The build of scudo was failing on armv7l, with undefined references to unwinder symbols, such as __aeabi_unwind_cpp_pr0. These are needed by RTGwpAsan and thus, on ARM, scudo must also be linked against an unwind library. Besides that, fuzzer build was also failing, but with an invalid triple error. This happened because CMake's get_compiler_rt_target function was missing some code to correctly handle arm archs, such as armhf. Fixes https://github.com/llvm/llvm-project/issues/60115 The scudo build doesn't fail on other architectures, such as AArch64, because of differences in the unwind ABI of those. For instance, on AArch64, when `-funwind-tables` is used, it only adds an `.eh_frame` section, but no references to an unwind library. The fix of the invalid triple error was obtained from D140011.

The build of scudo was failing on armv7l, with undefined references to unwinder symbols, such as __aeabi_unwind_cpp_pr0. These are needed by RTGwpAsan and thus, on ARM, scudo must also be linked against an unwind library. The cmake command that caused the build failure was: ``` cmake --fresh -S "$PWD/llvm/" -B "$PWD/build/" -G Ninja \ -DCMAKE_INSTALL_PREFIX="$PWD/install" \ -DCMAKE_BUILD_TYPE=Release \ -DLLVM_ENABLE_PROJECTS="clang;lld;lldb;clang-tools-extra;polly" \ -DLLVM_ENABLE_RUNTIMES="compiler-rt;libcxx;libcxxabi;libunwind" \ -DLLVM_TOOLCHAIN_TOOLS="llvm-ar;llvm-ranlib;llvm-objdump;\ llvm-rc;llvm-cvtres;llvm-nm;llvm-strings;llvm-readobj;\ llvm-dlltool;llvm-pdbutil;llvm-objcopy;llvm-strip;llvm-cov;\ llvm-profdata;llvm-addr2line;llvm-symbolizer;llvm-windres;llvm-ml;\ llvm-readelf;llvm-size" \ -DLLVM_INSTALL_BINUTILS_SYMLINKS=OFF -DLLVM_PARALLEL_LINK_JOBS=1 ``` Fixes https://github.com/llvm/llvm-project/issues/60115 (together with D142906)

The build of scudo was failing on armv7l, with undefined references to unwinder symbols, such as __aeabi_unwind_cpp_pr0. These are needed by RTGwpAsan and thus, on ARM, scudo must also be linked against an unwind library. Besides that, fuzzer build was alsoThe cmake command that caused the build failing, but with an invalidure was: ``` triple error. This happened because CMake's get_compiler_rt_targetcmake --fresh -S "$PWD/llvm/" -B "$PWD/build/" -G Ninja \ function was missing some code to correctly handle arm archs, -DCMAKE_INSTALL_PREFIX="$PWD/install" \ such as armhf. Fixes https://github.com/llvm/llvm-project/issues/60115 The scudo build doesn't fail on other architectures, such as AArch64, because -DCMAKE_BUILD_TYPE=Release \ -DLLVM_ENABLE_PROJECTS="clang;lld;lldb;clang-tools-extra;polly" \ -DLLVM_ENABLE_RUNTIMES="compiler-rt;libcxx;libcxxabi;libunwind" \ -DLLVM_TOOLCHAIN_TOOLS="llvm-ar;llvm-ranlib;llvm-objdump;\ llvm-rc;llvm-cvtres;llvm-nm;llvm-strings;llvm-readobj;\ llvm-dlltool;llvm-pdbutil;llvm-objcopy;llvm-strip;llvm-cov;\ llvm-profdata;llvm-addr2line;llvm-symbolizer;llvm-windres;llvm-ml;\ of differences in the unwind ABI of those. For instance, on AArch64, whenllvm-readelf;llvm-size" \ `-funwind-tables` is used, it only adds an `.eh_frame` section, but no -DLLVM_INSTALL_BINUTILS_SYMLINKS=OFF -DLLVM_PARALLEL_LINK_JOBS=1 references to an unwind library.``` The fix of the invalid triple error was obtained fromFixes https://github.com/llvm/llvm-project/issues/60115 (together with D140011.2906)