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In article <BwFKGs.J1s@mtholyoke.edu> jbotz@mtholyoke.edu (Jurgen Botz) writes:

> I've been using gcc on DECstations for a couple of years now (always
> pretty much the latest version of gcc and Ultrix) and have
> consistently had problems compiling programs that use stuff declared
> in "time.h".  I've always been able to fix it by making trivial
> changes to the source or Makefiles, but I still haven't figured out
> just exactly what is different between gcc and DEC cc that causes
> these problems to come up so consistently.  DEC's header's are a maze
> of #ifdefs (because they're supposed to work with ANSI, non-ANSI, and
> POSIX sources, compilers, environments), and I figure that gcc is not
> defining something that DEC's MIPS cc is... but what is it?

Having struggled with this some time, I came to the following
solution.

In my gcc copy of time.h (/usr/local/lib/gcc-include/sys/time.h) I
have added another preprocessor conditional 'TIME_T_LONG'. When this
is defined, all time_t entities are treated as long.  If a compilation
fails on type mismatch of time related functions, I add -DTIME_T_LONG
to the compiler flags and usually -- bingo!

It probably violates some standards, but it is a useful work-around.

These are the diffs (based on Ultrix 4.0):

*** /usr/include/sys/time.h	Tue Oct  2 20:11:23 1990
--- /usr/local/lib/gcc-include/sys/time.h	Wed Oct 21 11:27:33 1992
***************
*** 158,176 ****
  
  #ifndef KERNEL
  #ifdef __STDC__
  /*
   * prototypes
   */
  extern char *		asctime( struct tm *__tm );
  extern clock_t		clock( void );
! extern char *		ctime( time_t *__clock ); 
! extern double		difftime( time_t __time1, time_t __time0 );
! extern struct tm *	gmtime( time_t *__clock );
! extern struct tm *	localtime( time_t *__clock );
! extern time_t		mktime( struct tm *__timeptr );
  extern size_t		strftime( char *__s, size_t __maxsize,
  				char *__format, struct tm *__tm );
! extern time_t		time( time_t *__tloc );	
  
  #else
  extern	struct tm *gmtime(), *localtime();
--- 158,182 ----
  
  #ifndef KERNEL
  #ifdef __STDC__
+ #ifdef TIME_T_LONG
+ # define ___TIME_T long
+ #else
+ # define ___TIME_T time_t
+ #endif
+ 
  /*
   * prototypes
   */
  extern char *		asctime( struct tm *__tm );
  extern clock_t		clock( void );
! extern char *		ctime( ___TIME_T *__clock ); 
! extern double		difftime( ___TIME_T __time1, ___TIME_T __time0 );
! extern struct tm *	gmtime( ___TIME_T *__clock );
! extern struct tm *	localtime( ___TIME_T *__clock );
! extern ___TIME_T	mktime( struct tm *__timeptr );
  extern size_t		strftime( char *__s, size_t __maxsize,
  				char *__format, struct tm *__tm );
! extern ___TIME_T	time( ___TIME_T *__tloc );
  
  #else
  extern	struct tm *gmtime(), *localtime();
--
Johan Vromans				       jv@mh.nl via internet backbones
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