configure.in (i?86-*-beos{pe,elf,}*): Recognize.

        * configure.in (i?86-*-beos{pe,elf,}*): Recognize.
        * i386/t-beos, i386/x-beos, i386/xm-beos.h: New files.
        * i386/beos-elf.h, i386/beos-pe.h: New files.

        * Makefile.in (CROSS_SYSTEM_HEADER_DIR): New.
        * cross-make (SYSTEM_HEADER_DIR): Define using
        CROSS_SYSTEM_HEADER_DIR.

        * gcc.c (LIBRARY_PATH_ENV): Provide default.
        (process_command): Use it.
        (main): Likewise.  Kill trailing = from env vars.
        (build_search_list): Put it back.
        * collect2.c (main): Use LIBRARY_PATH_ENV.

        * configure.in (GCC_NEED_DECLARATIONS): Add environ.
        * toplev.c: Use NEED_DECLARATION_ENVIRON.

        * tm.texi (Frame Layout): Document SMALL_STACK.
        * c-common.c (c_common_nodes_and_builtins): Check it.

        * system.h: Undef alloca after including glibc's <stdlib.h>,
        if USE_C_ALLOCA is defined.

        * gcc.c (set_input): New fn.
        (main): After all input files are compiled, reset the input file
        info to the first.

        * aclocal.m4 (rindex, index): If already defined, don't attempt
        to redefine.

        * ginclude/varargs.h: (__va_list__): Define ifndef.
        * ginclude/stdarg.h: Likewise.

        * ginclude/stddef.h (__WCHAR_TYPE__) [BEOS]: Use int
        instead of unsigned char.

        * hash.h (true, false, boolean): Undef before enum.

From-SVN: r31366

19 files changed, 764 insertions, 34 deletions

diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 932ab36a5e5..fc7f2d0fdc7 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -209,6 +209,9 @@ RANLIB_TEST_FOR_TARGET = \
 # Dir to search for system headers.  Overridden by cross-make.
 SYSTEM_HEADER_DIR = /usr/include
 
+# Default cross SYSTEM_HEADER_DIR, to be overridden by targets.
+CROSS_SYSTEM_HEADER_DIR = $(tooldir)/sys-include
+
 # Control whether to run fixproto.
 STMP_FIXPROTO = stmp-fixproto
 
diff --git a/gcc/aclocal.m4 b/gcc/aclocal.m4
index 543938325ed..300127f2931 100644
--- a/gcc/aclocal.m4
+++ b/gcc/aclocal.m4
@@ -35,11 +35,15 @@ AC_CACHE_VAL(gcc_cv_decl_needed_$1,
 #include <unistd.h>
 #endif
 #ifndef HAVE_RINDEX
+#ifndef rindex
 #define rindex strrchr
 #endif
+#endif
 #ifndef HAVE_INDEX
+#ifndef index
 #define index strchr
 #endif
+#endif
 $2],
 [char *(*pfn) = (char *(*)) $1],
 eval "gcc_cv_decl_needed_$1=no", eval "gcc_cv_decl_needed_$1=yes")])
diff --git a/gcc/c-common.c b/gcc/c-common.c
index b07600c69b2..b4353506e08 100644
--- a/gcc/c-common.c
+++ b/gcc/c-common.c
@@ -3650,10 +3650,12 @@ c_common_nodes_and_builtins (cplus_mode, no_builtins, no_nonansi_builtins)
      Declare _exit just to mark it as volatile.  */
   if (! no_builtins && ! no_nonansi_builtins)
     {
+#ifndef SMALL_STACK
       temp = builtin_function ("alloca", ptr_ftype_sizetype,
 			       BUILT_IN_ALLOCA, BUILT_IN_NORMAL, NULL_PTR);
       /* Suppress error if redefined as a non-function.  */
       DECL_BUILT_IN_NONANSI (temp) = 1;
+#endif
       temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS,
 			       BUILT_IN_NORMAL, NULL_PTR);
       /* Suppress error if redefined as a non-function.  */
diff --git a/gcc/collect2.c b/gcc/collect2.c
index 9689599aac2..cb5e2fa1d47 100644
--- a/gcc/collect2.c
+++ b/gcc/collect2.c
@@ -42,6 +42,10 @@ Boston, MA 02111-1307, USA.  */
                lib$get_current_invo_context(decc$$get_vfork_jmpbuf()) : -1)
 #endif /* VMS */
 
+#ifndef LIBRARY_PATH_ENV
+#define LIBRARY_PATH_ENV "LIBRARY_PATH"
+#endif
+
 #define COLLECT
 
 #include "collect2.h"
@@ -1353,9 +1357,9 @@ main (argc, argv)
       if (ptr)
 	fprintf (stderr, "COMPILER_PATH       = %s\n", ptr);
 
-      ptr = getenv ("LIBRARY_PATH");
+      ptr = getenv (LIBRARY_PATH_ENV);
       if (ptr)
-	fprintf (stderr, "LIBRARY_PATH        = %s\n", ptr);
+	fprintf (stderr, "%-20s= %s\n", LIBRARY_PATH_ENV, ptr);
 
