make: permit Unix-style paths when setting MAKE

The 'make' applet follows POSIX requirements when setting the MAKE
variable.  However, it doesn't allow for the case where argv[0] is
of a form like '/bin/make' but no corresponding executable exists.
This can happen in busybox-w32 when '/bin/make' is interpreted as
a reference to the 'make' applet.

In this case set the MAKE variable to argv[0] and avoid issuing a
warning.

Setting MAKE to something that isn't a real executable is fine so
long as it's only used by busybox-w32 applets.  If it's used by
external applications they may get confused.

Adds 16-32 bytes.

(GitHub issue #354)

1 files changed, 4 insertions, 1 deletions

diff --git a/miscutils/make.c b/miscutils/make.c
index 8feec1202..b6103bb58 100644
--- a/miscutils/make.c
+++ b/miscutils/make.c
@@ -2820,7 +2820,10 @@ int make_main(int argc UNUSED_PARAM, char **argv)
                         path = newpath = xmalloc_realpath(p);
                         free(p);
                         if (!path) {
-                                bb_perror_msg("can't resolve path for %s", argv[0]);
+                                if (unix_path(argv[0]))
+                                        path = argv[0];
+                                else
+                                        bb_perror_msg("can't resolve path for %s", argv[0]);
                         }
                 }
 #else