[PATCH] Fix PR50293 - LTO plugin with space in path

["Joey Ye" <joey dot ye at arm dot com>]

Mainline and 4.7 failed to use LTO when toolchain is installed to a path
with space in it. Resulting in error message like:

xxxx/ld.exe: c:/program: error loading plugin
collect2.exe: error: ld returned 1 exit status

Root cause is when GCC driver process specs, it doesn't handle plugin file
name properly. Here is a patch fixing it.

Bootstraped and make check on x86 and aarch32, no regression.

OK to trunk and 4.7?

ChangeLog:

	PR lto/50293
	* gcc.c (convert_white_space): New function.
	(main): Handles white space in function name.

Index: gcc/gcc.c
===================================================================
--- gcc/gcc.c   (revision 195189)
+++ gcc/gcc.c   (working copy)
@@ -265,6 +265,7 @@
 static const char *compare_debug_auxbase_opt_spec_function (int, const char
**);
 static const char *pass_through_libs_spec_func (int, const char **);
 static const char *replace_extension_spec_func (int, const char **);
+static char * convert_white_space(char * orig);


 /* The Specs Language

@@ -6595,6 +6596,7 @@
                                    X_OK, false);
   if (lto_wrapper_file)
     {
+      lto_wrapper_file = convert_white_space(lto_wrapper_file);
       lto_wrapper_spec = lto_wrapper_file;
       obstack_init (&collect_obstack);
       obstack_grow (&collect_obstack, "COLLECT_LTO_WRAPPER=",
@@ -7005,12 +7007,13 @@
                              + strlen (fuse_linker_plugin), 0))
 #endif
            {
-             linker_plugin_file_spec = find_a_file (&exec_prefixes,
+             char * temp_spec = find_a_file (&exec_prefixes,
                                                     LTOPLUGINSONAME, R_OK,
                                                     false);
-             if (!linker_plugin_file_spec)
+             if (!temp_spec)
                fatal_error ("-fuse-linker-plugin, but %s not found",
                             LTOPLUGINSONAME);
+             linker_plugin_file_spec = convert_white_space(temp_spec);
            }
 #endif
          lto_gcc_spec = argv[0];
@@ -8506,3 +8509,30 @@
   free (name);
   return result;
 }
+
+/* Insert back slash before spaces in a string, to avoid path
+   that has space in it broken into multiple arguments.  */
+
+static char * convert_white_space(char * orig)
+{
+  int len, number_of_space = 0;
+  char *p = orig;
+  if (orig == NULL) return NULL;
+
+  for (len=0; p[len]; len++)
+    if (p[len] == ' ' || p[len] == '\t') number_of_space ++;
+
+  if (number_of_space)
+    {
+      char * new_spec = (char *)xmalloc(len + number_of_space + 1);
+      int j,k;
+      for (j=0, k=0; j<=len; j++, k++)
+       {
+         if (p[j] == ' ' || p[j] == '\t') new_spec[k++]='\\';
+         new_spec[k] = p[j];
+       }
+      free(CONST_CAST(char *, orig));
+      return new_spec;
+  }
+  else return orig;
+}