[PATCH v3] gdbserver: fix the standalone build

[Mircea Gherzan <mircea.gherzan@intel.com>]

When directly invoking gdb/gdbserver/configure && make, the build will
fail because the $(host_alias) is empty and thus create-version.sh does
not get enough parameters.

The output of gdbserver --version without this patch (built like above):

  [...]
  This gdbserver was configured as ""

After applying this patch:

  [...]
  This gdbserver was configured as "x86_64-unknown-linux-gnu"

Ok to commit?

2013-06-28  Mircea Gherzan  <mircea.gherzan@intel.com>

gdbserver:

	* configure.ac (version_host): Add it.
	(version_host): Add it.
	* configure: Rebuild.
	* Makefile.in (version_host): Add it.
	(version_target): Add it.
	(version.c): Use $(version_host) and $(version_target).

Signed-off-by: Mircea Gherzan <mircea.gherzan@intel.com>
---
 gdb/gdbserver/Makefile.in  |  4 +++-
 gdb/gdbserver/configure    | 10 ++++++++++
 gdb/gdbserver/configure.ac |  8 ++++++++
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/gdb/gdbserver/Makefile.in b/gdb/gdbserver/Makefile.in
index e5ecdd3..9053cf8 100644
--- a/gdb/gdbserver/Makefile.in
+++ b/gdb/gdbserver/Makefile.in
@@ -20,6 +20,8 @@ exec_prefix = @exec_prefix@
 
 host_alias = @host_alias@
 target_alias = @target_alias@
+version_host = @version_host@
+version_target = @version_target@
 program_transform_name = @program_transform_name@
 bindir = @bindir@
 libdir = @libdir@
@@ -391,7 +393,7 @@ force:
 
 version.c: Makefile $(srcdir)/../common/version.in $(srcdir)/../../bfd/version.h $(srcdir)/../common/create-version.sh
 	$(SHELL) $(srcdir)/../common/create-version.sh $(srcdir)/.. \
-	    $(host_alias) $(target_alias) version.c
+	    $(version_host) $(version_target) version.c
 
 xml-builtin.c: stamp-xml; @true
 stamp-xml: $(XML_DIR)/feature_to_c.sh Makefile $(XML_FILES)
diff --git a/gdb/gdbserver/configure b/gdb/gdbserver/configure
index b87fedb..0588c94 100755
--- a/gdb/gdbserver/configure
+++ b/gdb/gdbserver/configure
@@ -589,6 +589,8 @@ ac_includes_default="\
 #endif"
 
 ac_subst_vars='LTLIBOBJS
+version_target
+version_host
 GNULIB_STDINT_H
 extra_libraries
 IPA_DEPFILES
@@ -5926,6 +5928,14 @@ if test x"$STDINT_H" != x; then
 fi
 
 
+# For --version, we want to the print --host/--target exactly
+# as passed to configure.  But if those were not specified, then
+# print the canonical host/target.
+version_host=${host_alias:-$host}
+version_target=${target_alias:-$target}
+
+
+
 ac_config_files="$ac_config_files Makefile"
 
 ac_config_commands="$ac_config_commands default"
diff --git a/gdb/gdbserver/configure.ac b/gdb/gdbserver/configure.ac
index b9928d7..c983d41 100644
--- a/gdb/gdbserver/configure.ac
+++ b/gdb/gdbserver/configure.ac
@@ -471,6 +471,14 @@ if test x"$STDINT_H" != x; then
 fi
 AC_SUBST(GNULIB_STDINT_H)
 
+# For --version, we want to the print --host/--target exactly
+# as passed to configure.  But if those were not specified, then
+# print the canonical host/target.
+version_host=${host_alias:-$host}
+version_target=${target_alias:-$target}
+AC_SUBST(version_host)
+AC_SUBST(version_target)
+
 AC_OUTPUT(Makefile,
 [case x$CONFIG_HEADERS in
 xconfig.h:config.in)
-- 
1.7.12.4