[Mod] First commit

package/libunwind/Config.in

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+# libunwind is only available for a certain subset of the
+# architectures (as visible in the list of architectures supported
+# with the glibc C library below).
+#
+# In addition to this, on some architectures libunwind requires the
+# *context() function from the C library, which are only available on
+# certain architectures in uClibc, and not available at all on
+# musl. But on some other architectures, libunwind works without using
+# the *context() functions, which allows it to be built with musl.
+config BR2_PACKAGE_LIBUNWIND_ARCH_SUPPORTS
+	bool
+	default y if BR2_TOOLCHAIN_USES_GLIBC && \
+		(BR2_ARM_CPU_HAS_ARM || BR2_aarch64 || BR2_mips || BR2_mipsel || \
+		 BR2_mips64 || BR2_mips64el || BR2_powerpc || BR2_sh || \
+		 BR2_i386 || BR2_x86_64)
+	default y if BR2_TOOLCHAIN_USES_UCLIBC && \
+		(BR2_ARM_CPU_HAS_ARM || BR2_mips || BR2_mipsel || \
+		 BR2_mips64 || BR2_mips64el || BR2_x86_64)
+	default y if BR2_TOOLCHAIN_USES_MUSL && \
+		(BR2_ARM_CPU_HAS_ARM || BR2_aarch64 || BR2_x86_64)
+
+config BR2_PACKAGE_LIBUNWIND
+	bool "libunwind"
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_PACKAGE_LIBUNWIND_ARCH_SUPPORTS
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 # C11 atomics
+	# forcefully links against libgcc_s, only available in dynamic
+	# linking configurations
+	depends on !BR2_STATIC_LIBS
+	help
+	  C API to determine the call-chain of a program.
+
+	  http://www.nongnu.org/libunwind/index.html
+
+comment "libunwind needs a toolchain w/ threads, dynamic library, gcc >= 4.9"
+	depends on BR2_PACKAGE_LIBUNWIND_ARCH_SUPPORTS
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS || \
+		!BR2_TOOLCHAIN_GCC_AT_LEAST_4_9

package/libunwind/libunwind.hash

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+# Locally calculated after checking pgp signature
+sha256  4a6aec666991fb45d0889c44aede8ad6eb108071c3554fcdff671f9c94794976  libunwind-1.6.2.tar.gz
+
+# Hash for license file
+sha256  6a0dbbdaec2b3136b7bf045586f4212bdf74e7af688bf9dfe9154607cf5ec156  COPYING

package/libunwind/libunwind.mk

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+################################################################################
+#
+# libunwind
+#
+################################################################################
+
+LIBUNWIND_VERSION = 1.6.2
+LIBUNWIND_SITE = http://download.savannah.gnu.org/releases/libunwind
+LIBUNWIND_INSTALL_STAGING = YES
+LIBUNWIND_LICENSE_FILES = COPYING
+LIBUNWIND_LICENSE = MIT
+LIBUNWIND_CPE_ID_VENDOR = libunwind_project
+LIBUNWIND_AUTORECONF = YES
+
+LIBUNWIND_CONF_OPTS = \
+	--disable-tests \
+	$(if $(BR2_INSTALL_LIBSTDCPP),--enable-cxx-exceptions,--disable-cxx-exceptions)
+
+$(eval $(autotools-package))