initial buildroot for linux 5.15

package/libtool/Config.in

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+config BR2_PACKAGE_LIBTOOL
+	bool "libtool"
+	help
+	  Library that hides the complexity of using shared/static
+	  libraries on different platforms behind a consistent, portable
+	  interface.
+
+	  http://www.gnu.org/software/libtool/

package/libtool/libtool.hash

@@ -0,0 +1,5 @@
+# Locally calculated after checking pgp signature
+sha256	7c87a8c2c8c0fc9cd5019e402bed4292462d00a718a7cd5f11218153bf28b26f	libtool-2.4.6.tar.xz
+# License files, locally calculated
+sha256	8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643	COPYING
+sha256	dc626520dcd53a22f727af3ee42c770e56c97a64fe3adb063799d8ab032fe551	libltdl/COPYING.LIB

package/libtool/libtool.mk

@@ -0,0 +1,56 @@
+################################################################################
+#
+# libtool
+#
+################################################################################
+
+LIBTOOL_VERSION = 2.4.6
+LIBTOOL_SOURCE = libtool-$(LIBTOOL_VERSION).tar.xz
+LIBTOOL_SITE = $(BR2_GNU_MIRROR)/libtool
+LIBTOOL_CPE_ID_VENDOR = gnu
+
+# For the target variant, we only want to build/install libltdl
+LIBTOOL_SUBDIR = libltdl
+HOST_LIBTOOL_SUBDIR = .
+
+LIBTOOL_INSTALL_STAGING = YES
+
+LIBTOOL_CONF_OPTS = --enable-ltdl-install
+
+LIBTOOL_DEPENDENCIES = host-m4
+HOST_LIBTOOL_DEPENDENCIES = host-m4
+
+LIBTOOL_LICENSE = LGPL-2.1+
+LIBTOOL_LICENSE_FILES = $(LIBTOOL_SUBDIR)/COPYING.LIB
+HOST_LIBTOOL_LICENSE = GPL-2.0+ (libtool), LGPL-2.1+ (libltdl)
+HOST_LIBTOOL_LICENSE_FILES = COPYING $(LIBTOOL_SUBDIR)/COPYING.LIB
+
+HOST_LIBTOOL_CONF_ENV = MAKEINFO=true
+HOST_LIBTOOL_LIBTOOL_PATCH = NO
+
+# We have a patch that affects libtool.m4, which triggers an autoreconf
+# in the build step. Normally we would set AUTORECONF = YES, but this
+# doesn't work for host-libtool because that creates a circular
+# dependency. Instead, touch the generated files so autoreconf is not
+# triggered in the build step. Note that aclocal.m4 has to be touched
+# first since the rest depends on it. Note that we don't need the changes
+# in libtool.m4 in our configure script, because we're not actually
+# running it on the target.
+# For the target, we would normally be able to use AUTORECONF, but it
+# fails on libltdl/Makefile.inc. Rather than trying to fix that failure,
+# just use the same hack as on the host.
+define LIBTOOL_AVOID_AUTORECONF_HOOK
+	find $(@D) -name aclocal.m4 -exec touch '{}' \;
+	find $(@D) -name config-h.in -exec touch '{}' \;
+	find $(@D) -name configure -exec touch '{}' \;
+	find $(@D) -name Makefile.in -exec touch '{}' \;
+endef
+LIBTOOL_PRE_CONFIGURE_HOOKS += LIBTOOL_AVOID_AUTORECONF_HOOK
+HOST_LIBTOOL_PRE_CONFIGURE_HOOKS += LIBTOOL_AVOID_AUTORECONF_HOOK
+
+$(eval $(autotools-package))
+$(eval $(host-autotools-package))
+
+# variables used by other packages
+LIBTOOL = $(HOST_DIR)/bin/libtool
+LIBTOOLIZE = $(HOST_DIR)/bin/libtoolize