multilib: Add support for compiling recipes against multiple ABIs

This patch adds the core multilib class which can be used along with a
parameter specifying the mutlilib to use in BBCLASSEXTEND.

The MLPREFIX variable is added and can be used in cases where its too
difficult to dynmaically work out where a mutltilib prefix is needed
to be added to a variable.

This includes:
  * SHLIBSDIR and PACKAGE_ARCH fixes from Lianhao Lu.
  * PACKAGE_DYNAMIC mapping from Yu Ke
  * PACKAGE_INSTALL mapping from Yu Ke
  * RPROVIDES mapping from Yu Ke
  * TARGET_VENDOR fix from Mark Hatle
  * Ignorning *-native-runtime dependnecies as well as *-native from Yu Ke
  * Map PKG and ALLOW_EMPTY from Dongxiao Xu
  * Ensure RCONFLICTS and PKG field dependencies are remapped (from Dongxiao Xu)
  * Ensure PN and MLPREFIX are set at the same time to ensure consistent BPN values (Yu Ke)

(From OE-Core rev: 5d9453049915db48ec4b5972e12287417ebb61a2)

Signed-off-by: Yu Ke <ke.yu@intel.com>
Signed-off-by: Xu Dongxiao <dongxiao.xu@intel.com>
Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/autotools.bbclass

@@ -9,7 +9,7 @@ def autotools_dep_prepend(d):
 		return deps
 	deps += 'autoconf-native automake-native help2man-native '
 
-	if not pn in ['libtool', 'libtool-native', 'libtool-cross']:
+	if not pn in ['libtool', 'libtool-native'] and not pn.endswith("libtool-cross"):
 		deps += 'libtool-native '
 		if not bb.data.inherits_class('native', d) \
                         and not bb.data.inherits_class('cross', d) \

meta/classes/cross.bbclass

@@ -54,4 +54,3 @@ do_populate_sysroot[sstate-inputdirs] = "${SYSROOT_DESTDIR}/${STAGING_DIR_NATIVE
 do_install () {
 	oe_runmake 'DESTDIR=${D}' install
 }
-

meta/classes/insane.bbclass

@@ -571,12 +571,13 @@ Rerun configure task after fixing this. The path was '%s'""" % root)
 
     cnf = bb.data.getVar('EXTRA_OECONF', d, True) or ""
     if "gettext" not in bb.data.getVar('P', d, True) and "gcc-runtime" not in bb.data.getVar('P', d, True) and "--disable-nls" not in cnf:
+       ml = d.getVar("MLPREFIX", True) or ""
        if bb.data.inherits_class('native', d) or bb.data.inherits_class('cross', d) or bb.data.inherits_class('crosssdk', d) or bb.data.inherits_class('nativesdk', d):
           gt = "gettext-native"
        elif bb.data.inherits_class('cross-canadian', d):
           gt = "gettext-nativesdk"
        else:
-          gt = "virtual/gettext"
+          gt = "virtual/" + ml + "gettext"
        deps = bb.utils.explode_deps(bb.data.getVar('DEPENDS', d, True) or "")
        if gt not in deps:
           for config in configs:

meta/classes/package.bbclass

@@ -168,6 +168,17 @@ python () {
         bb.data.setVarFlag('do_package', 'deptask', " ".join(deps), d)
     else:
         d.setVar("PACKAGERDEPTASK", "")
+
+    multilib_archs = []
+    multilibs= d.getVar('MULTILIBS', True) or ""
+    if multilibs:
+        for ext in multilibs.split():
+            eext = ext.split(':')
+            if len(eext) > 1:
+                if eext[0] == 'multilib':
+                    multilib_archs.append('ml' + eext[1])
+
+    d.setVar("MULTILIB_ARCHS", ' '.join(multilib_archs))
 }
 
 def splitfile(file, debugfile, debugsrcdir, d):