550 lines
14 KiB
C
550 lines
14 KiB
C
/* Specific flags and argument handling of the Fortran front-end.
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Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003
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Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* This file contains a filter for the main `gcc' driver, which is
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replicated for the `g77' driver by adding this filter. The purpose
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of this filter is to be basically identical to gcc (in that
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it faithfully passes all of the original arguments to gcc) but,
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unless explicitly overridden by the user in certain ways, ensure
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that the needs of the language supported by this wrapper are met.
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For GNU Fortran (g77), we do the following to the argument list
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before passing it to `gcc':
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1. Make sure `-lg2c -lm' is at the end of the list.
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2. Make sure each time `-lg2c' or `-lm' is seen, it forms
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part of the series `-lg2c -lm'.
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#1 and #2 are not done if `-nostdlib' or any option that disables
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the linking phase is present, or if `-xfoo' is in effect. Note that
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a lack of source files or -l options disables linking.
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This program was originally made out of gcc/cp/g++spec.c, but the
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way it builds the new argument list was rewritten so it is much
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easier to maintain, improve the way it decides to add or not add
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extra arguments, etc. And several improvements were made in the
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handling of arguments, primarily to make it more consistent with
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`gcc' itself. */
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#include "config.h"
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#include "system.h"
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#include "gcc.h"
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#ifndef MATH_LIBRARY
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#define MATH_LIBRARY "-lm"
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#endif
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#ifndef FORTRAN_INIT
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#define FORTRAN_INIT "-lfrtbegin"
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#endif
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#ifndef FORTRAN_LIBRARY
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#define FORTRAN_LIBRARY "-lg2c"
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#endif
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/* Options this driver needs to recognize, not just know how to
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skip over. */
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typedef enum
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{
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OPTION_b, /* Aka --prefix. */
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OPTION_B, /* Aka --target. */
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OPTION_c, /* Aka --compile. */
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OPTION_driver, /* Wrapper-specific option. */
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OPTION_E, /* Aka --preprocess. */
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OPTION_help, /* --help. */
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OPTION_i, /* -imacros, -include, -include-*. */
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OPTION_l,
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OPTION_L, /* Aka --library-directory. */
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OPTION_M, /* Aka --dependencies. */
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OPTION_MM, /* Aka --user-dependencies. */
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OPTION_nostdlib, /* Aka --no-standard-libraries, or
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-nodefaultlibs. */
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OPTION_o, /* Aka --output. */
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OPTION_S, /* Aka --assemble. */
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OPTION_syntax_only, /* -fsyntax-only. */
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OPTION_v, /* Aka --verbose. */
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OPTION_version, /* --version. */
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OPTION_V, /* Aka --use-version. */
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OPTION_x, /* Aka --language. */
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OPTION_ /* Unrecognized or unimportant. */
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} Option;
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/* The original argument list and related info is copied here. */
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static int g77_xargc;
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static const char *const *g77_xargv;
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static void lookup_option PARAMS ((Option *, int *, const char **,
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const char *));
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static void append_arg PARAMS ((const char *));
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/* The new argument list will be built here. */
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static int g77_newargc;
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static const char **g77_newargv;
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#ifndef SWITCH_TAKES_ARG
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#define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
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#endif
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#ifndef WORD_SWITCH_TAKES_ARG
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#define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
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#endif
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/* Assumes text[0] == '-'. Returns number of argv items that belong to
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(and follow) this one, an option id for options important to the
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caller, and a pointer to the first char of the arg, if embedded (else
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returns NULL, meaning no arg or it's the next argv).
