Date: Sun, 17 Jul 1994 22:30:26 +0100
To: djgpp AT sun DOT soe DOT clarkson DOT edu
From: mag1007 AT hermes DOT cam DOT ac DOT uk (Martin Granell)
Subject: Re: logging errors

        There are two decent solutions. (The third is setting the GO32 
environment variable, but that has some peoblems with pre-compiling.)

                1) Get 4DOS, one of the best pieces of shareware written. it 
allows you to redirect errors simply:
                        gcc ...... >& errorfile
                                (does stderr and stdout)
                or
                        gcc ...... >&> errorfile
                                (just stderr)

                2) Use redirect, but it's slower (needs to load up go32 an 
extra time.)

        Here's a program that redirects stderr to stdout. Do:
                redirect -e <errorfilename> gcc .......
                        or put it in the makefile..
           or to redirect all (quicker):
                redirect -e <errorfilename> make       

********************** CUT HERE ************************************

/*
** redirect -- feed line to shell with stdin/stdout/stderr redirected
**
** usage -- redirect [-i newin] [-o newout] [-e newerr] command
**
** executes command via the shell, but redirects stdin/stdout/stderr first.
** stdout/stderr are appended, not overwritten.
*/

#include <stdio.h>

extern char *strcat( char *, char * );
extern char *strcpy( char *, char * );
extern int system( char * );
extern void exit( int );
extern int errno;
char umsg[] = "usage: redirect [-i newin] [-o newout] [-e newerr] command\n";
char emsg[] = "can't redirect %s to %s\n";

void main ( int, char ** );
void main ( argc, argv )
	int argc;
	char **argv;
	{
	int result;
	char buf[5120];

	argc--;  argv++;
	if (!argc) {
		fprintf( stderr, umsg );
		exit( 0 );
		}
	while (**argv == '-') {
		if (*(*argv+1) == 'i') {
			argc--;  argv++;
			if (!freopen( *argv, "r", stdin )) {
				fprintf( stderr, emsg, "stdin", *argv );
				exit( 1 );
				}
			}
		else if (*(*argv+1) == 'o') {
			argc--;  argv++;
			if (!freopen( *argv, "a", stdout )) {
				fprintf( stderr, emsg, "stdout", *argv );
				exit( 1 );
				}
			}
		else if (*(*argv+1) == 'e') {
			argc--;  argv++;
			if (!freopen( *argv, "a", stderr )) {
				fprintf( stderr, emsg, "stderr", *argv );
				exit( 1 );
				}
			}
		else
			fprintf( stderr, "unknown option %c\n", *(*argv+1) );
		argc--;  argv++;
		}
	if (!argc) {
		fprintf( stderr, umsg );
		exit( 0 );
		}
	strcpy( buf, *argv++ );
	while (*argv)
		strcat( strcat( buf, " " ), *argv++ );
	if (result = system( buf ))
		fprintf( stderr, "exit code = %d, errno = %d\n", result,
			errno );
	exit( 0 );
	}