1 /* Base configuration file for all OpenBSD targets. 2 Copyright (C) 1999, 2000 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GCC is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING. If not, write to 18 the Free Software Foundation, 59 Temple Place - Suite 330, 19 Boston, MA 02111-1307, USA. */ 20 21 /* Common OpenBSD configuration. 22 All OpenBSD architectures include this file, which is intended as 23 a repository for common defines. 24 25 Some defines are common to all architectures, a few of them are 26 triggered by OBSD_* guards, so that we won't override architecture 27 defaults by mistakes. 28 29 OBSD_HAS_CORRECT_SPECS: 30 another mechanism provides correct specs already. 31 OBSD_NO_DYNAMIC_LIBRARIES: 32 no implementation of dynamic libraries. 33 OBSD_OLD_GAS: 34 older flavor of gas which needs help for PIC. 35 OBSD_HAS_DECLARE_FUNCTION_NAME, OBSD_HAS_DECLARE_FUNCTION_SIZE, 36 OBSD_HAS_DECLARE_OBJECT: 37 PIC support, FUNCTION_NAME/FUNCTION_SIZE are independent, whereas 38 the corresponding logic for OBJECTS is necessarily coupled. 39 40 There are also a few `default' defines such as ASM_WEAKEN_LABEL, 41 intended as common ground for arch that don't provide 42 anything suitable. */ 43 44 /* OPENBSD_NATIVE is defined only when gcc is configured as part of 45 the OpenBSD source tree, specifically through Makefile.bsd-wrapper. 46 47 In such a case the include path can be trimmed as there is no 48 distinction between system includes and gcc includes. */ 49 50 /* This configuration method, namely Makefile.bsd-wrapper and 51 OPENBSD_NATIVE is NOT recommended for building cross-compilers. */ 52 53 #ifdef OPENBSD_NATIVE 54 55 #undef GCC_INCLUDE_DIR 56 #define GCC_INCLUDE_DIR "/usr/include" 57 58 /* The compiler is configured with ONLY the gcc/g++ standard headers. */ 59 #undef INCLUDE_DEFAULTS 60 #define INCLUDE_DEFAULTS \ 61 { \ 62 { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 }, \ 63 { GCC_INCLUDE_DIR, "GCC", 0, 0 }, \ 64 { 0, 0, 0, 0 } \ 65 } 66 67 /* Under OpenBSD, the normal location of the various *crt*.o files is the 68 /usr/lib directory. */ 69 #define STANDARD_STARTFILE_PREFIX "/usr/lib/" 70 71 #endif 72 73 74 /* Controlling the compilation driver. */ 75 76 /* CPP_SPEC appropriate for OpenBSD. We deal with -posix and -pthread. 77 XXX the way threads are handling currently is not very satisfying, 78 since all code must be compiled with -pthread to work. 79 This two-stage defines makes it easy to pick that for targets that 80 have subspecs. */ 81 #ifdef CPP_CPU_SPEC 82 #define OBSD_CPP_SPEC "%(cpp_cpu) %{posix:-D_POSIX_SOURCE} %{pthread:-D_POSIX_THREADS}" 83 #else 84 #define OBSD_CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_POSIX_THREADS}" 85 #endif 86 87 /* LIB_SPEC appropriate for OpenBSD. Select the appropriate libc, 88 depending on profiling and threads. Basically, 89 -lc(_r)?(_p)?, select _r for threads, and _p for p or pg. */ 90 #define OBSD_LIB_SPEC "%{!shared:-lc%{pthread:_r}%{p:_p}%{!p:%{pg:_p}}}" 91 92 #ifndef OBSD_HAS_CORRECT_SPECS 93 94 #ifndef OBSD_NO_DYNAMIC_LIBRARIES 95 #undef SWITCH_TAKES_ARG 96 #define SWITCH_TAKES_ARG(CHAR) \ 97 (DEFAULT_SWITCH_TAKES_ARG (CHAR) \ 98 || (CHAR) == 'R') 99 #endif 100 101 #undef CPP_SPEC 102 #define CPP_SPEC OBSD_CPP_SPEC 103 104 #ifdef OBSD_OLD_GAS 105 /* ASM_SPEC appropriate for OpenBSD. For some architectures, OpenBSD 106 still uses a special flavor of gas that needs to be told when generating 107 pic code. */ 108 #undef ASM_SPEC 109 #define ASM_SPEC "%{fpic|fpie:-k} %{fPIC|fPIE:-k -K}" 110 #endif 111 112 /* Since we use gas, stdin -> - is a good idea. */ 113 #define AS_NEEDS_DASH_FOR_PIPED_INPUT 114 115 /* LINK_SPEC appropriate for OpenBSD. Support for GCC options 116 -static, -assert, and -nostdlib. */ 117 #undef LINK_SPEC 118 #ifdef OBSD_NO_DYNAMIC_LIBRARIES 119 #define LINK_SPEC \ 120 "%{g:%{!nostdlib:-L/usr/lib/debug}} %{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{assert*}" 121 #else 122 #define LINK_SPEC \ 123 "%{g:%{!nostdlib:-L/usr/lib/debug}} %{!shared:%{!nostdlib:%{!r*:%{!e*:-e start}}}} %{shared:-Bshareable -x} -dc -dp %{R*} %{static:-Bstatic} %{assert*}" 124 #endif 125 126 #undef LIB_SPEC 127 #define LIB_SPEC OBSD_LIB_SPEC 128 #endif 129 130 131 /* Runtime target specification. */ 132 133 /* Implicit calls to library routines. */ 134 135 /* Use memcpy and memset instead of bcopy and bzero. */ 136 #ifndef TARGET_MEM_FUNCTIONS 137 #define TARGET_MEM_FUNCTIONS 138 #endif 139 140 /* Miscellaneous parameters. */ 141 142 /* Controlling debugging info: dbx options. */ 143 144 /* Don't use the `xsTAG;' construct in DBX output; OpenBSD systems that 145 use DBX don't support it. */ 146 #define DBX_NO_XREFS 147 148 149 /* Support of shared libraries, mostly imported from svr4.h through netbsd. */ 150 /* Two differences from svr4.h: 151 - we use . - _func instead of a local label, 152 - we put extra spaces in expressions such as 153 .type _func , @function 154 This is more readable for a human being and confuses c++filt less. */ 155 156 /* Assembler format: output and generation of labels. */ 157 158 /* Define the strings used for the .type and .size directives. 