initial buildroot for linux 5.15

package/flatcc/Config.in

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+config BR2_PACKAGE_FLATCC
+	bool "flatcc"
+	help
+	  flatcc is C language implementation of Google Flatbuffers. It
+	  consists of both a library for the target as well as a
+	  flatbuffer compiler tool for the host.
+
+	  https://github.com/dvidelabs/flatcc

package/flatcc/flatcc.hash

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+# Locally calculated
+sha256	a92da3566d11e19bb807a83554b1a2c644a5bd91c9d9b088514456bb56e1c666  flatcc-0.6.0.tar.gz
+sha256	c8f0d9c1f92c658d87ebd854ee7447a3d3912d2c3a5c78c117787be5d5da8af3  LICENSE

package/flatcc/flatcc.mk

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+################################################################################
+#
+# FLATCC
+#
+################################################################################
+
+FLATCC_VERSION = 0.6.0
+FLATCC_SITE = $(call github,dvidelabs,flatcc,v$(FLATCC_VERSION))
+FLATCC_LICENSE = Apache-2.0
+FLATCC_LICENSE_FILES = LICENSE
+FLATCC_INSTALL_STAGING = YES
+FLATCC_DEPENDENCIES = host-flatcc
+FLATCC_CONF_OPTS = -DFLATCC_ALLOW_WERROR=OFF
+HOST_FLATCC_CONF_OPTS = -DFLATCC_ALLOW_WERROR=OFF
+
+# Disable build of tests and samples
+FLATCC_CONF_OPTS += -DFLATCC_TEST=OFF
+HOST_FLATCC_CONF_OPTS += -DFLATCC_TEST=OFF
+
+# Enable install targets
+FLATCC_CONF_OPTS += -DFLATCC_INSTALL=ON
+HOST_FLATCC_CONF_OPTS += -DFLATCC_INSTALL=ON
+
+# compiler is named flatcc or flatcc_d depending on BR2_ENABLE_DEBUG value
+define FLATCC_TARGET_REMOVE_FLATCC_COMPILER
+	rm $(TARGET_DIR)/usr/bin/flatcc*
+endef
+
+FLATCC_POST_INSTALL_TARGET_HOOKS += FLATCC_TARGET_REMOVE_FLATCC_COMPILER
+
+$(eval $(cmake-package))
+$(eval $(host-cmake-package))