[Mono-dev] Linux x86: marshal7.cs failure

[Rodrigo Kumpera]

Linux and OSX have different alignment rules, that's why the difference.

This was fixed a few months back on master. If it's failing please file a
bug report.

--
Rodrigo


On Thu, Jun 19, 2014 at 2:19 PM, Damien Diederen <dd at crosstwine.com> wrote:

>
> Hello,
>
> I am observing the following failure on Linux 86:
>
>     $ cd mono/tests
>     $ mono marshal7.exe; echo $?
>     14
>
> which corresponds to the following check:
>
>     if (Marshal.SizeOf (typeof (TestStruct8)) != 16)
>         return 14;
>
> My current build of Mono returns 12.  Which seems reasonable according
> to GCC (on the same machine, and on any 32-bit Linux I could test it
> on):
>
>     $ cat > foo.c
>     #include <stdio.h>
>     #include <stddef.h>
>     #include <stdint.h>
>
>     struct TestStruct8 {
>             int a;
>             uint64_t b;
>     };
>
>     int main(int argc, char **argv) {
>             size_t size = sizeof(struct TestStruct8);
>             size_t offset_a = offsetof(struct TestStruct8, a);
>             size_t offset_b = offsetof(struct TestStruct8, b);
>
>             printf("Size: %zu, Offset A: %zu, Offset B: %zu\n",
>                    size, offset_a, offset_b);
>             return 0;
>     }
>     ^D
>     $ gcc -m32 -g -Wall -o foo foo.c
>     $ ./foo
>     Size: 12, Offset A: 0, Offset B: 4
>
> Could the test be wrong, and should 32-bit Linux be folded with OS X:
>
>     if (IsOSX () && IntPtr.Size == 4) {
>             if (Marshal.SizeOf (typeof (TestStruct8)) != 12)
>                     return 14;
>             ...
>
> The test was last modified with the fix to Bug #4510, which is
> relatively recent; could it be that it has not been verified on a 32-bit
> Linux machine yet?
>
> Thanks,
> Damien
>
> --
> http://crosstwine.com
> tel:  +49 89 2189 2939
> cell: +49 174 3489 428
>
> “Strong Opinions, Weakly Held”
>                  — Bob Johansen
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