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) 1995-2015 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 #else 36 #define OPTION_GLIBC (linux_libc == LIBC_GLIBC) 37 #define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC) 38 #define OPTION_BIONIC (linux_libc == LIBC_BIONIC) 39 #endif 40 41 #define GNU_USER_TARGET_OS_CPP_BUILTINS() \ 42 do { \ 43 if (OPTION_GLIBC) \ 44 builtin_define ("__gnu_linux__"); \ 45 builtin_define_std ("linux"); \ 46 builtin_define_std ("unix"); \ 47 builtin_assert ("system=linux"); \ 48 builtin_assert ("system=unix"); \ 49 builtin_assert ("system=posix"); \ 50 } while (0) 51 52 /* Determine which dynamic linker to use depending on whether GLIBC or 53 uClibc or Bionic is the default C library and whether 54 -muclibc or -mglibc or -mbionic has been passed to change the default. */ 55 56 #define CHOOSE_DYNAMIC_LINKER1(LIBC1, LIBC2, LIBC3, LD1, LD2, LD3) \ 57 "%{" LIBC2 ":" LD2 ";:%{" LIBC3 ":" LD3 ";:" LD1 "}}" 58 59 #if DEFAULT_LIBC == LIBC_GLIBC 60 #define CHOOSE_DYNAMIC_LINKER(G, U, B) \ 61 CHOOSE_DYNAMIC_LINKER1 ("mglibc", "muclibc", "mbionic", G, U, B) 62 #elif DEFAULT_LIBC == LIBC_UCLIBC 63 #define CHOOSE_DYNAMIC_LINKER(G, U, B) \ 64 CHOOSE_DYNAMIC_LINKER1 ("muclibc", "mglibc", "mbionic", U, G, B) 65 #elif DEFAULT_LIBC == LIBC_BIONIC 66 #define CHOOSE_DYNAMIC_LINKER(G, U, B) \ 67 CHOOSE_DYNAMIC_LINKER1 ("mbionic", "mglibc", "muclibc", B, G, U) 68 #else 69 #error "Unsupported DEFAULT_LIBC" 70 #endif /* DEFAULT_LIBC */ 71 72 /* For most targets the following definitions suffice; 73 GLIBC_DYNAMIC_LINKER must be defined for each target using them, or 74 GLIBC_DYNAMIC_LINKER32 and GLIBC_DYNAMIC_LINKER64 for targets 75 supporting both 32-bit and 64-bit compilation. */ 76 #define UCLIBC_DYNAMIC_LINKER "/lib/ld-uClibc.so.0" 77 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0" 78 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0" 79 #define UCLIBC_DYNAMIC_LINKERX32 "/lib/ldx32-uClibc.so.0" 80 #define BIONIC_DYNAMIC_LINKER "/system/bin/linker" 81 #define BIONIC_DYNAMIC_LINKER32 "/system/bin/linker" 82 #define BIONIC_DYNAMIC_LINKER64 "/system/bin/linker64" 83 #define BIONIC_DYNAMIC_LINKERX32 "/system/bin/linkerx32" 84 85 #define GNU_USER_DYNAMIC_LINKER \ 86 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER, \ 87 BIONIC_DYNAMIC_LINKER) 88 #define GNU_USER_DYNAMIC_LINKER32 \ 89 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, \ 90 BIONIC_DYNAMIC_LINKER32) 91 #define GNU_USER_DYNAMIC_LINKER64 \ 92 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, \ 93 BIONIC_DYNAMIC_LINKER64) 94 #define GNU_USER_DYNAMIC_LINKERX32 \ 95 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKERX32, UCLIBC_DYNAMIC_LINKERX32, \ 96 BIONIC_DYNAMIC_LINKERX32) 97 98 /* Whether we have Bionic libc runtime */ 99 #undef TARGET_HAS_BIONIC 100 #define TARGET_HAS_BIONIC (OPTION_BIONIC) 101 102 #if (DEFAULT_LIBC == LIBC_UCLIBC) && defined (SINGLE_LIBC) /* uClinux */ 103 /* This is a *uclinux* target. We don't define below macros to normal linux 104 versions, because doing so would require *uclinux* targets to include 105 linux.c, linux-protos.h, linux.opt, etc. We could, alternatively, add 106 these files to *uclinux* targets, but that would only pollute option list 107 (add -mglibc, etc.) without adding any useful support. */ 108 109 /* Define TARGET_LIBC_HAS_FUNCTION for *uclinux* targets to 110 no_c99_libc_has_function, because uclibc does not, normally, have 111 c99 runtime. If, in special cases, uclibc does have c99 runtime, 112 this should be defined to a new hook. Also please note that for targets 113 like *-linux-uclibc that similar check will also need to be added to 114 linux_libc_has_function. */ 115 # undef TARGET_LIBC_HAS_FUNCTION 116 # define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function 117 118 #else /* !uClinux, i.e., normal Linux */ 119 120 /* Determine what functions are present at the runtime; 121 this includes full c99 runtime and sincos. */ 122 # undef TARGET_LIBC_HAS_FUNCTION 123 # define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function 124 125 #endif 126