224 lines
8.4 KiB
C
224 lines
8.4 KiB
C
/* Definitions for systems using the Linux kernel, with or without
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MMU, using ELF at the compiler level but possibly FLT for final
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linked executables and shared libraries in some no-MMU cases, and
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possibly with a choice of libc implementations.
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Copyright (C) 1995-2019 Free Software Foundation, Inc.
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Contributed by Eric Youngdale.
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Modified for stabs-in-ELF by H.J. Lu (hjl@lucon.org).
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* C libraries supported on Linux. */
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#ifdef SINGLE_LIBC
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#define OPTION_GLIBC (DEFAULT_LIBC == LIBC_GLIBC)
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#define OPTION_UCLIBC (DEFAULT_LIBC == LIBC_UCLIBC)
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#define OPTION_BIONIC (DEFAULT_LIBC == LIBC_BIONIC)
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#undef OPTION_MUSL
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#define OPTION_MUSL (DEFAULT_LIBC == LIBC_MUSL)
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#else
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#define OPTION_GLIBC (linux_libc == LIBC_GLIBC)
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#define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC)
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#define OPTION_BIONIC (linux_libc == LIBC_BIONIC)
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#undef OPTION_MUSL
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#define OPTION_MUSL (linux_libc == LIBC_MUSL)
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#endif
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#define GNU_USER_TARGET_OS_CPP_BUILTINS() \
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do { \
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if (OPTION_GLIBC) \
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builtin_define ("__gnu_linux__"); \
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builtin_define_std ("linux"); \
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builtin_define_std ("unix"); \
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builtin_assert ("system=linux"); \
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builtin_assert ("system=unix"); \
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builtin_assert ("system=posix"); \
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} while (0)
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#define GNU_USER_TARGET_D_OS_VERSIONS() \
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do { \
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builtin_version ("linux"); \
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if (OPTION_GLIBC) \
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builtin_version ("CRuntime_Glibc"); \
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else if (OPTION_UCLIBC) \
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builtin_version ("CRuntime_UClibc"); \
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else if (OPTION_BIONIC) \
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builtin_version ("CRuntime_Bionic"); \
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else if (OPTION_MUSL) \
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builtin_version ("CRuntime_Musl"); \
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} while (0)
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/* Determine which dynamic linker to use depending on whether GLIBC or
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uClibc or Bionic or musl is the default C library and whether
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-muclibc or -mglibc or -mbionic or -mmusl has been passed to change
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the default. */
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#define CHOOSE_DYNAMIC_LINKER1(LIBC1, LIBC2, LIBC3, LIBC4, LD1, LD2, LD3, LD4) \
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"%{" LIBC2 ":" LD2 ";:%{" LIBC3 ":" LD3 ";:%{" LIBC4 ":" LD4 ";:" LD1 "}}}"
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#if DEFAULT_LIBC == LIBC_GLIBC
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#define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \
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CHOOSE_DYNAMIC_LINKER1 ("mglibc", "muclibc", "mbionic", "mmusl", G, U, B, M)
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#elif DEFAULT_LIBC == LIBC_UCLIBC
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#define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \
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CHOOSE_DYNAMIC_LINKER1 ("muclibc", "mglibc", "mbionic", "mmusl", U, G, B, M)
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#elif DEFAULT_LIBC == LIBC_BIONIC
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#define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \
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CHOOSE_DYNAMIC_LINKER1 ("mbionic", "mglibc", "muclibc", "mmusl", B, G, U, M)
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#elif DEFAULT_LIBC == LIBC_MUSL
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#define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \
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CHOOSE_DYNAMIC_LINKER1 ("mmusl", "mglibc", "muclibc", "mbionic", M, G, U, B)
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#else
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#error "Unsupported DEFAULT_LIBC"
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#endif /* DEFAULT_LIBC */
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/* For most targets the following definitions suffice;
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GLIBC_DYNAMIC_LINKER must be defined for each target using them, or
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GLIBC_DYNAMIC_LINKER32 and GLIBC_DYNAMIC_LINKER64 for targets
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supporting both 32-bit and 64-bit compilation. */
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#define UCLIBC_DYNAMIC_LINKER "/lib/ld-uClibc.so.0"
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#define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
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#define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
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#define UCLIBC_DYNAMIC_LINKERX32 "/lib/ldx32-uClibc.so.0"
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#define BIONIC_DYNAMIC_LINKER "/system/bin/linker"
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#define BIONIC_DYNAMIC_LINKER32 "/system/bin/linker"
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#define BIONIC_DYNAMIC_LINKER64 "/system/bin/linker64"
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#define BIONIC_DYNAMIC_LINKERX32 "/system/bin/linkerx32"
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/* Should be redefined for each target that supports musl. */
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#define MUSL_DYNAMIC_LINKER "/dev/null"
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#define MUSL_DYNAMIC_LINKER32 "/dev/null"
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#define MUSL_DYNAMIC_LINKER64 "/dev/null"
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#define MUSL_DYNAMIC_LINKERX32 "/dev/null"
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#define GNU_USER_DYNAMIC_LINKER \
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CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER, \
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BIONIC_DYNAMIC_LINKER, MUSL_DYNAMIC_LINKER)
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#define GNU_USER_DYNAMIC_LINKER32 \
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CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, \
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BIONIC_DYNAMIC_LINKER32, MUSL_DYNAMIC_LINKER32)
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#define GNU_USER_DYNAMIC_LINKER64 \
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CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, \
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BIONIC_DYNAMIC_LINKER64, MUSL_DYNAMIC_LINKER64)
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#define GNU_USER_DYNAMIC_LINKERX32 \
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CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKERX32, UCLIBC_DYNAMIC_LINKERX32, \
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BIONIC_DYNAMIC_LINKERX32, MUSL_DYNAMIC_LINKERX32)
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/* Whether we have Bionic libc runtime */
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#undef TARGET_HAS_BIONIC
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#define TARGET_HAS_BIONIC (OPTION_BIONIC)
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/* musl avoids problematic includes by rearranging the include directories.
