newlib-cygwin/newlib/libc/machine/sh/acinclude.m4

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if test "${machine_dir}" = "sh"; then
AC_CACHE_CHECK([for SH5 (64-bit)], newlib_cv_sh64, [dnl
AC_PREPROC_IFELSE([AC_LANG_PROGRAM(
[[#if !defined(__SH5__)
# error "not SH5"
#endif
]])], [newlib_cv_sh64=yes], [newlib_cv_sh64=no])])
fi
AM_CONDITIONAL(SH64, [test "$newlib_cv_sh64" = yes])