gcc/config/linux.h - gcc - Git at Google

 /* 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) 1995-2022 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_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)

 #define GNU_USER_TARGET_D_OS_VERSIONS()				\
     do {							\
 	builtin_version ("linux");				\
 	if (OPTION_GLIBC)					\
 	  builtin_version ("CRuntime_Glibc");			\
 	else if (OPTION_UCLIBC)					\
 	  builtin_version ("CRuntime_UClibc");			\
 	else if (OPTION_BIONIC)					\
 	  builtin_version ("CRuntime_Bionic");			\
 	else if (OPTION_MUSL)					\
 	  builtin_version ("CRuntime_Musl");			\
     } 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
	/* 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) 1995-2022 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_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)

	#define GNU_USER_TARGET_D_OS_VERSIONS() \
	do { \
	builtin_version ("linux"); \
	if (OPTION_GLIBC) \
	builtin_version ("CRuntime_Glibc"); \
	else if (OPTION_UCLIBC) \
	builtin_version ("CRuntime_UClibc"); \
	else if (OPTION_BIONIC) \
	builtin_version ("CRuntime_Bionic"); \
	else if (OPTION_MUSL) \
	builtin_version ("CRuntime_Musl"); \
	} 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