* gbl-ctors.h: Lose HAVE_ATEXIT. Don't define ON_EXIT.

	* libgcc2.c: Lose obsolete defn of WEAK_ALIAS.
	(__bb_init_func, __bb_init_prg): Use atexit instead of ON_EXIT.
	(__do_global_dtors): Likewise.  Don't mess with _exit_dummy_decl.
	(atexit, exit): Simplify.
	* tm.texi: Document NEED_ATEXIT and ON_EXIT.  Remove HAVE_ATEXIT.
	* config/lots: Remove defns of HAVE_ATEXIT.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@29439 138bc75d-0d04-0410-961f-82ee72b054a4

10 files changed, 13 insertions, 52 deletions

diff --git a/gcc/config/arm/coff.h b/gcc/config/arm/coff.h
index 87f969eddeb..8d8f5605b65 100644
--- a/gcc/config/arm/coff.h
+++ b/gcc/config/arm/coff.h
@@ -1,6 +1,6 @@
 /* Definitions of target machine for GNU compiler,
    for ARM with COFF obj format.
-   Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
+   Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
    Contributed by Doug Evans (dje@cygnus.com).
    
 This file is part of GNU CC.
@@ -208,14 +208,6 @@ dtors_section ()							\
 #undef DO_GLOBAL_CTORS_BODY
 #undef DO_GLOBAL_DTORS_BODY
 
-/* If you don't define HAVE_ATEXIT, and the object file format/OS/whatever 
-   does not support constructors/destructors, then gcc implements destructors
-   by defining its own exit function, which calls the destructors.  This gcc
-   exit function overrides the C library's exit function, and this can cause
-   all kinds of havoc if the C library has a non-trivial exit function.  You
-   really don't want to use the exit function in libgcc2.c.  */
-#define HAVE_ATEXIT
-
 /* The ARM development system defines __main.  */
 #define NAME__MAIN  "__gccmain"
 #define SYMBOL__MAIN __gccmain
diff --git a/gcc/config/arm/linux-elf.h b/gcc/config/arm/linux-elf.h
index f7bd3b29fa2..39054902ba3 100644
--- a/gcc/config/arm/linux-elf.h
+++ b/gcc/config/arm/linux-elf.h
@@ -25,9 +25,6 @@ Boston, MA 02111-1307, USA.  */
 /* Do not assume anything about header files.  */
 #define NO_IMPLICIT_EXTERN_C
 
-/* We have libgcc2.  */
-#define HAVE_ATEXIT
-
 #ifndef SUBTARGET_DEFAULT_APCS26
 /* Default is to use APCS-32 mode.  */
 # define TARGET_DEFAULT (ARM_FLAG_APCS_32 | ARM_FLAG_SHORT_BYTE)
diff --git a/gcc/config/arm/linux-telf.h b/gcc/config/arm/linux-telf.h
index b6aca0b57b4..8be385295c3 100644
--- a/gcc/config/arm/linux-telf.h
+++ b/gcc/config/arm/linux-telf.h
@@ -19,9 +19,6 @@ along with this program; see the file COPYING.  If not, write to
 the Free Software Foundation, 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.  */
 
-/* We have libgcc2.  */
-#define HAVE_ATEXIT
-
 #define SUBTARGET_EXTRA_ASM_SPEC	\
 	" %{fPIC:-k} %{fpic:-k}"
 
diff --git a/gcc/config/arm/riscix.h b/gcc/config/arm/riscix.h
index fad0293337a..37bd1fe313c 100644
--- a/gcc/config/arm/riscix.h
+++ b/gcc/config/arm/riscix.h
@@ -1,5 +1,5 @@
 /* Definitions of target machine for GNU compiler.  ARM RISCiX version.
-   Copyright (C) 1993, 1994, 1995, 1997 Free Software Foundation, Inc.
+   Copyright (C) 1993, 1994, 1995, 1997, 1999 Free Software Foundation, Inc.
    Contributed by Richard Earnshaw (rwe11@cl.cam.ac.uk), based on original
 	      work by Pieter `Tiggr' Schoenmakers (rcpieter@win.tue.nl)
    	      and Martin Simmons (@harleqn.co.uk).
@@ -95,12 +95,6 @@ Boston, MA 02111-1307, USA.  */
 /* Unsigned chars produces much better code than signed.  */
 #define DEFAULT_SIGNED_CHAR  0
 
-/* Define this if the target system supports the function atexit from the
-   ANSI C standard.  If this is not defined, and INIT_SECTION_ASM_OP is not
-   defined, a default exit function will be provided to support C++.  
-   The man page only describes on_exit, but atexit is also there.  */
-#define HAVE_ATEXIT 1
-
 /* Some systems use __main in a way incompatible with its use in gcc, in these
    cases use the macros NAME__MAIN to give a quoted symbol and SYMBOL__MAIN to
    give the same symbol without quotes for an alternative entry point.  You
diff --git a/gcc/config/arm/riscix1-1.h b/gcc/config/arm/riscix1-1.h
index e896a1eb033..568df54e828 100644
--- a/gcc/config/arm/riscix1-1.h
+++ b/gcc/config/arm/riscix1-1.h
@@ -1,5 +1,5 @@
 /* Definitions of target machine for GNU compiler.  ARM RISCiX 1.1x version.
-   Copyright (C) 1993, 1995, 1997 Free Software Foundation, Inc.
+   Copyright (C) 1993, 1995, 1997, 1999 Free Software Foundation, Inc.
    Contributed by Richard Earnshaw (rwe11@cl.cam.ac.uk), based on original
 	      work by Pieter `Tiggr' Schoenmakers (rcpieter@win.tue.nl)
    	      and Martin Simmons (@harleqn.co.uk).
@@ -62,12 +62,15 @@ Boston, MA 02111-1307, USA.  */
 #define DEFAULT_SIGNED_CHAR  1
 #endif
 
