More external toolchain fixes/improvements

index 79fef25..d5abc16 100644
@@ -42,24 +42,39 @@ ENABLE_BINARY_LOCALE_GENERATION = ""
 
 TOOLCHAIN_OPTIONS = " --sysroot=${STAGING_DIR_HOST}"
 
-# Translate to CodeSourcery's names for their optimized files in the toolchain
-def csl_target_core(d):
-    coredata = {
-        'armv7a-vfp-neon': 'armv7-a-neon',
-        'i586': 'sgxx-glibc',
-        'i686': 'sgxx-glibc',
-        'core2': 'sgxx-glibc',
-        'mips': 'mips32',
-        'mipsel': 'el',
-        'powerpc-nf': 'nof',
-        'ppce500': 'te500v1',
-        'ppce500mc': 'te500mc',
-        'ppce500v2': 'te500v2',
-        'ppce600': 'te600'
-    }
-    return coredata.get(d.getVar('TUNE_PKGARCH', True), '')
-
-CSL_TARGET_CORE ?= "${@csl_target_core(d)}"
+# Point to the appropriate multilib sysroot from the external toolchain, whose
+# files will be extracted into the OE sysroot
+def exttc_run(d, cmd):
+    try:
+        return bb.process.run(cmd, shell=True, env={'PATH': d.getVar('PATH', True)})[0].rstrip()
+    except (OSError, bb.process.CmdError):
+        return ''
+
+EXTERNAL_TOOLCHAIN_SYSROOT_CMD = "${TARGET_PREFIX}gcc ${TARGET_CC_ARCH} -print-sysroot"
+EXTERNAL_TOOLCHAIN_SYSROOT ??= "${@exttc_run(d, EXTERNAL_TOOLCHAIN_SYSROOT_CMD)}"
+
+# These bits are here temporarily to sidestep the need to use a separate set
+# of tune files to pass the appropriate multilib selection arguments to the
+# sourcery toolchain, as is needed to extract the sysroot content.
+CSL_MULTILIB_ARGS[i586] = "-msgxx-glibc"
+CSL_MULTILIB_ARGS[i686] = "-msgxx-glibc"
+CSL_MULTILIB_ARGS[core2] = "-msgxx-glibc"
+CSL_MULTILIB_ARGS[x86] = "-msgxx-glibc"
+CSL_MULTILIB_ARGS[x86-64] = "-msgxx-glibc"
+CSL_MULTILIB_ARGS[ppce500] = "-te500v1"
+CSL_MULTILIB_ARGS[ppce500mc] = "-te500mc"
+CSL_MULTILIB_ARGS[ppce500v2] = "-te500v2"
+CSL_MULTILIB_ARGS[ppce600] = "-te600"
+
+def csl_multilib_arg(d):
+    argument = d.getVarFlag('CSL_MULTILIB_ARGS', d.getVar('DEFAULTTUNE', True) or '')
+    if argument:
+        return argument
+    else:
+        return ''
+
+EXTERNAL_TOOLCHAIN_SYSROOT_CMD += "${@csl_multilib_arg(d)}"
+
 
 # Unfortunately, the CSL ia32 toolchain has non-prefixed binaries in its
 # bindir (e.g. gcc, ld). To avoid this messing up our build, we avoid adding

index b8cb6d9..b67410b 100644
@@ -24,7 +24,7 @@ PROVIDES += "\
 	virtual/linux-libc-headers \
 "
 PV = "${CSL_VER_MAIN}"
-PR = "r5"
+PR = "r6"
 
 #SRC_URI = "http://www.codesourcery.com/public/gnu_toolchain/${CSL_TARGET_SYS}/arm-${PV}-${TARGET_PREFIX}i686-pc-linux-gnu.tar.bz2"
 

