[Tinycc-devel] gcc/tcc nested macros difference

[Sergey Korshunoff]

Hi!
A test file:
#define __le16_to_cpu(x) ((__u16)(x))
#define le16_to_cpu __le16_to_cpu
static void pcnet32_load_multicast (struct net_device *dev)
{
    mcast_table [crc >> 4] = le16_to_cpu(le16_to_cpu(mcast_table [crc
>> 4]) | (1 << (crc & 0xf)));
    return;
}

GCC -E output:
...
    mcast_table [crc >> 4] = ((__u16)(((__u16)(mcast_table [crc >>
4])) | (1 << (crc & 0xf))));

TCC -E output:
...
    mcast_table [crc >> 4] = ((__u16)(__le16_to_cpu(mcast_table [crc
>> 4]) | (1 << (crc & 0xf))))

Look at the __ie16_to_cpu presence in the tcc output: nested macro was
not expanded.