initial buildroot for linux 5.15

package/eigen/Config.in

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+config BR2_PACKAGE_EIGEN
+	bool "eigen"
+	depends on BR2_INSTALL_LIBSTDCPP
+	help
+	  Eigen is a C++ template library for linear algebra: vectors,
+	  matrices, and related algorithms. It is versatile, fast,
+	  elegant and works on many platforms (OS/Compilers).
+
+	  This package only installs header files to the include path.
+	  If you just want to use Eigen, you can use the header files
+	  right away. There is no binary to link to. Eigen is a pure
+	  template library defined in the headers.
+
+	  http://eigen.tuxfamily.org/
+
+comment "eigen needs a toolchain w/ C++"
+	depends on !BR2_INSTALL_LIBSTDCPP

package/eigen/eigen.hash

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+# Locally computed
+sha256  685adf14bd8e9c015b78097c1dc22f2f01343756f196acdc76a678e1ae352e11  eigen-3.3.7.tar.bz2
+sha256  4f877e5ae4672568ef82cfd0023e2cef4a7cf55d867ab249efc9569a7eb9e5b1  COPYING.BSD
+sha256  8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING.GPL
+sha256  dc626520dcd53a22f727af3ee42c770e56c97a64fe3adb063799d8ab032fe551  COPYING.LGPL
+sha256  f5b330efdad110cdd84d585ec61220b0650461fa599e36b13e1726c9346dcfb9  COPYING.MINPACK
+sha256  fab3dd6bdab226f1c08630b1dd917e11fcb4ec5e1e020e2c16f83a0a13863e85  COPYING.MPL2
+sha256  c83230b770f17ef1386ea1fd3681271dd98aa93646bdbfb5bff3a1b7050fff9d  COPYING.README

package/eigen/eigen.mk

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+################################################################################
+#
+# eigen
+#
+################################################################################
+
+EIGEN_VERSION = 3.3.7
+EIGEN_SOURCE = eigen-$(EIGEN_VERSION).tar.bz2
+EIGEN_SITE = $(call gitlab,libeigen,eigen,$(EIGEN_VERSION))
+EIGEN_LICENSE = MPL2, BSD-3-Clause, LGPL-2.1
+EIGEN_LICENSE_FILES = COPYING.MPL2 COPYING.BSD COPYING.LGPL COPYING.README
+EIGEN_INSTALL_STAGING = YES
+EIGEN_INSTALL_TARGET = NO
+EIGEN_SUPPORTS_IN_SOURCE_BUILD = NO
+
+# Default Eigen CMake installs .pc file in /usr/share/pkgconfig
+# change it to /usr/lib/pkgconfig, to be consistent with other packages.
+EIGEN_CONF_OPTS = -DPKGCONFIG_INSTALL_DIR=/usr/lib/pkgconfig \
+	-DCMAKE_Fortran_COMPILER=$(TARGET_FC)
+
+$(eval $(cmake-package))