hurd: Fix some ld.so symbol override from libc

ld.so symbols to be overriden by libc need to be extern to really get
overriden.

More fixes are needed to avoid the hidden attribute.

	* sysdeps/mach/hurd/Versions (libc): Make __access and
	__access_noerrno external so they can override the ld symbols.
	(ld): Make __access, __read, __sbrk, __strtoul_internal, __write,
	__writev, __open64, __access_noerrno extern so they can be overrided.
	* sysdeps/mach/hurd/i386/libc.abilist: Update accordingly.
	* sysdeps/mach/hurd/i386/ld.abilist: Update accordingly.

ChangeLog

@@ -1,3 +1,12 @@
+2018-07-27  Samuel Thibault  <samuel.thibault@ens-lyon.org>
+
+	* sysdeps/mach/hurd/Versions (libc): Make __access and
+	__access_noerrno external so they can override the ld symbols.
+	(ld): Make __access, __read, __sbrk, __strtoul_internal, __write,
+	__writev, __open64, __access_noerrno extern so they can be overrided.
+	* sysdeps/mach/hurd/i386/libc.abilist: Update accordingly.
+	* sysdeps/mach/hurd/i386/ld.abilist: Update accordingly.
+
 2018-07-26  Carlos O'Donell  <carlos@redhat.com>
 
 	* po/libc.pot: Regenerate.

sysdeps/mach/hurd/Versions

@@ -1,11 +1,15 @@
 libc {
   GLIBC_2.0 {
     # functions with a weak definition in the dynamic linker
-    __getcwd; __mmap;
+    __access; __getcwd; __mmap;
+  }
+  GLIBC_2.2.6 {
+    # functions with a weak definition in the dynamic linker
+    __writev;
   }
   GLIBC_PRIVATE {
     # Functions shared with the dynamic linker
-    __libc_read; __libc_write; __libc_lseek64;
+    __access_noerrno; __libc_read; __libc_write; __libc_lseek64;
     __libc_lock_self0;
 
     _dl_init_first;
@@ -18,11 +22,16 @@ ld {
     __hurd_threadvar_stack_mask;  __hurd_threadvar_stack_offset;
 
     # functions that must be shared with libc
-    __close; __getcwd; __getpid;
+    __access; __close; __getcwd; __getpid;
-    __mmap; __open; __xstat64; __fxstat64;
+    __mmap; __open; __read; __sbrk; __strtoul_internal;
+    __write; __writev; __xstat64; __fxstat64;
     _exit; _hurd_intr_rpc_mach_msg;
     abort;
   }
+  GLIBC_2.2 {
+    # functions that must be shared with libc
+    __open64;
+  }
   GLIBC_2.2.6 {
     # this also must be shared with libc.
     __errno_location;
@@ -31,7 +40,7 @@ ld {
     _dl_init_first;
 
     # functions that must be shared with libc
-    __libc_read; __libc_write; __libc_lseek64;
+    __access_noerrno; __libc_read; __libc_write; __libc_lseek64;
     __libc_lock_self0;
   }
 }

sysdeps/mach/hurd/dl-sysdep.c

@@ -275,7 +275,10 @@ _dl_sysdep_start_cleanup (void)
 /* Minimal open/close/mmap implementation sufficient for initial loading of
    shared libraries.  These are weak definitions so that when the
    dynamic linker re-relocates itself to be user-visible (for -ldl),
-   it will get the user's definition (i.e. usually libc's).  */
+   it will get the user's definition (i.e. usually libc's).
+
+   They also need to be set in the ld section of sysdeps/mach/hurd/Versions, to
+   be overridable, and in libc.abilist and ld.abilist to be checked. */
 
 /* This macro checks that the function does not get renamed to be hidden: we do
    need these to be overridable by libc's.  */

sysdeps/mach/hurd/i386/ld.abilist

@@ -5,6 +5,10 @@ GLIBC_2.2.6 __getpid F
 GLIBC_2.2.6 __libc_stack_end D 0x4
 GLIBC_2.2.6 __mmap F
 GLIBC_2.2.6 __open F
+GLIBC_2.2.6 __open64 F
+GLIBC_2.2.6 __strtoul_internal F
+GLIBC_2.2.6 __write F
+GLIBC_2.2.6 __writev F
 GLIBC_2.2.6 __xstat64 F
 GLIBC_2.2.6 _dl_mcount F
 GLIBC_2.2.6 _hurd_intr_rpc_mach_msg F

sysdeps/mach/hurd/i386/libc.abilist

@@ -543,6 +543,7 @@ GLIBC_2.2.6 __wctrans_l F
 GLIBC_2.2.6 __wctype_l F
 GLIBC_2.2.6 __woverflow F
 GLIBC_2.2.6 __write F
+GLIBC_2.2.6 __writev F
 GLIBC_2.2.6 __wuflow F
 GLIBC_2.2.6 __wunderflow F
 GLIBC_2.2.6 __xmknod F

sysdeps/mach/hurd/i386/localplt.data

@@ -27,7 +27,7 @@ ld.so: __open64 ?
 ld.so: __close
 ld.so: __read ?
 ld.so: __write ?
-#ld.so: __writev
+ld.so: __writev
 ld.so: __libc_lseek64
 ld.so: __mmap
 ld.so: __fxstat64
@@ -37,7 +37,7 @@ ld.so: __xstat64
 ld.so: __getpid
 #ld.so: __getcwd
 #ld.so: __sbrk
-#ld.so: __strtoul_internal
+ld.so: __strtoul_internal
 #ld.so: _exit
 ld.so: abort
 ld.so: _hurd_intr_rpc_mach_msg