Remove NO_CTORS_DTORS_SECTIONS macro

This was originally added to support binutils older than version
2.22:

  <https://sourceware.org/ml/libc-alpha/2010-12/msg00051.html>

Since 2.22 is older than the minimum required binutils version
for building glibc, we no longer need this.  (The changes do
not impact the statically linked startup code.)

10 files changed, 3 insertions, 158 deletions

diff --git a/Makerules b/Makerules
index 1e9c18f..341db86 100644
--- a/Makerules
+++ b/Makerules
@@ -690,8 +690,7 @@ $(common-objpfx)linkobj/libc.so: link-libc-deps = # empty
 
 # Use our own special initializer and finalizer files for the libc.so
 # libraries.
-$(common-objpfx)libc.so: $(elf-objpfx)soinit.os \
-			 $(common-objpfx)libc_pic.os$(libc_pic_clean) \
+$(common-objpfx)libc.so: $(common-objpfx)libc_pic.os$(libc_pic_clean) \
 			 $(elf-objpfx)sofini.os \
 			 $(elf-objpfx)interp.os \
 			 $(elf-objpfx)ld.so \
@@ -699,8 +698,7 @@ $(common-objpfx)libc.so: $(elf-objpfx)soinit.os \
 	$(build-shlib)
 	$(call after-link,$@)
 
-$(common-objpfx)linkobj/libc.so: $(elf-objpfx)soinit.os \
-			 $(common-objpfx)linkobj/libc_pic.a \
+$(common-objpfx)linkobj/libc.so: $(common-objpfx)linkobj/libc_pic.a \
 			 $(elf-objpfx)sofini.os \
 			 $(elf-objpfx)interp.os \
 			 $(elf-objpfx)ld.so \
diff --git a/config.h.in b/config.h.in
index dea43df..cd7d4df 100644
--- a/config.h.in
+++ b/config.h.in
@@ -157,9 +157,6 @@
 /* Define if multi-arch DSOs should be generated.  */
 #undef USE_MULTIARCH
 
-/* Define if `.ctors' and `.dtors' sections shouldn't be used.  */
-#undef	NO_CTORS_DTORS_SECTIONS
-
 /* Define if obsolete RPC code should be made available for user-level code
    to link against.  */
 #undef LINK_OBSOLETE_RPC
diff --git a/configure b/configure
index 8df47d6..b8ef8c7 100755
--- a/configure
+++ b/configure
@@ -5753,59 +5753,6 @@ if test $libc_cv_have_sdata_section = yes; then
 
 fi
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to use .ctors/.dtors header and trailer" >&5
-$as_echo_n "checking whether to use .ctors/.dtors header and trailer... " >&6; }
-if ${libc_cv_ctors_header+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-    libc_cv_ctors_header=yes
-  cat > conftest.c <<EOF
-int _start (void) { return 0; }
-int __start (void) { return 0; }
-
-__attribute__ ((constructor)) void ctor (void) { asm (""); }
-__attribute__ ((destructor))  void dtor (void) { asm (""); }
-
-EOF
-if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp -o conftest
-		       conftest.c -static -nostartfiles -nostdlib
-		       1>&5'
-  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; }; }; then :
-        if $READELF -WS conftest$ac_exeext | $AWK '
-	{ gsub(/\[ */, "[") }
-	$2 == ".ctors" || $2 == ".dtors" {
-	  size = strtonum("0x" $6)
-	  align = strtonum("0x" $NF)
-	  seen[$2] = 1
-	  stub[$2] = size == align * 2
-	}
-	END {
-	  ctors_ok = !seen[".ctors"] || stub[".ctors"]
-	  dtors_ok = !seen[".dtors"] || stub[".dtors"]
-	  exit ((ctors_ok && dtors_ok) ? 0 : 1)
-	}
-      '; then :
-  libc_cv_ctors_header=no
-fi
-
-else
-        as_fn_error $? "missing __attribute__ ((constructor)) support??" "$LINENO" 5
-
-fi
-rm -f conftest*
-
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ctors_header" >&5
-$as_echo "$libc_cv_ctors_header" >&6; }
-if test $libc_cv_ctors_header = no; then
-  $as_echo "#define NO_CTORS_DTORS_SECTIONS 1" >>confdefs.h
-
-fi
-
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for libunwind-support in compiler" >&5
 $as_echo_n "checking for libunwind-support in compiler... " >&6; }
 if ${libc_cv_cc_with_libunwind+:} false; then :
diff --git a/configure.ac b/configure.ac
index 5f22967..ff00591 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1251,36 +1251,6 @@ if test $libc_cv_have_sdata_section = yes; then
   AC_DEFINE(HAVE_SDATA_SECTION)
 fi
 
-AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
-	       libc_cv_ctors_header, [dnl
-  libc_cv_ctors_header=yes
-  LIBC_TRY_LINK_STATIC([
-__attribute__ ((constructor)) void ctor (void) { asm (""); }
-__attribute__ ((destructor))  void dtor (void) { asm (""); }
-],
-	      [dnl
-      AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
-	{ gsub(/\@<:@ */, "@<:@") }
-	$2 == ".ctors" || $2 == ".dtors" {
-	  size = strtonum("0x" $6)
-	  align = strtonum("0x" $NF)
-	  seen@<:@$2@:>@ = 1
-	  stub@<:@$2@:>@ = size == align * 2
-	}
-	END {
-	  ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
-	  dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
-	  exit ((ctors_ok && dtors_ok) ? 0 : 1)
-	}
-      '], [libc_cv_ctors_header=no])
-    ], [dnl
-      AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
-    ])
-])
-if test $libc_cv_ctors_header = no; then
-  AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
-fi
-
 AC_CACHE_CHECK(for libunwind-support in compiler,
 	       libc_cv_cc_with_libunwind, [
   cat > conftest.c <<EOF
diff --git a/csu/init-first.c b/csu/init-first.c
index d214af7..47aaacd 100644
--- a/csu/init-first.c
+++ b/csu/init-first.c
@@ -73,10 +73,6 @@ _init_first (int argc, char **argv, char **envp)
 #endif
 
