I have a LeMaker HiKey dev board (http://www.lemaker.org/product-hikey-index.html). Its ARMv8/Aarch64 with an 8-core A-53 processor. The problem I have is each time I SSH into the device I usually need to do the following to get the Crypto extensions that are available natively (GCC fails to consume `-march=native`): export CXXFLAGS="-DNDEBUG -g3 -O3 -march=armv8-a+crypto -mcpu=cortex-a53" I have to do similar when testing CRC32 extensions, and often need to `-march=armv8-a+crc` or `-march=armv8-a+crc+crypto`. I'd like to add `-march=armv8-a+crc+crypto -mcpu=cortex-a53` to a GCC spec file so its always available for various programs, without the need for source'ing .bash_profile. However, I don't see a GCC spec file that seems to cover it: $ find /usr/lib -name '*.spec*' /usr/lib/gcc/aarch64-linux-gnu/4.9/libgomp.spec /usr/lib/gcc/aarch64-linux-gnu/4.9/libitm.spec I also know GCC is using something, but it does not tell me what it is: $ gcc -v Using built-in specs. ... My questions are: * What is the name of the built-in GCC spec file? * What is the formula to add the options if they are not specified on the command line? I visited http://gcc.gnu.org/onlinedocs/gcc/Spec-Files.html, but I don't see an answer to the first question. The answer to the second question is probably in the man page, but I have to admit I'm not really versed with the Spec file grammar. Jeff
