gcc-cross-initial: Stage self sufficient fixed limits.h

currently gcc installs a limits.h which references to another
limits.h which it expects from target sysroot and that header
in target sysroot will come from eglibc. So we need to break
this catch-22 and hence we install a self sufficient limits.h
which is then happy when referenced and doesnt complain about
missing limits.h from target sysroot.

This is mostly used when eglibc-initial configure is run

(From OE-Core rev: eeb445ecbc651ad614a4fc492039bdad0747d45d)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/gcc/gcc-4.7.inc

@@ -1,6 +1,6 @@
 require gcc-common.inc
 
-PR = "r7"
+PR = "r8"
 
 # Third digit in PV should be incremented after a minor release
 # happens from this branch on gcc e.g. currently its 4.7.1

meta/recipes-devtools/gcc/gcc-cross-initial.inc

@@ -27,3 +27,13 @@ EXTRA_OECONF = "--with-newlib \
 do_compile () {
     oe_runmake all-gcc all-target-libgcc
 }
+# fixed limits.h infact includes the so called real limits.h
+# which should come from libc but when we build libc-initial
+# then bunch of configure tests include fixed limits.h which in turn
+# includes real limits.h but this real limits.h is not staged yet
+# so we overwirte the generated include-fixed/limits.h for gcc-cross-initial
+# to get rid references to real limits.h
+
+do_install_append1() {
+    cp gcc/include-fixed/limits.h ${D}${gcclibdir}/${TARGET_SYS}/${BINV}/include-fixed/limits.h
+}