initial buildroot for linux 5.15

package/p7zip/Config.in

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+config BR2_PACKAGE_P7ZIP
+	bool "p7zip"
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4 # __sync_*_4 intrisics
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_USE_WCHAR
+	help
+	  p7zip is a quick port of the command line version of 7-zip
+	  for Unix (see http://www.7-zip.org)
+
+	  7-Zip is a file archiver with highest compression ratio.
+
+	  http://sourceforge.net/projects/p7zip
+
+comment "p7zip needs a toolchain w/ threads, wchar, C++"
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_USE_WCHAR || !BR2_INSTALL_LIBSTDCPP

package/p7zip/p7zip.hash

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+# Locally calculated
+sha256  ea029a2e21d2d6ad0a156f6679bd66836204aa78148a4c5e498fe682e77127ef  p7zip-17.04.tar.gz
+sha256  555806657dcf0f1e720b581c52643c195ec86ae3f00bd18cc66d2e0f88ffa210  DOC/License.txt

package/p7zip/p7zip.mk

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+################################################################################
+#
+# p7zip
+#
+################################################################################
+
+P7ZIP_VERSION = 17.04
+P7ZIP_SITE = $(call github,jinfeihan57,p7zip,v$(P7ZIP_VERSION))
+P7ZIP_LICENSE = LGPL-2.1+ with unRAR restriction
+P7ZIP_LICENSE_FILES = DOC/License.txt
+P7ZIP_CPE_ID_VENDOR = 7-zip
+
+# p7zip buildsystem is a mess: it plays dirty tricks with CFLAGS and
+# CXXFLAGS, so we can't pass them. Instead, it accepts ALLFLAGS_C
+# and ALLFLAGS_CPP as variables to pass the CFLAGS and CXXFLAGS.
+define P7ZIP_BUILD_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) CC="$(TARGET_CC)" ALLFLAGS_C="$(TARGET_CFLAGS)" \
+		CXX="$(TARGET_CXX)" ALLFLAGS_CPP="$(TARGET_CXXFLAGS)" \
+		LDFLAGS="$(TARGET_LDFLAGS)" \
+		-C $(@D) 7zr
+endef
+
+define P7ZIP_INSTALL_TARGET_CMDS
+	$(INSTALL) -D -m 0755 $(@D)/bin/7zr $(TARGET_DIR)/usr/bin/7zr
+endef
+
+$(eval $(generic-package))