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Note that this also assumes gcc.c's pass converting long options
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to short ones, where available, has already been run. */
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static void
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lookup_option (xopt, xskip, xarg, text)
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Option *xopt;
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int *xskip;
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const char **xarg;
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const char *text;
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{
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Option opt = OPTION_;
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int skip;
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const char *arg = NULL;
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if ((skip = SWITCH_TAKES_ARG (text[1])))
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skip -= (text[2] != '\0'); /* See gcc.c. */
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if (text[1] == 'B')
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opt = OPTION_B, skip = (text[2] == '\0'), arg = text + 2;
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else if (text[1] == 'b')
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opt = OPTION_b, skip = (text[2] == '\0'), arg = text + 2;
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else if ((text[1] == 'c') && (text[2] == '\0'))
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opt = OPTION_c, skip = 0;
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else if ((text[1] == 'E') && (text[2] == '\0'))
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opt = OPTION_E, skip = 0;
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else if (text[1] == 'i')
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opt = OPTION_i, skip = 0;
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else if (text[1] == 'l')
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opt = OPTION_l;
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else if (text[1] == 'L')
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opt = OPTION_L, arg = text + 2;
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else if (text[1] == 'o')
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opt = OPTION_o;
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else if ((text[1] == 'S') && (text[2] == '\0'))
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opt = OPTION_S, skip = 0;
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else if (text[1] == 'V')
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opt = OPTION_V, skip = (text[2] == '\0');
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else if ((text[1] == 'v') && (text[2] == '\0'))
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opt = OPTION_v, skip = 0;
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else if (text[1] == 'x')
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opt = OPTION_x, arg = text + 2;
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else
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{
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if ((skip = WORD_SWITCH_TAKES_ARG (text + 1)) != 0) /* See gcc.c. */
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;
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else if (! strncmp (text, "-fdriver", 8)) /* Really --driver!! */
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opt = OPTION_driver; /* Never mind arg, this is unsupported. */
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else if (! strcmp (text, "-fhelp")) /* Really --help!! */
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opt = OPTION_help;
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else if (! strcmp (text, "-M"))
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opt = OPTION_M;
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else if (! strcmp (text, "-MM"))
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opt = OPTION_MM;
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else if (! strcmp (text, "-nostdlib")
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|| ! strcmp (text, "-nodefaultlibs"))
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opt = OPTION_nostdlib;
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else if (! strcmp (text, "-fsyntax-only"))
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opt = OPTION_syntax_only;
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else if (! strcmp (text, "-dumpversion"))
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opt = OPTION_version;
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else if (! strcmp (text, "-fversion")) /* Really --version!! */
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opt = OPTION_version;
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else if (! strcmp (text, "-Xlinker")
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|| ! strcmp (text, "-specs"))
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skip = 1;
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else
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skip = 0;
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}
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if (xopt != NULL)
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*xopt = opt;
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if (xskip != NULL)
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*xskip = skip;
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if (xarg != NULL)
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{
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if ((arg != NULL)
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&& (arg[0] == '\0'))
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*xarg = NULL;
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else
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*xarg = arg;
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}
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}
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/* Append another argument to the list being built. As long as it is
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identical to the corresponding arg in the original list, just increment
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the new arg count. Otherwise allocate a new list, etc. */
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static void
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append_arg (arg)
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const char *arg;
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{
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static int newargsize;
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#if 0
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fprintf (stderr, "`%s'\n", arg);
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#endif
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if (g77_newargv == g77_xargv
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&& g77_newargc < g77_xargc
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&& (arg == g77_xargv[g77_newargc]
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|| ! strcmp (arg, g77_xargv[g77_newargc])))
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{
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++g77_newargc;
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return; /* Nothing new here. */
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}
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if (g77_newargv == g77_xargv)
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{ /* Make new arglist. */
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int i;
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newargsize = (g77_xargc << 2) + 20; /* This should handle all. */
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g77_newargv = (const char **) xmalloc (newargsize * sizeof (char *));
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/* Copy what has been done so far. */
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for (i = 0; i < g77_newargc; ++i)
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g77_newargv[i] = g77_xargv[i];
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}
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if (g77_newargc == newargsize)
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fatal ("overflowed output arg list for `%s'", arg);
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g77_newargv[g77_newargc++] = arg;
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}
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void
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lang_specific_driver (in_argc, in_argv, in_added_libraries)
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int *in_argc;
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const char *const **in_argv;
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int *in_added_libraries ATTRIBUTE_UNUSED;
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{
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int argc = *in_argc;
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const char *const *argv = *in_argv;
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int i;
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int verbose = 0;
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Option opt;
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int skip;
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const char *arg;
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/* This will be NULL if we encounter a situation where we should not
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link in libf2c. */
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const char *library = FORTRAN_LIBRARY;
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/* 0 => -xnone in effect.
