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111
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1 /* Specific flags and argument handling of the C++ front end.
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131
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2 Copyright (C) 1996-2018 Free Software Foundation, Inc.
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111
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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 GCC 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 GCC 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 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include "tm.h"
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24 #include "opts.h"
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25
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26 /* This bit is set if we saw a `-xfoo' language specification. */
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27 #define LANGSPEC (1<<1)
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28 /* This bit is set if they did `-lm' or `-lmath'. */
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29 #define MATHLIB (1<<2)
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30 /* This bit is set if they did `-lrt' or equivalent. */
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31 #define TIMELIB (1<<3)
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32 /* This bit is set if they did `-lc'. */
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33 #define WITHLIBC (1<<4)
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34 /* Skip this option. */
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35 #define SKIPOPT (1<<5)
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36
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37 #ifndef MATH_LIBRARY
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38 #define MATH_LIBRARY "m"
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39 #endif
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40 #ifndef MATH_LIBRARY_PROFILE
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41 #define MATH_LIBRARY_PROFILE MATH_LIBRARY
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42 #endif
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43
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44 #ifndef TIME_LIBRARY
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45 #define TIME_LIBRARY ""
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46 #endif
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47
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48 #ifndef LIBSTDCXX
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49 #define LIBSTDCXX "stdc++"
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50 #endif
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51 #ifndef LIBSTDCXX_PROFILE
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52 #define LIBSTDCXX_PROFILE LIBSTDCXX
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53 #endif
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54 #ifndef LIBSTDCXX_STATIC
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55 #define LIBSTDCXX_STATIC NULL
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56 #endif
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57
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58 void
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59 lang_specific_driver (struct cl_decoded_option **in_decoded_options,
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60 unsigned int *in_decoded_options_count,
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61 int *in_added_libraries)
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62 {
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63 unsigned int i, j;
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64
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65 /* If nonzero, the user gave us the `-p' or `-pg' flag. */
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66 int saw_profile_flag = 0;
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67
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68 /* What do with libstdc++:
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69 -1 means we should not link in libstdc++
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70 0 means we should link in libstdc++ if it is needed
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71 1 means libstdc++ is needed and should be linked in.
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72 2 means libstdc++ is needed and should be linked statically. */
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73 int library = 0;
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74
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75 /* The number of arguments being added to what's in argv, other than
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76 libraries. We use this to track the number of times we've inserted
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77 -xc++/-xnone. */
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78 int added = 0;
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79
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80 /* The new argument list will be contained in this. */
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81 struct cl_decoded_option *new_decoded_options;
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82
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83 /* Nonzero if we saw a `-xfoo' language specification on the
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84 command line. Used to avoid adding our own -xc++ if the user
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85 already gave a language for the file. */
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86 int saw_speclang = 0;
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87
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88 /* "-lm" or "-lmath" if it appears on the command line. */
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89 const struct cl_decoded_option *saw_math = NULL;
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90
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91 /* "-lrt" or eqivalent if it appears on the command line. */
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92 const struct cl_decoded_option *saw_time = NULL;
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93
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94 /* "-lc" if it appears on the command line. */
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95 const struct cl_decoded_option *saw_libc = NULL;
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96
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97 /* An array used to flag each argument that needs a bit set for
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98 LANGSPEC, MATHLIB, TIMELIB, or WITHLIBC. */
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99 int *args;
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100
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101 /* By default, we throw on the math library if we have one. */
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102 int need_math = (MATH_LIBRARY[0] != '\0');
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103
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104 /* By default, we throw on the time library if we have one. */
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105 int need_time = (TIME_LIBRARY[0] != '\0');
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106
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107 /* True if we saw -static. */
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108 int static_link = 0;
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109
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110 /* True if we should add -shared-libgcc to the command-line. */
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111 int shared_libgcc = 1;
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112
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113 /* The total number of arguments with the new stuff. */
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114 unsigned int argc;
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115
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116 /* The argument list. */
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117 struct cl_decoded_option *decoded_options;
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118
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119 /* The number of libraries added in. */
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120 int added_libraries;
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121
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122 /* The total number of arguments with the new stuff. */
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123 unsigned int num_args = 1;
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124
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125 argc = *in_decoded_options_count;
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126 decoded_options = *in_decoded_options;
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127 added_libraries = *in_added_libraries;
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128
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129 args = XCNEWVEC (int, argc);
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130
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131 for (i = 1; i < argc; i++)
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132 {
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133 const char *arg = decoded_options[i].arg;
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134 if (decoded_options[i].errors & CL_ERR_MISSING_ARG)
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135 continue; /* Avoid examining arguments of options missing them. */
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136
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137 switch (decoded_options[i].opt_index)
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138 {
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139 case OPT_nostdlib:
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140 case OPT_nodefaultlibs:
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141 library = -1;
