🚀 go-pugleaf

In article <1992Oct5.123837.28122@wsl.ie> jja@wsl.ie (John J. Allen) writes:
>Well 2.1 packs struct's automatically and 2.2.2 does not. I have not found
>a way to do this. This is a real pain if you use any system calls.

[Warning: The following applies to gcc/2.  I know nothing about EMXGCC]

The version of gcc 2.2.2 that I am using *does* support packing structs
by using a #pragma option.  ``#pragma pack(n)'' where n is the desired
alignment that you want for structs will cause all structs declared
after the #pragma to be given alignment on n-byte boundaries.

For example, to declare a struct with byte (i.e. packed) alignment, you
could write:
]#pragma pack(1)  /* Start byte alignment */
]struct foo {
]    unsigned char one;
]    long two;		/* This field starts at offset 2 in the struct */
]};
]#pragma pack(4)  /* Restore default quadword alignment for efficiency */

The default if you do not use any pragma statements is pack(4).  It is
advisable to restore pack(4) after you declare everything that needs pack(1).

The OS/2 headers for gcc/2 are *full* of pack pragmas.
-
Colin Jensen
cjensen@ampex.com	ljensen@netcom.netcom.com