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1 => -xfoo in effect. */
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int saw_speclang = 0;
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/* 0 => initial/reset state
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1 => last arg was -l<library>
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2 => last two args were -l<library> -lm. */
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int saw_library = 0;
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/* 0 => initial/reset state
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1 => FORTRAN_INIT linked in */
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int use_init = 0;
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/* By default, we throw on the math library if we have one. */
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int need_math = (MATH_LIBRARY[0] != '\0');
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/* The number of input and output files in the incoming arg list. */
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int n_infiles = 0;
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int n_outfiles = 0;
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#if 0
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fprintf (stderr, "Incoming:");
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for (i = 0; i < argc; i++)
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fprintf (stderr, " %s", argv[i]);
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fprintf (stderr, "\n");
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#endif
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g77_xargc = argc;
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g77_xargv = argv;
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g77_newargc = 0;
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g77_newargv = (const char **) argv;
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/* First pass through arglist.
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If -nostdlib or a "turn-off-linking" option is anywhere in the
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command line, don't do any library-option processing (except
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relating to -x). Also, if -v is specified, but no other options
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that do anything special (allowing -V version, etc.), remember
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to add special stuff to make gcc command actually invoke all
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the different phases of the compilation process so all the version
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numbers can be seen.
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Also, here is where all problems with missing arguments to options
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are caught. If this loop is exited normally, it means all options
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have the appropriate number of arguments as far as the rest of this
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program is concerned. */
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for (i = 1; i < argc; ++i)
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{
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if ((argv[i][0] == '+') && (argv[i][1] == 'e'))
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{
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continue;
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}
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if ((argv[i][0] != '-') || (argv[i][1] == '\0'))
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{
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++n_infiles;
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continue;
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}
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lookup_option (&opt, &skip, NULL, argv[i]);
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switch (opt)
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{
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case OPTION_nostdlib:
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case OPTION_c:
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case OPTION_S:
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case OPTION_syntax_only:
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case OPTION_E:
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case OPTION_M:
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case OPTION_MM:
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/* These options disable linking entirely or linking of the
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standard libraries. */
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library = 0;
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break;
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case OPTION_l:
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++n_infiles;
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break;
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case OPTION_o:
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++n_outfiles;
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break;
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case OPTION_v:
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verbose = 1;
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break;
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case OPTION_b:
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case OPTION_B:
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case OPTION_L:
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case OPTION_i:
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case OPTION_V:
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/* These options are useful in conjunction with -v to get
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appropriate version info. */
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break;
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case OPTION_version:
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printf ("\
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GNU Fortran (GCC) %s\n\
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Copyright (C) 2002 Free Software Foundation, Inc.\n\
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\n\
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GNU Fortran comes with NO WARRANTY, to the extent permitted by law.\n\
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You may redistribute copies of GNU Fortran\n\
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under the terms of the GNU General Public License.\n\
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For more information about these matters, see the file named COPYING\n\
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or type the command `info -f g77 Copying'.\n\
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", version_string);
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exit (0);
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break;
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case OPTION_help:
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/* Let gcc.c handle this, as it has a really
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cool facility for handling --help and --verbose --help. */
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return;
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case OPTION_driver:
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fatal ("--driver no longer supported");
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break;
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default:
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break;
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}
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/* This is the one place we check for missing arguments in the
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program. */
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if (i + skip < argc)
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i += skip;
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else
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fatal ("argument to `%s' missing", argv[i]);
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}
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if ((n_outfiles != 0) && (n_infiles == 0))
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fatal ("no input files; unwilling to write output files");
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/* If there are no input files, no need for the library. */
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if (n_infiles == 0)
