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Import include/xtensa-dynconfig.h that defines XCHAL_* macros as fields of a structure returned from the xtensa_get_config_v<x> function call. Define that structure and fill it with default parameter values specified in the include/xtensa-config.h. Define reusable function xtensa_load_config that tries to load configuration and return an address of an exported object from it. Define the function xtensa_get_config_v1 that uses xtensa_load_config to get structure xtensa_config_v1, either dynamically configured or the default. Provide essential XCHAL_* configuration parameters as __XCHAL_* built-in macros. This way it will be possible to use them in libgcc and libc without need to patch libgcc or libc source for the specific xtensa core configuration. gcc/ * config.gcc (xtensa*-*-*): Add xtensa-dynconfig.o to extra_objs. * config/xtensa/t-xtensa (TM_H): Add xtensa-dynconfig.h. (xtensa-dynconfig.o): New rule. * config/xtensa/xtensa-dynconfig.c: New file. * config/xtensa/xtensa-protos.h (xtensa_get_config_strings): New declaration. * config/xtensa/xtensa.h (xtensa-config.h): Replace #include with xtensa-dynconfig.h (XCHAL_HAVE_MUL32_HIGH, XCHAL_HAVE_RELEASE_SYNC) (XCHAL_HAVE_S32C1I, XCHAL_HAVE_THREADPTR) (XCHAL_HAVE_FP_POSTINC): Drop definitions. (TARGET_DIV32): Replace with __XCHAL_HAVE_DIV32. (TARGET_CPU_CPP_BUILTINS): Add new 'builtin' variable and loop through string array returned by the xtensa_get_config_strings function call. include/ * xtensa-dynconfig.h: New file.