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111
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1 /* Specific flags and argument handling of the Fortran front-end.
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2 Copyright (C) 1997-2017 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GNU CC is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 GNU CC is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 /* This file is copied more or less verbatim from g77. */
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21 /* This file contains a filter for the main `gcc' driver, which is
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22 replicated for the `gfortran' driver by adding this filter. The purpose
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23 of this filter is to be basically identical to gcc (in that
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24 it faithfully passes all of the original arguments to gcc) but,
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25 unless explicitly overridden by the user in certain ways, ensure
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26 that the needs of the language supported by this wrapper are met.
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27
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28 For GNU Fortran 95(gfortran), we do the following to the argument list
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29 before passing it to `gcc':
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30
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31 1. Make sure `-lgfortran -lm' is at the end of the list.
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32
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33 2. Make sure each time `-lgfortran' or `-lm' is seen, it forms
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34 part of the series `-lgfortran -lm'.
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35
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36 #1 and #2 are not done if `-nostdlib' or any option that disables
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37 the linking phase is present, or if `-xfoo' is in effect. Note that
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38 a lack of source files or -l options disables linking.
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39
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40 This program was originally made out of gcc/cp/g++spec.c, but the
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41 way it builds the new argument list was rewritten so it is much
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42 easier to maintain, improve the way it decides to add or not add
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43 extra arguments, etc. And several improvements were made in the
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44 handling of arguments, primarily to make it more consistent with
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45 `gcc' itself. */
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46
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47 #include "config.h"
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48 #include "system.h"
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49 #include "coretypes.h"
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50 #include "gcc.h"
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51 #include "opts.h"
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52
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53 #include "tm.h"
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54 #include "intl.h"
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55
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56 #ifndef MATH_LIBRARY
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57 #define MATH_LIBRARY "m"
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58 #endif
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59
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60 #ifndef FORTRAN_LIBRARY
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61 #define FORTRAN_LIBRARY "gfortran"
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62 #endif
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63
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64 /* Name of the spec file. */
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65 #define SPEC_FILE "libgfortran.spec"
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66
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67 /* The original argument list and related info is copied here. */
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68 static unsigned int g77_xargc;
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69 static const struct cl_decoded_option *g77_x_decoded_options;
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70 static void append_arg (const struct cl_decoded_option *);
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71
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72 /* The new argument list will be built here. */
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73 static unsigned int g77_newargc;
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74 static struct cl_decoded_option *g77_new_decoded_options;
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75
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76 /* This will be NULL if we encounter a situation where we should not
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77 link in the fortran libraries. */
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78 static const char *library = NULL;
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79
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80
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81 /* Return whether strings S1 and S2 are both NULL or both the same
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82 string. */
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83
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84 static bool
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85 strings_same (const char *s1, const char *s2)
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86 {
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87 return s1 == s2 || (s1 != NULL && s2 != NULL && strcmp (s1, s2) == 0);
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88 }
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89
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90 /* Return whether decoded option structures OPT1 and OPT2 are the
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91 same. */
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92
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93 static bool
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94 options_same (const struct cl_decoded_option *opt1,
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95 const struct cl_decoded_option *opt2)
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96 {
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97 return (opt1->opt_index == opt2->opt_index
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98 && strings_same (opt1->arg, opt2->arg)
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99 && strings_same (opt1->orig_option_with_args_text,
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100 opt2->orig_option_with_args_text)
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101 && strings_same (opt1->canonical_option[0],
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102 opt2->canonical_option[0])
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103 && strings_same (opt1->canonical_option[1],
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104 opt2->canonical_option[1])
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105 && strings_same (opt1->canonical_option[2],
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106 opt2->canonical_option[2])
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107 && strings_same (opt1->canonical_option[3],
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108 opt2->canonical_option[3])
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109 && (opt1->canonical_option_num_elements
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110 == opt2->canonical_option_num_elements)
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111 && opt1->value == opt2->value
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112 && opt1->errors == opt2->errors);
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113 }
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114
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115 /* Append another argument to the list being built. As long as it is
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116 identical to the corresponding arg in the original list, just increment
