By default SSE2 flags wrongly set on ARM CPU

[AeroXuk]

When following the compile instructions within the README.md of this repo on an ARM cpu (Raspberry Pi 4). SSE2 compile flags get set by default, even though the processor doesn't support them.

Rerunning configure with the --disable-sse2 flag or removing the lines below allows a successful build.

libpostal/configure.ac

Lines 75 to 87 in 21601eb

	# ------------------------------------------------------------------
	# Checks for SSE2 build
	# ------------------------------------------------------------------
	AC_ARG_ENABLE([sse2],
	AS_HELP_STRING(
	[--disable-sse2],
	[disable SSE2 optimization routines]
	)
	)
	AS_IF([test "x$enable_sse2" != "xno"], [
	CFLAGS="-mfpmath=sse -msse2 -DUSE_SSE ${CFLAGS}"
	])

The --disable-sse2 configure flag is not mentioned within the README.md compile instructions (allowing it to be missed).

Alternatively, it might also be better to detect the supported cpu features using an m4 plugin (e.g. AX_EXT or similar)?

[AeroXuk]

Is it possible to automate the check for SSE2 support or put that the option --disable-sse2 exists in the documentation on this repo.
Edited into the issue post

[thehappycoder]

Same happens on Apple m1 and Graviton EC2 instances https://aws.amazon.com/ec2/instance-types/t4/

[missinglink]

Issue has duplicates https://github.com/openvenues/libpostal/search?q=disable-sse2&type=issues