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111
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1 /* gospec.c -- Specific flags and argument handling of the gcc Go front end.
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145
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2 Copyright (C) 2009-2020 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 it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 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 `-lpthread'. */
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31 #define THREADLIB (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 #define THREAD_LIBRARY "pthread"
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45 #define THREAD_LIBRARY_PROFILE THREAD_LIBRARY
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46
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47 #define LIBGO "go"
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48 #define LIBGO_PROFILE LIBGO
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49 #define LIBGOBEGIN "gobegin"
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50
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51 void
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52 lang_specific_driver (struct cl_decoded_option **in_decoded_options,
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53 unsigned int *in_decoded_options_count,
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54 int *in_added_libraries)
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55 {
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56 unsigned int i, j;
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57
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58 /* If true, the user gave us the `-p' or `-pg' flag. */
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59 bool saw_profile_flag = false;
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60
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61 /* This is a tristate:
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62 -1 means we should not link in libgo
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63 0 means we should link in libgo if it is needed
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64 1 means libgo is needed and should be linked in.
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65 2 means libgo is needed and should be linked statically. */
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66 int library = 0;
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67
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68 /* The new argument list will be contained in this. */
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69 struct cl_decoded_option *new_decoded_options;
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70
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71 /* "-lm" or "-lmath" if it appears on the command line. */
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72 const struct cl_decoded_option *saw_math = 0;
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73
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74 /* "-lpthread" if it appears on the command line. */
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75 const struct cl_decoded_option *saw_thread = 0;
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76
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77 /* "-lc" if it appears on the command line. */
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78 const struct cl_decoded_option *saw_libc = 0;
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79
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80 /* An array used to flag each argument that needs a bit set for
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81 LANGSPEC, MATHLIB, or WITHLIBC. */
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82 int *args;
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83
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84 /* Whether we need the thread library. */
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85 int need_thread = 0;
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86
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87 /* By default, we throw on the math library if we have one. */
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88 int need_math = (MATH_LIBRARY[0] != '\0');
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89
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90 /* True if we saw -static. */
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91 int static_link = 0;
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92
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93 /* True if we should add -shared-libgcc to the command-line. */
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94 int shared_libgcc = 1;
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95
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96 /* The total number of arguments with the new stuff. */
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97 unsigned int argc;
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98
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99 /* The argument list. */
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100 struct cl_decoded_option *decoded_options;
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101
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102 /* The number of libraries added in. */
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103 int added_libraries;
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104
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105 /* The total number of arguments with the new stuff. */
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106 int num_args = 1;
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107
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108 /* Supports split stack */
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109 int supports_split_stack = 0;
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110
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111 /* Whether the -o option was used. */
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112 bool saw_opt_o = false;
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113
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114 /* Whether the -c option was used. Also used for -E, -fsyntax-only,
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115 in general anything which implies only compilation and not
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116 linking. */
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117 bool saw_opt_c = false;
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118
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119 /* Whether the -S option was used. */
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120 bool saw_opt_S = false;
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121
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122 #ifdef TARGET_CAN_SPLIT_STACK_64BIT
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123 /* Whether the -m64 option is in force. */
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124 bool is_m64 = TARGET_CAN_SPLIT_STACK_64BIT;
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125 #endif
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126
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127 /* The first input file with an extension of .go. */
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128 const char *first_go_file = NULL;
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129
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130 argc = *in_decoded_options_count;
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131 decoded_options = *in_decoded_options;
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132 added_libraries = *in_added_libraries;
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133
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134 args = XCNEWVEC (int, argc);
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135
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136 for (i = 1; i < argc; i++)
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137 {
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138 const char *arg = decoded_options[i].arg;
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139
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140 switch (decoded_options[i].opt_index)
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141 {
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131
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142 case OPT_r:
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111
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143 case OPT_nostdlib:
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144 case OPT_nodefaultlibs:
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145 library = -1;
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146 break;
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147
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148 case OPT_l:
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149 if (strcmp (arg, MATH_LIBRARY) == 0)
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150 {
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151 args[i] |= MATHLIB;
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152 need_math = 0;
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153 }
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154 else if (strcmp (arg, THREAD_LIBRARY) == 0)
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155 args[i] |= THREADLIB;
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156 else if (strcmp (arg, "c") == 0)
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157 args[i] |= WITHLIBC;
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158 else
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159 /* Unrecognized libraries (e.g. -lfoo) may require libgo. */
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160 library = (library == 0) ? 1 : library;
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161 break;
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162
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163 #ifdef TARGET_CAN_SPLIT_STACK_64BIT
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164 case OPT_m32:
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165 is_m64 = false;
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166 break;
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167
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168 case OPT_m64:
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169 is_m64 = true;
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170 break;
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171 #endif
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172
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173 case OPT_pg:
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174 case OPT_p:
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175 saw_profile_flag = true;
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176 break;
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177
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178 case OPT_x:
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179 if (library == 0 && strcmp (arg, "go") == 0)
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180 library = 1;
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181 break;
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182
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183 case OPT_Xlinker:
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184 case OPT_Wl_:
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185 /* Arguments that go directly to the linker might be .o files,
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186 or something, and so might cause libgo to be needed. */
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187 if (library == 0)
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188 library = 1;
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189 break;
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190
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191 case OPT_c:
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192 case OPT_E:
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193 case OPT_M:
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194 case OPT_MM:
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195 case OPT_fsyntax_only:
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196 /* Don't specify libraries if we won't link, since that would
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197 cause a warning. */
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198 saw_opt_c = true;
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199 library = -1;
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200 break;
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201
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202 case OPT_S:
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203 saw_opt_S = true;
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204 library = -1;
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205 break;
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206
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207 case OPT_o:
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208 saw_opt_o = true;
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209 break;
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210
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211 case OPT_static:
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212 static_link = 1;
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213 break;
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214
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215 case OPT_static_libgcc:
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216 shared_libgcc = 0;
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217 break;
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218
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219 case OPT_static_libgo:
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220 library = library >= 0 ? 2 : library;
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221 args[i] |= SKIPOPT;
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222 break;
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223
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224 case OPT_SPECIAL_input_file:
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225 if (library == 0)
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226 library = 1;
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227
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228 if (first_go_file == NULL)
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229 {
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230 int len;
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231
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232 len = strlen (arg);
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233 if (len > 3 && strcmp (arg + len - 3, ".go") == 0)
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234 first_go_file = arg;
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235 }
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236
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237 break;
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238 }
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239 }
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240
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241 /* There's no point adding -shared-libgcc if we don't have a shared
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242 libgcc. */
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243 #ifndef ENABLE_SHARED_LIBGCC
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244 shared_libgcc = 0;
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245 #endif
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246
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247 /* Make sure to have room for the trailing NULL argument. */
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248 num_args = argc + need_math + shared_libgcc + (library > 0) * 5 + 10;
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249 new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args);
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250
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251 i = 0;
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252 j = 0;
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253
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254 /* Copy the 0th argument, i.e., the name of the program itself. */
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255 new_decoded_options[j++] = decoded_options[i++];
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256
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257 #ifdef TARGET_CAN_SPLIT_STACK
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258 supports_split_stack = 1;
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259 #endif
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260
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261 #ifdef TARGET_CAN_SPLIT_STACK_64BIT
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262 if (is_m64)
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263 supports_split_stack = 1;
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264 #endif
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265
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266 /* If we are linking, pass -fsplit-stack if it is supported. */
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267 if ((library >= 0) && supports_split_stack)
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268 {
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269 generate_option (OPT_fsplit_stack, NULL, 1, CL_DRIVER,
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270 &new_decoded_options[j]);
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271 j++;
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272 }
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273
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274 /* NOTE: We start at 1 now, not 0. */
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275 while (i < argc)
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276 {
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277 new_decoded_options[j] = decoded_options[i];
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278
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279 /* Make sure -lgo is before the math library, since libgo itself
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280 uses those math routines. */
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281 if (!saw_math && (args[i] & MATHLIB) && library > 0)
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282 {
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283 --j;
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284 saw_math = &decoded_options[i];
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285 }
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286
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287 if (!saw_thread && (args[i] & THREADLIB) && library > 0)
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288 {
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289 --j;
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290 saw_thread = &decoded_options[i];
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291 }
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292
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293 if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
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294 {
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295 --j;
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296 saw_libc = &decoded_options[i];
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297 }
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298
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299 if ((args[i] & SKIPOPT) != 0)
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300 --j;
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301
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302 i++;
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303 j++;
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304 }
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305
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306 /* If we didn't see a -o option, add one. This is because we need
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307 the driver to pass all .go files to go1. Without a -o option the
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308 driver will invoke go1 separately for each input file. FIXME:
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309 This should probably use some other interface to force the driver
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310 to set combine_inputs. */