159 These strings generally do not vary from one system running OpenBSD 160 to another, but if a given system needs to use different pseudo-op 161 names for these, they may be overridden in the arch specific file. */ 162 163 /* OpenBSD assembler is hacked to have .type & .size support even in a.out 164 format object files. Functions size are supported but not activated 165 yet (look for GRACE_PERIOD_EXPIRED in gas/config/obj-aout.c). 166 SET_ASM_OP is needed for attribute alias to work. */ 167 168 #undef TYPE_ASM_OP 169 #undef SIZE_ASM_OP 170 #undef SET_ASM_OP 171 #undef GLOBAL_ASM_OP 172 173 #define TYPE_ASM_OP "\t.type\t" 174 #define SIZE_ASM_OP "\t.size\t" 175 #define SET_ASM_OP "\t.set\t" 176 #define GLOBAL_ASM_OP "\t.globl\t" 177 178 /* The following macro defines the format used to output the second 179 operand of the .type assembler directive. */ 180 #undef TYPE_OPERAND_FMT 181 #define TYPE_OPERAND_FMT "@%s" 182 183 /* Provision if extra assembler code is needed to declare a function's result 184 (taken from svr4, not needed yet actually). */ 185 #ifndef ASM_DECLARE_RESULT 186 #define ASM_DECLARE_RESULT(FILE, RESULT) 187 #endif 188 189 /* These macros generate the special .type and .size directives which 190 are used to set the corresponding fields of the linker symbol table 191 entries under OpenBSD. These macros also have to output the starting 192 labels for the relevant functions/objects. */ 193 194 #ifndef OBSD_HAS_DECLARE_FUNCTION_NAME 195 /* Extra assembler code needed to declare a function properly. 196 Some assemblers may also need to also have something extra said 197 about the function's return value. We allow for that here. */ 198 #undef ASM_DECLARE_FUNCTION_NAME 199 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ 200 do { \ 201 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \ 202 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \ 203 ASM_OUTPUT_LABEL(FILE, NAME); \ 204 } while (0) 205 #endif 206 207 #ifndef OBSD_HAS_DECLARE_FUNCTION_SIZE 208 /* Declare the size of a function. */ 209 #undef ASM_DECLARE_FUNCTION_SIZE 210 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \ 211 do { \ 212 if (!flag_inhibit_size_directive) \ 213 ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME); \ 214 } while (0) 215 #endif 216 217 #ifndef OBSD_HAS_DECLARE_OBJECT 218 /* Extra assembler code needed to declare an object properly. */ 219 #undef ASM_DECLARE_OBJECT_NAME 220 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ 221 do { \ 222 HOST_WIDE_INT size; \ 223 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ 224 size_directive_output = 0; \ 225 if (!flag_inhibit_size_directive \ 226 && (DECL) && DECL_SIZE (DECL)) \ 227 { \ 228 size_directive_output = 1; \ 229 size = int_size_in_bytes (TREE_TYPE (DECL)); \ 230 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \ 231 } \ 232 ASM_OUTPUT_LABEL (FILE, NAME); \ 233 } while (0) 234 235 /* Output the size directive for a decl in rest_of_decl_compilation 236 in the case where we did not do so before the initializer. 237 Once we find the error_mark_node, we know that the value of 238 size_directive_output was set by ASM_DECLARE_OBJECT_NAME 239 when it was run for the same decl. */ 240 #undef ASM_FINISH_DECLARE_OBJECT 241 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \ 242 do { \ 243 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \ 244 HOST_WIDE_INT size; \ 245 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \ 246 && ! AT_END && TOP_LEVEL \ 247 && DECL_INITIAL (DECL) == error_mark_node \ 248 && !size_directive_output) \ 249 { \ 250 size_directive_output = 1; \ 251 size = int_size_in_bytes (TREE_TYPE (DECL)); \ 252 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \ 253 } \ 254 } while (0) 255 #endif 256 257 258 /* Those are `generic' ways to weaken/globalize a label. We shouldn't need 259 to override a processor specific definition. Hence, #ifndef ASM_* 260 In case overriding turns out to be needed, one can always #undef ASM_* 261 before including this file. */ 262 263 /* Tell the assembler that a symbol is weak. */ 264 /* Note: netbsd arm32 assembler needs a .globl here. An override may 265 be needed when/if we go for arm32 support. */ 266 #ifndef ASM_WEAKEN_LABEL 267 #define ASM_WEAKEN_LABEL(FILE,NAME) \ 268 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \ 269 fputc ('\n', FILE); } while (0) 270 #endif 271 272 /* Storage layout. */ 273 274 275 /* Otherwise, since we support weak, gthr.h erroneously tries to use 276 #pragma weak. */ 277 #define GTHREAD_USE_WEAK 0 278 279 /* bug work around: we don't want to support #pragma weak, but the current 280 code layout needs HANDLE_PRAGMA_WEAK asserted for __attribute((weak)) to 281 work. On the other hand, we don't define HANDLE_PRAGMA_WEAK directly, 282 as this depends on a few other details as well... */ 283 #define HANDLE_SYSV_PRAGMA 1 284 285