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 | # undef TARGET_LIBM_FUNCTION_MAX_ERROR |
216 | # define TARGET_LIBM_FUNCTION_MAX_ERROR linux_libm_function_max_error |
217 | |
218 | #endif |
219 | |