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armcc

Note: This was originally posted on 5th April 2013 at http://forums.arm.com

Is there a compiler option or pragma that allows me to see "padding" in c structure?

typedef struct st
{
char a;
int b;
} mytype; Basically, say I have above defined struct then I wish to known how compiler pads it.

list file does not seem to provide the needed details.

--diag_warning=1301
--diag_warning=2530

I tried above options, it shows warning when ever the compiler pads but the issue is i still do
not get how many bytes and where the padding is applied in the structure.

is there a easy way to get those two details ?

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Scott Douglass over 12 years ago

Note: This was originally posted on 8th April 2013 at http://forums.arm.com

I don't think there is a way to get the compiler to be more specific about the padding. The structure layout rules are in section 4 of the ABI http://infocenter.ar...042e/index.html. You could manually add 'char dummy1;' members until the padding warnings go away and then you'll know that you've identified all of the padding.
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Scott Douglass over 12 years ago

Note: This was originally posted on 8th April 2013 at http://forums.arm.com

I don't think there is a way to get the compiler to be more specific about the padding. The structure layout rules are in section 4 of the ABI http://infocenter.ar...042e/index.html. You could manually add 'char dummy1;' members until the padding warnings go away and then you'll know that you've identified all of the padding.
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