configure.ac

AC_INIT([poismf], 0.4.0)

AC_CHECK_LIB(atomic, __atomic_exchange, [HAS_ATOMIC=TRUE], [HAS_ATOMIC=FALSE])
if test "$HAS_ATOMIC" = "TRUE"; then
	OMP_PLUS_ATOMIC_L="\$(SHLIB_OPENMP_CFLAGS) -latomic"
	OMP_PLUS_ATOMIC="\$(SHLIB_OPENMP_CFLAGS)"
else
	OMP_PLUS_ATOMIC_L=""
	OMP_PLUS_ATOMIC=""
fi
AC_SUBST(OMP_PLUS_ATOMIC_L)
AC_SUBST(OMP_PLUS_ATOMIC)

CC=`"${R_HOME}/bin/R" CMD config CC`
CFLAGS=`"${R_HOME}/bin/R" CMD config CFLAGS`
CPPFLAGS=`"${R_HOME}/bin/R" CMD config CPPFLAGS`
OLD_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fno-math-errno"
AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM([[]])],
    [FNE_FLAG="-fno-math-errno"],
    [FNE_FLAG=""]
)
CFLAGS="$OLD_CFLAGS"
AC_SUBST(FNE_FLAG)

OLD_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fno-trapping-math"
AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM([[]])],
    [FNTP_FLAG="-fno-trapping-math"],
    [FNTP_FLAG=""]
)
CFLAGS="$OLD_CFLAGS"
AC_SUBST(FNTP_FLAG)

AC_CONFIG_FILES([src/Makevars])
AC_OUTPUT