Enable libunwind and disable compiler-rt

mk/prefix.mk

@@ -332,8 +332,6 @@ else
 	@#TODO: generates wrong lib path for libtool
 	rm -f "$@.partial"/$(GNU_TARGET)/lib/libstdc++.la
 	rm -f "$@.partial"/$(GNU_TARGET)/lib/libsupc++.la
-	@#TODO: Needed by clang, yet not emitted
-	ln -s crtbegin.o "$@.partial"/lib/gcc/$(GNU_TARGET)/13.2.0/crtbeginT.o
 # hosted libstdcxx
 	export PATH="$(ROOT)/$@.partial/bin:$$PATH" \
 		ACLOCAL_PATH="$(LIBTOOL_PATH)/share/aclocal:$$ACLOCAL_PATH" && \

recipes/dev/llvm-rt21/recipe.toml

@@ -10,8 +10,11 @@ DYNAMIC_INIT
 generate_cookbook_cmake_file "$COOKBOOK_HOST_TARGET" "" "$COOKBOOK_TOOLCHAIN" native.cmake
 
 COOKBOOK_CMAKE_FLAGS+=(
-    -DLLVM_ENABLE_RUNTIMES="compiler-rt;libcxx;libcxxabi"
+    -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libunwind"
     -DCMAKE_TRY_COMPILE_TARGET_TYPE=STATIC_LIBRARY
+    
+    # unused compiler-rt flags, disabled for now to prevent runtime mixups
+    -DCOMPILER_RT_BUILD_CRT=ON
     -DCOMPILER_RT_BUILD_ORC=OFF
     -DCOMPILER_RT_BUILD_XRAY=OFF
     -DCOMPILER_RT_BUILD_MEMPROF=OFF
@@ -19,14 +22,17 @@ COOKBOOK_CMAKE_FLAGS+=(
     -DCOMPILER_RT_BUILD_SANITIZERS=OFF
     -DCOMPILER_RT_USE_BUILTINS_LIBRARY=ON
     -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=ON
-    -DLIBCXX_USE_COMPILER_RT=ON
-    -DLIBCXX_ENABLE_SHARED=OFF
+
+    -DLIBCXX_USE_COMPILER_RT=OFF
+    -DLIBCXX_ENABLE_SHARED=ON
     -DLIBCXX_ENABLE_LOCALIZATION=OFF # TODO: *_l functions
     -DLIBCXX_ENABLE_FILESYSTEM=OFF # TODO: fstream require locales
     -DLIBCXX_ENABLE_WIDE_CHARACTERS=OFF # TODO: wsctof, wsctold
-    -DLIBCXXABI_USE_COMPILER_RT=ON
-    -DLIBCXXABI_ENABLE_SHARED=OFF
-    -DLIBCXXABI_USE_LLVM_UNWINDER=OFF # TODO: libunwind need link.h
+    -DLIBCXXABI_USE_COMPILER_RT=OFF
+    -DLIBCXXABI_ENABLE_SHARED=ON
+    -DLIBCXXABI_USE_LLVM_UNWINDER=OFF # libgcc contains unwinder
+    -DLIBUNWIND_USE_COMPILER_RT=OFF
+    -DLIBUNWIND_ENABLE_SHARED=ON
     -DCOMPILER_RT_INSTALL_PATH="/usr/lib/clang/21"
 
 # the shared options from llvm