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311 if (first_go_file != NULL && !saw_opt_o)
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312 {
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313 if (saw_opt_c || saw_opt_S)
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314 {
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315 const char *base;
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316 int baselen;
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317 int alen;
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318 char *out;
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319
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320 base = lbasename (first_go_file);
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321 baselen = strlen (base) - 3;
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322 alen = baselen + 3;
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323 out = XNEWVEC (char, alen);
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324 memcpy (out, base, baselen);
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325 /* The driver will convert .o to some other suffix (e.g.,
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326 .obj) if appropriate. */
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327 out[baselen] = '.';
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328 if (saw_opt_S)
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329 out[baselen + 1] = 's';
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330 else
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331 out[baselen + 1] = 'o';
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332 out[baselen + 2] = '\0';
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333 generate_option (OPT_o, out, 1, CL_DRIVER,
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334 &new_decoded_options[j]);
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335 }
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336 else
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337 generate_option (OPT_o, "a.out", 1, CL_DRIVER,
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338 &new_decoded_options[j]);
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339 j++;
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340 }
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341
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342 /* Add `-lgo' if we haven't already done so. */
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343 if (library > 0)
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344 {
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345 generate_option (OPT_l, LIBGOBEGIN, 1, CL_DRIVER,
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346 &new_decoded_options[j]);
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347 added_libraries++;
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348 j++;
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349
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350 #ifdef HAVE_LD_STATIC_DYNAMIC
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351 if (library > 1 && !static_link)
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352 {
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353 generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER,
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354 &new_decoded_options[j]);
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355 j++;
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356 }
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357 #endif
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358
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359 generate_option (OPT_l, saw_profile_flag ? LIBGO_PROFILE : LIBGO, 1,
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360 CL_DRIVER, &new_decoded_options[j]);
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361 added_libraries++;
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362 j++;
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363
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364 #ifdef HAVE_LD_STATIC_DYNAMIC
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365 if (library > 1 && !static_link)
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366 {
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367 generate_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1, CL_DRIVER,
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368 &new_decoded_options[j]);
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369 j++;
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370 }
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371 #endif
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372
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373 /* When linking libgo statically we also need to link with the
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374 pthread library. */
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375 if (library > 1 || static_link)
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376 need_thread = 1;
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377 }
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378
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379 if (saw_thread)
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380 new_decoded_options[j++] = *saw_thread;
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381 else if (library > 0 && need_thread)
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382 {
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383 generate_option (OPT_l,
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384 (saw_profile_flag
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385 ? THREAD_LIBRARY_PROFILE
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386 : THREAD_LIBRARY),
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387 1, CL_DRIVER, &new_decoded_options[j]);
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388 added_libraries++;
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389 j++;
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390 }
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391
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392 if (saw_math)
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393 new_decoded_options[j++] = *saw_math;
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394 else if (library > 0 && need_math)
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395 {
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396 generate_option (OPT_l,
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397 saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY,
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398 1, CL_DRIVER, &new_decoded_options[j]);
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399 added_libraries++;
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400 j++;
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401 }
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402
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403 if (saw_libc)
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404 new_decoded_options[j++] = *saw_libc;
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405 if (shared_libgcc && !static_link)
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406 generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
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407 &new_decoded_options[j++]);
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408
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409 /* libgcc wraps pthread_create to support split stack, however, due to
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410 relative ordering of -lpthread and -lgcc, we can't just mark
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411 __real_pthread_create in libgcc as non-weak. But we need to link in
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412 pthread_create from pthread if we are statically linking, so we work-
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413 around by passing -u pthread_create to the linker. */
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414 if (static_link && supports_split_stack)
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415 {
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416 generate_option (OPT_Wl_, "-u,pthread_create", 1, CL_DRIVER,
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417 &new_decoded_options[j]);
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418 j++;
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419 }
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420
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421 #if defined(TARGET_SOLARIS) && !defined(USE_GLD)
|
|
|
422 /* We use a common symbol for go$zerovalue. On Solaris, when not
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423 using the GNU linker, the Solaris linker needs an option to not
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424 warn about this. Everything works without this option, but you
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425 get unsightly warnings at link time. */
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426 generate_option (OPT_Wl_, "-t", 1, CL_DRIVER, &new_decoded_options[j]);
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427 j++;
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428 #endif
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429
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430 *in_decoded_options_count = j;
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431 *in_decoded_options = new_decoded_options;
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432 *in_added_libraries = added_libraries;
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433 }
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434
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435 /* Called before linking. Returns 0 on success and -1 on failure. */
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436 int lang_specific_pre_link (void) /* Not used for Go. */
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437 {
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438 return 0;
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439 }
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440
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441 /* Number of extra output files that lang_specific_pre_link may generate. */
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442 int lang_specific_extra_outfiles = 0; /* Not used for Go. */
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