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117 the new arg count. Otherwise allocate a new list, etc. */
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118
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119 static void
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120 append_arg (const struct cl_decoded_option *arg)
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121 {
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122 static unsigned int newargsize;
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123
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124 if (g77_new_decoded_options == g77_x_decoded_options
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125 && g77_newargc < g77_xargc
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126 && options_same (arg, &g77_x_decoded_options[g77_newargc]))
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127 {
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128 ++g77_newargc;
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129 return; /* Nothing new here. */
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130 }
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131
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132 if (g77_new_decoded_options == g77_x_decoded_options)
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133 { /* Make new arglist. */
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134 unsigned int i;
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135
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136 newargsize = (g77_xargc << 2) + 20; /* This should handle all. */
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137 g77_new_decoded_options = XNEWVEC (struct cl_decoded_option, newargsize);
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138
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139 /* Copy what has been done so far. */
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140 for (i = 0; i < g77_newargc; ++i)
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141 g77_new_decoded_options[i] = g77_x_decoded_options[i];
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142 }
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143
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144 if (g77_newargc == newargsize)
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145 fatal_error (input_location, "overflowed output arg list for %qs",
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146 arg->orig_option_with_args_text);
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147
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148 g77_new_decoded_options[g77_newargc++] = *arg;
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149 }
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150
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151 /* Append an option described by OPT_INDEX, ARG and VALUE to the list
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152 being built. */
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153 static void
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154 append_option (size_t opt_index, const char *arg, int value)
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155 {
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156 struct cl_decoded_option decoded;
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157
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158 generate_option (opt_index, arg, value, CL_DRIVER, &decoded);
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159 append_arg (&decoded);
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160 }
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161
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162 /* Append a libgfortran argument to the list being built. If
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163 FORCE_STATIC, ensure the library is linked statically. */
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164
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165 static void
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166 add_arg_libgfortran (bool force_static ATTRIBUTE_UNUSED)
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167 {
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168 #ifdef HAVE_LD_STATIC_DYNAMIC
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169 if (force_static)
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170 append_option (OPT_Wl_, LD_STATIC_OPTION, 1);
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171 #endif
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172 append_option (OPT_l, FORTRAN_LIBRARY, 1);
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173 #ifdef HAVE_LD_STATIC_DYNAMIC
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174 if (force_static)
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175 append_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1);
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176 #endif
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177 }
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178
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179 void
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180 lang_specific_driver (struct cl_decoded_option **in_decoded_options,
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181 unsigned int *in_decoded_options_count,
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182 int *in_added_libraries ATTRIBUTE_UNUSED)
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183 {
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184 unsigned int argc = *in_decoded_options_count;
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185 struct cl_decoded_option *decoded_options = *in_decoded_options;
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186 unsigned int i;
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187 int verbose = 0;
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188
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189 /* 0 => -xnone in effect.
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190 1 => -xfoo in effect. */
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191 int saw_speclang = 0;
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192
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193 /* 0 => initial/reset state
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194 1 => last arg was -l<library>
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195 2 => last two args were -l<library> -lm. */
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196 int saw_library = 0;
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197
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198 /* By default, we throw on the math library if we have one. */
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199 int need_math = (MATH_LIBRARY[0] != '\0');
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200
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201 /* Whether we should link a static libgfortran. */
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202 int static_lib = 0;
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203
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204 /* Whether we need to link statically. */
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205 int static_linking = 0;
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206
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207 /* The number of input and output files in the incoming arg list. */
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208 int n_infiles = 0;
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209 int n_outfiles = 0;
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210
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211 library = FORTRAN_LIBRARY;
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212
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213 #if 0
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214 fprintf (stderr, "Incoming:");
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215 for (i = 0; i < argc; i++)
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216 fprintf (stderr, " %s", decoded_options[i].orig_option_with_args_text);
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217 fprintf (stderr, "\n");
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218 #endif
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219
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220 g77_xargc = argc;
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221 g77_x_decoded_options = decoded_options;
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222 g77_newargc = 0;
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223 g77_new_decoded_options = decoded_options;
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224
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225 /* First pass through arglist.
