code.delx.au - gnu-emacs/blob - src/prefix-args.c

   1 /* prefix-args.c - echo each argument, prefixed by a string.
   2    Jim Blandy <jimb@occs.cs.oberlin.edu> - September 1992
   3
   4    When using GCC 2 as the linker in the build process, options
   5    intended for the linker need to be prefixed with the "-Xlinker"
   6    option.  If an option takes an argument, we need to use -Xlinker
   7    twice - once for the option and once for its argument.  For
   8    example, to run the linker with the options "-Bstatic" "-e"
   9    "_start", you'd need to pass the following options to GCC:
  10
  11    -Xlinker -Bstatic -Xlinker -e -Xlinker _start.
  12
  13    The Emacs makefile used to use a Bourne Shell `for' loop to prefix
  14    each linker option with "-Xlinker", but 1) the for loop was hairier
  15    than one might hope because it had to work when there were no
  16    arguments to pass to the linker - the shell barfs on a loop like
  17    this:
  18
  19        for arg in ; do echo -Xlinker "$arg"; done
  20
  21    and 2) the whole compilation command containing this loop seems to
  22    exit with a non-zero status and halt the build under Ultrix.
  23
  24    If I can't write a completely portable program to do this in C,
  25    I'm quitting and taking up gardening.  */
  26
  27 #include <stdio.h>
  28
  29 main (argc, argv)
  30      int argc;
  31      char **argv;
  32 {
  33   char *progname;
  34   char *prefix;
  35
  36   progname = argv[0];
  37   argc--, argv++;
  38
  39   if (argc < 1)
  40     {
  41       fprintf (stderr, "Usage: %s PREFIX ARGS...\n\
  42 Echo each ARG preceded by PREFIX and a space.\n", progname);
  43       exit (2);
  44     }
  45
  46   prefix = argv[0];
  47   argc--, argv++;
  48
  49   for (; argc > 0; argc--, argv++)
  50     printf ("%s %s%c", prefix, argv[0], (argc > 1) ? ' ' : '\n');
  51
  52   exit (0);
  53 }