char	h_namesize[2];
 	u_char	h_filesize_1[2];
 	u_char	h_filesize_2[2];
-} HD_BCPIO;
+} HD_BCPIO __aligned(1);
 
 #ifdef _PAX_
 /*
@@ -136,7 +136,7 @@ typedef struct {
 	char	c_rmin[8];		/* special file minor # */
 	char	c_namesize[8];		/* length of pathname */
 	char	c_chksum[8];		/* 0 OR CRC of bytes of FILE data */
-} HD_VCPIO;
+} HD_VCPIO __aligned(1);
 
 #define	VMAGIC		070701		/* sVr4 new portable archive id */
 #define	VCMAGIC		070702		/* sVr4 new portable archive id CRC */

bin/pax/tar.h

@@ -96,7 +96,7 @@ typedef struct {
 	char chksum[CHK_LEN];		/* checksum */
 	char linkflag;			/* norm, hard, or sym. */
 	char linkname[TNMSZ];		/* linked to name */
-} HD_TAR;
+} HD_TAR __aligned(1);
 
 #ifdef _PAX_
 /*
@@ -142,4 +142,4 @@ typedef struct {
 	char devmajor[8];		/* major device number */
 	char devminor[8];		/* minor device number */
 	char prefix[TPFSZ];		/* linked to name */
-} HD_USTAR;
+} HD_USTAR __aligned(1);