[RFA/commit+doco] Add "language-option" to -list-features

[Joel Brobecker <brobecker at adacore dot com>]

Hello,

Following the addition of the --language optiton to all GDB/MI
commands,  I realized that there was no easy way for front-ends
to figure out whether this features is available or not. So I added
a "language-option" entry to -list-features.

gdb/ChangeLog:

        * mi/mi-main.c (mi_cmd_list_features): Add "language-options"
        to -list-features output.

gdb/doc/ChangeLog:

        * gdb.texinfo (GDB/MI Miscellaneous Commands): Document the new
        "language-option" entry in the output of the "-list-features"
        command.

Tested on x86_64-linux. I think the code change is fairly
straightforward, and easy to adjust if there are suggestions.
So I'll commit as soon as the doco has been OK'ed.

Thanks!
-- 
Joel

---
 gdb/doc/gdb.texinfo | 3 +++
 gdb/mi/mi-main.c    | 1 +
 2 files changed, 4 insertions(+)

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index a164785..29955f6 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -35106,6 +35106,9 @@ Indicates support for the @code{-ada-task-info} command.
 Indicates support for the following commands, all of them related to Ada
 exceptions: @code{-info-ada-exceptions}, @code{-catch-assert} and
 @code{-catch-exception}.
+@item language-option
+Indicates that all @sc{gdb/mi} commands accept the @option{--language}
+option (@pxref{Context management}).
 @end table
 
 @subheading The @code{-list-target-features} Command
diff --git a/gdb/mi/mi-main.c b/gdb/mi/mi-main.c
index bbf944a..83d524a 100644
--- a/gdb/mi/mi-main.c
+++ b/gdb/mi/mi-main.c
@@ -1816,6 +1816,7 @@ mi_cmd_list_features (char *command, char **argv, int argc)
       ui_out_field_string (uiout, NULL, "breakpoint-notifications");
       ui_out_field_string (uiout, NULL, "ada-task-info");
       ui_out_field_string (uiout, NULL, "ada-exceptions");
+      ui_out_field_string (uiout, NULL, "language-option");
       
 #if HAVE_PYTHON
       if (gdb_python_initialized)
-- 
1.8.1.2