libcxxabi

USE flags

• abi_mips_n32 - 64-bit (32-bit pointer) libraries
• abi_mips_n64 - 64-bit libraries
• abi_mips_o32 - 32-bit libraries
• abi_ppc_32 - 32-bit (ppc) libraries
• abi_ppc_64 - 64-bit (ppc64) libraries
• abi_riscv_lp64 - 64-bit (rv64) soft-float libraries
• abi_riscv_lp64d - 64-bit (rv64) double hard-float libraries
• abi_s390_32 - 32-bit (s390) libraries
• abi_s390_64 - 64-bit (s390x) libraries
• abi_x86_32 - 32-bit (x86) libraries
• abi_x86_64 - 64-bit (amd64) libraries
• abi_x86_x32 - x32 ABI libraries
• elibc_musl - ELIBC setting for systems that use the musl C library
• libunwind - Use libunwind instead of libgcc_s for stack unwinding, thus avoiding dependency on gcc
• static-libs - Build static versions of dynamic libraries as well
• test - Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)