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library = 0;
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/* Second pass through arglist, transforming arguments as appropriate. */
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append_arg (argv[0]); /* Start with command name, of course. */
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for (i = 1; i < argc; ++i)
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{
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if (argv[i][0] == '\0')
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{
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append_arg (argv[i]); /* Interesting. Just append as is. */
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continue;
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}
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if ((argv[i][0] == '-') && (argv[i][1] != 'l'))
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{
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/* Not a filename or library. */
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if (saw_library == 1 && need_math) /* -l<library>. */
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append_arg (MATH_LIBRARY);
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saw_library = 0;
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lookup_option (&opt, &skip, &arg, argv[i]);
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if (argv[i][1] == '\0')
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{
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append_arg (argv[i]); /* "-" == Standard input. */
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continue;
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}
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if (opt == OPTION_x)
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{
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/* Track input language. */
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const char *lang;
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if (arg == NULL)
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lang = argv[i+1];
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else
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lang = arg;
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saw_speclang = (strcmp (lang, "none") != 0);
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}
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append_arg (argv[i]);
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for (; skip != 0; --skip)
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append_arg (argv[++i]);
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continue;
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}
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/* A filename/library, not an option. */
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if (saw_speclang)
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saw_library = 0; /* -xfoo currently active. */
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else
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{ /* -lfoo or filename. */
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if (strcmp (argv[i], MATH_LIBRARY) == 0
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#ifdef ALT_LIBM
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|| strcmp (argv[i], ALT_LIBM) == 0
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#endif
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)
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{
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if (saw_library == 1)
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saw_library = 2; /* -l<library> -lm. */
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else
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{
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if (0 == use_init)
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{
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append_arg (FORTRAN_INIT);
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use_init = 1;
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}
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append_arg (FORTRAN_LIBRARY);
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}
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}
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else if (strcmp (argv[i], FORTRAN_LIBRARY) == 0)
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saw_library = 1; /* -l<library>. */
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else
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{ /* Other library, or filename. */
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if (saw_library == 1 && need_math)
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append_arg (MATH_LIBRARY);
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saw_library = 0;
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}
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}
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append_arg (argv[i]);
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}
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/* Append `-lg2c -lm' as necessary. */
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if (library)
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{ /* Doing a link and no -nostdlib. */
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if (saw_speclang)
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append_arg ("-xnone");
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switch (saw_library)
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{
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case 0:
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if (0 == use_init)
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{
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append_arg (FORTRAN_INIT);
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use_init = 1;
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}
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append_arg (library);
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case 1:
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if (need_math)
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append_arg (MATH_LIBRARY);
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default:
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break;
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}
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}
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#ifdef ENABLE_SHARED_LIBGCC
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if (library)
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{
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int i;
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for (i = 1; i < g77_newargc; i++)
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if (g77_newargv[i][0] == '-')
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if (strcmp (g77_newargv[i], "-static-libgcc") == 0
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|| strcmp (g77_newargv[i], "-static") == 0)
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break;
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if (i == g77_newargc)
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append_arg ("-shared-libgcc");
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}
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#endif
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if (verbose
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&& g77_newargv != g77_xargv)
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{
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fprintf (stderr, "Driving:");
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for (i = 0; i < g77_newargc; i++)
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fprintf (stderr, " %s", g77_newargv[i]);
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fprintf (stderr, "\n");
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}
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*in_argc = g77_newargc;
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*in_argv = g77_newargv;
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}
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/* Called before linking. Returns 0 on success and -1 on failure. */
|
|
int lang_specific_pre_link () /* Not used for F77. */
|
|
{
|
|
return 0;
|
|
}
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|
|
|
/* Number of extra output files that lang_specific_pre_link may generate. */
|
|
int lang_specific_extra_outfiles = 0; /* Not used for F77. */
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|
|
|
/* Table of language-specific spec functions. */
|
|
const struct spec_function lang_specific_spec_functions[] =
|
|
{
|
|
{ 0, 0 }
|
|
};
|