* ref: [[https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=139091&p=922980|discussion]]
  * bug report: [[https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70132|bug]]


quick fix:
<code>
brew edit hello
# add
"CFLAGS=-mcpu=cortex-a53 -mfpu=neon-vfpv4",
"CXXFLAGS=-mcpu=cortex-a53 -mfpu=neon-vfpv4",
# to end of ./configure
</code>