NSS: Replace exported NSS lookup functions with stubs [BZ #21962]

Commit 384ca551743318bd9c9e24a496d6397f2e3f2a49 from 2007 added this to
nss/XXX-lookup.c:

+#ifndef NO_COMPAT
+int
+internal_function attribute_compat_text_section
+DB_COMPAT_FCT (service_user **ni, const char *fct_name, void **fctp)
+{
+  return DB_LOOKUP_FCT (ni, fct_name, NULL, fctp);
+}
+#endif

That is, it adds a pseudo-compat function with an internal_function
attribute.  The function it was supposed to replace did not have the
attribute:

 extern int DB_LOOKUP_FCT (service_user **ni, const char *fct_name,
-			  void **fctp) internal_function;
+			  const char *fct2_name, void **fctp)
+  internal_function;

This changed the calling convention on i386 for the following
functions in the public ABI:

  __nss_passwd_lookup
  __nss_group_lookup
  __nss_hosts_lookup

This commit replaces the functions with always-failing stubs,
with true compat symbols.  Due to a happy accident, the calling
convention of the stub is identical for the internal_function
and non-internal_function case on i386.

In addition, this commit auto-generates the __nss_*_lookup2
function declarations as part of <nsswitch.h>.

1 files changed, 0 insertions, 15 deletions

diff --git a/nss/XXX-lookup.c b/nss/XXX-lookup.c
index 972a210..4941769 100644
--- a/nss/XXX-lookup.c
+++ b/nss/XXX-lookup.c
@@ -34,7 +34,6 @@
 \*******************************************************************/
 
 #define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup2)
-#define DB_COMPAT_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup)
 #define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
 #define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
 
@@ -55,10 +54,6 @@
 
 service_user *DATABASE_NAME_SYMBOL attribute_hidden;
 
-extern int DB_LOOKUP_FCT (service_user **ni, const char *fct_name,
-			  const char *fct2_name, void **fctp);
-libc_hidden_proto (DB_LOOKUP_FCT)
-
 int
 DB_LOOKUP_FCT (service_user **ni, const char *fct_name, const char *fct2_name,
 	       void **fctp)
@@ -73,13 +68,3 @@ DB_LOOKUP_FCT (service_user **ni, const char *fct_name, const char *fct2_name,
   return __nss_lookup (ni, fct_name, fct2_name, fctp);
 }
 libc_hidden_def (DB_LOOKUP_FCT)
-
-
-#ifndef NO_COMPAT
-int
-attribute_compat_text_section
-DB_COMPAT_FCT (service_user **ni, const char *fct_name, void **fctp)
-{
-  return DB_LOOKUP_FCT (ni, fct_name, NULL, fctp);
-}
-#endif