* Ensure that when building gcc, libstdc++ is linked against the

libgcc of the gcc being built, not the gcc building it.
* Only include a directory in the rpath of an executable/library if it
  is actually used.  Before, the `/lib' directory of every build input
  was added to the rpath, causing many unnecessary retained
  dependencies.  For instance, Perl has a `/lib' directory, but most
  applications whose build process uses Perl don't actually link
  against Perl.  (Also added a test for this.)
* After building glibc, remove glibcbug, to prevent a retained
  dependency on gcc.
* Add a newline after `building X' in GNU Make.

svn path=/nixpkgs/trunk/; revision=911

pkgs/test/rpath/src/hello1.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main(int argc, char * * argv)
+{
+    printf("Hello World!\n");
+    return 0;
+}

pkgs/test/rpath/src/hello2.cc

@@ -0,0 +1,7 @@
+#include <iostream>
+
+int main(int argc, char * * argv)
+{
+    std::cout << "Hello World!\n";
+    return 0;
+}

pkgs/test/rpath/src/hello3.c

@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+char * text();
+
+int main(int argc, char * * argv)
+{
+    printf(text());
+    return 0;
+}

pkgs/test/rpath/src/text.c

@@ -0,0 +1,4 @@
+char * text()
+{
+    return "Hello World!\n";
+}