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) 1995-2018 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 /* Determine which dynamic linker to use depending on whether GLIBC or 57 uClibc or Bionic or musl is the default C library and whether 58 -muclibc or -mglibc or -mbionic or -mmusl has been passed to change 59 the default. */ 60 61 #define CHOOSE_DYNAMIC_LINKER1(LIBC1, LIBC2, LIBC3, LIBC4, LD1, LD2, LD3, LD4) \ 62 "%{" LIBC2 ":" LD2 ";:%{" LIBC3 ":" LD3 ";:%{" LIBC4 ":" LD4 ";:" LD1 "}}}" 63 64 #if DEFAULT_LIBC == LIBC_GLIBC 65 #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ 66 CHOOSE_DYNAMIC_LINKER1 ("mglibc", "muclibc", "mbionic", "mmusl", G, U, B, M) 67 #elif DEFAULT_LIBC == LIBC_UCLIBC 68 #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ 69 CHOOSE_DYNAMIC_LINKER1 ("muclibc", "mglibc", "mbionic", "mmusl", U, G, B, M) 70 #elif DEFAULT_LIBC == LIBC_BIONIC 71 #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ 72 CHOOSE_DYNAMIC_LINKER1 ("mbionic", "mglibc", "muclibc", "mmusl", B, G, U, M) 73 #elif DEFAULT_LIBC == LIBC_MUSL 74 #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ 75 CHOOSE_DYNAMIC_LINKER1 ("mmusl", "mglibc", "muclibc", "mbionic", M, G, U, B) 76 #else 77 #error "Unsupported DEFAULT_LIBC" 78 #endif /* DEFAULT_LIBC */ 79 80 /* For most targets the following definitions suffice; 81 GLIBC_DYNAMIC_LINKER must be defined for each target using them, or 82 GLIBC_DYNAMIC_LINKER32 and GLIBC_DYNAMIC_LINKER64 for targets 83 supporting both 32-bit and 64-bit compilation. */ 84 #define UCLIBC_DYNAMIC_LINKER "/lib/ld-uClibc.so.0" 85 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0" 86 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0" 87 #define UCLIBC_DYNAMIC_LINKERX32 "/lib/ldx32-uClibc.so.0" 88 #define BIONIC_DYNAMIC_LINKER "/system/bin/linker" 89 #define BIONIC_DYNAMIC_LINKER32 "/system/bin/linker" 90 #define BIONIC_DYNAMIC_LINKER64 "/system/bin/linker64" 91 #define BIONIC_DYNAMIC_LINKERX32 "/system/bin/linkerx32" 92 /* Should be redefined for each target that supports musl. */ 93 #define MUSL_DYNAMIC_LINKER "/dev/null" 94 #define MUSL_DYNAMIC_LINKER32 "/dev/null" 95 #define MUSL_DYNAMIC_LINKER64 "/dev/null" 96 #define MUSL_DYNAMIC_LINKERX32 "/dev/null" 97 98 #define GNU_USER_DYNAMIC_LINKER \ 99 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER, \ 100 BIONIC_DYNAMIC_LINKER, MUSL_DYNAMIC_LINKER) 101 #define GNU_USER_DYNAMIC_LINKER32 \ 102 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, \ 103 BIONIC_DYNAMIC_LINKER32, MUSL_DYNAMIC_LINKER32) 104 #define GNU_USER_DYNAMIC_LINKER64 \ 105 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, \ 106 BIONIC_DYNAMIC_LINKER64, MUSL_DYNAMIC_LINKER64) 107 #define GNU_USER_DYNAMIC_LINKERX32 \ 108 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKERX32, UCLIBC_DYNAMIC_LINKERX32, \ 109 BIONIC_DYNAMIC_LINKERX32, MUSL_DYNAMIC_LINKERX32) 110 111 /* Whether we have Bionic libc runtime */ 112 #undef TARGET_HAS_BIONIC 113 #define TARGET_HAS_BIONIC (OPTION_BIONIC) 114 115 /* musl avoids problematic includes by rearranging the include directories. 