On 19 May 2016 at 10:33, Jeffrey Walton wrote: > 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. You could create a wrapper script called gcc which invokes the real gcc with those options and put it earlier in your $PATH. > 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? There is no file, the default specs are built in to the compiler. Use -dumpspecs to dump them to a file that you can modify and feed back to the compiler.