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226
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227 If -nostdlib or a "turn-off-linking" option is anywhere in the
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228 command line, don't do any library-option processing (except
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229 relating to -x). */
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230
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231 for (i = 1; i < argc; ++i)
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232 {
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233 if (decoded_options[i].errors & CL_ERR_MISSING_ARG)
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234 continue;
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235
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236 switch (decoded_options[i].opt_index)
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237 {
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238 case OPT_SPECIAL_input_file:
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239 ++n_infiles;
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240 continue;
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241
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242 case OPT_nostdlib:
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243 case OPT_nodefaultlibs:
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244 case OPT_c:
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245 case OPT_S:
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246 case OPT_fsyntax_only:
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247 case OPT_E:
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248 /* These options disable linking entirely or linking of the
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249 standard libraries. */
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250 library = 0;
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251 break;
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252
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253 case OPT_static_libgfortran:
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254 #ifdef HAVE_LD_STATIC_DYNAMIC
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255 static_lib = 1;
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256 #endif
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257 break;
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258
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259 case OPT_static:
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260 #ifdef HAVE_LD_STATIC_DYNAMIC
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261 static_linking = 1;
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262 #endif
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263 break;
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264
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265 case OPT_l:
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266 ++n_infiles;
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267 break;
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268
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269 case OPT_o:
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270 ++n_outfiles;
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271 break;
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272
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273 case OPT_v:
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274 verbose = 1;
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275 break;
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276
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277 case OPT__version:
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278 printf ("GNU Fortran %s%s\n", pkgversion_string, version_string);
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279 printf ("Copyright %s 2017 Free Software Foundation, Inc.\n",
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280 _("(C)"));
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281 fputs (_("This is free software; see the source for copying conditions. There is NO\n\
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282 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n"),
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283 stdout);
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284 exit (0);
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285 break;
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286
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287 case OPT__help:
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288 /* Let gcc.c handle this, as it has a really
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289 cool facility for handling --help and --verbose --help. */
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290 return;
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291
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292 default:
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293 break;
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294 }
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295 }
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296
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297 if ((n_outfiles != 0) && (n_infiles == 0))
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298 fatal_error (input_location,
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299 "no input files; unwilling to write output files");
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300
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301 /* If there are no input files, no need for the library. */
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302 if (n_infiles == 0)
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303 library = 0;
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304
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305 /* Second pass through arglist, transforming arguments as appropriate. */
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306
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307 append_arg (&decoded_options[0]); /* Start with command name, of course. */
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308
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309 for (i = 1; i < argc; ++i)
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310 {
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311 if (decoded_options[i].errors & CL_ERR_MISSING_ARG)
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312 {
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313 append_arg (&decoded_options[i]);
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314 continue;
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315 }
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316
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317 if (decoded_options[i].opt_index == OPT_SPECIAL_input_file
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318 && decoded_options[i].arg[0] == '\0')
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319 {
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320 /* Interesting. Just append as is. */
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321 append_arg (&decoded_options[i]);
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322 continue;
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323 }
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324
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325 if (decoded_options[i].opt_index != OPT_l
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326 && (decoded_options[i].opt_index != OPT_SPECIAL_input_file
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327 || strcmp (decoded_options[i].arg, "-") == 0))
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328 {
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329 /* Not a filename or library. */
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330
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331 if (saw_library == 1 && need_math) /* -l<library>. */
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332 append_option (OPT_l, MATH_LIBRARY, 1);
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333
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334 saw_library = 0;
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335
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336 if (decoded_options[i].opt_index == OPT_SPECIAL_input_file)
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337 {
