LIGHTNING_CFLAGS=

AC_CHECK_FUNCS(mremap ffsl isnan isinf,,)

case "$host_os" in
    *bsd*|osf*)		SHLIB=""	;;
    *hpux*)		SHLIB="-ldld"	;;
    *)			SHLIB="-ldl"	;;
esac
AC_SUBST(SHLIB)

cpu=
case "$target_cpu" in
    i?86|x86_64|amd64)	cpu=x86		;;
    *arm*)		cpu=arm		;;
    *mips*)		cpu=mips	;;
    *powerpc*)		cpu=ppc		;;
    *sparc*)		cpu=sparc	;;
    ia64)		cpu=ia64	;;
    hppa*)		cpu=hppa	;;
    aarch64)		cpu=aarch64	;;
    s390*)		cpu=s390	;;
    alpha*)		cpu=alpha	;;
    *)					;;
esac
AM_CONDITIONAL(cpu_arm,     [test cpu-$cpu = cpu-arm])
AM_CONDITIONAL(cpu_mips,    [test cpu-$cpu = cpu-mips])
AM_CONDITIONAL(cpu_ppc,     [test cpu-$cpu = cpu-ppc])
AM_CONDITIONAL(cpu_sparc,   [test cpu-$cpu = cpu-sparc])
AM_CONDITIONAL(cpu_x86,     [test cpu-$cpu = cpu-x86])
AM_CONDITIONAL(cpu_ia64,    [test cpu-$cpu = cpu-ia64])
AM_CONDITIONAL(cpu_hppa,    [test cpu-$cpu = cpu-hppa])
AM_CONDITIONAL(cpu_aarch64, [test cpu-$cpu = cpu-aarch64])
AM_CONDITIONAL(cpu_s390,    [test cpu-$cpu = cpu-s390])
AM_CONDITIONAL(cpu_alpha,   [test cpu-$cpu = cpu-alpha])

# Test x87 if both, x87 and sse2 available
ac_cv_test_x86_x87=
# Test arm instruction set if thumb instruction set available
ac_cv_test_arm_arm=
# Test sofware float if vfp available and not using hard float abi
ac_cv_test_arm_swf=

save_CFLAGS=$CFLAGS
CFLAGS="$CFLAGS -I$PWD/include -D_GNU_SOURCE"
if test x$cpu = x; then
    AC_MSG_ERROR([cpu $target_cpu not supported])
elif test $cpu = x86; then
    AC_RUN_IFELSE([AC_LANG_SOURCE([[
    #include <lightning.h>
    int main(void) {
	int		    ac, flags;
	unsigned int	    eax, ebx, ecx, edx;
	if (__WORDSIZE == 64)
	    return 1;
	__asm__ volatile ("pushfl;\n\t"
			  "popl %0;\n\t"
			  "movl \$0x240000, %1;\n\t"
			  "xorl %0, %1;\n\t"
			  "pushl %1;\n\t"
			  "popfl;\n\t"
			  "pushfl;\n\t"
			  "popl %1;\n\t"
			  "xorl %0, %1;\n\t"
			  "pushl %0;\n\t"
			  "popfl"
			  : "=r" (flags), "=r" (ac));
	if ((ac & (1 << 21)) == 0)
	    return 1;
	__asm__ volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1"
			  : "=a" (eax), "=r" (ebx),
			  "=c" (ecx), "=d" (edx)
			  : "0" (1));
	return (edx & 1 << 26) ? 0 : 1;
    }
    ]])],[ac_cv_test_x86_x87=yes],[],[ac_cv_test_x86_x87=no])
elif test $cpu = arm; then
    AC_RUN_IFELSE([AC_LANG_SOURCE([[
    #include <stdio.h>
    int main(void) {
    #if defined(__linux__)
	FILE	*fp;
	char	 buf[128];
	if ((fp = fopen("/proc/cpuinfo", "r")) == NULL)
	    return 1;
	while (fgets(buf, sizeof(buf), fp)) {
	    if (strncmp(buf, "Features\t:", 10) == 0 &&
		strstr(buf + 10, "thumb")) {
		fclose(fp);
		return 0;
	    }
	}
	fclose(fp);
    #elif defined(__thumb2__)
	return 0;
    #endif
	return 1;
    }
    ]])],[ac_cv_test_arm_arm=yes],[],[ac_cv_test_arm_arm=no])
    AC_RUN_IFELSE([AC_LANG_SOURCE([[
    #include <stdio.h>
    int main(void) {
    #if defined(__linux__)
	FILE	*fp;
	char	 buf[128];
    #  if !defined(__ARM_PCS_VFP)
	if ((fp = fopen("/proc/cpuinfo", "r")) == NULL)
	    return 1;
	while (fgets(buf, sizeof(buf), fp)) {
	    if (strncmp(buf, "Features\t:", 10) == 0 &&
		strstr(buf + 10, "vfp")) {
		fclose(fp);
		return 0;
	    }
	}
	fclose(fp);
    #  endif
    #endif
	return 1;
    }
    ]])],[ac_cv_test_arm_swf=yes],[],[ac_cv_test_arm_swf=no])
fi
CFLAGS=$save_CFLAGS

AM_CONDITIONAL(test_x86_x87, [test x$ac_cv_test_x86_x87 = xyes])
AM_CONDITIONAL(test_arm_arm, [test x$ac_cv_test_arm_arm = xyes])
AM_CONDITIONAL(test_arm_swf, [test x$ac_cv_test_arm_swf = xyes])

AM_CONDITIONAL(test_nodata, [test cpu-$cpu = cpu-mips -o cpu-$cpu = cpu-ppc -o cpu-$cpu = cpu-sparc -o cpu-$cpu = cpu-x86 -o cpu-$cpu = cpu-ia64 -o cpu-$cpu = cpu-hppa -o cpu-$cpu = cpu-s390 -o cpu-$cpu = cpu-alpha])

if test $cpu = arm; then
     AC_CHECK_LIB(m, sqrtf, ,
        [AC_MSG_ERROR([sqrtf required but not available])])
fi
AC_SUBST(cpu)

AC_SUBST([LIGHTNING_CFLAGS])