* configure.in :Handle OpenBSD platforms.

        * configure: Rebuilt.
        * config/openbsd.h: New file.
        * config/xm-openbsd.h: New file.
        * config/t-openbsd: New file.
        * config/t-openbsd-thread: New file.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@25293 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 302 insertions, 0 deletions

diff --git a/gcc/config/openbsd.h b/gcc/config/openbsd.h
new file mode 100644
index 00000000000..af8358eb153
--- /dev/null
+++ b/gcc/config/openbsd.h
@@ -0,0 +1,302 @@
+/* Base configuration file for all OpenBSD targets.
+   Copyright (C) 1999 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC 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 2, or (at your option)
+any later version.
+
+GNU CC 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.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Common OpenBSD configuration. 
+   All OpenBSD architectures include this file, which is intended as
+   a repository for common defines. 
+
+   Some defines are common to all architectures, a few of them are
+   triggered by OBSD_* guards, so that we won't override architecture
+   defaults by mistakes.
+
+   OBSD_HAS_CORRECT_SPECS: 
+      another mechanism provides correct specs already.
+   OBSD_NO_DYNAMIC_LIBRARIES: 
+      no implementation of dynamic libraries.
+   OBSD_OLD_GAS: 
+      older flavor of gas which needs help for PIC.
+   OBSD_HAS_DECLARE_FUNCTION_NAME, OBSD_HAS_DECLARE_FUNCTION_SIZE,
+   OBSD_HAS_DECLARE_OBJECT: 
+      PIC support, FUNCTION_NAME/FUNCTION_SIZE are independent, whereas
+      the corresponding logic for OBJECTS is necessarily coupled.
+
+   There are also a few `default' defines such as ASM_WEAKEN_LABEL,
+   intended as common ground for arch that don't provide 
+   anything suitable.  */
+
+/* OPENBSD_NATIVE is defined only when gcc is configured as part of
+   the OpenBSD source tree, specifically through Makefile.bsd-wrapper.
+
+   In such a case the include path can be trimmed as there is no
+   distinction between system includes and gcc includes.  */
+
+/* This configuration method, namely Makefile.bsd-wrapper and
+   OPENBSD_NATIVE is NOT recommended for building cross-compilers.  */
+
+#ifdef OPENBSD_NATIVE
+
+#undef GCC_INCLUDE_DIR
+#define GCC_INCLUDE_DIR "/usr/include"
+
+/* The compiler is configured with ONLY the gcc/g++ standard headers.  */
+#undef INCLUDE_DEFAULTS
+#define INCLUDE_DEFAULTS			\
+  {						\
+    { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 },	\
+    { GCC_INCLUDE_DIR, "GCC", 0, 0 },		\
+    { 0, 0, 0, 0 }				\
+  }
+
+/* Under OpenBSD, the normal location of the various *crt*.o files is the
+   /usr/lib directory.  */
+#define STANDARD_STARTFILE_PREFIX	"/usr/lib/"
+
+#endif
+
+
+/* Controlling the compilation driver.  */
+
+/* CPP_SPEC appropriate for OpenBSD. We deal with -posix and -pthread.
+   XXX the way threads are handling currently is not very satisfying,
+   since all code must be compiled with -pthread to work. 