   __init_misc (argc, argv, envp);
-
-#if defined SHARED && !defined NO_CTORS_DTORS_SECTIONS
-  __libc_global_ctors ();
-#endif
 }
 
 /* This function is defined here so that if this file ever gets into
diff --git a/elf/Makefile b/elf/Makefile
index 77da61a..6fe1df9 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -98,7 +98,7 @@ ld-map		= $(common-objpfx)ld.map
 endif
 
 ifeq (yes,$(build-shared))
-extra-objs	= $(all-rtld-routines:%=%.os) soinit.os sofini.os interp.os
+extra-objs	= $(all-rtld-routines:%=%.os) sofini.os interp.os
 generated	+= librtld.os dl-allobjs.os ld.so ldd
 install-others	= $(inst_rtlddir)/$(rtld-installed-name)
 install-bin-script = ldd
diff --git a/elf/sofini.c b/elf/sofini.c
index 13e74b7..1c526fd 100644
--- a/elf/sofini.c
+++ b/elf/sofini.c
@@ -1,15 +1,3 @@
-/* Finalizer module for ELF shared C library.  This provides terminating
-   null pointer words in the `.ctors' and `.dtors' sections.  */
-
-#ifndef NO_CTORS_DTORS_SECTIONS
-static void (*const __CTOR_END__[1]) (void)
-     __attribute__ ((used, section (".ctors")))
-     = { 0 };
-static void (*const __DTOR_END__[1]) (void)
-     __attribute__ ((used, section (".dtors")))
-     = { 0 };
-#endif
-
 /* Terminate the frame unwind info section with a 4byte 0 as a sentinel;
    this would be the 'length' field in a real FDE.  */
 
diff --git a/elf/soinit.c b/elf/soinit.c
deleted file mode 100644
index 538eb68..0000000
--- a/elf/soinit.c
+++ /dev/null
@@ -1,43 +0,0 @@
-/* Initializer module for building the ELF shared C library.  This file and
-   sofini.c do the work normally done by crtbeginS.o and crtendS.o, to wrap
-   the `.ctors' and `.dtors' sections so the lists are terminated, and
-   calling those lists of functions.  */
-
-#ifndef NO_CTORS_DTORS_SECTIONS
-# include <stdlib.h>
-
-static void (*const __CTOR_LIST__[1]) (void)
-  __attribute__ ((used, section (".ctors")))
-  = { (void (*) (void)) -1 };
-static void (*const __DTOR_LIST__[1]) (void)
-  __attribute__ ((used, section (".dtors")))
-  = { (void (*) (void)) -1 };
-
-static inline void
-run_hooks (void (*const list[]) (void))
-{
-  while (*++list)
-    (**list) ();
-}
-
-/* This function will be called from _init_first in init-first.c.  */
-void
-__libc_global_ctors (void)
-{
-  /* Call constructor functions.  */
-  run_hooks (__CTOR_LIST__);
-}
-
-
-/* This function becomes the DT_FINI termination function
-   for the C library.  */
-void
-__libc_fini (void)
-{
-  /* Call destructor functions.  */
-  run_hooks (__DTOR_LIST__);
-}
-
-void (*_fini_ptr) (void) __attribute__ ((section (".fini_array")))
-     = &__libc_fini;
-#endif
diff --git a/include/libc-internal.h b/include/libc-internal.h
index 4c74f6b..729db79 100644
--- a/include/libc-internal.h
+++ b/include/libc-internal.h
@@ -24,9 +24,6 @@
 /* Initialize the `__libc_enable_secure' flag.  */
 extern void __libc_init_secure (void);
 
-/* This function will be called from _init_first in init-first.c.  */
-extern void __libc_global_ctors (void);
-
 /* Discover the tick frequency of the machine if something goes wrong,
    we return 0, an impossible hertz.  */
 extern int __profile_frequency (void);
diff --git a/sysdeps/mach/hurd/i386/init-first.c b/sysdeps/mach/hurd/i386/init-first.c
index a7dd489..5e66602 100644
--- a/sysdeps/mach/hurd/i386/init-first.c
+++ b/sysdeps/mach/hurd/i386/init-first.c
@@ -33,7 +33,6 @@
 
 extern void __mach_init (void);
 extern void __init_misc (int, char **, char **);
-extern void __libc_global_ctors (void);
 
 unsigned long int __hurd_threadvar_stack_offset;
 unsigned long int __hurd_threadvar_stack_mask;
@@ -83,10 +82,6 @@ posixland_init (int argc, char **argv, char **envp)
   _dl_non_dynamic_init ();
 #endif
   __init_misc (argc, argv, envp);
-
-#if defined SHARED && !defined NO_CTORS_DTORS_SECTIONS
-  __libc_global_ctors ();
-#endif
 }