       fprintf (stderr, "\n");
     }
diff --git a/gcc/config/i386/beos-elf.h b/gcc/config/i386/beos-elf.h
new file mode 100644
index 00000000000..44524df5a99
--- /dev/null
+++ b/gcc/config/i386/beos-elf.h
@@ -0,0 +1,436 @@
+/* Definitions for Intel x86 running BeOS
+   Copyright (C) 1998-99, 2000 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.  */
+
+#include <i386/i386.h>	/* Base i386 target machine definitions */
+#include <i386/att.h>	/* Use the i386 AT&T assembler syntax */
+#include <svr4.h>	/* some common stuff */
+
+#undef TARGET_VERSION
+#define TARGET_VERSION fprintf (stderr, " (i386 BeOS/ELF)");
+
+/* Change debugging to Dwarf2.  */
+#undef PREFERRED_DEBUGGING_TYPE
+#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
+
+/* The SVR4 ABI for the i386 says that records and unions are returned
+   in memory.  */
+#undef DEFAULT_PCC_STRUCT_RETURN
+#define DEFAULT_PCC_STRUCT_RETURN 1
+
+#undef ASM_COMMENT_START
+#define ASM_COMMENT_START " #"
+
+/* This is how to output an element of a case-vector that is relative.
+   This is only used for PIC code.  See comments by the `casesi' insn in
+   i386.md for an explanation of the expression this outputs. */
+#undef ASM_OUTPUT_ADDR_DIFF_ELT
+#define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
+  fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
+
+/* Indicate that jump tables go in the text section.  This is
+   necessary when compiling PIC code.  */
+#define JUMP_TABLES_IN_TEXT_SECTION (flag_pic)
+
+/* Copy this from the svr4 specifications... */
+/* Define the register numbers to be used in Dwarf debugging information.
+   The SVR4 reference port C compiler uses the following register numbers
+   in its Dwarf output code:
+	0 for %eax (gnu regno = 0)
+	1 for %ecx (gnu regno = 2)
+	2 for %edx (gnu regno = 1)
+	3 for %ebx (gnu regno = 3)
+	4 for %esp (gnu regno = 7)
+	5 for %ebp (gnu regno = 6)
+	6 for %esi (gnu regno = 4)
+	7 for %edi (gnu regno = 5)
+   The following three DWARF register numbers are never generated by
+   the SVR4 C compiler or by the GNU compilers, but SDB on x86/svr4
+   believes these numbers have these meanings.
+	8  for %eip    (no gnu equivalent)
+	9  for %eflags (no gnu equivalent)
+	10 for %trapno (no gnu equivalent)
+   It is not at all clear how we should number the FP stack registers
+   for the x86 architecture.  If the version of SDB on x86/svr4 were
+   a bit less brain dead with respect to floating-point then we would
+   have a precedent to follow with respect to DWARF register numbers
+   for x86 FP registers, but the SDB on x86/svr4 is so completely
+   broken with respect to FP registers that it is hardly worth thinking
+   of it as something to strive for compatibility with.
+   The version of x86/svr4 SDB I have at the moment does (partially)
+   seem to believe that DWARF register number 11 is associated with
+   the x86 register %st(0), but that's about all.  Higher DWARF
+   register numbers don't seem to be associated with anything in
+   particular, and even for DWARF regno 11, SDB only seems to under-
+   stand that it should say that a variable lives in %st(0) (when
+   asked via an `=' command) if we said it was in DWARF regno 11,
+   but SDB still prints garbage when asked for the value of the
+   variable in question (via a `/' command).
+   (Also note that the labels SDB prints for various FP stack regs
+   when doing an `x' command are all wrong.)
+   Note that these problems generally don't affect the native SVR4
+   C compiler because it doesn't allow the use of -O with -g and
+   because when it is *not* optimizing, it allocates a memory
+   location for each floating-point variable, and the memory
+   location is what gets described in the DWARF AT_location
+   attribute for the variable in question.
+   Regardless of the severe mental illness of the x86/svr4 SDB, we
+   do something sensible here and we use the following DWARF
+   register numbers.  Note that these are all stack-top-relative
+   numbers.
+	11 for %st(0) (gnu regno = 8)
+	12 for %st(1) (gnu regno = 9)
+	13 for %st(2) (gnu regno = 10)
+	14 for %st(3) (gnu regno = 11)
+	15 for %st(4) (gnu regno = 12)
+	16 for %st(5) (gnu regno = 13)
+	17 for %st(6) (gnu regno = 14)
+	18 for %st(7) (gnu regno = 15)
+*/
+#undef DBX_REGISTER_NUMBER
+#define DBX_REGISTER_NUMBER(n) \
+((n) == 0 ? 0 \
+ : (n) == 1 ? 2 \
+ : (n) == 2 ? 1 \
+ : (n) == 3 ? 3 \
+ : (n) == 4 ? 6 \
+ : (n) == 5 ? 7 \
+ : (n) == 6 ? 5 \
+ : (n) == 7 ? 4 \
+ : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+3 \
+ : (-1))
+
+/* Output assembler code to FILE to increment profiler label # LABELNO
+   for profiling a function entry.  */
+
+#undef FUNCTION_PROFILER
+#define FUNCTION_PROFILER(FILE, LABELNO)  \
+{									\
+  if (flag_pic)								\
+    {									\
+      fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n",		\
+	       LPREFIX, (LABELNO));					\
+      fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n");			\
+    }									\
+  else									\
+    {									\
+      fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO));	\
+      fprintf (FILE, "\tcall mcount\n");				\
+    }									\
+}
+
+#undef SIZE_TYPE
+#define SIZE_TYPE "long unsigned int"
+ 
+#undef PTRDIFF_TYPE
+#define PTRDIFF_TYPE "long int"
+  
+#undef WCHAR_TYPE
+#define WCHAR_TYPE "short unsigned int"
+   
+#undef WCHAR_UNSIGNED
+#define WCHAR_UNSIGNED 1
+
+#undef WCHAR_TYPE_SIZE
+#define WCHAR_TYPE_SIZE 16
+    
+#undef CPP_PREDEFINES
+#define CPP_PREDEFINES "-D__ELF__ -D__BEOS__ -D__INTEL__ -D_X86_=1 \
+-D__stdcall=__attribute__((__stdcall__)) \
+-D__cdecl=__attribute__((__cdecl__)) \
+-D__declspec(x)=__attribute__((x)) \
+-Asystem(beos)"
+
+#undef CPP_SPEC
+#define CPP_SPEC "%(cpp_cpu) %{!no-fPIC:%{!no-fpic:-D__PIC__ -D__pic__}}"
+
+/* BeOS uses lots of multichars, so don't warn about them unless the
