gcc-4.5: Backport cpp honor sysroot patch

This patch is well vetted on gcc-4.6

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>

toolchain-layer/recipes-devtools/gcc/gcc-4.5/cpp-honour-sysroot.patch

@@ -0,0 +1,36 @@
+Currently, if the gcc toolchain is relocated and installed from sstate, then you try and compile
+preprocessed source (.i or .ii files), the compiler will try and access the builtin sysroot location 
+rather than the --sysroot option specified on the commandline. If access to that directory is 
+permission denied (unreadable), gcc will error.
+
+This happens when ccache is in use due to the fact it uses preprocessed source files.
+
+The fix below adds %I to the cpp-output spec macro so the default substitutions for -iprefix, 
+-isystem, -isysroot happen and the correct sysroot is used.
+
+[YOCTO #2074]
+
+Upstream-Status: Pending
+
+RP 2012/04/13
+
+--- a/gcc/gcc.c
++++ b/gcc/gcc.c
+@@ -1106,7 +1106,7 @@ static const struct compiler default_com
+                     %W{o*:--output-pch=%*}%V}}}}}}", 0, 0, 0},
+   {".i", "@cpp-output", 0, 1, 0},
+   {"@cpp-output",
+-   "%{!M:%{!MM:%{!E:cc1 -fpreprocessed %i %(cc1_options) %{!fsyntax-only:%(invoke_as)}}}}", 0, 1, 0},
++   "%{!M:%{!MM:%{!E:cc1 -fpreprocessed %i %I %(cc1_options) %{!fsyntax-only:%(invoke_as)}}}}", 0, 1, 0},
+   {".s", "@assembler", 0, 1, 0},
+   {"@assembler",
+    "%{!M:%{!MM:%{!E:%{!S:as %(asm_debug) %(asm_options) %i %A }}}}", 0, 1, 0},
+--- a/gcc/cp/lang-specs.h
++++ b/gcc/cp/lang-specs.h
+@@ -63,5 +63,5 @@ along with GCC; see the file COPYING3.
+   {".ii", "@c++-cpp-output", 0, 0, 0},
+   {"@c++-cpp-output",
+    "%{!M:%{!MM:%{!E:\
+-    cc1plus -fpreprocessed %i %(cc1_options) %2 %{+e*}\
++    cc1plus -fpreprocessed %i %I %(cc1_options) %2 %{+e*}\
+     %{!fsyntax-only:%(invoke_as)}}}}", 0, 0, 0},