[gdb] Handle ^C in gnu_source_highlight_test

In gnu_source_highlight_test we have:
...
  try
    {
      res = try_source_highlight (styled_prog, language_c, fullname);
    }
  catch (...)
    {
      saw_exception = true;
    }
...

This also swallows gdb_exception_quit and gdb_exception_forced_quit.  I don't
know whether these can actually happen here, but if not it's better to
accommodate for the possibility anyway.

Fix this by handling gdb_exception explicitly, and rethrowing
gdb_exception_quit and gdb_exception_forced_quit.

Tested on aarch64-linux.

Approved-By: Tom Tromey <tom@tromey.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/gdb/source-cache.c b/gdb/source-cache.c
index 2815b6e..f08c872 100644
--- a/gdb/source-cache.c
+++ b/gdb/source-cache.c
@@ -282,6 +282,12 @@ static void gnu_source_highlight_test ()
     {
       res = try_source_highlight (styled_prog, language_c, fullname);
     }
+  catch (const gdb_exception &e)
+    {
+      if (e.reason != RETURN_ERROR)
+	throw;
+      saw_exception = true;
+    }
   catch (...)
     {
       saw_exception = true;