1 /* Definitions for systems using the Linux kernel, with or without
2 MMU, using ELF at the compiler level but possibly FLT for final
3 linked executables and shared libraries in some no-MMU cases, and
4 possibly with a choice of libc implementations.
5 Copyright (C) 1995-2023 Free Software Foundation, Inc.
6 Contributed by Eric Youngdale.
7 Modified for stabs-in-ELF by H.J. Lu (hjl@lucon.org).
8
9 This file is part of GCC.
10
11 GCC is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3, or (at your option)
14 any later version.
15
16 GCC is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
20
21 Under Section 7 of GPL version 3, you are granted additional
22 permissions described in the GCC Runtime Library Exception, version
23 3.1, as published by the Free Software Foundation.
24
25 You should have received a copy of the GNU General Public License and
26 a copy of the GCC Runtime Library Exception along with this program;
27 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
28 <http://www.gnu.org/licenses/>. */
29
30 /* C libraries supported on Linux. */
31 #ifdef SINGLE_LIBC
32 #define OPTION_GLIBC_P(opts) (DEFAULT_LIBC == LIBC_GLIBC)
33 #define OPTION_UCLIBC_P(opts) (DEFAULT_LIBC == LIBC_UCLIBC)
34 #define OPTION_BIONIC_P(opts) (DEFAULT_LIBC == LIBC_BIONIC)
35 #undef OPTION_MUSL_P
36 #define OPTION_MUSL_P(opts) (DEFAULT_LIBC == LIBC_MUSL)
37 #else
38 #define OPTION_GLIBC_P(opts) ((opts)->x_linux_libc == LIBC_GLIBC)
39 #define OPTION_UCLIBC_P(opts) ((opts)->x_linux_libc == LIBC_UCLIBC)
40 #define OPTION_BIONIC_P(opts) ((opts)->x_linux_libc == LIBC_BIONIC)
41 #undef OPTION_MUSL_P
42 #define OPTION_MUSL_P(opts) ((opts)->x_linux_libc == LIBC_MUSL)
43 #endif
44 #define OPTION_GLIBC OPTION_GLIBC_P (&global_options)
45 #define OPTION_UCLIBC OPTION_UCLIBC_P (&global_options)
46 #define OPTION_BIONIC OPTION_BIONIC_P (&global_options)
47 #undef OPTION_MUSL
48 #define OPTION_MUSL OPTION_MUSL_P (&global_options)
49
50 #define GNU_USER_TARGET_OS_CPP_BUILTINS() \
51 do { \
52 if (OPTION_GLIBC) \
53 builtin_define ("__gnu_linux__"); \
54 builtin_define_std ("linux"); \
55 builtin_define_std ("unix"); \
56 builtin_assert ("system=linux"); \
57 builtin_assert ("system=unix"); \
58 builtin_assert ("system=posix"); \
59 } while (0)
60
61 /* Determine which dynamic linker to use depending on whether GLIBC or
62 uClibc or Bionic or musl is the default C library and whether
63 -muclibc or -mglibc or -mbionic or -mmusl has been passed to change
64 the default. */
65
66 #define CHOOSE_DYNAMIC_LINKER1(LIBC1, LIBC2, LIBC3, LIBC4, LD1, LD2, LD3, LD4) \
67 "%{" LIBC2 ":" LD2 ";:%{" LIBC3 ":" LD3 ";:%{" LIBC4 ":" LD4 ";:" LD1 "}}}"
68
69 #if DEFAULT_LIBC == LIBC_GLIBC
70 #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \
71 CHOOSE_DYNAMIC_LINKER1 ("mglibc", "muclibc", "mbionic", "mmusl", G, U, B, M)
72 #elif DEFAULT_LIBC == LIBC_UCLIBC
73 #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \
74 CHOOSE_DYNAMIC_LINKER1 ("muclibc", "mglibc", "mbionic", "mmusl", U, G, B, M)
75 #elif DEFAULT_LIBC == LIBC_BIONIC
76 #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \
77 CHOOSE_DYNAMIC_LINKER1 ("mbionic", "mglibc", "muclibc", "mmusl", B, G, U, M)
78 #elif DEFAULT_LIBC == LIBC_MUSL
79 #define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \
80 CHOOSE_DYNAMIC_LINKER1 ("mmusl", "mglibc", "muclibc", "mbionic", M, G, U, B)
81 #else
82 #error "Unsupported DEFAULT_LIBC"
83 #endif /* DEFAULT_LIBC */
84
85 /* For most targets the following definitions suffice;
86 GLIBC_DYNAMIC_LINKER must be defined for each target using them, or
87 GLIBC_DYNAMIC_LINKER32 and GLIBC_DYNAMIC_LINKER64 for targets
88 supporting both 32-bit and 64-bit compilation. */
89 #define UCLIBC_DYNAMIC_LINKER "/lib/ld-uClibc.so.0"
90 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
91 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
92 #define UCLIBC_DYNAMIC_LINKERX32 "/lib/ldx32-uClibc.so.0"
93 #define BIONIC_DYNAMIC_LINKER "/system/bin/linker"
94 #define BIONIC_DYNAMIC_LINKER32 "/system/bin/linker"
95 #define BIONIC_DYNAMIC_LINKER64 "/system/bin/linker64"
96 #define BIONIC_DYNAMIC_LINKERX32 "/system/bin/linkerx32"
97 /* Should be redefined for each target that supports musl. */
98 #define MUSL_DYNAMIC_LINKER "/dev/null"
99 #define MUSL_DYNAMIC_LINKER32 "/dev/null"
100 #define MUSL_DYNAMIC_LINKER64 "/dev/null"
101 #define MUSL_DYNAMIC_LINKERX32 "/dev/null"
102
103 #define GNU_USER_DYNAMIC_LINKER \
104 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER, \
105 BIONIC_DYNAMIC_LINKER, MUSL_DYNAMIC_LINKER)
106 #define GNU_USER_DYNAMIC_LINKER32 \
107 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, \
108 BIONIC_DYNAMIC_LINKER32, MUSL_DYNAMIC_LINKER32)
109 #define GNU_USER_DYNAMIC_LINKER64 \
110 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, \
111 BIONIC_DYNAMIC_LINKER64, MUSL_DYNAMIC_LINKER64)
112 #define GNU_USER_DYNAMIC_LINKERX32 \
113 CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKERX32, UCLIBC_DYNAMIC_LINKERX32, \
114 BIONIC_DYNAMIC_LINKERX32, MUSL_DYNAMIC_LINKERX32)
115
116 /* Whether we have Bionic libc runtime */
117 #undef TARGET_HAS_BIONIC
118 #define TARGET_HAS_BIONIC (OPTION_BIONIC)
119
120 /* musl avoids problematic includes by rearranging the include directories.
