1 /* Definitions for systems using the Linux kernel, with or without 2 MMU, using ELF at the compiler level but possibly FLT for final 3 linked executables and shared libraries in some no-MMU cases, and 4 possibly with a choice of libc implementations. 5 Copyright (C) 1995-2021 Free Software Foundation, Inc. 6 Contributed by Eric Youngdale. 7 Modified for stabs-in-ELF by H.J. Lu (hjl@lucon.org). 8 9 This file is part of GCC. 10 11 GCC is free software; you can redistribute it and/or modify 12 it under the terms of the GNU General Public License as published by 13 the Free Software Foundation; either version 3, or (at your option) 14 any later version. 15 16 GCC is distributed in the hope that it will be useful, 17 but WITHOUT ANY WARRANTY; without even the implied warranty of 18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 GNU General Public License for more details. 20 21 Under Section 7 of GPL version 3, you are granted additional 22 permissions described in the GCC Runtime Library Exception, version 23 3.1, as published by the Free Software Foundation. 24 25 You should have received a copy of the GNU General Public License and 26 a copy of the GCC Runtime Library Exception along with this program; 27 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 28 <http://www.gnu.org/licenses/>. */ 29 30 /* C libraries supported on Linux. */ 31 #ifdef SINGLE_LIBC 32 #define OPTION_GLIBC (DEFAULT_LIBC == LIBC_GLIBC) 33 #define OPTION_UCLIBC (DEFAULT_LIBC == LIBC_UCLIBC) 34 #define OPTION_BIONIC (DEFAULT_LIBC == LIBC_BIONIC) 35 #undef OPTION_MUSL 36 #define OPTION_MUSL (DEFAULT_LIBC == LIBC_MUSL) 37 #else 38 #define OPTION_GLIBC (linux_libc == LIBC_GLIBC) 39 #define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC) 40 #define OPTION_BIONIC (linux_libc == LIBC_BIONIC) 41 #undef OPTION_MUSL 42 #define OPTION_MUSL (linux_libc == LIBC_MUSL) 43 #endif 44 45 #define GNU_USER_TARGET_OS_CPP_BUILTINS() \ 46 do { \ 47 if (OPTION_GLIBC) \ 48 builtin_define ("__gnu_linux__"); \ 49 builtin_define_std ("linux"); \ 50 builtin_define_std ("unix"); \ 51 builtin_assert ("system=linux"); \ 52 builtin_assert ("system=unix"); \ 53 builtin_assert ("system=posix"); \ 54 } while (0) 55 56 #define GNU_USER_TARGET_D_OS_VERSIONS() \ 57 do { \ 58 builtin_version ("linux"); \ 59 if (OPTION_GLIBC) \ 60 builtin_version ("CRuntime_Glibc"); \ 61 else if (OPTION_UCLIBC) \ 62 builtin_version ("CRuntime_UClibc"); \ 63 else if (OPTION_BIONIC) \ 64 builtin_version ("CRuntime_Bionic"); \ 65 else if (OPTION_MUSL) \ 66 builtin_version ("CRuntime_Musl"); \ 67 } while (0) 68 69 /* Determine which dynamic linker to use depending on whether GLIBC or 70 uClibc or Bionic or musl is the default C library and whether 71 -muclibc or -mglibc or -mbionic or -mmusl has been passed to change 72 the default. */ 73 74 #define CHOOSE_DYNAMIC_LINKER1(LIBC1, LIBC2, LIBC3, LIBC4, LD1, LD2, LD3, LD4) \ 75 "%{" LIBC2 ":" LD2 ";:%{" LIBC3 ":" LD3 ";:%{" LIBC4 ":" LD4 ";:" LD1 "}}}" 76 77 #if DEFAULT_LIBC == LIBC_GLIBC 78 #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ 79 CHOOSE_DYNAMIC_LINKER1 ("mglibc", "muclibc", "mbionic", "mmusl", G, U, B, M) 80 #elif DEFAULT_LIBC == LIBC_UCLIBC 81 #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ 82 CHOOSE_DYNAMIC_LINKER1 ("muclibc", "mglibc", "mbionic", "mmusl", U, G, B, M) 83 #elif DEFAULT_LIBC == LIBC_BIONIC 84 #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ 85 CHOOSE_DYNAMIC_LINKER1 ("mbionic", "mglibc", "muclibc", "mmusl", B, G, U, M) 86 #elif DEFAULT_LIBC == LIBC_MUSL 87 #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ 88 CHOOSE_DYNAMIC_LINKER1 ("mmusl", "mglibc", "muclibc", "mbionic", M, G, U, B) 89 #else 90 #error "Unsupported DEFAULT_LIBC" 91 #endif /* DEFAULT_LIBC */ 92 93 /* For most targets the following definitions suffice; 94 GLIBC_DYNAMIC_LINKER must be defined for each target using them, or 95 GLIBC_DYNAMIC_LINKER32 and GLIBC_DYNAMIC_LINKER64 for targets 96 supporting both 32-bit and 64-bit compilation. */ 97 #define UCLIBC_DYNAMIC_LINKER "/lib/ld-uClibc.so.0" 98 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0" 99 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0" 100 #define UCLIBC_DYNAMIC_LINKERX32 "/lib/ldx32-uClibc.so.0" 101 #define BIONIC_DYNAMIC_LINKER "/system/bin/linker" 102 #define BIONIC_DYNAMIC_LINKER32 "/system/bin/linker" 103 #define BIONIC_DYNAMIC_LINKER64 "/system/bin/linker64" 104 #define BIONIC_DYNAMIC_LINKERX32 "/system/bin/linkerx32" 105 /* Should be redefined for each target that supports musl. */ 106 #define MUSL_DYNAMIC_LINKER "/dev/null" 107 #define MUSL_DYNAMIC_LINKER32 "/dev/null" 108 #define MUSL_DYNAMIC_LINKER64 "/dev/null" 109 #define MUSL_DYNAMIC_LINKERX32 "/dev/null" 110 111 #define GNU_USER_DYNAMIC_LINKER \ 112 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER, \ 113 BIONIC_DYNAMIC_LINKER, MUSL_DYNAMIC_LINKER) 114 #define GNU_USER_DYNAMIC_LINKER32 \ 115 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, \ 116 BIONIC_DYNAMIC_LINKER32, MUSL_DYNAMIC_LINKER32) 117 #define GNU_USER_DYNAMIC_LINKER64 \ 118 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, \ 119 BIONIC_DYNAMIC_LINKER64, MUSL_DYNAMIC_LINKER64) 120 #define GNU_USER_DYNAMIC_LINKERX32 \ 121 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKERX32, UCLIBC_DYNAMIC_LINKERX32, \ 122 BIONIC_DYNAMIC_LINKERX32, MUSL_DYNAMIC_LINKERX32) 123 124 /* Whether we have Bionic libc runtime */ 125 #undef TARGET_HAS_BIONIC 126 #define TARGET_HAS_BIONIC (OPTION_BIONIC) 127 128 /* musl avoids problematic includes by rearranging the include directories. 129 * Unfortunately, this is mostly duplicated from cppdefault.c */ 130 #if DEFAULT_LIBC == LIBC_MUSL 131 #define INCLUDE_DEFAULTS_MUSL_GPP \ 132 { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1, \ 133 GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 }, \ 134 { GPLUSPLUS_TOOL_INCLUDE_DIR, "G++", 1, 1, \ 135 GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 1 }, \ 136 { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1, \ 137 GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 }, 138 139 #ifdef LOCAL_INCLUDE_DIR 140 #define INCLUDE_DEFAULTS_MUSL_LOCAL \ 141 { LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 2 }, \ 142 { LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 0 }, 143 #else 144 #define INCLUDE_DEFAULTS_MUSL_LOCAL 145 #endif 146 147 #ifdef PREFIX_INCLUDE_DIR 148 #define INCLUDE_DEFAULTS_MUSL_PREFIX \ 149 { PREFIX_INCLUDE_DIR, 0, 0, 1, 0, 0}, 150 #else 151 #define INCLUDE_DEFAULTS_MUSL_PREFIX 152 #endif 153 154 #ifdef CROSS_INCLUDE_DIR 155 #define INCLUDE_DEFAULTS_MUSL_CROSS \ 156 { CROSS_INCLUDE_DIR, "GCC", 0, 0, 0, 0}, 157 #else 158 #define INCLUDE_DEFAULTS_MUSL_CROSS 159 #endif 160 161 #ifdef TOOL_INCLUDE_DIR 162 #define INCLUDE_DEFAULTS_MUSL_TOOL \ 163 { TOOL_INCLUDE_DIR, "BINUTILS", 0, 1, 0, 0}, 164 #else 165 #define INCLUDE_DEFAULTS_MUSL_TOOL 166 #endif 167 168 #ifdef NATIVE_SYSTEM_HEADER_DIR 169 #define INCLUDE_DEFAULTS_MUSL_NATIVE \ 170 { NATIVE_SYSTEM_HEADER_DIR, 0, 0, 0, 1, 2 }, \ 171 { NATIVE_SYSTEM_HEADER_DIR, 0, 0, 0, 1, 0 }, 172 #else 173 #define INCLUDE_DEFAULTS_MUSL_NATIVE 174 #endif 175 176 #if defined (CROSS_DIRECTORY_STRUCTURE) && !defined (TARGET_SYSTEM_ROOT) 177 # undef INCLUDE_DEFAULTS_MUSL_LOCAL 178 # define INCLUDE_DEFAULTS_MUSL_LOCAL 179 # undef INCLUDE_DEFAULTS_MUSL_NATIVE 180 # define INCLUDE_DEFAULTS_MUSL_NATIVE 181 #else 182 # undef INCLUDE_DEFAULTS_MUSL_CROSS 183 # define INCLUDE_DEFAULTS_MUSL_CROSS 184 #endif 185 186 #undef INCLUDE_DEFAULTS 187 #define INCLUDE_DEFAULTS \ 188 { \ 189 INCLUDE_DEFAULTS_MUSL_GPP \ 190 INCLUDE_DEFAULTS_MUSL_LOCAL \ 191 INCLUDE_DEFAULTS_MUSL_PREFIX \ 192 INCLUDE_DEFAULTS_MUSL_CROSS \ 193 INCLUDE_DEFAULTS_MUSL_TOOL \ 194 INCLUDE_DEFAULTS_MUSL_NATIVE \ 195 { GCC_INCLUDE_DIR, "GCC", 0, 1, 0, 0 }, \ 196 { 0, 0, 0, 0, 0, 0 } \ 197 } 198 #endif 199 200 #if (DEFAULT_LIBC == LIBC_UCLIBC) && defined (SINGLE_LIBC) /* uClinux */ 201 /* This is a *uclinux* target. We don't define below macros to normal linux 202 versions, because doing so would require *uclinux* targets to include 203 linux.c, linux-protos.h, linux.opt, etc. We could, alternatively, add 204 these files to *uclinux* targets, but that would only pollute option list 205 (add -mglibc, etc.) without adding any useful support. */ 206 207 /* Define TARGET_LIBC_HAS_FUNCTION for *uclinux* targets to 208 no_c99_libc_has_function, because uclibc does not, normally, have 209 c99 runtime. If, in special cases, uclibc does have c99 runtime, 210 this should be defined to a new hook. Also please note that for targets 211 like *-linux-uclibc that similar check will also need to be added to 212 linux_libc_has_function. */ 213 # undef TARGET_LIBC_HAS_FUNCTION 214 # define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function 215 216 #else /* !uClinux, i.e., normal Linux */ 217 218 /* Determine what functions are present at the runtime; 219 this includes full c99 runtime and sincos. */ 220 # undef TARGET_LIBC_HAS_FUNCTION 221 # define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function 222 223 #endif 224