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If we cannot get info from options and cpuinfo, we try to get from: 1. getauxval(AT_BASE_PLATFORM), introduced since Linux 5.7 2. _MIPS_ARCH from host compiler. mnan=2008 option is also used if __mips_nan2008__ is used. This can fix the wrong loader usage on r5/r6 platform with -march=native. gcc/ChangeLog: * config.gcc: set with_arch to default_mips_arch if no defined. * config/mips/driver-native.cc (host_detect_local_cpu): try getauxval(AT_BASE_PLATFORM) and _MIPS_ARCH, too. pass -mnan=2008 if __mips_nan2008__ is defined. * config.in: define HAVE_SYS_AUXV_H and HAVE_GETAUXVAL. * configure.ac: detect sys/auxv.h and getauxval. * configure: regenerated.
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