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142 break;
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143
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144 case OPT_l:
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145 if (strcmp (arg, MATH_LIBRARY) == 0)
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146 {
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147 args[i] |= MATHLIB;
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148 need_math = 0;
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149 }
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150 else if (strcmp (arg, TIME_LIBRARY) == 0)
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151 {
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152 args[i] |= TIMELIB;
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153 need_time = 0;
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154 }
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155 else if (strcmp (arg, "c") == 0)
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156 args[i] |= WITHLIBC;
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157 else
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158 /* Unrecognized libraries (e.g. -lfoo) may require libstdc++. */
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159 library = (library == 0) ? 1 : library;
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160 break;
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161
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162 case OPT_pg:
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163 case OPT_p:
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164 saw_profile_flag++;
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165 break;
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166
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167 case OPT_x:
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168 if (library == 0
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169 && (strcmp (arg, "c++") == 0
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170 || strcmp (arg, "c++-cpp-output") == 0
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171 || strcmp (arg, "objective-c++") == 0
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172 || strcmp (arg, "objective-c++-cpp-output") == 0))
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173 library = 1;
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174
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175 saw_speclang = 1;
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176 break;
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177
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178 case OPT_Xlinker:
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179 case OPT_Wl_:
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180 /* Arguments that go directly to the linker might be .o files,
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181 or something, and so might cause libstdc++ to be needed. */
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182 if (library == 0)
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183 library = 1;
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184 break;
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185
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186 case OPT_c:
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131
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187 case OPT_r:
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111
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188 case OPT_S:
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189 case OPT_E:
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190 case OPT_M:
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191 case OPT_MM:
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192 case OPT_fsyntax_only:
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193 /* Don't specify libraries if we won't link, since that would
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194 cause a warning. */
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195 library = -1;
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196 break;
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197
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198 case OPT_static:
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199 static_link = 1;
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200 break;
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201
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202 case OPT_static_libgcc:
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203 shared_libgcc = 0;
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204 break;
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205
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206 case OPT_static_libstdc__:
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207 library = library >= 0 ? 2 : library;
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208 args[i] |= SKIPOPT;
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209 break;
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210
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211 case OPT_SPECIAL_input_file:
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212 {
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213 int len;
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214
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215 /* We don't do this anymore, since we don't get them with minus
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216 signs on them. */
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217 if (arg[0] == '\0' || arg[1] == '\0')
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218 continue;
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219
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220 if (saw_speclang)
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221 {
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222 saw_speclang = 0;
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223 continue;
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224 }
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225
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226 /* If the filename ends in .[chi], put options around it.
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227 But not if a specified -x option is currently active. */
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228 len = strlen (arg);
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229 if (len > 2
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230 && (arg[len - 1] == 'c'
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231 || arg[len - 1] == 'i'
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232 || arg[len - 1] == 'h')
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233 && arg[len - 2] == '.')
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234 {
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235 args[i] |= LANGSPEC;
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236 added += 2;
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237 }
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238
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239 /* If we don't know that this is a header file, we might
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240 need to be linking in the libraries. */
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241 if (library == 0)
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242 {
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243 if ((len <= 2 || strcmp (arg + (len - 2), ".H") != 0)
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244 && (len <= 2 || strcmp (arg + (len - 2), ".h") != 0)
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245 && (len <= 4 || strcmp (arg + (len - 4), ".hpp") != 0)
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246 && (len <= 3 || strcmp (arg + (len - 3), ".hp") != 0)
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247 && (len <= 4 || strcmp (arg + (len - 4), ".hxx") != 0)
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248 && (len <= 4 || strcmp (arg + (len - 4), ".h++") != 0)
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249 && (len <= 4 || strcmp (arg + (len - 4), ".HPP") != 0)
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250 && (len <= 4 || strcmp (arg + (len - 4), ".tcc") != 0)
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251 && (len <= 3 || strcmp (arg + (len - 3), ".hh") != 0))
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252 library = 1;
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253 }
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254 }
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255 break;
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256 }
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257 }
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258
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259 /* There's no point adding -shared-libgcc if we don't have a shared
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260 libgcc. */
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261 #ifndef ENABLE_SHARED_LIBGCC
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262 shared_libgcc = 0;
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263 #endif
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264
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265 /* Add one for shared_libgcc or extra static library. */
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266 num_args = argc + added + need_math + (library > 0) * 4 + 1;
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267 new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args);
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268
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269 i = 0;
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270 j = 0;
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271
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272 /* Copy the 0th argument, i.e., the name of the program itself. */
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273 new_decoded_options[j++] = decoded_options[i++];
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274