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338 append_arg (&decoded_options[i]); /* "-" == Standard input. */
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339 continue;
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340 }
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341
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342 if (decoded_options[i].opt_index == OPT_x)
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343 {
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344 /* Track input language. */
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345 const char *lang = decoded_options[i].arg;
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346
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347 saw_speclang = (strcmp (lang, "none") != 0);
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348 }
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349
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350 append_arg (&decoded_options[i]);
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351
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352 continue;
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353 }
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354
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355 /* A filename/library, not an option. */
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356
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357 if (saw_speclang)
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358 saw_library = 0; /* -xfoo currently active. */
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359 else
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360 { /* -lfoo or filename. */
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361 if (decoded_options[i].opt_index == OPT_l
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362 && strcmp (decoded_options[i].arg, MATH_LIBRARY) == 0)
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363 {
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364 if (saw_library == 1)
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365 saw_library = 2; /* -l<library> -lm. */
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366 else
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367 add_arg_libgfortran (static_lib && !static_linking);
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368 }
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369 else if (decoded_options[i].opt_index == OPT_l
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370 && strcmp (decoded_options[i].arg, FORTRAN_LIBRARY) == 0)
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371 {
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372 saw_library = 1; /* -l<library>. */
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373 add_arg_libgfortran (static_lib && !static_linking);
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374 continue;
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375 }
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376 else
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377 { /* Other library, or filename. */
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378 if (saw_library == 1 && need_math)
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379 append_option (OPT_l, MATH_LIBRARY, 1);
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380 saw_library = 0;
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381 }
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382 }
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383 append_arg (&decoded_options[i]);
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384 }
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385
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386 /* Append `-lgfortran -lm' as necessary. */
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387
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388 if (library)
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389 { /* Doing a link and no -nostdlib. */
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390 if (saw_speclang)
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391 append_option (OPT_x, "none", 1);
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392
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393 switch (saw_library)
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394 {
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395 case 0:
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396 add_arg_libgfortran (static_lib && !static_linking);
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397 /* Fall through. */
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398
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399 case 1:
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400 if (need_math)
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401 append_option (OPT_l, MATH_LIBRARY, 1);
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402 default:
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403 break;
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404 }
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405 }
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406
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407 #ifdef ENABLE_SHARED_LIBGCC
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408 if (library)
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409 {
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410 unsigned int i;
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411
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412 for (i = 1; i < g77_newargc; i++)
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413 if (g77_new_decoded_options[i].opt_index == OPT_static_libgcc
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414 || g77_new_decoded_options[i].opt_index == OPT_static)
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415 break;
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416
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417 if (i == g77_newargc)
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418 append_option (OPT_shared_libgcc, NULL, 1);
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419 }
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420
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421 #endif
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422
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423 if (verbose && g77_new_decoded_options != g77_x_decoded_options)
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424 {
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425 fprintf (stderr, _("Driving:"));
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426 for (i = 0; i < g77_newargc; i++)
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427 fprintf (stderr, " %s",
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428 g77_new_decoded_options[i].orig_option_with_args_text);
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429 fprintf (stderr, "\n");
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430 }
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431
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|
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432 *in_decoded_options_count = g77_newargc;
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433 *in_decoded_options = g77_new_decoded_options;
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434 }
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435
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436
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437 /* Called before linking. Returns 0 on success and -1 on failure. */
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438 int
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439 lang_specific_pre_link (void)
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440 {
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|
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441 if (library)
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442 do_spec ("%:include(libgfortran.spec)");
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443
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444 return 0;
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445 }
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446
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447 /* Number of extra output files that lang_specific_pre_link may generate. */
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|
448 int lang_specific_extra_outfiles = 0; /* Not used for F77. */
|
