[01/19] clang.inc: Global settings for clang toolchain

diff --git a/meta/conf/distro/include/clang.inc b/meta/conf/distro/include/clang.inc
new file mode 100644
index 00000000000..ce49bbc0ed1
--- /dev/null
+++ b/meta/conf/distro/include/clang.inc
@@ -0,0 +1,147 @@ 
+# Add the necessary override
+CCACHE_COMPILERCHECK:toolchain-clang ?= "%compiler% -v"
+HOST_CC_ARCH:prepend:toolchain-clang = "-target ${HOST_SYS} "
+CC:toolchain-clang  = "${CCACHE}${HOST_PREFIX}clang ${HOST_CC_ARCH}${TOOLCHAIN_OPTIONS}"
+CXX:toolchain-clang = "${CCACHE}${HOST_PREFIX}clang++ ${HOST_CC_ARCH}${TOOLCHAIN_OPTIONS}"
+CPP:toolchain-clang = "${CCACHE}${HOST_PREFIX}clang ${HOST_CC_ARCH}${TOOLCHAIN_OPTIONS} -E"
+CCLD:toolchain-clang = "${CCACHE}${HOST_PREFIX}clang ${HOST_CC_ARCH}${TOOLCHAIN_OPTIONS}"
+RANLIB:toolchain-clang = "${HOST_PREFIX}llvm-ranlib"
+AR:toolchain-clang = "${HOST_PREFIX}llvm-ar"
+NM:toolchain-clang = "${HOST_PREFIX}llvm-nm"
+OBJDUMP:toolchain-clang = "${HOST_PREFIX}llvm-objdump"
+OBJCOPY:toolchain-clang = "${HOST_PREFIX}llvm-objcopy"
+STRIP:toolchain-clang = "${HOST_PREFIX}llvm-strip"
+STRINGS:toolchain-clang = "${HOST_PREFIX}llvm-strings"
+READELF:toolchain-clang = "${HOST_PREFIX}llvm-readelf"
+LD:toolchain-clang = "${@bb.utils.contains('DISTRO_FEATURES', 'ld-is-lld', '${HOST_PREFIX}ld.lld${TOOLCHAIN_OPTIONS} ${HOST_LD_ARCH}', '${HOST_PREFIX}ld${TOOLCHAIN_OPTIONS} ${HOST_LD_ARCH}', d)}"
+
+LTO:toolchain-clang = "${@bb.utils.contains('DISTRO_FEATURES', 'thin-lto', '-flto=thin', '-flto -fuse-ld=lld', d)}"
+
+COMPILER_RT ??= ""
+COMPILER_RT:toolchain-clang:class-native = "-rtlib=libgcc ${UNWINDLIB}"
+COMPILER_RT:armeb = "-rtlib=libgcc ${UNWINDLIB}"
+COMPILER_RT:libc-klibc = "-rtlib=libgcc ${UNWINDLIB}"
+
+UNWINDLIB ??= ""
+UNWINDLIB:toolchain-clang:class-native = "--unwindlib=libgcc"
+UNWINDLIB:armeb = "--unwindlib=libgcc"
+UNWINDLIB_libc-klibc = "--unwindlib=libgcc"
+
+LIBCPLUSPLUS ??= ""
+LIBCPLUSPLUS:armv5 = "-stdlib=libstdc++"
+
+CXXFLAGS:append:toolchain-clang = " ${LIBCPLUSPLUS}"
+LDFLAGS:append:toolchain-clang = " ${COMPILER_RT} ${LIBCPLUSPLUS}"
+
+TUNE_CCARGS:remove:toolchain-clang = "-meb"
+TUNE_CCARGS:remove:toolchain-clang = "-mel"
+TUNE_CCARGS:append:toolchain-clang = "${@bb.utils.contains("TUNE_FEATURES", "bigendian", " -mbig-endian", " -mlittle-endian", d)}"
+
+# Clang does not yet support big.LITTLE performance tunes, so use the LITTLE for tunes
+TUNE_CCARGS:remove:toolchain-clang = "\
+    -mcpu=cortex-a57.cortex-a53${TUNE_CCARGS_MARCH_OPTS} \
+    -mcpu=cortex-a72.cortex-a53${TUNE_CCARGS_MARCH_OPTS} \
+    -mcpu=cortex-a15.cortex-a7${TUNE_CCARGS_MARCH_OPTS} \
+    -mcpu=cortex-a17.cortex-a7${TUNE_CCARGS_MARCH_OPTS} \