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* Unfortunately, this is mostly duplicated from cppdefault.c */
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#if DEFAULT_LIBC == LIBC_MUSL
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#define INCLUDE_DEFAULTS_MUSL_GPP \
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{ GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1, \
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GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 }, \
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{ GPLUSPLUS_TOOL_INCLUDE_DIR, "G++", 1, 1, \
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GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 1 }, \
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{ GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1, \
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GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 },
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#ifdef LOCAL_INCLUDE_DIR
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#define INCLUDE_DEFAULTS_MUSL_LOCAL \
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{ LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 2 }, \
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{ LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 0 },
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#else
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#define INCLUDE_DEFAULTS_MUSL_LOCAL
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#endif
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#ifdef PREFIX_INCLUDE_DIR
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#define INCLUDE_DEFAULTS_MUSL_PREFIX \
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{ PREFIX_INCLUDE_DIR, 0, 0, 1, 0, 0},
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#else
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#define INCLUDE_DEFAULTS_MUSL_PREFIX
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#endif
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#ifdef CROSS_INCLUDE_DIR
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#define INCLUDE_DEFAULTS_MUSL_CROSS \
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{ CROSS_INCLUDE_DIR, "GCC", 0, 0, 0, 0},
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#else
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#define INCLUDE_DEFAULTS_MUSL_CROSS
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#endif
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#ifdef TOOL_INCLUDE_DIR
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#define INCLUDE_DEFAULTS_MUSL_TOOL \
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{ TOOL_INCLUDE_DIR, "BINUTILS", 0, 1, 0, 0},
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#else
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#define INCLUDE_DEFAULTS_MUSL_TOOL
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#endif
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#ifdef NATIVE_SYSTEM_HEADER_DIR
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#define INCLUDE_DEFAULTS_MUSL_NATIVE \
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{ NATIVE_SYSTEM_HEADER_DIR, 0, 0, 0, 1, 2 }, \
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{ NATIVE_SYSTEM_HEADER_DIR, 0, 0, 0, 1, 0 },
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#else
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#define INCLUDE_DEFAULTS_MUSL_NATIVE
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#endif
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#if defined (CROSS_DIRECTORY_STRUCTURE) && !defined (TARGET_SYSTEM_ROOT)
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# undef INCLUDE_DEFAULTS_MUSL_LOCAL
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# define INCLUDE_DEFAULTS_MUSL_LOCAL
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# undef INCLUDE_DEFAULTS_MUSL_NATIVE
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# define INCLUDE_DEFAULTS_MUSL_NATIVE
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#else
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# undef INCLUDE_DEFAULTS_MUSL_CROSS
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# define INCLUDE_DEFAULTS_MUSL_CROSS
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#endif
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#undef INCLUDE_DEFAULTS
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#define INCLUDE_DEFAULTS \
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{ \
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INCLUDE_DEFAULTS_MUSL_GPP \
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INCLUDE_DEFAULTS_MUSL_LOCAL \
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INCLUDE_DEFAULTS_MUSL_PREFIX \
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INCLUDE_DEFAULTS_MUSL_CROSS \
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INCLUDE_DEFAULTS_MUSL_TOOL \
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INCLUDE_DEFAULTS_MUSL_NATIVE \
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{ GCC_INCLUDE_DIR, "GCC", 0, 1, 0, 0 }, \
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{ 0, 0, 0, 0, 0, 0 } \
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}
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#endif
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#if (DEFAULT_LIBC == LIBC_UCLIBC) && defined (SINGLE_LIBC) /* uClinux */
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/* This is a *uclinux* target. We don't define below macros to normal linux
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versions, because doing so would require *uclinux* targets to include
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linux.c, linux-protos.h, linux.opt, etc. We could, alternatively, add
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these files to *uclinux* targets, but that would only pollute option list
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(add -mglibc, etc.) without adding any useful support. */
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/* Define TARGET_LIBC_HAS_FUNCTION for *uclinux* targets to
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no_c99_libc_has_function, because uclibc does not, normally, have
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c99 runtime. If, in special cases, uclibc does have c99 runtime,
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this should be defined to a new hook. Also please note that for targets
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like *-linux-uclibc that similar check will also need to be added to
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linux_libc_has_function. */
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# undef TARGET_LIBC_HAS_FUNCTION
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# define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
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#else /* !uClinux, i.e., normal Linux */
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/* Determine what functions are present at the runtime;
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this includes full c99 runtime and sincos. */
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# undef TARGET_LIBC_HAS_FUNCTION
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# define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function
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#endif
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