Fix -save-temp leaking lto files in /tmp

When linking with -flto and -save-temps, various
temporary files are created in /tmp.
The same happens when invoking the driver with @file
parameter, and using -L or -I options.

gcc:
2021-01-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>

	* collect-utils.c (collect_execute): Check dumppfx.
	* collect2.c (maybe_run_lto_and_relink, do_link): Pass atsuffix
	to collect_execute.
	(do_link): Add new parameter atsuffix.
	(main): Handle -dumpdir option.  Skip one argument for
	-o, -isystem and -B options.
	* gcc.c (make_at_file): New helper function.
	(close_at_file): Use it.

gcc/testsuite:
2021-01-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>

	* gcc.misc-tests/outputs.exp: Adjust testcase.

1 files changed, 27 insertions, 1 deletions

diff --git a/gcc/gcc.c b/gcc/gcc.c
index 42077fb..79084c3 100644
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -2196,6 +2196,32 @@ open_at_file (void)
      in_at_file = true;
 }
 
+/* Create a temporary @file name.  */
+
+static char *make_at_file (void)
+{
+  static int fileno = 0;
+  char filename[20];
+  const char *base, *ext;
+
+  if (!save_temps_flag)
+    return make_temp_file ("");
+
+  base = dumpbase;
+  if (!(base && *base))
+    base = dumpdir;
+  if (!(base && *base))
+    base = "a";
+
+  sprintf (filename, ".args.%d", fileno++);
+  ext = filename;
+
+  if (base == dumpdir && dumpdir_trailing_dash_added)
+    ext++;
+
+  return concat (base, ext, NULL);
+}
+
 /* Close the temporary @file and add @file to the argument list.  */
 
 static void
@@ -2211,7 +2237,7 @@ close_at_file (void)
     return;
 
   char **argv = (char **) alloca (sizeof (char *) * (n_args + 1));
-  char *temp_file = make_temp_file ("");
+  char *temp_file = make_at_file ();
   char *at_argument = concat ("@", temp_file, NULL);
   FILE *f = fopen (temp_file, "w");
   int status;