🚀 go-pugleaf

I discovered at least one C include file, stat.h, which changes the C
compiler's alignment mode to nomember_alignment.  The default is
member_alignment, which generates better code.  If you have two source
files which include the same struct declaration, but one source file
also includes <stat.h>, the structures may not be compatible in terms
of memory layout between the two files.  In stat.h it looks like there
is some attempt to save the member_alignment, but it doesn't get
restored.

$ type inc_stat.c
#include <stat.h>
$ cc/preprocess_only inc_stat.c
$ type inc_stat.i
# 1 "DISK1:[PASCAL.TEST]INC_STAT.C;1"
# 1 "SYS$COMMON:[SYSLIB]DECC$RTLDEF.TLB;1"
#pragma nostandard
#pragma member_alignment __save
#pragma nomember_alignment
typedef unsigned off_t;
typedef unsigned short ino_t;
typedef char *dev_t;
struct stat
{
 dev_t st_dev;
 ino_t st_ino[3];
 unsigned short st_mode;
 int st_nlink;
 unsigned st_uid;
 unsigned short st_gid;
 dev_t st_rdev;
 off_t st_size;
 unsigned st_atime;
 unsigned st_mtime;
 unsigned st_ctime;
 char st_fab_rfm;
 char st_fab_rat;
 char st_fab_fsz;
 unsigned st_fab_mrs;
};
typedef struct stat stat_t;
int stat(char *__file_spec, stat_t *__buffer);
int fstat(int __file_desc, stat_t *__buffer);
unsigned short umask(unsigned short __old_mask);
#pragma standard
-- 
(My opinions do not necessarily represent those of my employer.)
Craig Chamberlain, Software Engineer, Applicon Schlumberger
Ann Arbor, Michigan  chamber@ann-arbor.applicon.slb.com  (313) 995-6310