+   user explicitly asks for the warnings with -Wmultichar.  Note that
+   CC1_SPEC is used for both cc1 and cc1plus. */
+
+#undef CC1_SPEC
+#define CC1_SPEC "%{!no-fpic:%{!fPIC:-fpic}} %{!Wmultichar: -Wno-multichar} %(cc1_cpu) %{profile:-p}"
+
+#undef CC1PLUS_SPEC
+#define CC1PLUS_SPEC "%{!Wctor-dtor-privacy:-Wno-ctor-dtor-privacy}"
+
+/* Provide a LINK_SPEC appropriate for BeOS.  Here we provide support
+   for the special GCC options -static and -shared, which allow us to
+   link things in one of these three modes by applying the appropriate
+   combinations of options at link-time. */
+
+/* If ELF is the default format, we should not use /lib/elf. */
+
+#undef	LINK_SPEC
+#define LINK_SPEC "%{!o*:-o %b} -m elf_i386_be -shared -Bsymbolic %{nostart:-e 0}"
+
+/* Provide start and end file specs appropriate to glibc.  */
+
+/* LIB_SPEC for BeOS */
+#undef LIB_SPEC
+#define LIB_SPEC "-lnet -lroot"
+
+/* gcc runtime lib is built into libroot.so on BeOS */
+/* ??? This is gonna be lovely when the next release of gcc has 
+   some new symbol in, so that links start failing.  */
+#undef LIBGCC_SPEC
+#define LIBGCC_SPEC ""
+
+#undef  STARTFILE_SPEC
+#define STARTFILE_SPEC "crti.o%s crtbegin.o%s %{!nostart:start_dyn.o%s}"
+
+#undef  ENDFILE_SPEC
+#define ENDFILE_SPEC "crtend.o%s crtn.o%s"
+
+/* Get perform_* macros to build libgcc.a.  */
+#include "i386/perform.h"
+
+/* A C statement (sans semicolon) to output to the stdio stream
+   FILE the assembler definition of uninitialized global DECL named
+   NAME whose size is SIZE bytes and alignment is ALIGN bytes.
+   Try to use asm_output_aligned_bss to implement this macro.  */
+
+#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
+  asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
+
+/* A C statement to output to the stdio stream FILE an assembler
+   command to advance the location counter to a multiple of 1<<LOG
+   bytes if it is within MAX_SKIP bytes.
+
+   This is used to align code labels according to Intel recommendations.  */
+
+#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
+#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
+  if ((LOG)!=0) \
+    if ((MAX_SKIP)==0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
+    else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP))
+#endif
+
+/*
+ * Support for __declspec(dllimport) & __declspec(dllexport).
+ */
+
+/* We don't care about dllimport.  */
+
+#define TARGET_NOP_FUN_DLLIMPORT 1
+
+/* A C expression whose value is nonzero if IDENTIFIER with arguments ARGS
+   is a valid machine specific attribute for DECL.
+   The attributes in ATTRIBUTES have previously been assigned to DECL.  */
+
+#undef VALID_MACHINE_DECL_ATTRIBUTE
+#define VALID_MACHINE_DECL_ATTRIBUTE(DECL, ATTRIBUTES, IDENTIFIER, ARGS) \
+  i386_pe_valid_decl_attribute_p (DECL, ATTRIBUTES, IDENTIFIER, ARGS)
+extern int i386_pe_valid_decl_attribute_p ();
+
+/* A C expression whose value is nonzero if IDENTIFIER with arguments ARGS
+   is a valid machine specific attribute for TYPE.
+   The attributes in ATTRIBUTES have previously been assigned to TYPE.  */
+
+#undef VALID_MACHINE_TYPE_ATTRIBUTE
+#define VALID_MACHINE_TYPE_ATTRIBUTE(TYPE, ATTRIBUTES, IDENTIFIER, ARGS) \
+  i386_pe_valid_type_attribute_p (TYPE, ATTRIBUTES, IDENTIFIER, ARGS)
+extern int i386_pe_valid_type_attribute_p ();
+
+#define MERGE_MACHINE_DECL_ATTRIBUTES(OLD, NEW) \
+  i386_pe_merge_decl_attributes ((OLD), (NEW))
+extern union tree_node *i386_pe_merge_decl_attributes ();
+
+/* Used to implement dllexport overriding dllimport semantics.  It's also used
+   to handle vtables - the first pass won't do anything because
+   DECL_CONTEXT (DECL) will be 0 so i386_pe_dll{ex,im}port_p will return 0.
+   It's also used to handle dllimport override semantics.  */
+#if 0
+#define REDO_SECTION_INFO_P(DECL) \
+  ((DECL_MACHINE_ATTRIBUTES (DECL) != NULL_TREE) \
+   || (TREE_CODE (DECL) == VAR_DECL && DECL_VIRTUAL_P (DECL)))
+#else
+#define REDO_SECTION_INFO_P(DECL) 1
+#endif
+
+/* Used only here locally.  If the decl has been exported, emit the 
+   necessary assembly.  */
+
+#define ASM_EXPORT_DECL(FILE, NAME, DECL)				\
+  do {									\
+    if ((DECL) && i386_pe_dllexport_p (DECL))				\
+      {									\
+	fprintf ((FILE), ".section .exports\n");			\
+	fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP);			\
+        assemble_name (FILE, NAME);					\
+	fprintf ((FILE), "\"\n.previous\n");				\
+      }									\
+  } while (0)
+
+/* Write the extra assembler code needed to declare a function properly.
+   Some svr4 assemblers 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 {									\
+    ASM_EXPORT_DECL(FILE, NAME, DECL);					\
+    fprintf (FILE, "\t%s\t ", TYPE_ASM_OP);				\
+    assemble_name (FILE, NAME);						\
+    putc (',', FILE);							\
+    fprintf (FILE, TYPE_OPERAND_FMT, "function");			\
+    putc ('\n', FILE);							\
+    ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));			\
+    ASM_OUTPUT_LABEL(FILE, NAME);					\
+  } while (0)
+
+/* Write the extra assembler code needed to declare an object properly.  */
+
+#undef ASM_DECLARE_OBJECT_NAME
+#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)			\
+  do {									\
+    ASM_EXPORT_DECL(FILE, NAME, DECL);					\
+    fprintf (FILE, "\t%s\t ", TYPE_ASM_OP);				\
+    assemble_name (FILE, NAME);						\
+    putc (',', 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);					\
+        putc (',', FILE);						\
+        fprintf (FILE, HOST_WIDE_INT_PRINT_DEC,				\
+                 int_size_in_bytes (TREE_TYPE (DECL)));			\
+        fputc ('\n', FILE);						\
+      }									\
+    ASM_OUTPUT_LABEL(FILE, NAME);					\
+  } while (0)
+
+/* Similarly for COMMON symbols.  */
+
+#undef ASM_OUTPUT_ALIGNED_COMMON
+#undef ASM_OUTPUT_ALIGNED_DECL_COMMON
+#define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN)	\
+  do {									\
+    ASM_EXPORT_DECL(FILE, NAME, DECL);					\
