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Diffstat (limited to 'gcc-4.9/gcc/config/linux.h')
| -rw-r--r-- | gcc-4.9/gcc/config/linux.h | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/config/linux.h b/gcc-4.9/gcc/config/linux.h new file mode 100644 index 000000000..d38ef81e3 --- /dev/null +++ b/gcc-4.9/gcc/config/linux.h @@ -0,0 +1,129 @@ +/* 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 |