Move -lsocket check to common.m4

A user pointed out that the -lsocket check in gdb should also apply to
gdbserver -- otherwise it can't find the Solaris socketpair.  This
patch makes the change.  It also removes a couple of redundant
function checks from gdb's configure.ac.

This was tested by the person who reported the bug.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30927
Approved-By: Pedro Alves <pedro@palves.net>

1 files changed, 57 insertions, 0 deletions

diff --git a/gdbserver/configure b/gdbserver/configure
index e807c60..2020432 100755
--- a/gdbserver/configure
+++ b/gdbserver/configure
@@ -7137,6 +7137,63 @@ $as_echo "#define HAVE_WORKING_FORK 1" >>confdefs.h
 
 fi
 
+  # Some systems (e.g. Solaris) have `socketpair' in libsocket.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing socketpair" >&5
+$as_echo_n "checking for library containing socketpair... " >&6; }
+if ${ac_cv_search_socketpair+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char socketpair ();
+int
+main ()
+{
+return socketpair ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' socket; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_socketpair=$ac_res
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext
+  if ${ac_cv_search_socketpair+:} false; then :
+  break
+fi
+done
+if ${ac_cv_search_socketpair+:} false; then :
+
+else
+  ac_cv_search_socketpair=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_socketpair" >&5
+$as_echo "$ac_cv_search_socketpair" >&6; }
+ac_res=$ac_cv_search_socketpair
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+
+fi
+
   for ac_func in fdwalk getrlimit pipe pipe2 poll socketpair sigaction \
 		  ptrace64 sbrk setns sigaltstack sigprocmask \
 		  setpgid setpgrp getrusage getauxval sigtimedwait