+    fprintf ((FILE), "\t%s\t", COMMON_ASM_OP);				\
+    assemble_name ((FILE), (NAME));					\
+    fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT);	\
+  } while (0)
+
+#undef ASM_OUTPUT_ALIGNED_LOCAL
+#undef ASM_OUTPUT_ALIGNED_DECL_LOCAL
+#define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)	     \
+  do {									     \
+    fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP);				     \
+    assemble_name ((FILE), (NAME));					     \
+    fprintf ((FILE), "\n");						     \
+    ASM_OUTPUT_ALIGNED_DECL_COMMON((FILE), (DECL), (NAME), (SIZE), (ALIGN)); \
+  } while (0)
+
+/* This macro gets just the user-specified name out of the string in a
+   SYMBOL_REF.  Discard trailing @[NUM] encoded by ENCODE_SECTION_INFO.  */
+/* Unused except to let winnt.c compile.  */
+
+#undef  STRIP_NAME_ENCODING
+#define STRIP_NAME_ENCODING(VAR,SYMBOL_NAME) ((VAR) = (SYMBOL_NAME))
+
+/* For native compiler, use standard BeOS include file search paths
+   rooted in /boot/develop/headers.  For a cross compiler, don't
+   expect the host to use the BeOS directory scheme, and instead look
+   for the BeOS include files relative to TOOL_INCLUDE_DIR.  Yes, we
+   use ANSI string concatenation here (FIXME) */
+
+#ifndef CROSS_COMPILE
+#undef INCLUDE_DEFAULTS
+#define INCLUDE_DEFAULTS \
+    { \
+    { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 },\
+    { GCC_INCLUDE_DIR, "GCC", 0, 0 },\
+    { TOOL_INCLUDE_DIR, "BINUTILS", 0, 1}, \
+    { "/boot/develop/headers/be/add-ons/graphics", 0, 0, 0 },\
+    { "/boot/develop/headers/be/devel", 0, 0, 0 },\
+    { "/boot/develop/headers/be/translation", 0, 0, 0 },\
+    { "/boot/develop/headers/be/mail", 0, 0, 0 },\
+    { "/boot/develop/headers/gnu", 0, 0, 0 },\
+    { "/boot/develop/headers/be/drivers", 0, 0, 0 },\
+    { "/boot/develop/headers/be/opengl", 0, 0, 0 },\
+    { "/boot/develop/headers/be/game", 0, 0, 0 },\
+    { "/boot/develop/headers/be/support", 0, 0, 0 },\
+    { "/boot/develop/headers/be/storage", 0, 0, 0 },\
+    { "/boot/develop/headers/be/kernel", 0, 0, 0 },\
+    { "/boot/develop/headers/be/net", 0, 0, 0 },\
+    { "/boot/develop/headers/be/midi", 0, 0, 0 },\
+    { "/boot/develop/headers/be/media", 0, 0, 0 },\
+    { "/boot/develop/headers/be/interface", 0, 0, 0 },\
+    { "/boot/develop/headers/be/device", 0, 0, 0 },\
+    { "/boot/develop/headers/be/app", 0, 0, 0 },\
+    { "/boot/develop/headers/cpp", 0, 0, 0 },\
+    { "/boot/develop/headers/posix", 0, 0, 0 },\
+    { "/boot/develop/headers/be/precompiled", 0, 0, 0 },\
+    { "/boot/develop/headers/be", 0, 0, 0 },\
+    { "/boot/develop/headers", 0, 0, 0 }, \
+    { 0, 0, 0, 0 } \
+    };
+#else /* CROSS_COMPILE */
+#undef	INCLUDE_DEFAULTS
+#define INCLUDE_DEFAULTS				\
+    { \
+    { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 },\
+    { GCC_INCLUDE_DIR, "GCC", 0, 0 },\
+    { TOOL_INCLUDE_DIR, "BINUTILS", 0, 1}, \
+    { CROSS_INCLUDE_DIR "/be/add-ons/graphics", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/devel", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/translation", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/mail", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/gnu", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/drivers", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/opengl", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/game", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/support", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/storage", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/kernel", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/net", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/midi", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/media", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/interface", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/device", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/app", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/cpp", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/posix", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be/precompiled", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR "/be", 0, 0, 0 },\
+    { CROSS_INCLUDE_DIR , 0, 0, 0 }, \
+    { 0, 0, 0, 0 } \
+    };
+#endif
+
+/* Whee.  LIBRARY_PATH is Be's LD_LIBRARY_PATH, which of course will
+   cause nasty problems if we override it.  */
+#define LIBRARY_PATH_ENV        "BELIBRARIES"
+
+/* BeOS doesn't have a separate math library.  */
+#define MATH_LIBRARY ""
+
+/* BeOS headers are C++-aware (and often use C++).  */
+#define NO_IMPLICIT_EXTERN_C
+
+/* Define this macro if in some cases global symbols from one translation
+   unit may not be bound to undefined symbols in another translation unit
+   without user intervention.  For instance, under Microsoft Windows
+   symbols must be explicitly imported from shared libraries (DLLs).  */
+#define MULTIPLE_SYMBOL_SPACES
diff --git a/gcc/config/i386/beos-pe.h b/gcc/config/i386/beos-pe.h
new file mode 100644
index 00000000000..52af628eb81
--- /dev/null
+++ b/gcc/config/i386/beos-pe.h
@@ -0,0 +1,118 @@
+/* Operating system specific defines for BeOS target.
+   Copyright (C) 1995-99, 2000 Free Software Foundation, Inc.
+   Contributed by Fred Fish (fnf@cygnus.com), based on cygwin32.h.
+
+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. */
+
+
+/* Get all the PE support related things.  */
+#include "cygwin32.h"
+
+/* Change debugging to Dwarf2.  */
+#undef SDB_DEBUGGING_INFO
+#undef DBX_DEBUGGING_INFO
+#define DWARF2_DEBUGGING_INFO
+#undef PREFERRED_DEBUGGING_TYPE
+#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
+
+/* Support the __declspec keyword by turning them into attributes.
+   We currently only support: dllimport and dllexport.
+   Note that the current way we do this may result in a collision with
