initial buildroot for linux 5.15

package/libunwind/0001-Add-AO_REQUIRE_CAS-to-fix-build-on-ARM-v6.patch

@@ -0,0 +1,56 @@
+From 24484e80b3e329c9edee1995e102f8612eedb79c Mon Sep 17 00:00:00 2001
+From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+Date: Tue, 13 May 2014 23:32:27 +0200
+Subject: [PATCH] Add AO_REQUIRE_CAS to fix build on ARM < v6
+
+ARM earlier than ARMv6, such as ARMv4 and ARMv5 do not provide
+optimize atomic operations in libatomic_ops. Since libunwind is using
+such operations, it should define AO_REQUIRE_CAS before including
+<atomic_ops.h> so that libatomic_ops knows it should use emulated
+atomic operations instead (even though they are obviously a lot more
+expensive).
+
+Also, while real atomic operations are all inline functions and
+therefore linking against libatomic_ops was not required, the emulated
+atomic operations actually require linking against libatomic_ops, so
+the commented AC_CHECK_LIB test in acinclude.m4 is uncommented to make
+sure we link against libatomic_ops.
+
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+---
+ acinclude.m4          | 8 +-------
+ include/libunwind_i.h | 1 +
+ 2 files changed, 2 insertions(+), 7 deletions(-)
+
+diff --git a/acinclude.m4 b/acinclude.m4
+index 497f7c2..9c15af1 100644
+--- a/acinclude.m4
++++ b/acinclude.m4
+@@ -22,11 +22,5 @@ fi])
+ AC_DEFUN([CHECK_ATOMIC_OPS],
+ [dnl Check whether the system has the atomic_ops package installed.
+   AC_CHECK_HEADERS(atomic_ops.h)
+-#
+-# Don't link against libatomic_ops for now.  We don't want libunwind
+-# to depend on libatomic_ops.so.  Fortunately, none of the platforms
+-# we care about so far need libatomic_ops.a (everything is done via
+-# inline macros).
+-#
+-#  AC_CHECK_LIB(atomic_ops, main)
++  AC_CHECK_LIB(atomic_ops, main)
+ ])
+diff --git a/include/libunwind_i.h b/include/libunwind_i.h
+index 23f615e..deabdfd 100644
+--- a/include/libunwind_i.h
++++ b/include/libunwind_i.h
+@@ -95,6 +95,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+ 	(pthread_mutex_unlock != NULL ? pthread_mutex_unlock (l) : 0)
+ 
+ #ifdef HAVE_ATOMIC_OPS_H
++# define AO_REQUIRE_CAS
+ # include <atomic_ops.h>
+ static inline int
+ cmpxchg_ptr (void *addr, void *old, void *new)
+-- 
+1.9.2
+

package/libunwind/Config.in

@@ -0,0 +1,36 @@
+# 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
+	# 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"
+	depends on BR2_PACKAGE_LIBUNWIND_ARCH_SUPPORTS
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS

package/libunwind/libunwind.hash

@@ -0,0 +1,5 @@
+# Locally calculated after checking pgp signature
+sha256  90337653d92d4a13de590781371c604f9031cdb50520366aa1e3a91e1efb1017  libunwind-1.5.0.tar.gz
+
+# Hash for license file
+sha256  6a0dbbdaec2b3136b7bf045586f4212bdf74e7af688bf9dfe9154607cf5ec156  COPYING

package/libunwind/libunwind.mk

@@ -0,0 +1,23 @@
+################################################################################
+#
+# libunwind
+#
+################################################################################
+
+LIBUNWIND_VERSION = 1.5.0
+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 $(BR2_INSTALL_LIBSTDCPP),--enable-cxx-exceptions,--disable-cxx-exceptions)
+
+ifeq ($(BR2_PACKAGE_LIBATOMIC_OPS),y)
+LIBUNWIND_DEPENDENCIES += libatomic_ops
+endif
+
+$(eval $(autotools-package))