initial buildroot for linux 5.15

package/libmdbx/Config.in

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+config BR2_PACKAGE_LIBMDBX
+	bool "libmdbx"
+	depends on BR2_USE_MMU
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
+	help
+	  One of the fastest compact key-value ACID database
+	  without WAL. libmdbx has a specific set of properties
+	  and capabilities, focused on creating unique lightweight
+	  solutions.
+
+	  libmdbx surpasses the legendary LMDB in terms of
+	  reliability, features and performance.
+
+	  https://github.com/erthink/libmdbx
+
+if BR2_PACKAGE_LIBMDBX
+
+config BR2_PACKAGE_LIBMDBX_TOOLS
+	bool "install tools"
+	help
+	  Install libmdbx tools for checking, dump, restore
+	  and show statistics of databases.
+
+config BR2_PACKAGE_LIBMDBX_CXX
+	bool "C++ API"
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
+	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735
+	help
+	  Enable modern C++11/14/17/20 API for libmdbx.
+
+comment "libmdbx C++ support needs a toolchain w/ C++11, gcc >= 4.8 w/o bug#64735"
+	depends on !BR2_INSTALL_LIBSTDCPP || \
+		!BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 || \
+		BR2_TOOLCHAIN_HAS_GCC_BUG_64735
+
+endif
+
+comment "libmdbx needs MMU, a toolchain w/ threads, gcc >= 4.4 w/ 4-byte atomics"
+	depends on BR2_USE_MMU
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || \
+		!BR2_TOOLCHAIN_HAS_SYNC_4 || \
+		!BR2_TOOLCHAIN_GCC_AT_LEAST_4_4

package/libmdbx/libmdbx.hash

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+# Hashes from: https://github.com/erthink/libmdbx/releases/
+sha256  a8f2436c4d008886e044f568a22bda44329fb1c67f175d91a929ff8e2065340a  libmdbx-amalgamated-0.10.3.tar.gz
+
+# Locally calculated
+sha256  310fe25c858a9515fc8c8d7d1f24a67c9496f84a91e0a0e41ea9975b1371e569  LICENSE

package/libmdbx/libmdbx.mk

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+################################################################################
+#
+# libmdbx
+#
+################################################################################
+
+LIBMDBX_VERSION = 0.10.3
+LIBMDBX_SOURCE = libmdbx-amalgamated-$(LIBMDBX_VERSION).tar.gz
+LIBMDBX_SITE = https://github.com/erthink/libmdbx/releases/download/v$(LIBMDBX_VERSION)
+LIBMDBX_SUPPORTS_IN_SOURCE_BUILD = NO
+LIBMDBX_LICENSE = OLDAP-2.8
+LIBMDBX_LICENSE_FILES = LICENSE
+LIBMDBX_REDISTRIBUTE = YES
+LIBMDBX_STRIP_COMPONENTS = 0
+LIBMDBX_INSTALL_STAGING = YES
+
+# Set CMAKE_BUILD_TYPE to Release to remove -Werror and avoid a build failure
+# with glibc < 2.12
+LIBMDBX_CONF_OPTS = \
+	-DCMAKE_BUILD_TYPE=Release \
+	-DMDBX_INSTALL_MANPAGES=OFF \
+	-DBUILD_FOR_NATIVE_CPU=OFF \
+	-DMDBX_BUILD_CXX=$(if $(BR2_PACKAGE_LIBMDBX_CXX),ON,OFF) \
+	-DMDBX_BUILD_TOOLS=$(if $(BR2_PACKAGE_LIBMDBX_TOOLS),ON,OFF)
+
+ifeq ($(BR2_STATIC_LIBS)$(BR2_SHARED_STATIC_LIBS),y)
+LIBMDBX_CONF_OPTS += -DMDBX_INSTALL_STATIC=ON
+else
+LIBMDBX_CONF_OPTS += -DMDBX_INSTALL_STATIC=OFF
+endif
+
+ifeq ($(BR2_SHARED_LIBS)$(BR2_SHARED_STATIC_LIBS),y)
+LIBMDBX_CONF_OPTS += \
+	-DMDBX_BUILD_SHARED_LIBRARY=ON \
+	-DMDBX_LINK_TOOLS_NONSTATIC=ON
+else
+LIBMDBX_CONF_OPTS += \
+	-DMDBX_BUILD_SHARED_LIBRARY=OFF \
+	-DMDBX_LINK_TOOLS_NONSTATIC=OFF
+endif
+
+$(eval $(cmake-package))