+   predefined attributes later on.  This can be solved by using one attribute,
+   say __declspec__, and passing args to it.  The problem with that approach
+   is that args are not accumulated: each new appearance would clobber any
+   existing args.  */
+
+#undef CPP_PREDEFINES
+#define CPP_PREDEFINES "-D__BEOS__ -D__INTEL__ -Di386 -D_X86_=1 \
+-D__stdcall=__attribute__((__stdcall__)) \
+-D__cdecl=__attribute__((__cdecl__)) \
+-D__declspec(x)=__attribute__((x)) \
+-Asystem(beos) -Acpu(i386) -Amachine(i386)"
+
+#undef CPP_SPEC
+#define CPP_SPEC "-remap %(cpp_cpu) %{posix:-D_POSIX_SOURCE}"
+
+#undef LIB_SPEC
+#define LIB_SPEC "-lroot -lbe -ltracker -lmedia -lnet -lnetdev -ldevice -lmidi -lgame -latalk -lmail"
+
+#undef STARTFILE_SPEC
+#define STARTFILE_SPEC "/boot/develop/lib/x86/start_dyn.o /boot/develop/lib/x86/init_term_dyn.o /boot/develop/lib/x86/glue-noinit.a"
+
+/* Temporary. */
+#define LINKERSCRIPT_SPEC "%{!T:-Tbeos.ld}"
+
+/* No math library. */
+#define MATH_LIBRARY ""
+
+/* Don't ignore dllimport for functions.  */
+#undef TARGET_NOP_FUN_DLLIMPORT
+#define TARGET_NOP_FUN_DLLIMPORT 0
+
+#undef SUBTARGET_SWITCHES
+#define SUBTARGET_SWITCHES
+
+/* Disable DWARF2 unwind info; this doesn't appear to work on
+   COFF-based targets right now. (I want to say "duh?" but someone
+   will correct me later. */
+
+#undef INCOMING_RETURN_ADDR_RTX
+#undef DWARF2_UNWIND_INFO
+
+/* In the current BeOS release (DR9), use of gcc's builtin alloca is a
+   problem because of the relatively low default stack size of 256K with no
+   way to expand it.  So anything we compile for the BeOS target should not
+   use the builtin alloca.  Defining SMALL_STACK disables builtin alloca.  */
+
+#define SMALL_STACK
+
+/* Yuck. */
+#ifndef CROSS_COMPILE
+#undef INCLUDE_DEFAULTS
+#define INCLUDE_DEFAULTS \
+    { \
+    { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 },\
+    { GCC_INCLUDE_DIR, "GCC", 0, 0 },\
+    { TOOL_INCLUDE_DIR, "BINUTILS", 0, 1}, \
+    { "/boot/develop/headers/be/add-ons/graphics", 0, 0, 0 },\
+    { "/boot/develop/headers/be/translation", 0, 0, 0 },\
+    { "/boot/develop/headers/be/mail", 0, 0, 0 },\
+    { "/boot/develop/headers/gnu", 0, 0, 0 },\
+    { "/boot/develop/headers/be/drivers", 0, 0, 0 },\
+    { "/boot/develop/headers/be/game", 0, 0, 0 },\
+    { "/boot/develop/headers/be/support", 0, 0, 0 },\
+    { "/boot/develop/headers/be/storage", 0, 0, 0 },\
+    { "/boot/develop/headers/be/kernel", 0, 0, 0 },\
+    { "/boot/develop/headers/be/net", 0, 0, 0 },\
+    { "/boot/develop/headers/be/midi", 0, 0, 0 },\
+    { "/boot/develop/headers/be/media", 0, 0, 0 },\
+    { "/boot/develop/headers/be/interface", 0, 0, 0 },\
+    { "/boot/develop/headers/be/device", 0, 0, 0 },\
+    { "/boot/develop/headers/be/app", 0, 0, 0 },\
+    { "/boot/develop/headers/cpp", 0, 0, 0 },\
+    { "/boot/develop/headers/posix", 0, 0, 0 },\
+    { "/boot/develop/headers/be/precompiled", 0, 0, 0 },\
+    { "/boot/develop/headers/be", 0, 0, 0 },\
+    { "/boot/develop/headers", 0, 0, 0 }, \
+    { 0, 0, 0, 0 } \
+    };
+#endif
+
+/* Whee.  LIBRARY_PATH is Be's LD_LIBRARY_PATH, which of course will
+   cause nasty problems if we override it.  */
+#define LIBRARY_PATH_ENV	"BELIBRARIES"
diff --git a/gcc/config/i386/t-beos b/gcc/config/i386/t-beos
new file mode 100644
index 00000000000..5d73a2361c2
--- /dev/null
+++ b/gcc/config/i386/t-beos
@@ -0,0 +1,14 @@
+# Do not build libgcc1.
+LIBGCC1 =
+CROSS_LIBGCC1 =
+
+# There are system headers elsewhere, but these are the ones that
+# we are most likely to want to apply any fixes to.
+SYSTEM_HEADER_DIR = /boot/develop/headers/posix
+CROSS_SYSTEM_HEADER_DIR = $(tooldir)/sys-include/posix
+
+# Use the system assert.h
+INSTALL_ASSERT_H =
+
+winnt.o: $(srcdir)/config/i386/winnt.c
+	$(CC) -c $(ALL_CFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) $(srcdir)/config/i386/winnt.c
diff --git a/gcc/config/i386/x-beos b/gcc/config/i386/x-beos
new file mode 100644
index 00000000000..37b8ccac9cf
--- /dev/null
+++ b/gcc/config/i386/x-beos
@@ -0,0 +1,9 @@
+# configuration for BeOS
+INSTALL=install -c
+
+# Show we need to use the C version of ALLOCA
+ALLOCA=alloca.o
+# Use it regardless of whether we are compiling with gcc or not.
+USE_ALLOCA= `echo "${ALLOCA}"`
+USE_HOST_ALLOCA= `echo ${HOST_PREFIX}${HOST_ALLOCA}`
+SUBDIR_USE_ALLOCA = `if [ x$(ALLOCA) != x ]; then echo ../$(ALLOCA); else true; fi`
diff --git a/gcc/config/i386/xm-beos.h b/gcc/config/i386/xm-beos.h
new file mode 100644
index 00000000000..e190ba1b569
--- /dev/null
+++ b/gcc/config/i386/xm-beos.h
@@ -0,0 +1,64 @@
+/* Configuration for GNU C-compiler for BeOS host.
+   Copyright (C) 1997-99, 2000 Free Software Foundation, Inc.
+   Contributed by Fred Fish (fnf@cygnus.com), based on xm-rs6000.h
+   by Richard Kenner (kenner@vlsi1.ultra.nyu.edu).
+
+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.  */
+
+#include <i386/xm-i386.h>
+
+/* Arguments to use with `exit'.  */
+
+#define	SUCCESS_EXIT_CODE	0
+#define	FATAL_EXIT_CODE		33
+
+/* Include <sys/wait.h> to define the exit status access macros.  */
+#ifndef inhibit_libc
+#include <sys/wait.h>
+#endif
+
+#define	ONLY_INT_FIELDS
+
+/* use ANSI/SYSV style byte manipulation routines instead of BSD ones */
+
+#undef bcopy
+#define bcopy(s,d,n)	memmove((d),(s),(n))
+#undef bzero
+#define bzero(d,n)	memset((d),0,(n))
+#undef bcmp
+#define bcmp(l,r,n)	memcmp((l),(r),(n))
+#undef index
+#define index		strchr
+#undef rindex
+#define rindex		strrchr
+
+/* BeOS is closer to USG than BSD */
+
+#define USG
+
+/* Define various things that the BeOS host has. */
+
+#ifndef HAVE_VPRINTF
+#define HAVE_VPRINTF
+#endif
+#ifndef HAVE_PUTENV
+#define HAVE_PUTENV
+#endif
+#define HAVE_RENAME
+
+#define STDC_HEADERS 1
diff --git a/gcc/configure.in b/gcc/configure.in
index bf499fc53c7..4dbcf86f627 100644
--- a/gcc/configure.in
+++ b/gcc/configure.in
@@ -409,7 +409,7 @@ AC_FUNC_MMAP
 
