Merge from bittboy/buildroot@26c91a9

package/uvw/Config.in

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+config BR2_PACKAGE_UVW
+	bool "uvw"
+	depends on BR2_TOOLCHAIN_HAS_THREADS_NPTL # libuv
+	depends on BR2_USE_MMU # libuv
+	depends on !BR2_STATIC_LIBS # libuv
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4 # libuv
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_7 # C++17
+	select BR2_PACKAGE_LIBUV
+	help
+	  Header-only, event based, tiny and easy to use
+	  libuv wrapper in modern C++.
+
+	  https://github.com/skypjack/uvw
+
+comment "uvw needs a toolchain w/ NPTL, dynamic library, C++, gcc >= 7"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS_NPTL || BR2_STATIC_LIBS || \
+		!BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_7
+	depends on BR2_USE_MMU
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4

package/uvw/uvw.hash

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+# Locally calculated
+sha256  2695276bb4b154174ac0a6401bde5c0768bca99a43c9a469af67526f7e2e9410  uvw-2.6.0_libuv-v1.38.tar.gz
+sha256  755b2f245af22830c15b60c54469c0d92fbed42009b0d0074cec4b3959905757  LICENSE

package/uvw/uvw.mk

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+################################################################################
+#
+# uvw
+#
+################################################################################
+
+UVW_VERSION = 2.6.0_libuv-v1.38
+UVW_SITE = $(call github,skypjack,uvw,v$(UVW_VERSION))
+UVW_INSTALL_STAGING = YES
+UVW_INSTALL_TARGET = NO
+UVW_SUPPORTS_IN_SOURCE_BUILD = NO
+UVW_DEPENDENCIES = libuv
+UVW_LICENSE = MIT
+UVW_LICENSE_FILES = LICENSE
+
+# The following CMake variable disables a TRY_RUN call in the -pthread
+# test which is not allowed when cross-compiling (for cmake < 3.10)
+UVW_CONF_OPTS = -DTHREADS_PTHREAD_ARG=OFF
+
+$(eval $(cmake-package))