Return unique_ptr from language_defn::get_compile_context

This changes language_defn::get_compile_context to return a
unique_ptr.  This makes the ownership transfer clear.

gdb/ChangeLog
2021-02-05  Tom Tromey  <tom@tromey.com>

	* compile/compile-c-support.c (get_compile_context)
	(c_get_compile_context, cplus_get_compile_context): Change return
	type.
	* language.c (language_defn::get_compile_instance): New method.
	* language.h (language_defn::get_compile_instance): Change return
	type.  No longer inline.
	* c-lang.c (c_language::get_compile_instance): Change return type.
	(cplus_language::get_compile_instance): Change return type.
	* c-lang.h (c_get_compile_context, cplus_get_compile_context):
	Change return type.
	* compile/compile.c (compile_to_object): Update.

1 files changed, 9 insertions, 0 deletions

diff --git a/gdb/language.c b/gdb/language.c
index 8dde504..c23f291 100644
--- a/gdb/language.c
+++ b/gdb/language.c
@@ -46,6 +46,7 @@
 #include "c-lang.h"
 #include <algorithm>
 #include "gdbarch.h"
+#include "compile/compile-internal.h"
 
 static void set_range_case (void);
 
@@ -704,6 +705,14 @@ language_defn::is_string_type_p (struct type *type) const
   return c_is_string_type_p (type);
 }
 
+/* See language.h.  */
+
+std::unique_ptr<compile_instance>
+language_defn::get_compile_instance () const
+{
+  return {};
+}
+
 /* The default implementation of the get_symbol_name_matcher_inner method
    from the language_defn class.  Matches with strncmp_iw.  */