 GCC_NEED_DECLARATIONS(bcopy bzero bcmp \
 	index rindex getenv atol sbrk abort atof strerror getcwd getwd \
-	strsignal putc_unlocked fputs_unlocked strstr)
+	strsignal putc_unlocked fputs_unlocked strstr environ)
 
 GCC_NEED_DECLARATIONS(malloc realloc calloc free, [
 #ifdef HAVE_MALLOC_H
@@ -1277,6 +1277,27 @@ changequote([,])dnl
 		tmake_file=i386/t-i386bare
 		;;
 changequote(,)dnl
+	i[34567]86-*-beospe*)
+changequote([,])dnl
+		xm_file=i386/xm-beos.h
+		xm_defines="USE_C_ALLOCA"
+		tmake_file=i386/t-beos
+		tm_file=i386/beos-pe.h
+		xmake_file=i386/x-beos
+		extra_objs=winnt.o
+		;;
+changequote(,)dnl
+	i[34567]86-*-beoself* | i[34567]86-*-beos*)
+changequote([,])dnl
+		xm_file=i386/xm-beos.h
+		tmake_file='i386/t-beos i386/t-crtpic'
+		tm_file=i386/beos-elf.h
+		xmake_file=i386/x-beos
+		extra_objs=winnt.o
+		extra_parts='crtbegin.o crtend.o'
+		fixincludes=Makefile.in
+		;;
+changequote(,)dnl
 	i[34567]86-*-bsdi* | i[34567]86-*-bsd386*)
 changequote([,])dnl
 		tm_file=i386/bsd386.h
diff --git a/gcc/cross-make b/gcc/cross-make
index 84be67fd605..fef123c40cd 100644
--- a/gcc/cross-make
+++ b/gcc/cross-make
@@ -5,7 +5,7 @@ LIBGCC1 = $(CROSS_LIBGCC1)
 
