Update feature tests to test for libvncserver.

VESA support doesn't get compiled in unless libvncserver
is installed.

Signed-off-by: John Floren <j...@jfloren.net>
[ turning code into patches and cleanup ]
Signed-off-by: Sasha Levin <levinsasha...@gmail.com>
---
 tools/kvm/Makefile                 |   11 ++++++++++-
 tools/kvm/config/feature-tests.mak |   10 ++++++++++
 2 files changed, 20 insertions(+), 1 deletions(-)

diff --git a/tools/kvm/Makefile b/tools/kvm/Makefile
index e6e8d4e..2ebc86c 100644
--- a/tools/kvm/Makefile
+++ b/tools/kvm/Makefile
@@ -58,6 +58,14 @@ ifeq ($(has_bfd),y)
        LIBS    += -lbfd
 endif
 
+FLAGS_VNCSERVER=$(CFLAGS) -lvncserver
+has_vncserver := $(call try-cc,$(SOURCE_VNCSERVER),$(FLAGS_VNCSERVER))
+ifeq ($(has_vncserver),y)
+       CFLAGS  += -DCONFIG_HAS_VNCSERVER
+       OBJS    += hw/vesa.o
+       LIBS    += -lvncserver
+endif
+
 DEPS   := $(patsubst %.o,%.d,$(OBJS))
 
 # Exclude BIOS object files from header dependencies.
@@ -153,9 +161,10 @@ bios/bios.o: bios/bios.S bios/bios-rom.bin
 bios/bios-rom.bin: bios/bios-rom.S bios/e820.c
        $(E) "  CC      " $@
        $(Q) $(CC) -include code16gcc.h $(CFLAGS) $(BIOS_CFLAGS) -c -s 
bios/e820.c -o bios/e820.o
+       $(Q) $(CC) -include code16gcc.h $(CFLAGS) $(BIOS_CFLAGS) -c -s 
bios/int10.c -o bios/int10.o
        $(Q) $(CC) $(CFLAGS) $(BIOS_CFLAGS) -c -s bios/bios-rom.S -o 
bios/bios-rom.o
        $(E) "  LD      " $@
-       $(Q) ld -T bios/rom.ld.S -o bios/bios-rom.bin.elf bios/bios-rom.o 
bios/e820.o
+       $(Q) ld -T bios/rom.ld.S -o bios/bios-rom.bin.elf bios/bios-rom.o 
bios/e820.o bios/int10.o
        $(E) "  OBJCOPY " $@
        $(Q) objcopy -O binary -j .text bios/bios-rom.bin.elf bios/bios-rom.bin
        $(E) "  NM      " $@
diff --git a/tools/kvm/config/feature-tests.mak 
b/tools/kvm/config/feature-tests.mak
index 6170fd2..0801b54 100644
--- a/tools/kvm/config/feature-tests.mak
+++ b/tools/kvm/config/feature-tests.mak
@@ -126,3 +126,13 @@ int main(void)
        return 0;
 }
 endef
+
+define SOURCE_VNCSERVER
+#include <rfb/rfb.h>
+
+int main(void)
+{
+       rfbIsActive((void *)0);
+       return 0;
+}
+endef
-- 
1.7.5.rc3

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