gcc: enable multilib for target gcc

- add a task to setup multilib configuration for target gcc
- this commit adapts Nitin Kamble's work to gcc 4.7
- use a hash for storing arch-dependent multilib options
- patch gcc in order to use the multilib config files from the
build directory

Tests:
root@qemux86-64:~# gcc -m64 t.c -o t
root@qemux86-64:~# file t
t: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.16, not stripped
root@qemux86-64:~# ./t
Hello World !
root@qemux86-64:~# gcc -m32 t.c -o t
root@qemux86-64:~# file t
t: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.16, not stripped
root@qemux86-64:~# ./t
Hello World !

[YOCTO #1369]

(From OE-Core rev: b26819c85881e82ee1b5c68840011e78c321f18e)

Signed-off-by: Constantin Musca <constantinx.musca@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 87 insertions, 0 deletions

diff --git a/meta/recipes-devtools/gcc/gcc-4.7/use-ml-conf-files-from-B.patch b/meta/recipes-devtools/gcc/gcc-4.7/use-ml-conf-files-from-B.patch
new file mode 100644
index 0000000000..4d229247a4
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc-4.7/use-ml-conf-files-from-B.patch
@@ -0,0 +1,87 @@
+Use the multilib config files from ${B} instead of using the ones from ${S}
+so that the source can be shared between gcc-cross-initial,
+gcc-cross-intermediate, gcc-cross, gcc-runtime, and also the sdk build.
+
+Upstream-Status: Inappropriate [configuration]
+Signed-off-by: Constantin Musca <constantinx.musca@intel.com>
+
+Index: gcc-4.7.2/gcc/configure
+===================================================================
+--- gcc-4.7.2.orig/gcc/configure
++++ gcc-4.7.2/gcc/configure
+@@ -11717,10 +11717,20 @@ done
+ tmake_file_=
+ for f in ${tmake_file}
+ do
+-       if test -f ${srcdir}/config/$f
+-       then
+-               tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
+-       fi
++  case $f in
++    */t-linux64 )
++       if test -f ./config/$f
++       then
++         tmake_file_="${tmake_file_} ./config/$f"
++       fi
++       ;;
++    * )
++       if test -f ${srcdir}/config/$f
++       then
++         tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
++       fi
++       ;;
++  esac
+ done
+ tmake_file="${tmake_file_}"
+ 
+@@ -11731,6 +11741,10 @@ tm_file_list="options.h"
+ tm_include_list="options.h insn-constants.h"
+ for f in $tm_file; do
+   case $f in
++    */linux64.h )
++       tm_file_list="${tm_file_list} ./config/$f"
++       tm_include_list="${tm_include_list} ./config/$f"
++       ;;
+     ./* )
+        f=`echo $f | sed 's/^..//'`
+        tm_file_list="${tm_file_list} $f"
+Index: gcc-4.7.2/gcc/configure.ac
+===================================================================
+--- gcc-4.7.2.orig/gcc/configure.ac
++++ gcc-4.7.2/gcc/configure.ac
+@@ -1701,10 +1701,20 @@ done
+ tmake_file_=
+ for f in ${tmake_file}
+ do
+-       if test -f ${srcdir}/config/$f
+-       then
+-               tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
+-       fi
++  case $f in
++    */t-linux64 )
++       if test -f ./config/$f
++       then
++         tmake_file_="${tmake_file_} ./config/$f"
++       fi
++       ;;
++    * )
++       if test -f ${srcdir}/config/$f
++       then
++         tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
++       fi
++       ;;
++  esac
+ done
+ tmake_file="${tmake_file_}"
+ 
+@@ -1715,6 +1725,10 @@ tm_file_list="options.h"
+ tm_include_list="options.h insn-constants.h"
+ for f in $tm_file; do
+   case $f in
++    */linux64.h )
++       tm_file_list="${tm_file_list} ./config/$f"
++       tm_include_list="${tm_include_list} ./config/$f"
++       ;;
+     ./* )
+        f=`echo $f | sed 's/^..//'`
+        tm_file_list="${tm_file_list} $f"