 # Dir to search for system headers.  Normally /usr/include.
 # Use CROSS_INCLUDE_DIR not TOOL_INCLUDE_DIR for other vendor's headers.
-SYSTEM_HEADER_DIR = $(tooldir)/sys-include
+SYSTEM_HEADER_DIR = $(CROSS_SYSTEM_HEADER_DIR)
 
 # Don't try to compile the things we can't compile.
 ALL = all.cross
diff --git a/gcc/gcc.c b/gcc/gcc.c
index b65d6e8cc02..8f81369d178 100644
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -82,6 +82,11 @@ static char dir_separator_str[] = {DIR_SEPARATOR, 0};
 #define GET_ENV_PATH_LIST(VAR,NAME)	do { (VAR) = getenv (NAME); } while (0)
 #endif
 
+/* Most every one is fine with LIBRARY_PATH.  For some, it conflicts.  */
+#ifndef LIBRARY_PATH_ENV
+#define LIBRARY_PATH_ENV "LIBRARY_PATH"
+#endif
+
 #ifndef HAVE_KILL
 #define kill(p,s) raise(s)
 #endif
@@ -240,6 +245,7 @@ static int execute			PROTO ((void));
 static void unused_prefix_warnings	PROTO ((struct path_prefix *));
 static void clear_args			PROTO ((void));
 static void fatal_error			PROTO ((int));
+static void set_input			PROTO ((const char *));
 
 /* Specs are strings containing lines, each of which (if not blank)
 is made up of a program name, and arguments separated by spaces.
@@ -1892,6 +1898,7 @@ build_search_list (paths, prefix, check_dir_p)
   struct prefix_list *pprefix;
 
   obstack_grow (&collect_obstack, prefix, strlen (prefix));
+  obstack_1grow (&collect_obstack, '=');
 
   for (pprefix = paths->plist; pprefix != 0; pprefix = pprefix->next)
     {
@@ -2941,7 +2948,7 @@ process_command (argc, argv)
 	}
     }
 
-  GET_ENV_PATH_LIST (temp, "LIBRARY_PATH");
+  GET_ENV_PATH_LIST (temp, LIBRARY_PATH_ENV);
   if (temp && *cross_compile == '0')
     {
       const char *startp, *endp;
@@ -4935,6 +4942,37 @@ is_directory (path1, path2, linker)
 
   return (stat (path, &st) >= 0 && S_ISDIR (st.st_mode));
 }
+
+/* Set up the various global variables to indicate that we're processing
+   the input file named FILENAME.  */
+
+static void
+set_input (filename)
+     const char *filename;
+{
+  register const char *p;
+
+  input_filename = filename;
+  input_filename_length = strlen (input_filename);
+  
+  input_basename = input_filename;
+  for (p = input_filename; *p; p++)
+    if (IS_DIR_SEPARATOR (*p))
+      input_basename = p + 1;
+
+  /* Find a suffix starting with the last period,
+     and set basename_length to exclude that suffix.  */
+  basename_length = strlen (input_basename);
+  p = input_basename + basename_length;
+  while (p != input_basename && *p != '.') --p;
+  if (*p == '.' && p != input_basename)
+    {
+      basename_length = p - input_basename;
+      input_suffix = p + 1;
+    }
+  else
+    input_suffix = "";
+}
 
 /* On fatal signals, delete all the temporary files.  */
 
@@ -5335,9 +5373,8 @@ main (argc, argv)
 
       /* Tell do_spec what to substitute for %i.  */
 
-      input_filename = infiles[i].name;
-      input_filename_length = strlen (input_filename);
       input_file_number = i;
+      set_input (infiles[i].name);
 
       /* Use the same thing in %o, unless cp->spec says otherwise.  */
 
@@ -5352,31 +5389,12 @@ main (argc, argv)
 	{
 	  /* Ok, we found an applicable compiler.  Run its spec.  */
 	  /* First say how much of input_filename to substitute for %b  */
-	  register const char *p;
 	  int len;
 
 	  if (cp->spec[0][0] == '#')
 	    error ("%s: %s compiler not installed on this system",
 		   input_filename, &cp->spec[0][1]);
 
-	  input_basename = input_filename;
-	  for (p = input_filename; *p; p++)
-	    if (IS_DIR_SEPARATOR (*p))
-	      input_basename = p + 1;
-
-	  /* Find a suffix starting with the last period,
-	     and set basename_length to exclude that suffix.  */
-	  basename_length = strlen (input_basename);
-	  p = input_basename + basename_length;
-	  while (p != input_basename && *p != '.') --p;
-	  if (*p == '.' && p != input_basename)
-	    {
-	      basename_length = p - input_basename;
-	      input_suffix = p + 1;
-	    }
-	  else
-	    input_suffix = "";
-
 	  len = 0;
 	  for (j = 0; j < sizeof cp->spec / sizeof cp->spec[0]; j++)
 	    if (cp->spec[j])
@@ -5418,6 +5436,12 @@ main (argc, argv)
       clear_failure_queue ();
     }
 
+  /* Reset the output file name to the first input file name, for use
+     with %b in LINK_SPEC on a target that prefers not to emit a.out
+     by default.  */
+  if (n_infiles > 0)
+    set_input (infiles[0].name);
+
   if (error_count == 0)
     {
       /* Make sure INPUT_FILE_NUMBER points to first available open
@@ -5442,8 +5466,8 @@ main (argc, argv)
 	}
       /* Rebuild the COMPILER_PATH and LIBRARY_PATH environment variables
 	 for collect.  */
-      putenv_from_prefixes (&exec_prefixes, "COMPILER_PATH=");
-      putenv_from_prefixes (&startfile_prefixes, "LIBRARY_PATH=");
+      putenv_from_prefixes (&exec_prefixes, "COMPILER_PATH");
+      putenv_from_prefixes (&startfile_prefixes, LIBRARY_PATH_ENV);
 
