K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2021-11-08T14:04:24.753771Z
K 7
svn:log
V 685
strip/objcopy: handle empty file as unknown

Previously strip reported a somewhat cryptic error for empty files:

    strip: elf_begin() failed: Invalid argument

Add a special case to treat empty files as with an unknown file format.
This is consistent with llvm-strip.  GNU strip produces no output which
does not seem like useful behaviour (but it does exit with status 1).

Reported by:	andrew
Reviewed by:	markj
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32648

(cherry picked from commit 179219ea046f46927d6478d43431e8b541703539)

Git Hash:   2cd53619a1fcdb1283ca1b813ecf10ec9bdb5b0b
Git Author: emaste@FreeBSD.org
END