initial buildroot for linux 5.15

package/cctz/Config.in

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+config BR2_PACKAGE_CCTZ
+	bool "cctz"
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # C++11
+	select BR2_TARGET_TZ_INFO # runtime dependency
+	help
+	  CCTZ is a C++ library for translating between absolute
+	  and civil times using the rules of a time zone.
+
+	  https://github.com/google/cctz
+
+if BR2_PACKAGE_CCTZ
+
+config BR2_PACKAGE_CCTZ_INSTALL_TOOLS
+	bool "Install tools"
+	help
+	  This option allows installing CCTZ tools.
+
+config BR2_PACKAGE_CCTZ_INSTALL_EXAMPLES
+	bool "Install example programs"
+	help
+	  This option allows installing CCTZ example programs.
+
+endif
+
+comment "cctz needs a toolchain w/ C++, threads, gcc >= 4.8"
+	depends on !BR2_INSTALL_LIBSTDCPP || \
+		!BR2_TOOLCHAIN_HAS_THREADS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8

package/cctz/cctz.hash

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+# locally computed
+sha256 8615b20d4e33e02a271c3b93a3b208e3d7d5d66880f5f6208b03426e448f32db cctz-2.3.tar.gz
+sha256 c79a7fea0e3cac04cd43f20e7b648e5a0ff8fa5344e644b0ee09ca1162b62747 LICENSE.txt

package/cctz/cctz.mk

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+################################################################################
+#
+# cctz
+#
+################################################################################
+
+CCTZ_VERSION = 2.3
+CCTZ_SITE = $(call github,google,cctz,v$(CCTZ_VERSION))
+CCTZ_LICENSE = Apache-2.0
+CCTZ_LICENSE_FILES = LICENSE.txt
+CCTZ_INSTALL_STAGING = YES
+
+CCTZ_CONF_OPTS = -DBUILD_TESTING=OFF
+
+ifeq ($(BR2_PACKAGE_CCTZ_INSTALL_TOOLS),y)
+CCTZ_CONF_OPTS += -DBUILD_TOOLS=ON
+else
+CCTZ_CONF_OPTS += -DBUILD_TOOLS=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_CCTZ_INSTALL_EXAMPLES),y)
+CCTZ_CONF_OPTS += -DBUILD_EXAMPLES=ON
+else
+CCTZ_CONF_OPTS += -DBUILD_EXAMPLES=OFF
+endif
+
+$(eval $(cmake-package))