gcc.c (spec_function): Add remove-outfile.

2010-08-17  Jack Howarth <howarth@bromo.med.uc.edu>

	* gcc.c (spec_function): Add remove-outfile.
	(remove_outfile_spec_function): New function.
	* config/darwin.h (LINK_SPEC): Add removal of
	-ldl, -lm and -lpthread.
	* invoke.texi (replace-outfile): Document.

From-SVN: r163305

gcc/ChangeLog

+2010-08-17  Jack Howarth <howarth@bromo.med.uc.edu>
+
+	* gcc.c (spec_function): Add remove-outfile.
+	(remove_outfile_spec_function): New function.
+	* config/darwin.h (LINK_SPEC): Add removal of
+	-ldl, -lm and -lpthread.
+	* invoke.texi (replace-outfile): Document.
+
 2010-08-17  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/45296

gcc/config/darwin.h

@@ -303,6 +303,9 @@ extern GTY(()) int darwin_ms_struct;
    so put a * after their names so all of them get passed.  */
 #define LINK_SPEC  \
   "%{static}%{!static:-dynamic} \
+   %:remove-outfile(-ldl) \
+   %:remove-outfile(-lm) \
+   %:remove-outfile(-lpthread) \
    %{fgnu-runtime: %{static|static-libgcc: \
                      %:replace-outfile(-lobjc libobjc-gnu.a%s); \
                     :%:replace-outfile(-lobjc -lobjc-gnu ) } }\

gcc/doc/invoke.texi

@@ -9629,6 +9629,15 @@ is a small example of its usage:
 %@{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)@}
 @end smallexample
 
+@item @code{remove-outfile}
+The @code{remove-outfile} spec function takes one argument.  It looks for the
+first argument in the outfiles array and removes it.  Here is a small example
+its usage:
+
+@smallexample
+%:remove-outfile(-lm)
+@end smallexample
+
 @item @code{print-asm-header}
 The @code{print-asm-header} function takes no arguments and simply
 prints a banner like:

gcc/gcc.c

@@ -317,6 +317,7 @@ static const char *getenv_spec_function (int, const char **);
 static const char *if_exists_spec_function (int, const char **);
 static const char *if_exists_else_spec_function (int, const char **);
 static const char *replace_outfile_spec_function (int, const char **);
+static const char *remove_outfile_spec_function (int, const char **);
 static const char *version_compare_spec_function (int, const char **);
 static const char *include_spec_function (int, const char **);
 static const char *find_file_spec_function (int, const char **);
@@ -1615,6 +1616,7 @@ static const struct spec_function static_spec_functions[] =
   { "if-exists",		if_exists_spec_function },
   { "if-exists-else",		if_exists_else_spec_function },
   { "replace-outfile",		replace_outfile_spec_function },
+  { "remove-outfile",		remove_outfile_spec_function },
   { "version-compare",		version_compare_spec_function },
   { "include",			include_spec_function },
   { "find-file",		find_file_spec_function },
@@ -8274,6 +8276,27 @@ replace_outfile_spec_function (int argc, const char **argv)
   return NULL;
 }
 
+/* remove-outfile built-in spec function.
+ *
+ *    This looks for the first argument in the outfiles array's name and
+ *       removes it.  */
+
+static const char *
+remove_outfile_spec_function (int argc, const char **argv)
+{
+  int i;
+  /* Must have exactly one argument.  */
+  if (argc != 1)
+    abort ();
+
+  for (i = 0; i < n_infiles; i++)
+    {
+      if (outfiles[i] && !strcmp (outfiles[i], argv[0]))
+        outfiles[i] = NULL;
+    }
+  return NULL;
+}
+
 /* Given two version numbers, compares the two numbers.
    A version number must match the regular expression
    ([1-9][0-9]*|0)(\.([1-9][0-9]*|0))*