       value = do_spec (link_command_spec);
       if (value < 0)
diff --git a/gcc/ginclude/stdarg.h b/gcc/ginclude/stdarg.h
index 2464599c1b5..3337065a06c 100644
--- a/gcc/ginclude/stdarg.h
+++ b/gcc/ginclude/stdarg.h
@@ -105,7 +105,10 @@ typedef __gnuc_va_list va_list;
 #ifndef _VA_LIST
 /* The macro _VA_LIST_T_H is used in the Bull dpx2  */
 #ifndef _VA_LIST_T_H
+/* The macro __va_list__ is used by BeOS.  */
+#ifndef __va_list__
 typedef __gnuc_va_list va_list;
+#endif /* not __va_list__ */
 #endif /* not _VA_LIST_T_H */
 #endif /* not _VA_LIST */
 #endif /* not _VA_LIST_DEFINED */
@@ -121,6 +124,9 @@ typedef __gnuc_va_list va_list;
 #ifndef _VA_LIST_T_H
 #define _VA_LIST_T_H
 #endif
+#ifndef __va_list__
+#define __va_list__
+#endif
 
 #endif /* not _VA_LIST_, except on certain systems */
 
diff --git a/gcc/ginclude/stddef.h b/gcc/ginclude/stddef.h
index 0004ec77407..ae1037fd09d 100644
--- a/gcc/ginclude/stddef.h
+++ b/gcc/ginclude/stddef.h
@@ -274,12 +274,8 @@ typedef _BSD_RUNE_T_ rune_t;
 #endif
 
 #ifndef __WCHAR_TYPE__
-#ifdef __BEOS__
-#define __WCHAR_TYPE__ unsigned char
-#else
 #define __WCHAR_TYPE__ int
 #endif
-#endif
 #ifndef __cplusplus
 typedef __WCHAR_TYPE__ wchar_t;
 #endif
diff --git a/gcc/ginclude/varargs.h b/gcc/ginclude/varargs.h
index 6c70f7a0440..210b9674743 100644
--- a/gcc/ginclude/varargs.h
+++ b/gcc/ginclude/varargs.h
@@ -108,7 +108,10 @@ typedef __gnuc_va_list va_list;
 #ifndef _VA_LIST
 /* The macro _VA_LIST_T_H is used in the Bull dpx2  */
 #ifndef _VA_LIST_T_H
+/* The macro __va_list__ is used by BeOS.  */
+#ifndef __va_list__
 typedef __gnuc_va_list va_list;
+#endif /* not __va_list__ */
 #endif /* not _VA_LIST_T_H */
 #endif /* not _VA_LIST */
 #endif /* not _VA_LIST_DEFINED */
@@ -124,6 +127,9 @@ typedef __gnuc_va_list va_list;
 #ifndef _VA_LIST_T_H
 #define _VA_LIST_T_H
 #endif
+#ifndef __va_list__
+#define __va_list__
+#endif
 
 #endif /* not _VA_LIST_, except on certain systems */
 
diff --git a/gcc/hash.h b/gcc/hash.h
index ac3b1ede570..b42502b8108 100644
--- a/gcc/hash.h
+++ b/gcc/hash.h
@@ -25,6 +25,10 @@ Boston, MA 02111-1307, USA.  */
 
 #include "obstack.h"
 
+#undef false
+#undef true
+#undef boolean
+
 typedef enum {false, true} boolean;
 
 typedef PTR hash_table_key;
diff --git a/gcc/system.h b/gcc/system.h
index 431b32fa2ca..5d31b45f2ac 100644
--- a/gcc/system.h
+++ b/gcc/system.h
@@ -176,6 +176,11 @@ extern int errno;
 
 #ifdef HAVE_STDLIB_H
 # include <stdlib.h>
+# ifdef USE_C_ALLOCA
+/* Note that systems that use glibc have a <stdlib.h> that includes
+   <alloca.h> that defines alloca, so let USE_C_ALLOCA override this. */
+# undef alloca
+#endif
 #endif
 
 #ifdef HAVE_UNISTD_H
diff --git a/gcc/tm.texi b/gcc/tm.texi
index b2d43c954ac..385a0dcb940 100644
--- a/gcc/tm.texi
+++ b/gcc/tm.texi
@@ -461,7 +461,7 @@ The environment variable @code{GCC_EXEC_PREFIX}, if any.
 
 @item
 The directories specified by the environment variable @code{LIBRARY_PATH}
-(native only, cross compilers do not use this).
+(or port-specific name; native only, cross compilers do not use this).
 
 @item
 The macro @code{STANDARD_EXEC_PREFIX}.
@@ -2281,6 +2281,12 @@ during virtual register instantiation.
 
 You only need to define this macro if you want to support call frame
 debugging information like that provided by DWARF 2.
+
+@findex SMALL_STACK
+@item SMALL_STACK
+Define this macro if the stack size for the target is very small.  This
+has the effect of disabling gcc's builtin @samp{alloca}, though
+@samp{__builtin_alloca} is not affected.
 @end table
 
 @node Stack Checking
@@ -7784,4 +7790,12 @@ in the system math library, or @samp{""} if the target does not have a
 separate math library.
 
 You need only define this macro if the default of @samp{"-lm"} is wrong.
+
+@findex LIBRARY_PATH_ENV
+@item LIBRARY_PATH_ENV
+Define this macro as a C string constant for the environment variable that
+specifies where the linker should look for libraries.
+
+You need only define this macro if the default of @samp{"LIBRARY_PATH"}
+is wrong.
 @end table
diff --git a/gcc/toplev.c b/gcc/toplev.c
index 4ddfc04bdad..9c4a184a79c 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -138,7 +138,7 @@ You Lose!  You must define PREFERRED_DEBUGGING_TYPE!
 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 #endif
 
-#if ! (defined (VMS) || defined (OS2))
+#ifdef NEED_DECLARATION_ENVIRON
 extern char **environ;
 #endif
 extern char *version_string;