configure: Allow builds without any system or user emulation

The old code aborted configure when no emulation target was selected.
Even after removing the 'exit 1', it tried to read from STDIN
when QEMU was configured with

    configure' '--disable-user' '--disable-system'

This is fixed here.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

diff --git a/Makefile b/Makefile
index def2ae23cd279616d3043b72965a1b3e6f197fc5..04642975af73dab2b30f0e0650955cfbb0acd337 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -52,8 +52,13 @@ SUBDIR_MAKEFLAGS=$(if $(V),,--no-print-directory) BUILD_DIR=$(BUILD_DIR)
 SUBDIR_DEVICES_MAK=$(patsubst %, %/config-devices.mak, $(TARGET_DIRS))
 SUBDIR_DEVICES_MAK_DEP=$(patsubst %, %/config-devices.mak.d, $(TARGET_DIRS))
 
+ifeq ($(SUBDIR_DEVICES_MAK),)
+config-all-devices.mak:
+       $(call quiet-command,echo '# no devices' > $@,"  GEN   $@")
+else
 config-all-devices.mak: $(SUBDIR_DEVICES_MAK)
        $(call quiet-command,cat $(SUBDIR_DEVICES_MAK) | grep =y | sort -u > $@,"  GEN   $@")
+endif
 
 -include $(SUBDIR_DEVICES_MAK_DEP)
 

diff --git a/configure b/configure
index 1b865174e1658c9226e9f1cdd2f835d54b14bf64..8f99b7b941cf3ff4eca81869eb554719c5dea1d8 100755 (executable)
--- a/configure
+++ b/configure
@@ -1286,10 +1286,6 @@ if test -z "$target_list" ; then
 else
     target_list=`echo "$target_list" | sed -e 's/,/ /g'`
 fi
-if test -z "$target_list" ; then
-    echo "No targets enabled"
-    exit 1
-fi
 # see if system emulation was really requested
 case " $target_list " in
   *"-softmmu "*) softmmu=yes