Remove 'grp' and merge into 'nss' and 'posix'

The majority of grp routines are entry points for nss functionality.
This commit removes the 'grp' subdirectory and moves all nss-relevant
functionality and all tests to 'nss', and the 'setgroups' stub into
'posix' (alongside the 'getgroups' stub).  References to grp/ are
accordingly changed.  In addition, compat-initgroups.c, a fallback
implementation of initgroups is renamed to initgroups-fallback.c so that
the build system does not confuse it for nss_compat/compat-initgroups.c.

Build time improves very slightly; e.g. down from an average of 45.5s to
44.5s on an 8-thread mobile x86_64 CPU.
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/nss/Versions b/nss/Versions
index e551524aa9..5401829911 100644
--- a/nss/Versions
+++ b/nss/Versions
@@ -5,10 +5,38 @@ libc {
     # Functions exported as no-op compat symbols.
     __nss_passwd_lookup; __nss_group_lookup; __nss_hosts_lookup; __nss_next;
     __nss_database_lookup;
+
+    # e*
+    endgrent;
+
+    # f*
+    fgetgrent; fgetgrent_r;
+
+    # g*
+    getgrent; getgrent_r; getgrgid; getgrgid_r; getgrnam; getgrnam_r;
+    getgroups;
+
+    # i*
+    initgroups;
+
+    # s*
+    setgrent;
+  }
+  GLIBC_2.1 {
+    # p*
+    putgrent;
+  }
+  GLIBC_2.1.2 {
+    # g*
+    getgrent_r; getgrgid_r; getgrnam_r;
   }
   GLIBC_2.2.2 {
     __nss_hostname_digits_dots;
   }
+  GLIBC_2.2.4 {
+    # g*
+    getgrouplist;
+  }
   GLIBC_2.27 {
   }
   GLIBC_PRIVATE {
@@ -107,6 +135,8 @@ libc {
     _nss_files_initgroups_dyn;
 
     _nss_files_init;
+
+    __merge_grp; __copy_grp;
   }
 }