Clean up conditionalize of ld.so.cache support.

ChangeLog

@@ -1,3 +1,17 @@
+2012-10-03  Roland McGrath  <roland@hack.frob.com>
+
+	* sysdeps/mach/hurd/dl-cache.c: File removed.
+	* config.h.in (USE_LDCONFIG): New #undef.
+	* configure.in (use_ldconfig): If set, define USE_LDCONFIG.
+	* configure: Regenerated.
+	* elf/Makefile (dl-routines): Add dl-cache only under
+	[$(use-ldconfig) = yes].
+	* elf/dl-load.c (_dl_map_object): Conditionalize code consulting the
+	cache on [USE_LDCONFIG].
+	* elf/dl-open.c (_dl_open): Call _dl_unload_cache only under
+	[USE_LDCONFIG].
+	* elf/rtld.c (dl_main): Likewise.
+
 2012-10-03  Pino Toscano  <toscano.pino@tiscali.it>
 
 	* sysdeps/posix/sysconf.c (__sysconf): Return 0 also for

config.h.in

@@ -177,6 +177,9 @@
 /* Define if library functions should try to contact the nscd daemon.  */
 #undef USE_NSCD
 
+/* Define if the dynamic linker should consult an ld.so.cache file.  */
+#undef USE_LDCONFIG
+
 /*
  */
 

configure

@@ -7493,6 +7493,10 @@ fi
 
 
 
+if test x$use_ldconfig = xyes; then
+  $as_echo "#define USE_LDCONFIG 1" >>confdefs.h
+
+fi
 
 
 

configure.in

@@ -2156,6 +2156,9 @@ AC_SUBST(libc_cv_cc_nofma)
 AC_SUBST(libc_cv_as_i686)
 AC_SUBST(libc_cv_sparc_as_vis3)
 
+if test x$use_ldconfig = xyes; then
+  AC_DEFINE(USE_LDCONFIG)
+fi
 AC_SUBST(use_ldconfig)
 AC_SUBST(ldd_rewrite_script)
 

elf/Makefile

@@ -19,6 +19,8 @@
 
 subdir		:= elf
 
+include ../Makeconfig
+
 headers		= elf.h bits/elfclass.h link.h bits/link.h
 routines	= $(dl-routines) dl-support dl-iteratephdr \
 		  dl-addr enbl-secure dl-profstub \
@@ -26,10 +28,13 @@ routines	= $(dl-routines) dl-support dl-iteratephdr \
 
 # The core dynamic linking functions are in libc for the static and
 # profiled libraries.
-dl-routines	= $(addprefix dl-,load cache lookup object reloc deps \
+dl-routines	= $(addprefix dl-,load lookup object reloc deps \
 				  runtime error init fini debug misc \
 				  version profile conflict tls origin scope \
 				  execstack caller open close trampoline)
+ifeq (yes,$(use-ldconfig))
+dl-routines += dl-cache
+endif
 all-dl-routines = $(dl-routines) $(sysdep-dl-routines)
 # But they are absent from the shared libc, because that code is in ld.so.
 elide-routines.os = $(all-dl-routines) dl-support enbl-secure dl-origin \
@@ -45,8 +50,6 @@ CFLAGS-dl-runtime.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-dl-lookup.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-dl-iterate-phdr.c = $(uses-callbacks)
 
-include ../Makeconfig
-
 ifeq ($(unwind-find-fde),yes)
 routines += unwind-dw2-fde-glibc
 shared-only-routines += unwind-dw2-fde-glibc

elf/dl-load.c

@@ -2197,6 +2197,7 @@ _dl_map_object (struct link_map *loader, const char *name,
 			&loader->l_runpath_dirs, &realname, &fb, loader,
 			LA_SER_RUNPATH, &found_other_class);
 
+#ifdef USE_LDCONFIG
       if (fd == -1
 	  && (__builtin_expect (! (mode & __RTLD_SECURE), 1)
 	      || ! INTUSE(__libc_enable_secure))
@@ -2208,22 +2209,22 @@ _dl_map_object (struct link_map *loader, const char *name,
 
 	  if (cached != NULL)
 	    {
-#ifdef SHARED
+# ifdef SHARED
 	      // XXX Correct to unconditionally default to namespace 0?
 	      l = (loader
 		   ?: GL(dl_ns)[LM_ID_BASE]._ns_loaded
 		   ?: &GL(dl_rtld_map));
-#else
+# else
 	      l = loader;
-#endif
+# endif
 
 	      /* If the loader has the DF_1_NODEFLIB flag set we must not
 		 use a cache entry from any of these directories.  */
 	      if (
-#ifndef SHARED
+# ifndef SHARED
 		  /* 'l' is always != NULL for dynamically linked objects.  */
 		  l != NULL &&
-#endif
+# endif
 		  __builtin_expect (l->l_flags_1 & DF_1_NODEFLIB, 0))
 		{
 		  const char *dirp = system_dirs;
@@ -2261,6 +2262,7 @@ _dl_map_object (struct link_map *loader, const char *name,
 		}
 	    }
 	}
+#endif
 
       /* Finally, try the default path.  */
       if (fd == -1

elf/dl-open.c

@@ -654,8 +654,8 @@ no more namespaces available for dlmopen()"));
   int errcode = _dl_catch_error (&objname, &errstring, &malloced,
 				 dl_open_worker, &args);
 
-#ifndef MAP_COPY
-  /* We must munmap() the cache file.  */
+#if defined USE_LDCONFIG && !defined MAP_COPY
+  /* We must unmap the cache file.  */
   _dl_unload_cache ();
 #endif
 

elf/rtld.c

@@ -2400,7 +2400,7 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
   _dl_debug_state ();
   LIBC_PROBE (init_complete, 2, LM_ID_BASE, r);
 
-#ifndef MAP_COPY
+#if defined USE_LDCONFIG && !defined MAP_COPY
   /* We must munmap() the cache file.  */
   _dl_unload_cache ();
 #endif

sysdeps/mach/hurd/dl-cache.c

@@ -1,28 +0,0 @@
-/* Stubby version of dl-cache; the Hurd doesn't support this "feature".
-   Copyright (C) 1996, 1997 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library 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
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-const char *
-_dl_load_cache_lookup (const char *name)
-{
-  return 0;
-}
-
-void
-_dl_unload_cache (void)
-{
-}