initial buildroot for linux 5.15

package/clang/Config.in

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+config BR2_PACKAGE_CLANG
+	bool "clang"
+	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735 # std::shared_future
+	depends on !BR2_STATIC_LIBS
+	depends on BR2_USE_WCHAR # std::wstring
+	select BR2_PACKAGE_LLVM
+	help
+	  Clang is a C/C++, Objective C/C++ and OpenCL C front-end
+	  for the LLVM compiler.
+
+	  http://clang.llvm.org
+
+comment "clang needs a toolchain w/ wchar, threads, C++, gcc >= 4.8, dynamic library"
+	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_INSTALL_LIBSTDCPP || \
+		!BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 \
+		|| BR2_STATIC_LIBS || !BR2_USE_WCHAR
+
+comment "clang needs a toolchain not affected by GCC bug 64735"
+	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
+	depends on BR2_TOOLCHAIN_HAS_GCC_BUG_64735

package/clang/clang.hash

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+# locally calculated
+sha256 5778512b2e065c204010f88777d44b95250671103e434f9dc7363ab2e3804253 clang-9.0.1.src.tar.xz
+sha256 ebcd9bbf783a73d05c53ba4d586b8d5813dcdf3bbec50265860ccc885e606f47 LICENSE.TXT

package/clang/clang.mk

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+################################################################################
+#
+# clang
+#
+################################################################################
+
+# LLVM, Clang and lld should be version bumped together
+CLANG_VERSION = 9.0.1
+CLANG_SITE = https://github.com/llvm/llvm-project/releases/download/llvmorg-$(CLANG_VERSION)
+CLANG_SOURCE = clang-$(CLANG_VERSION).src.tar.xz
+CLANG_LICENSE = Apache-2.0 with exceptions
+CLANG_LICENSE_FILES = LICENSE.TXT
+CLANG_CPE_ID_VENDOR = llvm
+CLANG_SUPPORTS_IN_SOURCE_BUILD = NO
+CLANG_INSTALL_STAGING = YES
+
+HOST_CLANG_DEPENDENCIES = host-llvm host-libxml2
+CLANG_DEPENDENCIES = llvm host-clang
+
+# LLVM >= 9.0 will soon require C++14 support, building llvm 8.x using a
+# toolchain using gcc < 5.1 gives an error but actually still works. Setting
+# this option makes it still build with gcc >= 4.8.
+# https://reviews.llvm.org/D57264
+HOST_CLANG_CONF_OPTS += -DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=ON
+CLANG_CONF_OPTS += -DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=ON
+
+# This option is needed, otherwise multiple shared libs
+# (libclangAST.so, libclangBasic.so, libclangFrontend.so, etc.) will
+# be generated. As a final shared lib containing all these components
+# (libclang.so) is also generated, this resulted in the following
+# error when trying to use tools that use libclang:
+# $ CommandLine Error: Option 'track-memory' registered more than once!
+# $ LLVM ERROR: inconsistency in registered CommandLine options
+# By setting BUILD_SHARED_LIBS to OFF, we generate multiple static
+# libraries (the same way as host's clang build) and finally
+# libclang.so to be installed on the target.
+HOST_CLANG_CONF_OPTS += -DBUILD_SHARED_LIBS=OFF
+CLANG_CONF_OPTS += -DBUILD_SHARED_LIBS=OFF
+
+# Default is Debug build, which requires considerably more disk space
+# and build time. Release build is selected for host and target
+# because the linker can run out of memory in Debug mode.
+HOST_CLANG_CONF_OPTS += -DCMAKE_BUILD_TYPE=Release
+CLANG_CONF_OPTS += -DCMAKE_BUILD_TYPE=Release
+
+CLANG_CONF_OPTS += -DCMAKE_CROSSCOMPILING=1
+
+# We need to build tools because libclang is a tool
+HOST_CLANG_CONF_OPTS += -DCLANG_BUILD_TOOLS=ON
+CLANG_CONF_OPTS += -DCLANG_BUILD_TOOLS=ON
+
+HOST_CLANG_CONF_OPTS += \
+	-DCLANG_BUILD_EXAMPLES=OFF \
+	-DCLANG_INCLUDE_DOCS=OFF \
+	-DCLANG_INCLUDE_TESTS=OFF
+
+CLANG_CONF_OPTS += \
+	-DCLANG_BUILD_EXAMPLES=OFF \
+	-DCLANG_INCLUDE_DOCS=OFF \
+	-DCLANG_INCLUDE_TESTS=OFF
+
+HOST_CLANG_CONF_OPTS += -DLLVM_DIR=$(HOST_DIR)/lib/cmake/llvm \
+	-DCLANG_DEFAULT_LINKER=$(TARGET_LD)
+CLANG_CONF_OPTS += -DLLVM_DIR=$(STAGING_DIR)/usr/lib/cmake/llvm \
+	-DCLANG_TABLEGEN:FILEPATH=$(HOST_DIR)/bin/clang-tblgen \
+	-DLLVM_TABLEGEN_EXE:FILEPATH=$(HOST_DIR)/bin/llvm-tblgen
+
+# Clang can't be used as compiler on the target since there are no
+# development files (headers) and other build tools. So remove clang
+# binaries and some other unnecessary files from target.
+CLANG_FILES_TO_REMOVE = \
+	/usr/bin/clang* \
+	/usr/bin/c-index-test \
+	/usr/bin/git-clang-format \
+	/usr/bin/scan-build \
+	/usr/bin/scan-view \
+	/usr/libexec/c++-analyzer \
+	/usr/libexec/ccc-analyzer \
+	/usr/share/clang \
+	/usr/share/opt-viewer \
+	/usr/share/scan-build \
+	/usr/share/scan-view \
+	/usr/share/man/man1/scan-build.1 \
+	/usr/lib/clang
+
+define CLANG_CLEANUP_TARGET
+	rm -rf $(addprefix $(TARGET_DIR),$(CLANG_FILES_TO_REMOVE))
+endef
+CLANG_POST_INSTALL_TARGET_HOOKS += CLANG_CLEANUP_TARGET
+
+# clang-tblgen is not installed by default, however it is necessary
+# for cross-compiling clang
+define HOST_CLANG_INSTALL_CLANG_TBLGEN
+	$(INSTALL) -D -m 0755 $(HOST_CLANG_BUILDDIR)/bin/clang-tblgen \
+		$(HOST_DIR)/bin/clang-tblgen
+endef
+HOST_CLANG_POST_INSTALL_HOOKS = HOST_CLANG_INSTALL_CLANG_TBLGEN
+
+# This option must be enabled to link libclang dynamically against libLLVM.so
+HOST_CLANG_CONF_OPTS += -DLLVM_LINK_LLVM_DYLIB=ON
+CLANG_CONF_OPTS += -DLLVM_LINK_LLVM_DYLIB=ON
+
+# Prevent clang binaries from linking against LLVM static libs
+HOST_CLANG_CONF_OPTS += -DLLVM_DYLIB_COMPONENTS=all
+CLANG_CONF_OPTS += -DLLVM_DYLIB_COMPONENTS=all
+
+$(eval $(cmake-package))
+$(eval $(host-cmake-package))