compile: set debug compile: Display GCC driver filename

As discussed in
	How to use compile & execute function in GDB
	https://sourceware.org/ml/gdb/2015-04/msg00026.html

GDB currently searches for compilers on /usr/bin/ARCH-OS-gcc and
chooses a match from there.  However, it is not currently possible for
the user to display which compiler was selected.  Up until now, GDB's
compiler interface was not up-to-date with GCC's one, which means that
it wasn't possible to obtain this information.  This patch implements
the mechanisms necessary for that.

gdb/ChangeLog
2017-08-23  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* compile/compile.c (compile_to_object): Conditionally call
	set_verbose.  Conditionally call compile or compile_v0.

include/ChangeLog
2017-08-23  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gcc-interface.h (enum gcc_base_api_version): Add
	GCC_FE_VERSION_1.
	(struct gcc_base_vtable): Rename compile to compile_v0.  Update
	comment for compile.  New methods set_verbose and compile.

gdb/ChangeLog

@@ -1,3 +1,8 @@
+2017-08-23  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	* compile/compile.c (compile_to_object): Conditionally call
+	set_verbose.  Conditionally call compile or compile_v0.
+
 2017-08-07  Weimin Pan  <weimin.pan@oracle.com>
 
 	* sparc64-tdep.h: (adi_normalize_address): New export.

gdb/compile/compile.c

@@ -516,6 +516,9 @@ compile_to_object (struct command_line *cmd, const char *cmd_string,
   get_args (compiler, gdbarch, &argc, &argv);
   gdb_argv argv_holder (argv);
 
+  if (compiler->fe->ops->version >= GCC_FE_VERSION_1)
+    compiler->fe->ops->set_verbose (compiler->fe, compile_debug);
+
   error_message = compiler->fe->ops->set_arguments (compiler->fe, triplet_rx,
 						    argc, argv);
   if (error_message != NULL)
@@ -556,8 +559,12 @@ compile_to_object (struct command_line *cmd, const char *cmd_string,
   /* Call the compiler and start the compilation process.  */
   compiler->fe->ops->set_source_file (compiler->fe, fnames.source_file ());
 
-  if (!compiler->fe->ops->compile (compiler->fe, fnames.object_file (),
+  if (compiler->fe->ops->version >= GCC_FE_VERSION_1)
-				   compile_debug))
+    ok = compiler->fe->ops->compile (compiler->fe, fnames.object_file ());
+  else
+    ok = compiler->fe->ops->compile_v0 (compiler->fe, fnames.object_file (),
+					compile_debug);
+  if (!ok)
     error (_("Compilation failed."));
 
   if (compile_debug)

include/ChangeLog

@@ -1,3 +1,10 @@
+2017-08-23  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	* gcc-interface.h (enum gcc_base_api_version): Add
+	GCC_FE_VERSION_1.
+	(struct gcc_base_vtable): Rename compile to compile_v0.  Update
+	comment for compile.  New methods set_verbose and compile.
+
 2017-08-21  Alexander Fedotov <alexander.fedotov@nxp.com>
 	    Edmar Wienskoski <edmar.wienskoski@nxp.com>
 

include/gcc-interface.h

@@ -44,7 +44,10 @@ struct gcc_base_context;
 
 enum gcc_base_api_version
 {
-  GCC_FE_VERSION_0 = 0
+  GCC_FE_VERSION_0 = 0,
+
+  /* Deprecated method compile_v0.  Added method set_verbose and compile.  */
+  GCC_FE_VERSION_1 = 1,
 };
 
 /* The operations defined by the GCC base API.  This is the vtable for
@@ -93,18 +96,35 @@ struct gcc_base_vtable
 						      const char *message),
 			      void *datum);
 
-  /* Perform the compilation.  FILENAME is the name of the resulting
+  /* Deprecated GCC_FE_VERSION_0 variant of the GCC_FE_VERSION_1
-     object file.  VERBOSE can be set to cause GCC to print some
+     compile method.  GCC_FE_VERSION_0 version verbose parameter has
-     information as it works.  Returns true on success, false on
+     been replaced by the set_verbose method.  */
-     error.  */
 
-  int /* bool */ (*compile) (struct gcc_base_context *self,
+  int /* bool */ (*compile_v0) (struct gcc_base_context *self,
-			     const char *filename,
+				const char *filename,
-			     int /* bool */ verbose);
+				int /* bool */ verbose);
 
   /* Destroy this object.  */
 
   void (*destroy) (struct gcc_base_context *self);
+
+  /* VERBOSE can be set to non-zero to cause GCC to print some
+     information as it works.  Calling this method overrides its
+     possible previous calls.
+
+     This method is only available since GCC_FE_VERSION_1.  */
+
+  void (*set_verbose) (struct gcc_base_context *self,
+		       int /* bool */ verbose);
+
+  /* Perform the compilation.  FILENAME is the name of the resulting
+     object file.  Either set_triplet_regexp or set_driver_filename must
+     be called before.  Returns true on success, false on error.
+
+     This method is only available since GCC_FE_VERSION_1.  */
+
+  int /* bool */ (*compile) (struct gcc_base_context *self,
+			     const char *filename);
 };
 
 /* The GCC object.  */