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GCC 4.7.0 breaks __attribute__((packed)) behavior on... (Developers)

posted by RayeR , CZ, 05.09.2012, 03:46

I don't want/have time for long philosophic discussion about portable code, different C compilers, why need packed structures, etc...
I just giving a warning, that new gcc since ver 4.7.0 changed default bahavior of attribute packed (-mms-bitfields become default) that may affect older SW when recompiling. I see it as very serious change. I understand this was done for some reasons of compatability with M$ and/or 64bit stuff but I don't agree with this way. Attribute packed should be left to always pack the structure to minimum size without padding (otherwise I would't use this attribute at all) and they could introduce some new attribute ms_packed...

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DOS gives me freedom to unlimited HW access.

Complete thread:

• GCC 4.7.0 breaks __attribute__((packed)) behavior on... - RayeR, 04.09.2012, 18:53
  • GCC 4.7.0 breaks __attribute__((packed)) behavior on... - Rugxulo, 04.09.2012, 23:16
    • GCC 4.7.0 breaks __attribute__((packed)) behavior on... - RayeR, 05.09.2012, 03:46
      • GCC 4.7.0 breaks __attribute__((packed)) behavior on... - Rugxulo, 05.09.2012, 11:26
        • GCC 4.7.0 breaks __attribute__((packed)) behavior on... - RayeR, 05.09.2012, 19:09