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dnl -*- Autoconf -*-
AC_DEFUN([RUBY_DEFAULT_ARCH], [
# Set ARCH_FLAG for different width but family CPU
AC_MSG_CHECKING([arch option])
AS_CASE([$1:"$host_cpu"],
[arm64:arm*], [ARCH_FLAG=-m64],
[x86_64:[i[3-6]86]], [ARCH_FLAG=-m64],
[x64:x86_64], [],
[[i[3-6]86]:x86_64], [ARCH_FLAG=-m32],
[ppc64:ppc*], [ARCH_FLAG=-m64],
[ppc*:ppc64], [ARCH_FLAG=-m32],
[*], [],
[
ARCH_FLAG=
for flag in "-arch "$1 -march=$1; do
_RUBY_TRY_CFLAGS([$]flag, [ARCH_FLAG="[$]flag"])
test x"$ARCH_FLAG" = x || break
done]
)
AC_MSG_RESULT([${ARCH_FLAG:-'(none)'}])
])dnl
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