nanogui: Re: ARM, C++ and -mstructure-size-boundary=8
Subject:
Re: [nanogui] FW: ARM, C++ and -mstructure-size-boundary=8
From:
"Greg Haerr" ####@####.####
Date:
26 Sep 2002 01:09:20 -0000
Message-Id: <068a01c264f8$26ec90e0$3aba46a6@xmission.com>
: When linking a C++ program to microwindows, we found out that the size of
: the MWPALENTRY structure was 4 bytes in the C++ routines and 3 bytes in
: Microwindows code (in C).
:
: I also noticed that microwindows was compiled, for the ARM targets, with
: -mstructure-boundary-size=8. I didnt compile the C++ program with this
: option, but I removed it from the microwindows source code and now the
: sizeof(MWPALENTRY) is always 4.
:
: I noticed in the changelog that this gcc option was supposed to fix a bug,
: can someone tell me more about this ?
You've basically found the bug and the original solution. The
CVS version of Microwindows adds a dummy UCHAR to the
MWPALENTRY structure so that the -mstructure-boundary-size
option should no longer be needed.
I originally ran into this when porting Doom to Nano-X/ARM, since
Doom requires byte-padded rather than long-padded structures.
Regards,
Greg
