netbsd-elf.h revision 1.9 
1/* Common configuration file for NetBSD ELF targets.
2   Copyright (C) 2002-2018 Free Software Foundation, Inc.
3   Contributed by Wasabi Systems, Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 3, or (at your option)
10any later version.
11
12GCC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING3.  If not see
19<http://www.gnu.org/licenses/>.  */
20
21/* TARGET_OS_CPP_BUILTINS() common to all NetBSD ELF targets.  */
22#define NETBSD_OS_CPP_BUILTINS_ELF()		\
23  do						\
24    {						\
25      NETBSD_OS_CPP_BUILTINS_COMMON();		\
26    }						\
27  while (0)
28
29/* Provide a STARTFILE_SPEC appropriate for NetBSD ELF.  Here we
30   provide support for the special GCC option -static.  On ELF
31   targets, we also add the crtbegin.o file, which provides part
32   of the support for getting C++ file-scope static objects
33   constructed before entering "main".  */
34
35#define NETBSD_STARTFILE_SPEC	\
36  "%{!shared:			\
37     %{pg:gcrt0%O%s}		\
38     %{!pg:			\
39       %{p:gcrt0%O%s}		\
40       %{!p:crt0%O%s}}}		\
41   %:if-exists(crti%O%s)	\
42   %{pie:crtbeginS%O%s}		\
43   %{!pie:			\
44     %{static:%:if-exists-else(crtbeginT%O%s crtbegin%O%s)} \
45     %{!static:                 \
46       %{shared:crtbeginS%O%s}	\
47       %{!shared:crtbegin%O%s}}}"
48
49#undef STARTFILE_SPEC
50#define STARTFILE_SPEC NETBSD_STARTFILE_SPEC
51
52
53/* Provide an ENDFILE_SPEC appropriate for NetBSD ELF.  Here we
54   add crtend.o, which provides part of the support for getting
55   C++ file-scope static objects deconstructed after exiting "main".  */
56
57#define NETBSD_ENDFILE_SPEC	\
58  "%{pie:crtendS%O%s}		\
59   %{!pie:			\
60     %{shared:crtendS%O%s}	\
61     %{!shared:crtend%O%s}}	\
62   %:if-exists(crtn%O%s)"
63
64#undef ENDFILE_SPEC
65#define ENDFILE_SPEC NETBSD_ENDFILE_SPEC
66
67/* Provide a LINK_SPEC appropriate for NetBSD ELF.  Here we provide
68   support for the special GCC options -assert, -R, -rpath, -shared,
69   -nostdlib, -static, -rdynamic, and -dynamic-linker.
70
71   Target-specific code can use this in conjunction with any other
72   target-specific LINK_SPEC options.
73
74   Target-specific code must provide the %(netbsd_entry_point) spec.  */
75
76#define NETBSD_LINK_LD_ELF_SO_SPEC \
77  "%{!dynamic-linker:-dynamic-linker /usr/libexec/ld.elf_so}"
78
79#define NETBSD_LINK_SPEC_ELF \
80  "%{assert*} %{R*} %{rpath*} \
81   %{shared:-shared} \
82   %{symbolic:-Bsymbolic} \
83   %{!shared: \
84     -dc -dp \
85     %{!nostdlib: \
86       %{!r: \
87	 %{!e*:-e %(netbsd_entry_point)}}} \
88     %{pie:-pie} \
89     %{!static: \
90       %{rdynamic:-export-dynamic} \
91       %(netbsd_link_ld_elf_so)} \
92     %{static:-static \
93       %{pie:--no-dynamic-linker}}} \
94   %{!shared:%{!nostdlib:%{!nodefaultlibs:\
95     %{%:sanitize(address): -lasan } \
96     %{%:sanitize(undefined): -lubsan}}}}"
97
98/* Provide the standard list of subtarget extra specs for NetBSD targets.  */
99#define NETBSD_SUBTARGET_EXTRA_SPECS \
100  { "netbsd_link_ld_elf_so",    NETBSD_LINK_LD_ELF_SO_SPEC }, \
101  { "netbsd_cpp_spec",          NETBSD_CPP_SPEC }, \
102  { "netbsd_link_spec",         NETBSD_LINK_SPEC_ELF }, \
103  { "netbsd_entry_point",       NETBSD_ENTRY_POINT }, \
104  { "netbsd_endfile_spec",      NETBSD_ENDFILE_SPEC },
105
106#undef SUBTARGET_EXTRA_SPECS
107#define SUBTARGET_EXTRA_SPECS   NETBSD_SUBTARGET_EXTRA_SPECS
108
109
110/* Use --as-needed -lgcc_s for eh support.  */
111#ifdef HAVE_LD_AS_NEEDED
112#define USE_LD_AS_NEEDED 1
113#endif
114
115#undef TARGET_UNWIND_TABLES_DEFAULT
116#define TARGET_UNWIND_TABLES_DEFAULT true
117
118#undef REAL_LIBGCC_SPEC
119#define REAL_LIBGCC_SPEC						   \
120   "%{static|static-libgcc:-lgcc}"					   \
121   "%{!static:%{!static-libgcc:--as-needed -lgcc_s --no-as-needed -lgcc}}"
122