303 lines
10 KiB
C
303 lines
10 KiB
C
/* Base configuration file for all OpenBSD targets.
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Copyright (C) 1999 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Common OpenBSD configuration.
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All OpenBSD architectures include this file, which is intended as
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a repository for common defines.
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Some defines are common to all architectures, a few of them are
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triggered by OBSD_* guards, so that we won't override architecture
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defaults by mistakes.
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OBSD_HAS_CORRECT_SPECS:
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another mechanism provides correct specs already.
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OBSD_NO_DYNAMIC_LIBRARIES:
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no implementation of dynamic libraries.
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OBSD_OLD_GAS:
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older flavor of gas which needs help for PIC.
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OBSD_HAS_DECLARE_FUNCTION_NAME, OBSD_HAS_DECLARE_FUNCTION_SIZE,
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OBSD_HAS_DECLARE_OBJECT:
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PIC support, FUNCTION_NAME/FUNCTION_SIZE are independent, whereas
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the corresponding logic for OBJECTS is necessarily coupled.
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There are also a few `default' defines such as ASM_WEAKEN_LABEL,
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intended as common ground for arch that don't provide
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anything suitable. */
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/* OPENBSD_NATIVE is defined only when gcc is configured as part of
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the OpenBSD source tree, specifically through Makefile.bsd-wrapper.
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In such a case the include path can be trimmed as there is no
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distinction between system includes and gcc includes. */
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/* This configuration method, namely Makefile.bsd-wrapper and
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OPENBSD_NATIVE is NOT recommended for building cross-compilers. */
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#ifdef OPENBSD_NATIVE
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#undef GCC_INCLUDE_DIR
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#define GCC_INCLUDE_DIR "/usr/include"
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/* The compiler is configured with ONLY the gcc/g++ standard headers. */
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#undef INCLUDE_DEFAULTS
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#define INCLUDE_DEFAULTS \
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{ \
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{ GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 }, \
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{ GCC_INCLUDE_DIR, "GCC", 0, 0 }, \
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{ 0, 0, 0, 0 } \
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}
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/* Under OpenBSD, the normal location of the various *crt*.o files is the
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/usr/lib directory. */
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#define STANDARD_STARTFILE_PREFIX "/usr/lib/"
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#endif
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/* Controlling the compilation driver. */
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/* CPP_SPEC appropriate for OpenBSD. We deal with -posix and -pthread.
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XXX the way threads are handling currently is not very satisfying,
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since all code must be compiled with -pthread to work.
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This two-stage defines makes it easy to pick that for targets that
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have subspecs. */
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#define OBSD_CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_POSIX_THREADS}"
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/* LIB_SPEC appropriate for OpenBSD. Select the appropriate libc,
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depending on profiling and threads. Basically,
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-lc(_r)?(_p)?, select _r for threads, and _p for p or pg. */
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#define OBSD_LIB_SPEC "-lc%{pthread:_r}%{p:_p}%{!p:%{pg:_p}}"
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#ifndef OBSD_HAS_CORRECT_SPECS
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#ifndef OBSD_NO_DYNAMIC_LIBRARIES
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#undef SWITCH_TAKES_ARG
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#define SWITCH_TAKES_ARG(CHAR) \
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(DEFAULT_SWITCH_TAKES_ARG (CHAR) \
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|| (CHAR) == 'R')
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#endif
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#undef CPP_SPEC
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#define CPP_SPEC OBSD_CPP_SPEC
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#ifdef OBSD_OLD_GAS
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/* ASM_SPEC appropriate for OpenBSD. For some architectures, OpenBSD
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still uses a special flavor of gas that needs to be told when generating
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pic code. */
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#undef ASM_SPEC
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#define ASM_SPEC "%{fpic:-k} %{fPIC:-k -K} %|"
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#else
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/* Since we use gas, stdin -> - is a good idea, but we don't want to
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override native specs just for that. */
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#ifndef ASM_SPEC
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#define ASM_SPEC "%|"
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#endif
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#endif
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/* LINK_SPEC appropriate for OpenBSD. Support for GCC options
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-static, -assert, and -nostdlib. */
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#undef LINK_SPEC
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#ifdef OBSD_NO_DYNAMIC_LIBRARIES
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#define LINK_SPEC \
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"%{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{assert*}"
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#else
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#define LINK_SPEC \
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"%{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{R*} %{static:-Bstatic} %{assert*}"
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#endif
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#undef LIB_SPEC
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#define LIB_SPEC OBSD_LIB_SPEC
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#endif
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/* Runtime target specification. */
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/* You must redefine CPP_PREDEFINES in any arch specific file. */
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#undef CPP_PREDEFINES
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/* Implicit calls to library routines. */
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/* Use memcpy and memset instead of bcopy and bzero. */
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#define TARGET_MEM_FUNCTIONS
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/* Miscellaneous parameters. */
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/* Tell libgcc2.c that OpenBSD targets support atexit. */
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#define HAVE_ATEXIT
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/* Controlling debugging info: dbx options. */
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/* Don't use the `xsTAG;' construct in DBX output; OpenBSD systems that
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use DBX don't support it. */
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#define DBX_NO_XREFS
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/* Support of shared libraries, mostly imported from svr4.h through netbsd. */
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/* Two differences from svr4.h:
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- we use . - _func instead of a local label,
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- we put extra spaces in expressions such as
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.type _func , @function
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This is more readable for a human being and confuses c++filt less. */
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/* Assembler format: output and generation of labels. */
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/* Define the strings used for the .type and .size directives.
