Everything

 

-Xpack


This option performs the structure packing.

[Specification format]

-Xpack=num

 

-

Interpretation when omitted

The structure packing is not performed.

[Detailed description]

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This option performs the structure packing.

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If this option is specified, struct members will not be aligned by their member types, but rather code will be generated with alignment packed to the specified num bytes.

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1, 2, or 4 can be specified as num.
An error will occur if any other item is specified.

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This option can not be specified together with the -Xinline_strcpy option.

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If this option is specified when the structure packing is specified by the #pragma directive in the C source, the value specified by this option is applied to all structures until the first #pragma directive appears.
After that, the value of the #pragma directive is applied.
Even after the #pragma directive has appeared, however, the value specified by the option is applied if the default value is specified (if the value of the packing by the #pragma directive).

[Example of use]

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To generate code with struct member alignment packed to 1 byte, describe as:

>ccrh -Xpack=1 -Xcommon=rh850 main.c