Honor $MAKE for -fwhopr=; do not honor $MAKEFLAGS, $MFLAGS.

gcc/:
	* lto-wrapper.c (run_gcc): Unset MAKEFLAGS and MFLAGS
	before calling make; allow override through $MAKE.
	* doc/invoke.texi (Optimize Options): Document override.

From-SVN: r159760

gcc/ChangeLog

+2010-05-23  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
+
+	* lto-wrapper.c (run_gcc): Unset MAKEFLAGS and MFLAGS
+	before calling make; allow override through $MAKE.
+	* doc/invoke.texi (Optimize Options): Document override.
+
 2010-05-23  Anatoly Sokolov  <aesok@post.ru>
 
 	* config/rs6000/rs6000.c (rs6000_mode_dependent_address_p): New.

gcc/doc/invoke.texi

@@ -7459,7 +7459,8 @@ that otherwise would not fit in memory.  This option enables
 
 If you specify the optional @var{n} the link stage is executed in
 parallel using @var{n} parallel jobs by utilizing an installed
-@code{make} program.
+@command{make} program.  The environment variable @env{MAKE} may be
+used to override the program used.
 
 Disabled by default.
 

gcc/lto-wrapper.c

@@ -521,7 +521,12 @@ cont:
 	    fprintf (mstream, " \\\n\t%s", output_names[i]);
 	  fprintf (mstream, "\n");
 	  fclose (mstream);
-	  new_argv[0] = "make";
+	  /* Avoid passing --jobserver-fd= and similar flags.  */
+	  putenv (xstrdup ("MAKEFLAGS="));
+	  putenv (xstrdup ("MFLAGS="));
+	  new_argv[0] = getenv ("MAKE");
+	  if (!new_argv[0])
+	    new_argv[0] = "make";
 	  new_argv[1] = "-f";
 	  new_argv[2] = makefile;
 	  snprintf (jobs, 31, "-j%d", parallel);