@@ -32,10 +32,7 @@ SRC_URI = "file://SUPPORTED"
 
 do_install() {
 	# Use optimized files if available
-	sysroot="${EXTERNAL_TOOLCHAIN}/${CSL_TARGET_SYS}/libc"
-	if [ -d $sysroot/${CSL_TARGET_CORE} ]; then
-		sysroot="$sysroot/${CSL_TARGET_CORE}"
-	fi
+	sysroot="${EXTERNAL_TOOLCHAIN_SYSROOT}"
 
 	cp -a $sysroot${base_libdir}/. ${D}${base_libdir}
 	cp -a $sysroot/etc/. ${D}${sysconfdir}

@@ -76,15 +73,11 @@ do_install() {
 
 SYSROOT_PREPROCESS_FUNCS += "external_toolchain_sysroot_adjust"
 external_toolchain_sysroot_adjust() {
-       if [ -n "${CSL_TARGET_CORE}" ]; then
-               rm -f ${SYSROOT_DESTDIR}/${CSL_TARGET_CORE}
-               ln -s . ${SYSROOT_DESTDIR}/${CSL_TARGET_CORE}
-       fi
-
-       if [ "${TUNE_PKGARCH}" = "i586" ]; then
-               rm -f ${SYSROOT_DESTDIR}/system32
-               ln -s . ${SYSROOT_DESTDIR}/system32
-       fi
+	dest_sysroot="$(${CC} -print-sysroot | sed -e's,^${STAGING_DIR_HOST},,; s,/$,,')"
+	if [ -n "$dest_sysroot" ]; then
+		rm -f ${SYSROOT_DESTDIR}/$dest_sysroot
+		ln -s . ${SYSROOT_DESTDIR}/$dest_sysroot
+	fi
 }
 
 PACKAGES =+ "libgcc libgcc-dev libstdc++ libstdc++-dev libstdc++-staticdev linux-libc-headers linux-libc-headers-dev gdbserver gdbserver-dbg"

index d5abc16..834a4d9 100644
@@ -56,11 +56,8 @@ EXTERNAL_TOOLCHAIN_SYSROOT ??= "${@exttc_run(d, EXTERNAL_TOOLCHAIN_SYSROOT_CMD)}
 # These bits are here temporarily to sidestep the need to use a separate set
 # of tune files to pass the appropriate multilib selection arguments to the
 # sourcery toolchain, as is needed to extract the sysroot content.
-CSL_MULTILIB_ARGS[i586] = "-msgxx-glibc"
-CSL_MULTILIB_ARGS[i686] = "-msgxx-glibc"
-CSL_MULTILIB_ARGS[core2] = "-msgxx-glibc"
-CSL_MULTILIB_ARGS[x86] = "-msgxx-glibc"
-CSL_MULTILIB_ARGS[x86-64] = "-msgxx-glibc"
+TUNE_CCARGS_append_x86 = " -msgxx-glibc"
+
 CSL_MULTILIB_ARGS[ppce500] = "-te500v1"
 CSL_MULTILIB_ARGS[ppce500mc] = "-te500mc"
 CSL_MULTILIB_ARGS[ppce500v2] = "-te500v2"

index b67410b..74c82ec 100644
@@ -24,7 +24,7 @@ PROVIDES += "\
 	virtual/linux-libc-headers \
 "
 PV = "${CSL_VER_MAIN}"
-PR = "r6"
+PR = "r7"
 
 #SRC_URI = "http://www.codesourcery.com/public/gnu_toolchain/${CSL_TARGET_SYS}/arm-${PV}-${TARGET_PREFIX}i686-pc-linux-gnu.tar.bz2"
 

@@ -78,6 +78,10 @@ external_toolchain_sysroot_adjust() {
 		rm -f ${SYSROOT_DESTDIR}/$dest_sysroot
 		ln -s . ${SYSROOT_DESTDIR}/$dest_sysroot
 	fi
+
+	# If the usr/lib directory doesn't exist, the toolchain fails to even
+	# try to find crti.o in a completely different directory (usr/lib64)
+	install -d ${SYSROOT_DESTDIR}/usr/lib
 }
 
 PACKAGES =+ "libgcc libgcc-dev libstdc++ libstdc++-dev libstdc++-staticdev linux-libc-headers linux-libc-headers-dev gdbserver gdbserver-dbg"