[PATCH] Fix some value comments

[Tom Tromey <tromey@adacore.com>]

I noticed a very stale comment in valarith.c.  This patch fixes a few
comments in this area.
---
 gdb/valarith.c | 6 +++++-
 gdb/value.h    | 5 +++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/gdb/valarith.c b/gdb/valarith.c
index 6ea0cd9e8d1..4c2b44360bb 100644
--- a/gdb/valarith.c
+++ b/gdb/valarith.c
@@ -1884,7 +1884,7 @@ value_less (struct value *arg1, struct value *arg2)
     }
 }
 \f
-/* The unary operators +, - and ~.  They free the argument ARG1.  */
+/* See value.h.  */
 
 struct value *
 value_pos (struct value *arg1)
@@ -1902,6 +1902,8 @@ value_pos (struct value *arg1)
     error (_("Argument to positive operation not a number."));
 }
 
+/* See value.h.  */
+
 struct value *
 value_neg (struct value *arg1)
 {
@@ -1948,6 +1950,8 @@ value_neg (struct value *arg1)
     error (_("Argument to negate operation not a number."));
 }
 
+/* See value.h.  */
+
 struct value *
 value_complement (struct value *arg1)
 {
diff --git a/gdb/value.h b/gdb/value.h
index c3eb96bf143..d83c4ab3674 100644
--- a/gdb/value.h
+++ b/gdb/value.h
@@ -1206,10 +1206,15 @@ extern struct value *value_ref (struct value *arg1, enum type_code refcode);
 extern struct value *value_assign (struct value *toval,
 				   struct value *fromval);
 
+/* The unary + operation.  */
 extern struct value *value_pos (struct value *arg1);
 
+/* The unary - operation.  */
 extern struct value *value_neg (struct value *arg1);
 
+/* The unary ~ operation -- but note that it also implements the GCC
+   extension, where ~ of a complex number is the complex
+   conjugate.  */
 extern struct value *value_complement (struct value *arg1);
 
 extern struct value *value_struct_elt (struct value **argp,
-- 
2.39.1