-/* Define this if the target system supports the function atexit form the
-   ANSI C standard.  If this is not defined, and INIT_SECTION_ASM_OP is not
+/* Define this if the target system lacks the function atexit from the
+   ANSI C standard.  If this is defined, and ON_EXIT is not
    defined, a default exit function will be provided to support C++.  
    The man page only describes on_exit, but atexit is also there.  
-   This seems to be missing in early versions. */
-/*#define HAVE_ATEXIT 1 */
+   This seems to be missing in early versions.
+
+   FIXME Should we define ON_EXIT here?  */
+#define NEED_ATEXIT
+
 /* Some systems use __main in a way incompatible with its use in gcc, in these
    cases use the macros NAME__MAIN to give a quoted symbol and SYMBOL__MAIN to
    give the same symbol without quotes for an alternative entry point.  You
diff --git a/gcc/config/arm/tcoff.h b/gcc/config/arm/tcoff.h
index ece0ea4d045..5f14c1e3283 100644
--- a/gcc/config/arm/tcoff.h
+++ b/gcc/config/arm/tcoff.h
@@ -1,6 +1,6 @@
 /* Definitions of target machine for GNU compiler,
    for Thumb with COFF obj format.
-   Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+   Copyright (C) 1995, 1996, 1999 Free Software Foundation, Inc.
    Derived from arm/coff.h originally by Doug Evans (dje@cygnus.com).
    
 This file is part of GNU CC.
@@ -183,10 +183,6 @@ do {						\
 #undef DO_GLOBAL_CTORS_BODY
 #undef DO_GLOBAL_DTORS_BODY
 
-/* The ARM development system has atexit and doesn't have _exit,
-   so define this for now.  */
-#define HAVE_ATEXIT
-
 /* The ARM development system defines __main.  */
 #define NAME__MAIN "__gccmain"
 #define SYMBOL__MAIN __gccmain
diff --git a/gcc/config/arm/telf.h b/gcc/config/arm/telf.h
index 14527ceef42..1f7bbb7c3b6 100644
--- a/gcc/config/arm/telf.h
+++ b/gcc/config/arm/telf.h
@@ -299,10 +299,6 @@ dtors_section ()						\
     }						\
   while (0)
 
-/* The ARM development system has atexit and doesn't have _exit,
-   so define this for now.  */
-#define HAVE_ATEXIT
-
 /* The ARM development system defines __main.  */
 #define NAME__MAIN "__gccmain"
 #define SYMBOL__MAIN __gccmain
diff --git a/gcc/config/arm/thumb.h b/gcc/config/arm/thumb.h
index 65d6d4ba9cc..9c30a30d639 100644
--- a/gcc/config/arm/thumb.h
+++ b/gcc/config/arm/thumb.h
@@ -1,5 +1,5 @@
 /* Definitions of target machine for GNU compiler, for ARM/Thumb.
-   Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
+   Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
    The basis of this contribution was generated by
    		Richard Earnshaw, Advanced RISC Machines Ltd
 
@@ -1277,8 +1277,6 @@ extern int making_const_table;
 
 #define NO_DOLLAR_IN_LABEL 1
 
-#define HAVE_ATEXIT
-
 /* The literal pool needs to reside in the text area due to the
    limited PC addressing range: */
 #define MACHINE_DEPENDENT_REORG(INSN) thumb_reorg ((INSN))
diff --git a/gcc/config/arm/tpe.h b/gcc/config/arm/tpe.h
index 50e33a078bf..4432105568b 100644
--- a/gcc/config/arm/tpe.h
+++ b/gcc/config/arm/tpe.h
@@ -214,10 +214,6 @@ do {						\
 #undef DO_GLOBAL_CTORS_BODY
 #undef DO_GLOBAL_DTORS_BODY
 
-/* The ARM development system has atexit and doesn't have _exit,
-   so define this for now.  */
-#define HAVE_ATEXIT
-
 /* The ARM development system defines __main.  */
 #define NAME__MAIN "__gccmain"
 #define SYMBOL__MAIN __gccmain
diff --git a/gcc/config/arm/unknown-elf.h b/gcc/config/arm/unknown-elf.h
index 6402c4e697f..9e3389050a9 100644
--- a/gcc/config/arm/unknown-elf.h
+++ b/gcc/config/arm/unknown-elf.h
@@ -1,5 +1,5 @@
 /* Definitions for non-Linux based ARM systems using ELF
-   Copyright (C) 1998 Free Software Foundation, Inc.
+   Copyright (C) 1998, 1999 Free Software Foundation, Inc.
    Contributed by Catherine Moore <clm@cygnus.com>
 
 This file is part of GNU CC.
@@ -24,14 +24,6 @@ Boston, MA 02111-1307, USA.  */
 #define TARGET_VERSION	fputs (" (ARM/ELF non-Linux)", stderr);
 #endif
 
-/* If you don't define HAVE_ATEXIT, and the object file format/OS/whatever 
-   does not support constructors/destructors, then gcc implements destructors
-   by defining its own exit function, which calls the destructors.  This gcc
-   exit function overrides the C library's exit function, and this can cause
-   all kinds of havoc if the C library has a non-trivial exit function.  You
-   really don't want to use the exit function in libgcc2.c.  */
-#define HAVE_ATEXIT
-
 /* Default to using APCS-32 and software floating point.  */
 #ifndef TARGET_DEFAULT
 #define TARGET_DEFAULT	(ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32)