I'm working on my BananaPi. It is a Cortex-A7 with ARMv7-a. Compile results in the following. According to Stallman I believe you are supposed to add the necessary options to compile the file independent of CFLAGS, and it should not need to be override-able by the user because it is required. Also see https://www.gnu.org/prep/standards/html_node/Command-Variables.html .
gcc -std=gnu99 -c -DHAVE_CONFIG_H -I. -I.. -D__GMP_WITHIN_GMP -I.. -DOPERATION_lshift -I/usr/local/include -DNDEBUG -g2 -O2 -march=native -fPIC -Wa,--noexecstack tmp-lshift.s -fPIC -DPIC -o .libs/lshift.o tmp-lshift.s: gcc -std=gnu99 -c -DHAVE_CONFIG_H -I. -I.. -D__GMP_WITHIN_GMP -I.. -DOPERATION_rshift -I/usr/local/include -DNDEBUG -g2 -O2 -march=native -fPIC -Wa,--noexecstack tmp-rshift.s -fPIC -DPIC -o .libs/rshift.o Assembler messages: tmp-lshift.s:106: Error: selected processor does not support ARM mode `vdup.32 d6,r3' tmp-lshift.s:108: Error: selected processor does not support ARM mode `vdup.32 d7,r3' tmp-lshift.s:114: Error: selected processor does not support ARM mode `vshl.u64 d18,d19,d7' tmp-lshift.s:120: Error: selected processor does not support ARM mode `vshl.u64 d4,d19,d6' ...
<<attachment: config.log.zip>>
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