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275 /* NOTE: We start at 1 now, not 0. */
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276 while (i < argc)
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277 {
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278 new_decoded_options[j] = decoded_options[i];
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279
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280 /* Make sure -lstdc++ is before the math library, since libstdc++
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281 itself uses those math routines. */
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282 if (!saw_math && (args[i] & MATHLIB) && library > 0)
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283 {
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284 --j;
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285 saw_math = &decoded_options[i];
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286 }
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287
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288 if (!saw_time && (args[i] & TIMELIB) && library > 0)
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289 {
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290 --j;
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291 saw_time = &decoded_options[i];
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292 }
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293
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294 if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
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295 {
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296 --j;
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297 saw_libc = &decoded_options[i];
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298 }
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299
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300 /* Wrap foo.[chi] files in a language specification to
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301 force the gcc compiler driver to run cc1plus on them. */
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302 if (args[i] & LANGSPEC)
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303 {
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304 const char *arg = decoded_options[i].arg;
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305 int len = strlen (arg);
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306 switch (arg[len - 1])
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307 {
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308 case 'c':
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309 generate_option (OPT_x, "c++", 1, CL_DRIVER,
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310 &new_decoded_options[j++]);
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311 break;
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312 case 'i':
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313 generate_option (OPT_x, "c++-cpp-output", 1, CL_DRIVER,
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314 &new_decoded_options[j++]);
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315 break;
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316 case 'h':
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317 generate_option (OPT_x, "c++-header", 1, CL_DRIVER,
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318 &new_decoded_options[j++]);
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319 break;
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320 default:
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321 gcc_unreachable ();
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322 }
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323 new_decoded_options[j++] = decoded_options[i];
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324 generate_option (OPT_x, "none", 1, CL_DRIVER,
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325 &new_decoded_options[j]);
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326 }
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327
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328 if ((args[i] & SKIPOPT) != 0)
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329 --j;
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330
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331 i++;
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332 j++;
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333 }
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334
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335 /* Add `-lstdc++' if we haven't already done so. */
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336 if (library > 0)
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337 {
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338 #ifdef HAVE_LD_STATIC_DYNAMIC
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339 if (library > 1 && !static_link)
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340 {
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341 generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER,
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342 &new_decoded_options[j]);
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343 j++;
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344 }
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345 #endif
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346 generate_option (OPT_l,
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347 saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX, 1,
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348 CL_DRIVER, &new_decoded_options[j]);
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349 added_libraries++;
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350 j++;
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351 /* Add target-dependent static library, if necessary. */
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352 if ((static_link || library > 1) && LIBSTDCXX_STATIC != NULL)
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353 {
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354 generate_option (OPT_l, LIBSTDCXX_STATIC, 1,
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355 CL_DRIVER, &new_decoded_options[j]);
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356 added_libraries++;
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357 j++;
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358 }
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359 #ifdef HAVE_LD_STATIC_DYNAMIC
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360 if (library > 1 && !static_link)
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361 {
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362 generate_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1, CL_DRIVER,
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363 &new_decoded_options[j]);
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364 j++;
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365 }
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366 #endif
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367 }
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368 if (saw_math)
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369 new_decoded_options[j++] = *saw_math;
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370 else if (library > 0 && need_math)
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371 {
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372 generate_option (OPT_l,
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373 saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY,
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374 1, CL_DRIVER, &new_decoded_options[j]);
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375 added_libraries++;
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376 j++;
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377 }
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378 if (saw_time)
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379 new_decoded_options[j++] = *saw_time;
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380 else if (library > 0 && need_time)
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381 {
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382 generate_option (OPT_l, TIME_LIBRARY, 1, CL_DRIVER,
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383 &new_decoded_options[j]);
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384 added_libraries++;
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385 j++;
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386 }
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387 if (saw_libc)
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388 new_decoded_options[j++] = *saw_libc;
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389 if (shared_libgcc && !static_link)
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390 generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
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391 &new_decoded_options[j++]);
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392
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393 *in_decoded_options_count = j;
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394 *in_decoded_options = new_decoded_options;
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395 *in_added_libraries = added_libraries;
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396 }
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397
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398 /* Called before linking. Returns 0 on success and -1 on failure. */
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399 int lang_specific_pre_link (void) /* Not used for C++. */
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400 {
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401 return 0;
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402 }
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403
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404 /* Number of extra output files that lang_specific_pre_link may generate. */
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405 int lang_specific_extra_outfiles = 0; /* Not used for C++. */
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