Didier Barvaux wrote:
On a structure such as: struct mystruct1 { unsigned int mystruct1_foo:4; unsigned int mystruct1_bar:4; uint8_t mystruct1_other; uint16_t mystruct1_other2; };The 2 first fields uses 1 byte with GCC/Clang while they use sizeof(unsigned int) bytes with TCC. GCC/Clang pack the bit fields on the smaller type available. So, sizeof(struct mystruct1) = 4 with GCC/Clang and sizeof(struct mystruct1) = 8 with TCC.
I tried your "bitfield.c" test with GCC and it failed on the 2nd assertion. Hm ... --- grischka
My program (and probably many others, as the struct iphdr for IPv4 header defined by the GNU libc is defined that way) relies on this behaviour. That's why I created the patch. It packs bit fields "the way GCC does". If you got a better description, I'll be happy to change it :)
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