116 * Unfortunately, this is mostly duplicated from cppdefault.c */ 117 #if DEFAULT_LIBC == LIBC_MUSL 118 #define INCLUDE_DEFAULTS_MUSL_GPP \ 119 { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1, \ 120 GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 }, \ 121 { GPLUSPLUS_TOOL_INCLUDE_DIR, "G++", 1, 1, \ 122 GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 1 }, \ 123 { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1, \ 124 GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 }, 125 126 #ifdef LOCAL_INCLUDE_DIR 127 #define INCLUDE_DEFAULTS_MUSL_LOCAL \ 128 { LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 2 }, \ 129 { LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 0 }, 130 #else 131 #define INCLUDE_DEFAULTS_MUSL_LOCAL 132 #endif 133 134 #ifdef PREFIX_INCLUDE_DIR 135 #define INCLUDE_DEFAULTS_MUSL_PREFIX \ 136 { PREFIX_INCLUDE_DIR, 0, 0, 1, 0, 0}, 137 #else 138 #define INCLUDE_DEFAULTS_MUSL_PREFIX 139 #endif 140 141 #ifdef CROSS_INCLUDE_DIR 142 #define INCLUDE_DEFAULTS_MUSL_CROSS \ 143 { CROSS_INCLUDE_DIR, "GCC", 0, 0, 0, 0}, 144 #else 145 #define INCLUDE_DEFAULTS_MUSL_CROSS 146 #endif 147 148 #ifdef TOOL_INCLUDE_DIR 149 #define INCLUDE_DEFAULTS_MUSL_TOOL \ 150 { TOOL_INCLUDE_DIR, "BINUTILS", 0, 1, 0, 0}, 151 #else 152 #define INCLUDE_DEFAULTS_MUSL_TOOL 153 #endif 154 155 #ifdef NATIVE_SYSTEM_HEADER_DIR 156 #define INCLUDE_DEFAULTS_MUSL_NATIVE \ 157 { NATIVE_SYSTEM_HEADER_DIR, 0, 0, 0, 1, 2 }, \ 158 { NATIVE_SYSTEM_HEADER_DIR, 0, 0, 0, 1, 0 }, 159 #else 160 #define INCLUDE_DEFAULTS_MUSL_NATIVE 161 #endif 162 163 #if defined (CROSS_DIRECTORY_STRUCTURE) && !defined (TARGET_SYSTEM_ROOT) 164 # undef INCLUDE_DEFAULTS_MUSL_LOCAL 165 # define INCLUDE_DEFAULTS_MUSL_LOCAL 166 # undef INCLUDE_DEFAULTS_MUSL_NATIVE 167 # define INCLUDE_DEFAULTS_MUSL_NATIVE 168 #else 169 # undef INCLUDE_DEFAULTS_MUSL_CROSS 170 # define INCLUDE_DEFAULTS_MUSL_CROSS 171 #endif 172 173 #undef INCLUDE_DEFAULTS 174 #define INCLUDE_DEFAULTS \ 175 { \ 176 INCLUDE_DEFAULTS_MUSL_GPP \ 177 INCLUDE_DEFAULTS_MUSL_LOCAL \ 178 INCLUDE_DEFAULTS_MUSL_PREFIX \ 179 INCLUDE_DEFAULTS_MUSL_CROSS \ 180 INCLUDE_DEFAULTS_MUSL_TOOL \ 181 INCLUDE_DEFAULTS_MUSL_NATIVE \ 182 { GCC_INCLUDE_DIR, "GCC", 0, 1, 0, 0 }, \ 183 { 0, 0, 0, 0, 0, 0 } \ 184 } 185 #endif 186 187 #if (DEFAULT_LIBC == LIBC_UCLIBC) && defined (SINGLE_LIBC) /* uClinux */ 188 /* This is a *uclinux* target. We don't define below macros to normal linux 189 versions, because doing so would require *uclinux* targets to include 190 linux.c, linux-protos.h, linux.opt, etc. We could, alternatively, add 191 these files to *uclinux* targets, but that would only pollute option list 192 (add -mglibc, etc.) without adding any useful support. */ 193 194 /* Define TARGET_LIBC_HAS_FUNCTION for *uclinux* targets to 195 no_c99_libc_has_function, because uclibc does not, normally, have 196 c99 runtime. If, in special cases, uclibc does have c99 runtime, 197 this should be defined to a new hook. Also please note that for targets 198 like *-linux-uclibc that similar check will also need to be added to 199 linux_libc_has_function. */ 200 # undef TARGET_LIBC_HAS_FUNCTION 201 # define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function 202 203 #else /* !uClinux, i.e., normal Linux */ 204 205 /* Determine what functions are present at the runtime; 206 this includes full c99 runtime and sincos. */ 207 # undef TARGET_LIBC_HAS_FUNCTION 208 # define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function 209 210 #endif 211