+    -mcpu=cortex-a72.cortex-a35${TUNE_CCARGS_MARCH_OPTS} \
+    -mcpu=cortex-a73.cortex-a53${TUNE_CCARGS_MARCH_OPTS} \
+    -mcpu=cortex-a75.cortex-a55${TUNE_CCARGS_MARCH_OPTS} \
+    -mcpu=cortex-a76.cortex-a55${TUNE_CCARGS_MARCH_OPTS}"
+TUNE_CCARGS:append:toolchain-clang = "${@bb.utils.contains_any("TUNE_FEATURES", "cortexa72-cortexa53 cortexa57-cortexa53 cortexa73-cortexa53", " -mcpu=cortex-a53${TUNE_CCARGS_MARCH_OPTS}", "", d)}"
+TUNE_CCARGS:append:toolchain-clang = "${@bb.utils.contains_any("TUNE_FEATURES", "cortexa15-cortexa7 cortexa17-cortexa7", " -mcpu=cortex-a7${TUNE_CCARGS_MARCH_OPTS}", "", d)}"
+TUNE_CCARGS:append:toolchain-clang = "${@bb.utils.contains_any("TUNE_FEATURES", "cortexa72-cortexa35", " -mcpu=cortex-a35${TUNE_CCARGS_MARCH_OPTS}", "", d)}"
+TUNE_CCARGS:append:toolchain-clang = "${@bb.utils.contains_any("TUNE_FEATURES", "cortexa75-cortexa55 cortexa76-cortexa55", " -mcpu=cortex-a55${TUNE_CCARGS_MARCH_OPTS}", "", d)}"
+
+# Workaround for https://github.com/llvm/llvm-project/issues/85699
+# needed for 64bit rpi3/rpi4 machines
+TUNE_CCARGS_MARCH_OPTS:append:toolchain-clang = "${@bb.utils.contains_any("DEFAULTTUNE", "cortexa72 cortexa53", "+nocrypto", "", d)}"
+
+# Clang does not support octeontx2 processor
+TUNE_CCARGS:remove:toolchain-clang = "-mcpu=octeontx2${TUNE_CCARGS_MARCH_OPTS}"
+
+# Reconcile some ppc anamolies
+TUNE_CCARGS:remove:toolchain-clang:powerpc = "-mhard-float -mno-spe"
+TUNE_CCARGS:append:toolchain-clang:libc-musl:powerpc64 = " -mlong-double-64"
+TUNE_CCARGS:append:toolchain-clang:libc-musl:powerpc64le = " -mlong-double-64"
+TUNE_CCARGS:append:toolchain-clang:libc-musl:powerpc = " -mlong-double-64"
+# usrmerge workaround
+TUNE_CCARGS:append:toolchain-clang = "${@bb.utils.contains("DISTRO_FEATURES", "usrmerge", " --dyld-prefix=/usr", "", d)}"
+
+TUNE_CCARGS:append:toolchain-clang = " -Qunused-arguments"
+
+LDFLAGS:append:toolchain-clang:class-nativesdk:x86-64 = " -Wl,-dynamic-linker,${base_libdir}/ld-linux-x86-64.so.2"
+LDFLAGS:append:toolchain-clang:class-nativesdk:x86 = " -Wl,-dynamic-linker,${base_libdir}/ld-linux.so.2"
+LDFLAGS:append:toolchain-clang:class-nativesdk:aarch64 = " -Wl,-dynamic-linker,${base_libdir}/ld-linux-aarch64.so.1"
+
+LDFLAGS:toolchain-clang:class-nativesdk = "${BUILDSDK_LDFLAGS} \
+                                           -Wl,-rpath-link,${STAGING_LIBDIR}/.. \
+                                           -Wl,-rpath,${libdir}/.. "
+
+# Enable lld globally"
+LDFLAGS:append:toolchain-clang = "${@bb.utils.contains('DISTRO_FEATURES', 'ld-is-lld', ' -fuse-ld=lld', '', d)}"
+
+# Remove gcc specific -fcanon-prefix-map option, added in gcc-13+
+# clang does not support it yet
