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129623416c
The build uses -nostdlib which prevents GCC from auto-linking libgcc_eh.a. This library provides the SEH unwind symbols (_Unwind_Resume, __emutls_get_address, etc.) needed by C++ exception handling. Without it, any C++ target compiled with -fexceptions fails to link with undefined references to these symbols. Add a libgcc_eh INTERFACE target that conditionally pulls in libgcc_eh.a when the toolchain provides it (as on SEH-enabled x86_64), falling back to a no-op otherwise (SJLJ/DWARF toolchains).