+   This two-stage defines makes it easy to pick that for targets that
+   have subspecs.  */
+#define OBSD_CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_POSIX_THREADS}"
+
+/* LIB_SPEC appropriate for OpenBSD.  Select the appropriate libc, 
+   depending on profiling and threads.  Basically, 
+   -lc(_r)?(_p)?, select _r for threads, and _p for p or pg.  */
+#define OBSD_LIB_SPEC "-lc%{pthread:_r}%{p:_p}%{!p:%{pg:_p}}"
+
+#ifndef OBSD_HAS_CORRECT_SPECS
+
+#ifndef OBSD_NO_DYNAMIC_LIBRARIES
+#undef SWITCH_TAKES_ARG
+#define SWITCH_TAKES_ARG(CHAR) \
+  (DEFAULT_SWITCH_TAKES_ARG (CHAR) \
+   || (CHAR) == 'R')
+#endif
+
+#undef CPP_SPEC
+#define CPP_SPEC OBSD_CPP_SPEC
+
+#ifdef OBSD_OLD_GAS
+/* ASM_SPEC appropriate for OpenBSD.  For some architectures, OpenBSD 
+   still uses a special flavor of gas that needs to be told when generating 
+   pic code.  */
+#undef ASM_SPEC
+#define ASM_SPEC "%{fpic:-k} %{fPIC:-k -K} %|"
+#else
+/* Since we use gas, stdin -> - is a good idea, but we don't want to
+   override native specs just for that.  */
+#ifndef ASM_SPEC
+#define ASM_SPEC "%|"
+#endif
+#endif
+
+/* LINK_SPEC appropriate for OpenBSD.  Support for GCC options 
+   -static, -assert, and -nostdlib.  */
+#undef LINK_SPEC
+#ifdef OBSD_NO_DYNAMIC_LIBRARIES
+#define LINK_SPEC \
+  "%{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{assert*}"
+#else
+#define LINK_SPEC \
+  "%{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{R*} %{static:-Bstatic} %{assert*}"
+#endif
+
+#undef LIB_SPEC
+#define LIB_SPEC OBSD_LIB_SPEC
+#endif
+
+
+/* Runtime target specification.  */
+
+/* You must redefine CPP_PREDEFINES in any arch specific file.  */
+#undef CPP_PREDEFINES
+
+/* Implicit calls to library routines.  */
+
+/* Use memcpy and memset instead of bcopy and bzero.  */
+#define TARGET_MEM_FUNCTIONS
+
+/* Miscellaneous parameters.  */
+
+/* Tell libgcc2.c that OpenBSD targets support atexit.  */
+#define HAVE_ATEXIT
+
+/* Controlling debugging info: dbx options.  */
+
+/* Don't use the `xsTAG;' construct in DBX output; OpenBSD systems that
+   use DBX don't support it.  */
+#define DBX_NO_XREFS
+
+
+/* Support of shared libraries, mostly imported from svr4.h through netbsd.  */
+/* Two differences from svr4.h:
+   - we use . - _func instead of a local label,
+   - we put extra spaces in expressions such as 
+     .type _func , @function
+     This is more readable for a human being and confuses c++filt less.  */
+
+/* Assembler format: output and generation of labels.  */
+
+/* Define the strings used for the .type and .size directives.
+   These strings generally do not vary from one system running OpenBSD
+   to another, but if a given system needs to use different pseudo-op
+   names for these, they may be overridden in the arch specific file.  */ 
+
+/* OpenBSD assembler is hacked to have .type & .size support even in a.out
+   format object files.  Functions size are supported but not activated 
+   yet (look for GRACE_PERIOD_EXPIRED in gas/config/obj-aout.c).  */
+
+#undef TYPE_ASM_OP
+#undef SIZE_ASM_OP
+
+#define TYPE_ASM_OP	".type"
+#define SIZE_ASM_OP	".size"
+
+/* The following macro defines the format used to output the second
+   operand of the .type assembler directive.  */
+#undef TYPE_OPERAND_FMT
+#define TYPE_OPERAND_FMT	"@%s"
+
+/* Provision if extra assembler code is needed to declare a function's result
+   (taken from svr4, not needed yet actually).  */
+#ifndef ASM_DECLARE_RESULT
+#define ASM_DECLARE_RESULT(FILE, RESULT)
+#endif
+
+/* These macros generate the special .type and .size directives which
+   are used to set the corresponding fields of the linker symbol table
+   entries under OpenBSD.  These macros also have to output the starting 
+   labels for the relevant functions/objects.  */
+
+#ifndef OBSD_HAS_DECLARE_FUNCTION_NAME
+/* Extra assembler code needed to declare a function properly.
