initial buildroot for linux 5.15

package/libbson/Config.in

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+config BR2_PACKAGE_LIBBSON
+	bool "libbson"
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	help
+	  libbson is a library providing useful routines related to
+	  building, parsing, and iterating BSON documents.
+
+	  http://mongoc.org/libbson/
+
+comment "libbson needs a toolchain w/ threads"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS

package/libbson/libbson.hash

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+# Locally calculated
+sha256	6bb51b863a4641d6d7729e4b55df8f4389ed534c34eb3a1cda906a53df11072c libbson-1.9.5.tar.gz
+sha256	cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30 COPYING
+sha256	8dc5cb3146b026715e6c145621c7732f36c295d825b7b3a03076ad3f238db48e THIRD_PARTY_NOTICES

package/libbson/libbson.mk

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+################################################################################
+#
+# libbson
+#
+################################################################################
+
+LIBBSON_VERSION = 1.9.5
+LIBBSON_SITE = https://github.com/mongodb/libbson/releases/download/$(LIBBSON_VERSION)
+LIBBSON_LICENSE = Apache-2.0, MIT (jsonl), ISC (b64), Zlib (md5)
+LIBBSON_LICENSE_FILES = COPYING THIRD_PARTY_NOTICES
+LIBBSON_CPE_ID_VENDOR = mongodb
+LIBBSON_CONF_OPTS = \
+	--disable-tests \
+	--disable-examples \
+	--disable-man-pages \
+	--disable-html-docs
+
+LIBBSON_INSTALL_STAGING = YES
+
+# Also has CMake support, but that forces shared+static libs and static
+# lib has a different name.
+$(eval $(autotools-package))