/* 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) 1995-2023 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 . */ /* C libraries supported on Linux. */ #ifdef SINGLE_LIBC #define OPTION_GLIBC_P(opts) (DEFAULT_LIBC == LIBC_GLIBC) #define OPTION_UCLIBC_P(opts) (DEFAULT_LIBC == LIBC_UCLIBC) #define OPTION_BIONIC_P(opts) (DEFAULT_LIBC == LIBC_BIONIC) #undef OPTION_MUSL_P #define OPTION_MUSL_P(opts) (DEFAULT_LIBC == LIBC_MUSL) #else #define OPTION_GLIBC_P(opts) ((opts)->x_linux_libc == LIBC_GLIBC) #define OPTION_UCLIBC_P(opts) ((opts)->x_linux_libc == LIBC_UCLIBC) #define OPTION_BIONIC_P(opts) ((opts)->x_linux_libc == LIBC_BIONIC) #undef OPTION_MUSL_P #define OPTION_MUSL_P(opts) ((opts)->x_linux_libc == LIBC_MUSL) #endif #define OPTION_GLIBC OPTION_GLIBC_P (&global_options) #define OPTION_UCLIBC OPTION_UCLIBC_P (&global_options) #define OPTION_BIONIC OPTION_BIONIC_P (&global_options) #undef OPTION_MUSL #define OPTION_MUSL OPTION_MUSL_P (&global_options) #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 or musl is the default C library and whether -muclibc or -mglibc or -mbionic or -mmusl has been passed to change the default. */ #define CHOOSE_DYNAMIC_LINKER1(LIBC1, LIBC2, LIBC3, LIBC4, LD1, LD2, LD3, LD4) \ "%{" LIBC2 ":" LD2 ";:%{" LIBC3 ":" LD3 ";:%{" LIBC4 ":" LD4 ";:" LD1 "}}}" #if DEFAULT_LIBC == LIBC_GLIBC #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ CHOOSE_DYNAMIC_LINKER1 ("mglibc", "muclibc", "mbionic", "mmusl", G, U, B, M) #elif DEFAULT_LIBC == LIBC_UCLIBC #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ CHOOSE_DYNAMIC_LINKER1 ("muclibc", "mglibc", "mbionic", "mmusl", U, G, B, M) #elif DEFAULT_LIBC == LIBC_BIONIC #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ CHOOSE_DYNAMIC_LINKER1 ("mbionic", "mglibc", "muclibc", "mmusl", B, G, U, M) #elif DEFAULT_LIBC == LIBC_MUSL #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ CHOOSE_DYNAMIC_LINKER1 ("mmusl", "mglibc", "muclibc", "mbionic", M, G, U, B) #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" /* Should be redefined for each target that supports musl. */ #define MUSL_DYNAMIC_LINKER "/dev/null" #define MUSL_DYNAMIC_LINKER32 "/dev/null" #define MUSL_DYNAMIC_LINKER64 "/dev/null" #define MUSL_DYNAMIC_LINKERX32 "/dev/null" #define GNU_USER_DYNAMIC_LINKER \ CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER, \ BIONIC_DYNAMIC_LINKER, MUSL_DYNAMIC_LINKER) #define GNU_USER_DYNAMIC_LINKER32 \ CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, \ BIONIC_DYNAMIC_LINKER32, MUSL_DYNAMIC_LINKER32) #define GNU_USER_DYNAMIC_LINKER64 \ CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, \ BIONIC_DYNAMIC_LINKER64, MUSL_DYNAMIC_LINKER64) #define GNU_USER_DYNAMIC_LINKERX32 \ CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKERX32, UCLIBC_DYNAMIC_LINKERX32, \ BIONIC_DYNAMIC_LINKERX32, MUSL_DYNAMIC_LINKERX32) /* Whether we have Bionic libc runtime */ #undef TARGET_HAS_BIONIC #define TARGET_HAS_BIONIC (OPTION_BIONIC) /* musl avoids problematic includes by rearranging the include directories. * Unfortunately, this is mostly duplicated from cppdefault.cc */ #if DEFAULT_LIBC == LIBC_MUSL #define INCLUDE_DEFAULTS_MUSL_GPP \ { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1, \ GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 }, \ { GPLUSPLUS_TOOL_INCLUDE_DIR, "G++", 1, 1, \ GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 1 }, \ { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1, \ GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 }, #ifdef LOCAL_INCLUDE_DIR #define INCLUDE_DEFAULTS_MUSL_LOCAL \ { LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 2 }, \ { LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 0 }, #else #define INCLUDE_DEFAULTS_MUSL_LOCAL #endif #ifdef PREFIX_INCLUDE_DIR #define INCLUDE_DEFAULTS_MUSL_PREFIX \ { PREFIX_INCLUDE_DIR, 0, 0, 1, 0, 0}, #else #define INCLUDE_DEFAULTS_MUSL_PREFIX #endif #ifdef CROSS_INCLUDE_DIR #define INCLUDE_DEFAULTS_MUSL_CROSS \ { CROSS_INCLUDE_DIR, "GCC", 0, 0, 0, 0}, #else #define INCLUDE_DEFAULTS_MUSL_CROSS #endif #ifdef TOOL_INCLUDE_DIR #define INCLUDE_DEFAULTS_MUSL_TOOL \ { TOOL_INCLUDE_DIR, "BINUTILS", 0, 1, 0, 0}, #else #define INCLUDE_DEFAULTS_MUSL_TOOL #endif #ifdef NATIVE_SYSTEM_HEADER_DIR #define INCLUDE_DEFAULTS_MUSL_NATIVE \ { NATIVE_SYSTEM_HEADER_DIR, 0, 0, 0, 1, 2 }, \ { NATIVE_SYSTEM_HEADER_DIR, 0, 0, 0, 1, 0 }, #else #define INCLUDE_DEFAULTS_MUSL_NATIVE #endif #if defined (CROSS_DIRECTORY_STRUCTURE) && !defined (TARGET_SYSTEM_ROOT) # undef INCLUDE_DEFAULTS_MUSL_LOCAL # define INCLUDE_DEFAULTS_MUSL_LOCAL # undef INCLUDE_DEFAULTS_MUSL_NATIVE # define INCLUDE_DEFAULTS_MUSL_NATIVE #else # undef INCLUDE_DEFAULTS_MUSL_CROSS # define INCLUDE_DEFAULTS_MUSL_CROSS #endif #undef INCLUDE_DEFAULTS #define INCLUDE_DEFAULTS \ { \ INCLUDE_DEFAULTS_MUSL_GPP \ INCLUDE_DEFAULTS_MUSL_LOCAL \ INCLUDE_DEFAULTS_MUSL_PREFIX \ INCLUDE_DEFAULTS_MUSL_CROSS \ INCLUDE_DEFAULTS_MUSL_TOOL \ INCLUDE_DEFAULTS_MUSL_NATIVE \ { GCC_INCLUDE_DIR, "GCC", 0, 1, 0, 0 }, \ { 0, 0, 0, 0, 0, 0 } \ } #endif #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.cc, 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 */ /* 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