+   Some assemblers may also need to also have something extra said 
+   about the function's return value.  We allow for that here.  */
+#undef ASM_DECLARE_FUNCTION_NAME
+#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)			\
+  do {									\
+    fprintf (FILE, "\t%s\t", TYPE_ASM_OP);				\
+    assemble_name (FILE, NAME);						\
+    fputs (" , ", FILE);						\
+    fprintf (FILE, TYPE_OPERAND_FMT, "function");			\
+    putc ('\n', FILE);							\
+    ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));			\
+    ASM_OUTPUT_LABEL(FILE, NAME);					\
+  } while (0)
+#endif
+
+#ifndef OBSD_HAS_DECLARE_FUNCTION_SIZE
+/* Declare the size of a function.  */
+#undef ASM_DECLARE_FUNCTION_SIZE
+#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)			\
+  do {									\
+    if (!flag_inhibit_size_directive)					\
+      {									\
+	fprintf (FILE, "\t%s\t", SIZE_ASM_OP);				\
+	assemble_name (FILE, (FNAME));					\
+	fputs (" , . - ", FILE);					\
+	assemble_name (FILE, (FNAME));					\
+	putc ('\n', FILE);						\
+      }									\
+  } while (0)
+#endif
+
+#ifndef OBSD_HAS_DECLARE_OBJECT
+/* Extra assembler code needed to declare an object properly.  */
+#undef ASM_DECLARE_OBJECT_NAME
+#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)			\
+  do {									\
+    fprintf (FILE, "\t%s\t ", TYPE_ASM_OP);				\
+    assemble_name (FILE, NAME);						\
+    fputs (" , ", FILE);						\
+    fprintf (FILE, TYPE_OPERAND_FMT, "object");				\
+    putc ('\n', FILE);							\
+    size_directive_output = 0;						\
+    if (!flag_inhibit_size_directive && DECL_SIZE (DECL))		\
+      {									\
+	size_directive_output = 1;					\
+	fprintf (FILE, "\t%s\t", SIZE_ASM_OP);				\
+	assemble_name (FILE, NAME);					\
+	fprintf (FILE, " , %d\n", int_size_in_bytes (TREE_TYPE (DECL)));\
+      }									\
+    ASM_OUTPUT_LABEL (FILE, NAME);					\
+  } while (0)
+
+/* Output the size directive for a decl in rest_of_decl_compilation
+   in the case where we did not do so before the initializer.
+   Once we find the error_mark_node, we know that the value of
+   size_directive_output was set by ASM_DECLARE_OBJECT_NAME 
+   when it was run for the same decl.  */
+#undef ASM_FINISH_DECLARE_OBJECT
+#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)	 \
+do {									 \
+     char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);			 \
+     if (!flag_inhibit_size_directive && DECL_SIZE (DECL)		 \
+         && ! AT_END && TOP_LEVEL					 \
+	 && DECL_INITIAL (DECL) == error_mark_node			 \
+	 && !size_directive_output)					 \
+       {								 \
+	 size_directive_output = 1;					 \
+	 fprintf (FILE, "\t%s\t", SIZE_ASM_OP);			 \
+	 assemble_name (FILE, name);					 \
+	 fprintf (FILE, " , %d\n", int_size_in_bytes (TREE_TYPE (DECL)));\
+       }								 \
+   } while (0)
+#endif
+
+
+/* Those are `generic' ways to weaken/globalize a label. We shouldn't need
+   to override a processor specific definition. Hence, #ifndef ASM_*
+   In case overriding turns out to be needed, one can always #undef ASM_* 
+   before including this file.  */
+
+/* Tell the assembler that a symbol is weak.  */
+/* Note: netbsd arm32 assembler needs a .globl here. An override may 
+   be needed when/if we go for arm32 support.  */
+#ifndef ASM_WEAKEN_LABEL
+#define ASM_WEAKEN_LABEL(FILE,NAME) \
+  do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
+       fputc ('\n', FILE); } while (0)
+#endif
+
+/* Tell the assembler that a symbol is global.  */
+#ifndef ASM_GLOBALIZE_LABEL
+#define ASM_GLOBALIZE_LABEL(FILE,NAME) \
+  do { fputs ("\t.globl\t", FILE); assemble_name (FILE, NAME); \
+       fputc ('\n', FILE); } while(0)
+#endif
+
+
+/* Storage layout.  */
+
+/* We don't have to worry about binary compatibility with older C++ code,
+   but there is a big known bug with vtable thunks which has not been
+   fixed yet, so DON'T activate it by default.  */
+/* #define DEFAULT_VTABLE_THUNKS 1 */
+
+
+/* Otherwise, since we support weak, gthr.h erroneously tries to use
+   #pragma weak.  */
+#define GTHREAD_USE_WEAK 0
+