| /* Definitions for systems using the Linux kernel, with or without |
| MMU, using ELF at the compiler level but possibly FLT for final |
| linked executables and shared libraries in some no-MMU cases, and |
| possibly with a choice of libc implementations. |
| Copyright (C) 1995-2014 Free Software Foundation, Inc. |
| Contributed by Eric Youngdale. |
| Modified for stabs-in-ELF by H.J. Lu (hjl@lucon.org). |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3, or (at your option) |
| any later version. |
| |
| GCC is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| Under Section 7 of GPL version 3, you are granted additional |
| permissions described in the GCC Runtime Library Exception, version |
| 3.1, as published by the Free Software Foundation. |
| |
| You should have received a copy of the GNU General Public License and |
| a copy of the GCC Runtime Library Exception along with this program; |
| see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* C libraries supported on Linux. */ |
| #ifdef SINGLE_LIBC |
| #define OPTION_GLIBC (DEFAULT_LIBC == LIBC_GLIBC) |
| #define OPTION_UCLIBC (DEFAULT_LIBC == LIBC_UCLIBC) |
| #define OPTION_BIONIC (DEFAULT_LIBC == LIBC_BIONIC) |
| #else |
| #define OPTION_GLIBC (linux_libc == LIBC_GLIBC) |
| #define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC) |
| #define OPTION_BIONIC (linux_libc == LIBC_BIONIC) |
| #endif |
| |
| #define GNU_USER_TARGET_OS_CPP_BUILTINS() \ |
| do { \ |
| if (OPTION_GLIBC) \ |
| builtin_define ("__gnu_linux__"); \ |
| builtin_define_std ("linux"); \ |
| builtin_define_std ("unix"); \ |
| builtin_assert ("system=linux"); \ |
| builtin_assert ("system=unix"); \ |
| builtin_assert ("system=posix"); \ |
| } while (0) |
| |
| /* Determine which dynamic linker to use depending on whether GLIBC or |
| uClibc or Bionic is the default C library and whether |
| -muclibc or -mglibc or -mbionic has been passed to change the default. */ |
| |
| #define CHOOSE_DYNAMIC_LINKER1(LIBC1, LIBC2, LIBC3, LD1, LD2, LD3) \ |
| "%{" LIBC2 ":" LD2 ";:%{" LIBC3 ":" LD3 ";:" LD1 "}}" |
| |
| #if DEFAULT_LIBC == LIBC_GLIBC |
| #define CHOOSE_DYNAMIC_LINKER(G, U, B) \ |
| CHOOSE_DYNAMIC_LINKER1 ("mglibc", "muclibc", "mbionic", G, U, B) |
| #elif DEFAULT_LIBC == LIBC_UCLIBC |
| #define CHOOSE_DYNAMIC_LINKER(G, U, B) \ |
| CHOOSE_DYNAMIC_LINKER1 ("muclibc", "mglibc", "mbionic", U, G, B) |
| #elif DEFAULT_LIBC == LIBC_BIONIC |
| #define CHOOSE_DYNAMIC_LINKER(G, U, B) \ |
| CHOOSE_DYNAMIC_LINKER1 ("mbionic", "mglibc", "muclibc", B, G, U) |
| #else |
| #error "Unsupported DEFAULT_LIBC" |
| #endif /* DEFAULT_LIBC */ |
| |
| /* For most targets the following definitions suffice; |
| GLIBC_DYNAMIC_LINKER must be defined for each target using them, or |
| GLIBC_DYNAMIC_LINKER32 and GLIBC_DYNAMIC_LINKER64 for targets |
| supporting both 32-bit and 64-bit compilation. */ |
| #define UCLIBC_DYNAMIC_LINKER "/lib/ld-uClibc.so.0" |
| #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0" |
| #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0" |
| #define UCLIBC_DYNAMIC_LINKERX32 "/lib/ldx32-uClibc.so.0" |
| #define BIONIC_DYNAMIC_LINKER "/system/bin/linker" |
| #define BIONIC_DYNAMIC_LINKER32 "/system/bin/linker" |
| #define BIONIC_DYNAMIC_LINKER64 "/system/bin/linker64" |
| #define BIONIC_DYNAMIC_LINKERX32 "/system/bin/linkerx32" |
| |
| #define GNU_USER_DYNAMIC_LINKER \ |
| CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER, \ |
| BIONIC_DYNAMIC_LINKER) |
| #define GNU_USER_DYNAMIC_LINKER32 \ |
| CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, \ |
| BIONIC_DYNAMIC_LINKER32) |
| #define GNU_USER_DYNAMIC_LINKER64 \ |
| CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, \ |
| BIONIC_DYNAMIC_LINKER64) |
| #define GNU_USER_DYNAMIC_LINKERX32 \ |
| CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKERX32, UCLIBC_DYNAMIC_LINKERX32, \ |
| BIONIC_DYNAMIC_LINKERX32) |
| |
| /* Whether we have Bionic libc runtime */ |
| #undef TARGET_HAS_BIONIC |
| #define TARGET_HAS_BIONIC (OPTION_BIONIC) |
| |
| #if (DEFAULT_LIBC == LIBC_UCLIBC) && defined (SINGLE_LIBC) /* uClinux */ |
| /* This is a *uclinux* target. We don't define below macros to normal linux |
| versions, because doing so would require *uclinux* targets to include |
| linux.c, linux-protos.h, linux.opt, etc. We could, alternatively, add |
| these files to *uclinux* targets, but that would only pollute option list |
| (add -mglibc, etc.) without adding any useful support. */ |
| |
| /* Define TARGET_LIBC_HAS_FUNCTION for *uclinux* targets to |
| no_c99_libc_has_function, because uclibc does not, normally, have |
| c99 runtime. If, in special cases, uclibc does have c99 runtime, |
| this should be defined to a new hook. Also please note that for targets |
| like *-linux-uclibc that similar check will also need to be added to |
| linux_libc_has_function. */ |
| # undef TARGET_LIBC_HAS_FUNCTION |
| # define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function |
| |
| #else /* !uClinux, i.e., normal Linux */ |
| |
| /* IFUNCs are supported by glibc, but not by uClibc or Bionic. */ |
| # undef TARGET_HAS_IFUNC_P |
| # define TARGET_HAS_IFUNC_P linux_has_ifunc_p |
| |
| /* Determine what functions are present at the runtime; |
| this includes full c99 runtime and sincos. */ |
| # undef TARGET_LIBC_HAS_FUNCTION |
| # define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function |
| |
| #endif |
