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/* 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. */
#ifndef RUNTIME_ROOT_PREFIX
#define RUNTIME_ROOT_PREFIX ""
#endif
#define UCLIBC_DYNAMIC_LINKER RUNTIME_ROOT_PREFIX "/lib/ld-uClibc.so.0"
#define UCLIBC_DYNAMIC_LINKER32 RUNTIME_ROOT_PREFIX "/lib/ld-uClibc.so.0"
#define UCLIBC_DYNAMIC_LINKER64 RUNTIME_ROOT_PREFIX "/lib/ld64-uClibc.so.0"
#define UCLIBC_DYNAMIC_LINKERX32 RUNTIME_ROOT_PREFIX "/lib/ldx32-uClibc.so.0"
#define BIONIC_DYNAMIC_LINKER RUNTIME_ROOT_PREFIX "/system/bin/linker"
#define BIONIC_DYNAMIC_LINKER32 RUNTIME_ROOT_PREFIX "/system/bin/linker"
#define BIONIC_DYNAMIC_LINKER64 RUNTIME_ROOT_PREFIX "/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
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