121 * Unfortunately, this is mostly duplicated from cppdefault.cc */
122 #if DEFAULT_LIBC == LIBC_MUSL
123 #define INCLUDE_DEFAULTS_MUSL_GPP \
124 { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1, \
125 GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 }, \
126 { GPLUSPLUS_TOOL_INCLUDE_DIR, "G++", 1, 1, \
127 GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 1 }, \
128 { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1, \
129 GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 },
130
131 #ifdef LOCAL_INCLUDE_DIR
132 #define INCLUDE_DEFAULTS_MUSL_LOCAL \
133 { LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 2 }, \
134 { LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 0 },
135 #else
136 #define INCLUDE_DEFAULTS_MUSL_LOCAL
137 #endif
138
139 #ifdef PREFIX_INCLUDE_DIR
140 #define INCLUDE_DEFAULTS_MUSL_PREFIX \
141 { PREFIX_INCLUDE_DIR, 0, 0, 1, 0, 0},
142 #else
143 #define INCLUDE_DEFAULTS_MUSL_PREFIX
144 #endif
145
146 #ifdef CROSS_INCLUDE_DIR
147 #define INCLUDE_DEFAULTS_MUSL_CROSS \
148 { CROSS_INCLUDE_DIR, "GCC", 0, 0, 0, 0},
149 #else
150 #define INCLUDE_DEFAULTS_MUSL_CROSS
151 #endif
152
153 #ifdef TOOL_INCLUDE_DIR
154 #define INCLUDE_DEFAULTS_MUSL_TOOL \
155 { TOOL_INCLUDE_DIR, "BINUTILS", 0, 1, 0, 0},
156 #else
157 #define INCLUDE_DEFAULTS_MUSL_TOOL
158 #endif
159
160 #ifdef NATIVE_SYSTEM_HEADER_DIR
161 #define INCLUDE_DEFAULTS_MUSL_NATIVE \
162 { NATIVE_SYSTEM_HEADER_DIR, 0, 0, 0, 1, 2 }, \
163 { NATIVE_SYSTEM_HEADER_DIR, 0, 0, 0, 1, 0 },
164 #else
165 #define INCLUDE_DEFAULTS_MUSL_NATIVE
166 #endif
167
168 #if defined (CROSS_DIRECTORY_STRUCTURE) && !defined (TARGET_SYSTEM_ROOT)
169 # undef INCLUDE_DEFAULTS_MUSL_LOCAL
170 # define INCLUDE_DEFAULTS_MUSL_LOCAL
171 # undef INCLUDE_DEFAULTS_MUSL_NATIVE
172 # define INCLUDE_DEFAULTS_MUSL_NATIVE
173 #else
174 # undef INCLUDE_DEFAULTS_MUSL_CROSS
175 # define INCLUDE_DEFAULTS_MUSL_CROSS
176 #endif
177
178 #undef INCLUDE_DEFAULTS
179 #define INCLUDE_DEFAULTS \
180 { \
181 INCLUDE_DEFAULTS_MUSL_GPP \
182 INCLUDE_DEFAULTS_MUSL_LOCAL \
183 INCLUDE_DEFAULTS_MUSL_PREFIX \
184 INCLUDE_DEFAULTS_MUSL_CROSS \
185 INCLUDE_DEFAULTS_MUSL_TOOL \
186 INCLUDE_DEFAULTS_MUSL_NATIVE \
187 { GCC_INCLUDE_DIR, "GCC", 0, 1, 0, 0 }, \
188 { 0, 0, 0, 0, 0, 0 } \
189 }
190 #endif
191
192 #if (DEFAULT_LIBC == LIBC_UCLIBC) && defined (SINGLE_LIBC) /* uClinux */
193 /* This is a *uclinux* target. We don't define below macros to normal linux
194 versions, because doing so would require *uclinux* targets to include
195 linux.cc, linux-protos.h, linux.opt, etc. We could, alternatively, add
196 these files to *uclinux* targets, but that would only pollute option list
197 (add -mglibc, etc.) without adding any useful support. */
198
199 /* Define TARGET_LIBC_HAS_FUNCTION for *uclinux* targets to
200 no_c99_libc_has_function, because uclibc does not, normally, have
201 c99 runtime. If, in special cases, uclibc does have c99 runtime,
202 this should be defined to a new hook. Also please note that for targets
203 like *-linux-uclibc that similar check will also need to be added to
204 linux_libc_has_function. */
205 # undef TARGET_LIBC_HAS_FUNCTION
206 # define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
207
208 #else /* !uClinux, i.e., normal Linux */
209
210 /* Determine what functions are present at the runtime;
211 this includes full c99 runtime and sincos. */
212 # undef TARGET_LIBC_HAS_FUNCTION
213 # define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function
214
215 #endif