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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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Simha JKC over 12 years ago

Note: This was originally posted on 9th April 2013 at http://forums.arm.com

thanks for sharing additional information.

@scott:   your suggested idea is not feasible as i am dealing with structures that are huge i.e., size is in 100s of KBs with many types of data types [size="2"]used in struct
[/size]
@archie: i tried using "--remarks" it still does not help as it does not provide padding size and also the place where it is padding. below is the compile log

C:\c>armcc --remarks 1.c
"1.c", line 3: #1301-D: padding inserted in struct st
"1.c", line 3: #2530-D: padding added to end of struct st
"1.c", line 14: #181-D: argument is incompatible with corresponding format string conversion
printf ("sizeof (me) = %d \n",sizeof(me));
                             ^
"1.c", line 16: Warning: #1-D: last line of file ends without a newline
}
   ^
1.c: 1 warning, 0 errors

C:\c>

recently i tried "fromelf" with option "--expandarrays" and even that is not helping me.
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Simha JKC over 12 years ago

Note: This was originally posted on 9th April 2013 at http://forums.arm.com

thanks for sharing additional information.

@scott:   your suggested idea is not feasible as i am dealing with structures that are huge i.e., size is in 100s of KBs with many types of data types [size="2"]used in struct
[/size]
@archie: i tried using "--remarks" it still does not help as it does not provide padding size and also the place where it is padding. below is the compile log

C:\c>armcc --remarks 1.c
"1.c", line 3: #1301-D: padding inserted in struct st
"1.c", line 3: #2530-D: padding added to end of struct st
"1.c", line 14: #181-D: argument is incompatible with corresponding format string conversion
printf ("sizeof (me) = %d \n",sizeof(me));
                             ^
"1.c", line 16: Warning: #1-D: last line of file ends without a newline
}
   ^
1.c: 1 warning, 0 errors

C:\c>

recently i tried "fromelf" with option "--expandarrays" and even that is not helping me.
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