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These strings generally do not vary from one system running OpenBSD
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to another, but if a given system needs to use different pseudo-op
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names for these, they may be overridden in the arch specific file. */
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/* OpenBSD assembler is hacked to have .type & .size support even in a.out
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format object files. Functions size are supported but not activated
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yet (look for GRACE_PERIOD_EXPIRED in gas/config/obj-aout.c). */
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#undef TYPE_ASM_OP
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#undef SIZE_ASM_OP
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#define TYPE_ASM_OP ".type"
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#define SIZE_ASM_OP ".size"
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/* The following macro defines the format used to output the second
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operand of the .type assembler directive. */
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#undef TYPE_OPERAND_FMT
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#define TYPE_OPERAND_FMT "@%s"
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/* Provision if extra assembler code is needed to declare a function's result
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(taken from svr4, not needed yet actually). */
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#ifndef ASM_DECLARE_RESULT
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#define ASM_DECLARE_RESULT(FILE, RESULT)
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#endif
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/* These macros generate the special .type and .size directives which
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are used to set the corresponding fields of the linker symbol table
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entries under OpenBSD. These macros also have to output the starting
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labels for the relevant functions/objects. */
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#ifndef OBSD_HAS_DECLARE_FUNCTION_NAME
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/* Extra assembler code needed to declare a function properly.
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Some assemblers may also need to also have something extra said
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about the function's return value. We allow for that here. */
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#undef ASM_DECLARE_FUNCTION_NAME
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#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
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do { \
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fprintf (FILE, "\t%s\t", TYPE_ASM_OP); \
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assemble_name (FILE, NAME); \
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fputs (" , ", FILE); \
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fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
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putc ('\n', FILE); \
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ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
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ASM_OUTPUT_LABEL(FILE, NAME); \
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} while (0)
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#endif
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#ifndef OBSD_HAS_DECLARE_FUNCTION_SIZE
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/* Declare the size of a function. */
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#undef ASM_DECLARE_FUNCTION_SIZE
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#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
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do { \
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if (!flag_inhibit_size_directive) \
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{ \
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fprintf (FILE, "\t%s\t", SIZE_ASM_OP); \
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assemble_name (FILE, (FNAME)); \
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fputs (" , . - ", FILE); \
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assemble_name (FILE, (FNAME)); \
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putc ('\n', FILE); \
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} \
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} while (0)
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#endif
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#ifndef OBSD_HAS_DECLARE_OBJECT
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/* Extra assembler code needed to declare an object properly. */
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#undef ASM_DECLARE_OBJECT_NAME
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#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
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do { \
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fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
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assemble_name (FILE, NAME); \
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fputs (" , ", FILE); \
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fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
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putc ('\n', FILE); \
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size_directive_output = 0; \
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if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
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{ \
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size_directive_output = 1; \
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fprintf (FILE, "\t%s\t", SIZE_ASM_OP); \
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assemble_name (FILE, NAME); \
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fprintf (FILE, " , %d\n", int_size_in_bytes (TREE_TYPE (DECL)));\
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} \
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ASM_OUTPUT_LABEL (FILE, NAME); \
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} while (0)
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/* Output the size directive for a decl in rest_of_decl_compilation
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in the case where we did not do so before the initializer.
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Once we find the error_mark_node, we know that the value of
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size_directive_output was set by ASM_DECLARE_OBJECT_NAME
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when it was run for the same decl. */
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#undef ASM_FINISH_DECLARE_OBJECT
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#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
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do { \
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char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
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if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
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&& ! AT_END && TOP_LEVEL \
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&& DECL_INITIAL (DECL) == error_mark_node \
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&& !size_directive_output) \
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{ \
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size_directive_output = 1; \
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fprintf (FILE, "\t%s\t", SIZE_ASM_OP); \
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assemble_name (FILE, name); \
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fprintf (FILE, " , %d\n", int_size_in_bytes (TREE_TYPE (DECL)));\
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} \
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} while (0)
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#endif
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/* Those are `generic' ways to weaken/globalize a label. We shouldn't need
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to override a processor specific definition. Hence, #ifndef ASM_*
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In case overriding turns out to be needed, one can always #undef ASM_*
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before including this file. */
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/* Tell the assembler that a symbol is weak. */
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/* Note: netbsd arm32 assembler needs a .globl here. An override may
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be needed when/if we go for arm32 support. */
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#ifndef ASM_WEAKEN_LABEL
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#define ASM_WEAKEN_LABEL(FILE,NAME) \
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do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
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fputc ('\n', FILE); } while (0)
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#endif
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/* Tell the assembler that a symbol is global. */
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#ifndef ASM_GLOBALIZE_LABEL
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#define ASM_GLOBALIZE_LABEL(FILE,NAME) \
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do { fputs ("\t.globl\t", FILE); assemble_name (FILE, NAME); \
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fputc ('\n', FILE); } while(0)
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#endif
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/* Storage layout. */
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/* We don't have to worry about binary compatibility with older C++ code,
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but there is a big known bug with vtable thunks which has not been
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fixed yet, so DON'T activate it by default. */
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/* #define DEFAULT_VTABLE_THUNKS 1 */
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/* Otherwise, since we support weak, gthr.h erroneously tries to use
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#pragma weak. */
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#define GTHREAD_USE_WEAK 0
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