+DEBUG_PREFIX_MAP:remove:toolchain-clang = "-fcanon-prefix-map"
+
+# choose between 'gcc' 'clang' an empty '' can be used as well
+TOOLCHAIN ??= "gcc"
+# choose between 'gnu' 'llvm'
+TC_CXX_RUNTIME ??= "gnu"
+# Using gcc or llvm runtime is only available when using clang for compiler
+#TC_CXX_RUNTIME:toolchain-gcc = "gnu"
+TC_CXX_RUNTIME:armeb = "gnu"
+TC_CXX_RUNTIME:armv5 = "gnu"
+
+TOOLCHAIN:class-native = "gcc"
+TOOLCHAIN:class-nativesdk = "gcc"
+TOOLCHAIN:class-cross-canadian = "gcc"
+TOOLCHAIN:class-crosssdk = "gcc"
+TOOLCHAIN:class-cross = "gcc"
+
+OVERRIDES =. "${@['', 'toolchain-${TOOLCHAIN}:']['${TOOLCHAIN}' != '']}"
+OVERRIDES =. "${@['', 'runtime-${TC_CXX_RUNTIME}:']['${TC_CXX_RUNTIME}' != '']}"
+OVERRIDES[vardepsexclude] += "TOOLCHAIN TC_CXX_RUNTIME"
+
+YOCTO_ALTERNATE_EXE_PATH:toolchain-clang:class-target = "${STAGING_BINDIR}/llvm-config"
+YOCTO_ALTERNATE_LIBDIR:toolchain-clang:class-target = "/${BASELIB}"
+
+#YOCTO_ALTERNATE_EXE_PATH:toolchain-clang:class-target[export] = "1"
+#YOCTO_ALTERNATE_LIBDIR:toolchain-clang:class-target[export] = "1"
+
+#DEPENDS:append:toolchain-clang:class-target = " clang-cross-${TARGET_ARCH} "
+#DEPENDS:remove:toolchain-clang:allarch = "clang-cross-${TARGET_ARCH}"
+
+def clang_base_deps(d):
+    ret = ""
+    if not d.getVar('INHIBIT_DEFAULT_DEPS', False):
+        if not oe.utils.inherits(d, 'allarch') :
+            ret += " ${MLPREFIX}clang-cross-${TARGET_ARCH} virtual/libc"
+            if (d.getVar('TC_CXX_RUNTIME').find('android') != -1):
+                ret += " ${MLPREFIX}libcxx"
+            else:
+                ret += " virtual/${TARGET_PREFIX}compilerlibs ${MLPREFIX}compiler-rt ${MLPREFIX}libcxx"
+    return ret
+
+BASE_DEFAULT_DEPS:append:class-target:toolchain-clang:class-target = " ${@clang_base_deps(d)}"
+BASE_DEFAULT_DEPS:append:class-native:toolchain-clang:runtime-llvm = " libcxx-native compiler-rt-native"
+BASE_DEFAULT_DEPS:append:class-nativesdk:toolchain-clang:runtime-llvm = " clang-native nativesdk-libcxx nativesdk-compiler-rt"
+
+# do_populate_sysroot needs STRIP
+POPULATESYSROOTDEPS:toolchain-clang:class-target = "${MLPREFIX}clang-cross-${TARGET_ARCH}:do_populate_sysroot"
+
+cmake_do_generate_toolchain_file:append:toolchain-clang () {
+    cat >> ${WORKDIR}/toolchain.cmake <<EOF
+set( CMAKE_CLANG_TIDY ${HOST_PREFIX}clang-tidy )
+EOF
+    sed -i 's/ -mmusl / /g' ${WORKDIR}/toolchain.cmake
+}
+
+# dump recipes which still use gcc
+#python __anonymous() {
+#    toolchain = d.getVar("TOOLCHAIN")
+#    if not toolchain or toolchain == "clang" or 'class-target' not in d.getVar('OVERRIDES').split(':'):
+#        return
+#    pkgn = d.getVar("PN")
+#    bb.warn("%s - %s" % (pkgn, toolchain))
+#}