gcc/cp/g++spec.c

   1 #include <sys/types.h>
   2 #include <stdio.h>
   3
   4 #include "config.h"
   5 #include "gansidecl.h"
   6
   7 /* This bit is set if we saw a `-xfoo' language specification.  */
   8 #define LANGSPEC        (1<<1)
   9 /* This bit is set if they did `-lm' or `-lmath'.  */
  10 #define MATHLIB         (1<<2)
  11 /* This bit is set if they did `-lc'.  */
  12 #define WITHLIBC        (1<<3)
  13
  14 #ifndef MATH_LIBRARY
  15 #define MATH_LIBRARY "-lm"
  16 #endif
  17
  18 extern char *xmalloc PROTO((size_t));
  19
  20 void
  21 lang_specific_driver (fn, in_argc, in_argv)
  22      void (*fn)();
  23      int *in_argc;
  24      char ***in_argv;
  25 {
  26   int i, j;
  27
  28   /* If non-zero, the user gave us the `-v' flag.  */
  29   int saw_verbose_flag = 0;
  30
  31   /* This will be 0 if we encounter a situation where we should not
  32      link in libstdc++.  */
  33   int library = 1;
  34
  35   /* The number of arguments being added to what's in argv, other than
  36      libraries.  We use this to track the number of times we've inserted
  37      -xc++/-xnone.  */
  38   int added = 2;
  39
  40   /* Used to track options that take arguments, so we don't go wrapping
  41      those with -xc++/-xnone.  */
  42   char *quote = NULL;
  43
  44   /* The new argument list will be contained in this.  */
  45   char **arglist;
  46
  47   /* Non-zero if we saw a `-xfoo' language specification on the
  48      command line.  Used to avoid adding our own -xc++ if the user
  49      already gave a language for the file.  */
  50   int saw_speclang = 0;
  51
  52   /* "-lm" or "-lmath" if it appears on the command line.  */
  53   char *saw_math = 0;
  54
  55   /* "-lc" if it appears on the command line.  */
  56   char *saw_libc = 0;
  57
  58   /* An array used to flag each argument that needs a bit set for
  59      LANGSPEC, MATHLIB, or WITHLIBC.  */
  60   int *args;
  61
  62   /* By default, we throw on the math library.  */
  63   int need_math = 1;
  64
  65   /* The total number of arguments with the new stuff.  */
  66   int argc;
  67
  68   /* The argument list.  */
  69   char **argv;
  70
  71   /* The total number of arguments with the new stuff.  */
  72   int num_args = 1;
  73
  74   argc = *in_argc;
  75   argv = *in_argv;
  76
  77
  78   args = (int *) xmalloc (argc * sizeof (int));
  79   bzero ((char *) args, argc * sizeof (int));
  80
  81   for (i = 1; i < argc; i++)
  82     {
  83       /* If the previous option took an argument, we swallow it here.  */
  84       if (quote)
  85         {
  86           quote = NULL;
  87           continue;
  88         }
  89
  90       /* We don't do this anymore, since we don't get them with minus
  91          signs on them.  */
  92       if (argv[i][0] == '\0' || argv[i][1] == '\0')
  93         continue;
  94
  95       if (argv[i][0] == '-')
  96         {
  97           if (library != 0 && (strcmp (argv[i], "-nostdlib") == 0
  98                                || strcmp (argv[i], "-nodefaultlibs") == 0))
  99             {
 100               library = 0;
 101             }
 102           else if (strcmp (argv[i], "-lm") == 0
 103                    || strcmp (argv[i], "-lmath") == 0
 104 #ifdef ALT_LIBM
 105                    || strcmp (argv[i], ALT_LIBM) == 0
 106 #endif
 107                   )
 108             {
 109               args[i] |= MATHLIB;
 110               need_math = 0;
 111             }
 112           else if (strcmp (argv[i], "-lc") == 0)
 113             args[i] |= WITHLIBC;
 114           else if (strcmp (argv[i], "-v") == 0)
 115             {
 116               saw_verbose_flag = 1;
 117               if (argc == 2)
 118                 {
 119                   /* If they only gave us `-v', don't try to link
 120                      in libg++.  */
 121                   library = 0;
 122                 }
 123             }
 124           else if (strncmp (argv[i], "-x", 2) == 0)
 125             saw_speclang = 1;
 126           else if (((argv[i][2] == '\0'
 127                      && (char *)strchr ("bBVDUoeTuIYmLiA", argv[i][1]) != NULL)
 128                     || strcmp (argv[i], "-Tdata") == 0))
 129             quote = argv[i];
 130           else if (library != 0 && ((argv[i][2] == '\0'
 131                      && (char *) strchr ("cSEM", argv[i][1]) != NULL)
 132                     || strcmp (argv[i], "-MM") == 0))
 133             {
 134               /* Don't specify libraries if we won't link, since that would
 135                  cause a warning.  */
 136               library = 0;
 137               added -= 2;
 138             }
 139           else
 140             /* Pass other options through.  */
 141             continue;
 142         }
 143       else
 144         {
 145           int len;
 146
 147           if (saw_speclang)
 148             {
 149               saw_speclang = 0;
 150               continue;
 151             }
 152
 153           /* If the filename ends in .c or .i, put options around it.
 154              But not if a specified -x option is currently active.  */
 155           len = strlen (argv[i]);
 156           if (len > 2
 157               && (argv[i][len - 1] == 'c' || argv[i][len - 1] == 'i')
 158               && argv[i][len - 2] == '.')
 159             {
 160               args[i] |= LANGSPEC;
 161               added += 2;
 162             }
 163         }
 164     }
 165
 166   if (quote)
 167     (*fn) ("argument to `%s' missing\n", quote);
 168
 169   /* If we know we don't have to do anything, bail now.  */
 170   if (! added && ! library)
 171     {
 172       free (args);
 173       return;
 174     }
 175
 176   num_args = argc + added + need_math;
 177   arglist = (char **) xmalloc (num_args * sizeof (char *));
 178
 179   /* NOTE: We start at 1 now, not 0.  */
 180   for (i = 0, j = 0; i < argc; i++, j++)
 181     {
 182       arglist[j] = argv[i];
 183
 184       /* Make sure -lstdc++ is before the math library, since libstdc++
 185          itself uses those math routines.  */
 186       if (!saw_math && (args[i] & MATHLIB) && library)
 187         {
 188           --j;
 189           saw_math = argv[i];
 190         }
 191
 192       if (!saw_libc && (args[i] & WITHLIBC) && library)
 193         {
 194           --j;
 195           saw_libc = argv[i];
 196         }
 197
 198       /* Wrap foo.c and foo.i files in a language specification to
 199          force the gcc compiler driver to run cc1plus on them.  */
 200       if (args[i] & LANGSPEC)
 201         {
 202           int len = strlen (argv[i]);
 203           if (argv[i][len - 1] == 'i')
 204             arglist[j++] = "-xc++-cpp-output";
 205           else
 206             arglist[j++] = "-xc++";
 207           arglist[j++] = argv[i];
 208           arglist[j] = "-xnone";
 209         }
 210   }
 211
 212   /* Add `-lstdc++' if we haven't already done so.  */
 213   if (library)
 214     arglist[j++] = "-lstdc++";
 215   if (saw_math)
 216     arglist[j++] = saw_math;
 217   else if (library)
 218     arglist[j++] = MATH_LIBRARY;
 219   if (saw_libc)
 220     arglist[j++] = saw_libc;
 221
 222   arglist[j] = NULL;
 223
 224   *in_argc = j;
 225   *in_argv = arglist;
 226 }