error: Track locations on command line

New LOC_CMDLINE.  Use it for tracking option with argument in
lookup_opt().  We now report errors like this

    qemu: -device smbus-eeprom: Did not find I2C bus for smbus-eeprom

1 files changed, 2 insertions, 1 deletions

diff --git a/qemu-error.h b/qemu-error.h
index 8f2a140ef..88e0b7056 100644
--- a/qemu-error.h
+++ b/qemu-error.h
@@ -15,7 +15,7 @@
 
 typedef struct Location {
     /* all members are private to qemu-error.c */
-    enum { LOC_NONE, LOC_FILE } kind;
+    enum { LOC_NONE, LOC_CMDLINE, LOC_FILE } kind;
     int num;
     const void *ptr;
     struct Location *prev;
@@ -27,6 +27,7 @@ Location *loc_pop(Location *loc);
 Location *loc_save(Location *loc);
 void loc_restore(Location *loc);
 void loc_set_none(void);
+void loc_set_cmdline(char **argv, int idx, int cnt);
 void loc_set_file(const char *fname, int lno);
 
 void error_vprintf(const char *fmt, va_list ap);