Include .interp section only for libc.so

Barring libc.so and libdl.so, none of the libraries have any entry
points, so it is pointless to add a .interp section for them.  The
libdl.so entry point (in dlfcn/eval.c) is also defunct, so remove that
file as well.

Build tested for x86_64, ppc64 and s390x.  I have not moved
CFLAGS-interp.c to CPPFLAGS-interp.c isnce I'll be removing it
completely in a follow-up patch.

Siddhesh

	* Makerules (lib%.so): Don't include $(+interp) in
	prerequisites.
	* elf/Makefile (CFLAGS-interp.c): Don't define NOT_IN_libc.
	* dlfcn/eval.c: Remove file.

4 files changed, 7 insertions, 203 deletions

diff --git a/ChangeLog b/ChangeLog
index 72d980fe02..45b8cde92c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2014-09-16  Siddhesh Poyarekar  <siddhesh@redhat.com>
 
+	* Makerules (lib%.so): Don't include $(+interp) in
+	prerequisites.
+	* elf/Makefile (CFLAGS-interp.c): Don't define NOT_IN_libc.
+	* dlfcn/eval.c: Remove file.
+
 	* posix/getconf.c (vars): Don't check for _[SP]C_* and _CS
 	macros.
 
diff --git a/Makerules b/Makerules
index 6b30e8ce58..695c9ab597 100644
--- a/Makerules
+++ b/Makerules
@@ -436,7 +436,7 @@ link-libc-deps = $(common-objpfx)libc.so $(common-objpfx)linkobj/libc.so \
 # $(LDLIBS-%.so) may contain -l switches to generate run-time dependencies
 # on other shared objects.  The linking with libc and ld.so is intended
 # to be as similar as possible to a default link with an installed libc.
-lib%.so: lib%_pic.a $(+preinit) $(+postinit) $(+interp) $(link-libc-deps)
+lib%.so: lib%_pic.a $(+preinit) $(+postinit) $(link-libc-deps)
 	$(build-shlib) $(link-libc-args)
 
 define build-shlib-helper
diff --git a/dlfcn/eval.c b/dlfcn/eval.c
deleted file mode 100644
index 9cc307a0c6..0000000000
--- a/dlfcn/eval.c
+++ /dev/null
@@ -1,200 +0,0 @@
-/* You don't really want to know what this hack is for.
-   Copyright (C) 1996-2014 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/>.  */
-
-#include <assert.h>
-#include <ctype.h>
-#include <dlfcn.h>
-#include <errno.h>
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-static void *funcall (char **stringp) __attribute_noinline__;
-static void *eval (char **stringp);
-
-
-long int weak_function
-__strtol_internal (const char *nptr, char **endptr, int base, int group)
-{
-  unsigned long int result = 0;
-  long int sign = 1;
-
-  while (*nptr == ' ' || *nptr == '\t')
-    ++nptr;
-
-  if (*nptr == '-')
-    {
-      sign = -1;
-      ++nptr;
-    }
-  else if (*nptr == '+')
-    ++nptr;
-
-  if (*nptr < '0' || *nptr > '9')
-    {
-      if (endptr != NULL)
-	*endptr = (char *) nptr;
-      return 0L;
-    }
-
-  assert (base == 0);
-  base = 10;
-  if (*nptr == '0')
-    {
-      if (nptr[1] == 'x' || nptr[1] == 'X')
-	{
-	  base = 16;
-	  nptr += 2;
-	}
-      else
-	base = 8;
-    }
-
-  while (*nptr >= '0' && *nptr <= '9')
-    {
-      unsigned long int digval = *nptr - '0';
-      if (result > LONG_MAX / 10
-	  || (sign > 0 ? result == LONG_MAX / 10 && digval > LONG_MAX % 10
-	      : (result == ((unsigned long int) LONG_MAX + 1) / 10
-		 && digval > ((unsigned long int) LONG_MAX + 1) % 10)))
-	{
-	  errno = ERANGE;
-	  return sign > 0 ? LONG_MAX : LONG_MIN;
-	}
-      result *= base;
-      result += digval;
-      ++nptr;
-    }
-
-  return (long int) result * sign;
-}
-
-
-static void *
-funcall (char **stringp)
-{
-  void *args[strlen (*stringp)], **ap = args;
-  void *argcookie = &args[1];
-
-  do
-    {
-      /* Evaluate the next token.  */
-      *ap++ = eval (stringp);
-
-      /* Whitespace is irrelevant.  */
-      while (isspace (**stringp))
-	++*stringp;
-
-      /* Terminate at closing paren or end of line.  */
-    } while (**stringp != '\0' && **stringp != ')');
-  if (**stringp != '\0')
-    /* Swallow closing paren.  */
-    ++*stringp;
-
-  if (args[0] == NULL)
-    {
-      static const char unknown[] = "Unknown function\n";
-      write (1, unknown, sizeof unknown - 1);
-      return NULL;
-    }
-
-  /* Do it to it.  */
-  __builtin_return (__builtin_apply (args[0],
-				     &argcookie,
-				     (char *) ap - (char *) &args[1]));
-}
-
-static void *
-eval (char **stringp)
-{
-  void *value;
-  char *p = *stringp, c;
-
-  /* Whitespace is irrelevant.  */
-  while (isspace (*p))
-    ++p;
-
-  switch (*p)
-    {
-    case '"':
-      /* String constant.  */
-      value = ++p;
-      do
-	if (*p == '\\')
-	  {
-	    switch (*strcpy (p, p + 1))
-	      {
-	      case 't':
-		*p = '\t';
-		break;
-	      case 'n':
-		*p = '\n';
-		break;
-	      }
-	    ++p;
-	  }
-      while (*p != '\0' && *p++ != '"');
-      if (p[-1] == '"')
-	p[-1] = '\0';
-      break;
-
-    case '(':
-      *stringp = ++p;
-      return funcall (stringp);
-
-    default:
-      /* Try to parse it as a number.  */
-      value = (void *) __strtol_internal (p, stringp, 0, 0);
-      if (*stringp != p)
-	return value;
-
-      /* Anything else is a symbol that produces its address.  */
-      value = p;
-      do
-	++p;
-      while (*p != '\0' && !isspace (*p) && (!ispunct (*p) || *p == '_'));
-      c = *p;
-      *p = '\0';
-      value = dlsym (NULL, value);
-      *p = c;
-      break;
-    }
-
-  *stringp = p;
-  return value;
-}
-
-
-extern void _start (void) __attribute__ ((noreturn));
-void
-__attribute__ ((noreturn))
-_start (void)
-{
-  char *buf = NULL;
-  size_t bufsz = 0;
-
-  while (__getdelim (&buf, &bufsz, '\n', stdin) > 0)
-    {
-      char *p = buf;
-      eval (&p);
-    }
-
-  exit (0);
-}
diff --git a/elf/Makefile b/elf/Makefile
index 25012cc2d8..e3bd69223a 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -354,8 +354,7 @@ $(objpfx)ld.so: $(objpfx)librtld.os $(ld-map)
 	mv -f $@.new $@
 
 # interp.c exists just to get this string into the libraries.
-CFLAGS-interp.c = -D'RUNTIME_LINKER="$(rtlddir)/$(rtld-installed-name)"' \
-		  -DNOT_IN_libc=1
+CFLAGS-interp.c = -D'RUNTIME_LINKER="$(rtlddir)/$(rtld-installed-name)"'
 $(objpfx)interp.os: $(common-objpfx)config.make
 
 ifneq (ld.so,$(rtld-installed-name))