add enable-inprocess-agent configure option

[Nathan Sidwell <nathan@codesourcery.com>]

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This patch adds explicit configure control over whether the 
fast/static-tracepoint inprocess agent is built, on targets that support it. 
Also, if you explicitly enable the agent, but the target does not support it, 
you get a configure-time error.

ok?

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::         CodeSourcery


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2010-09-09  Nathan Sidwell  <nathan@codesourcery.com>

	* configure.ac: Add --enable-inprocess-agent option.
	* configure: Rebuilt.

Index: gdb/gdbserver/configure.ac
===================================================================
--- gdb/gdbserver/configure.ac	(revision 298677)
+++ gdb/gdbserver/configure.ac	(working copy)
@@ -357,15 +357,35 @@ AC_COMPILE_IFELSE(AC_LANG_PROGRAM([]),
 	        	[gdbsrv_cv_have_visibility_hidden=no])
 CFLAGS="$saved_cflags"
 
+
 IPA_DEPFILES=""
+extra_libraries=""
 
-# Rather than allowing to build a broken IPA, we simply disable it if
-# we don't find a compiler supporting all the features we need.
+# check whether to enable the inprocess agent
 if test "$ipa_obj" != "" \
    -a "$gdbsrv_cv_have_sync_builtins" = yes \
    -a "$gdbsrv_cv_have_visibility_hidden" = yes; then
-   IPA_DEPFILES="$ipa_obj"
-   extra_libraries="libinproctrace.so"
+   have_ipa=true
+else
+   have_ipa=false
+fi
+
+AC_ARG_ENABLE(inprocess-agent,
+AS_HELP_STRING([--enable-inprocess-agent], [inprocess agent]),
+[case "$enableval" in
+  yes) want_ipa=true ;;
+  no) want_ipa=false ;;
+  *) AC_MSG_ERROR([bad value $enableval for inprocess-agent]) ;;
+esac],
+[want_ipa=$have_ipa])
+
+if $want_ipa ; then
+   if $have_ipa ; then
+     IPA_DEPFILES="$ipa_obj"
+     extra_libraries="$extra_libraries libinproctrace.so"
+   else
+     AC_MSG_ERROR([inprocess agent not supported for this target])
+   fi
 fi
 
 AC_SUBST(GDBSERVER_DEPFILES)
Index: gdb/gdbserver/configure
===================================================================
--- gdb/gdbserver/configure	(revision 298677)
+++ gdb/gdbserver/configure	(working copy)
@@ -680,6 +680,7 @@ enable_werror
 with_pkgversion
 with_bugurl
 with_libthread_db
+enable_inprocess_agent
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1309,6 +1310,8 @@ Optional Features:
   --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
   --enable-werror         treat compile warnings as errors
+  --enable-inprocess-agent
+                          inprocess agent
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -4904,15 +4907,38 @@ fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 CFLAGS="$saved_cflags"
 
+
 IPA_DEPFILES=""
+extra_libraries=""
 
-# Rather than allowing to build a broken IPA, we simply disable it if
-# we don't find a compiler supporting all the features we need.
+# check whether to enable the inprocess agent
 if test "$ipa_obj" != "" \
    -a "$gdbsrv_cv_have_sync_builtins" = yes \
    -a "$gdbsrv_cv_have_visibility_hidden" = yes; then
-   IPA_DEPFILES="$ipa_obj"
-   extra_libraries="libinproctrace.so"
+   have_ipa=true
+else
+   have_ipa=false
+fi
+
+# Check whether --enable-inprocess-agent was given.
+if test "${enable_inprocess_agent+set}" = set; then :
+  enableval=$enable_inprocess_agent; case "$enableval" in
+  yes) want_ipa=true ;;
+  no) want_ipa=false ;;
+  *) as_fn_error "bad value $enableval for inprocess-agent" "$LINENO" 5 ;;
+esac
+else
+  want_ipa=$have_ipa
+fi
+
+
+if $want_ipa ; then
+   if $have_ipa ; then
+     IPA_DEPFILES="$ipa_obj"
+     extra_libraries="$extra_libraries libinproctrace.so"
+   else
+     as_fn_error "inprocess agent not supported for this target" "$LINENO" 5
+   fi
 fi