2019-01-17  Jakub Jelinek  <jakub@redhat.com>

	* gcc.c (offload_targets_default): New variable.

	(process_command): Set it if -foffload is defaulted.

	(driver::maybe_putenv_OFFLOAD_TARGETS): Add OFFLOAD_TARGET_DEFAULT=1

	into environment if -foffload has been defaulted.

	* lto-wrapper.c (OFFLOAD_TARGET_DEFAULT_ENV): Define.

	(compile_offload_image): If OFFLOAD_TARGET_DEFAULT

	is in the environment, don't fail if corresponding mkoffload

	can't be found.

	(compile_images_for_offload_targets): Likewise.  Free and clear

	offload_names if no valid offload is found.

libgomp/

	* target.c (gomp_load_plugin_for_device): If a plugin can't be

	dlopened, assume it has no devices silently.

--- gcc/gcc.c.jj	2017-01-17 10:28:40.000000000 +0100

+++ gcc/gcc.c	2017-01-20 16:26:29.649962902 +0100

@@ -319,6 +319,10 @@ static const char *spec_host_machine = D

 static char *offload_targets = NULL;

+/* Set to true if -foffload has not been used and offload_targets

+   is set to the configured in default.  */

+static bool offload_targets_default;

+

 /* Nonzero if cross-compiling.

    When -b is used, the value comes from the `specs' file.  */

@@ -4828,7 +4832,10 @@ process_command (unsigned int decoded_op

   /* If the user didn't specify any, default to all configured offload

      targets.  */

   if (ENABLE_OFFLOADING && offload_targets == NULL)

-    handle_foffload_option (OFFLOAD_TARGETS);

+    {

+      handle_foffload_option (OFFLOAD_TARGETS);

+      offload_targets_default = true;

+    }

   /* Handle -gtoggle as it would later in toplev.c:process_options to

      make the debug-level-gt spec function work as expected.  */

@@ -8494,6 +8501,8 @@ driver::maybe_putenv_OFFLOAD_TARGETS ()

       obstack_grow (&collect_obstack, offload_targets,

 		    strlen (offload_targets) + 1);

       xputenv (XOBFINISH (&collect_obstack, char *));

+      if (offload_targets_default)

+	xputenv ("OFFLOAD_TARGET_DEFAULT=1");

     }

   free (offload_targets);

--- gcc/lto-wrapper.c.jj	2017-01-01 12:45:34.000000000 +0100

+++ gcc/lto-wrapper.c	2017-01-20 16:34:18.294016997 +0100

@@ -52,6 +52,7 @@ along with GCC; see the file COPYING3.

 /* Environment variable, used for passing the names of offload targets from GCC

    driver to lto-wrapper.  */

 #define OFFLOAD_TARGET_NAMES_ENV	"OFFLOAD_TARGET_NAMES"

+#define OFFLOAD_TARGET_DEFAULT_ENV	"OFFLOAD_TARGET_DEFAULT"

 /* By default there is no special suffix for target executables.  */

 #ifdef TARGET_EXECUTABLE_SUFFIX

@@ -906,6 +907,12 @@ compile_offload_image (const char *targe

 	break;

       }

+  if (!compiler && getenv (OFFLOAD_TARGET_DEFAULT_ENV))

+    {

+      free_array_of_ptrs ((void **) paths, n_paths);

+      return NULL;

+    }

+

   if (!compiler)

     fatal_error (input_location,

 		 "could not find %s in %s (consider using %<-B%>)",

@@ -975,6 +982,7 @@ compile_images_for_offload_targets (unsi

   if (!target_names)

     return;

   unsigned num_targets = parse_env_var (target_names, &names, NULL);

+  int next_name_entry = 0;

   const char *compiler_path = getenv ("COMPILER_PATH");

   if (!compiler_path)

@@ -985,13 +993,19 @@ compile_images_for_offload_targets (unsi

   offload_names = XCNEWVEC (char *, num_targets + 1);

   for (unsigned i = 0; i < num_targets; i++)

     {

-      offload_names[i]

+      offload_names[next_name_entry]

 	= compile_offload_image (names[i], compiler_path, in_argc, in_argv,

 				 compiler_opts, compiler_opt_count,

 				 linker_opts, linker_opt_count);

-      if (!offload_names[i])

-	fatal_error (input_location,

-		     "problem with building target image for %s", names[i]);

+      if (!offload_names[next_name_entry])

+	continue;

+      next_name_entry++;

+    }

+

+  if (next_name_entry == 0)

+    {

+      free (offload_names);

+      offload_names = NULL;

     }

  out:

--- libgomp/target.c.jj	2017-01-01 12:45:52.000000000 +0100

+++ libgomp/target.c	2017-01-20 20:12:13.756710875 +0100

@@ -2356,7 +2356,7 @@ gomp_load_plugin_for_device (struct gomp

   void *plugin_handle = dlopen (plugin_name, RTLD_LAZY);

   if (!plugin_handle)

-    goto dl_fail;

+    return 0;

   /* Check if all required functions are available in the plugin and store

      their handlers.  None of the symbols can legitimately be NULL,