Fix QEMU build on OpenBSD on x86 archs

This resolves the build issue with building the ROMs on OpenBSD on x86 archs.
As of OpenBSD 5.3 the compiler builds PIE binaries by default and thus the
whole OS/packages and so forth. The ROMs need to have PIE disabled.
Check in configure whether the compiler supports the flags for disabling
PIE, and if it does then use them for building the ROMs. This fixes the
following buildbot failure:

>From the OpenBSD buildbots..
  Building optionrom/multiboot.img
ld: multiboot.o: relocation R_X86_64_16 can not be used when making a shared object; recompile with -fPIC

Signed-off by: Brad Smith <brad@comstyle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/configure b/configure
index 0eadab5f00ef4fa0aa0eea9eef5bfa3dd923a100..4648117957465e554bd0005dc51d7e1750b97526 100755 (executable)
--- a/configure
+++ b/configure
@@ -1392,6 +1392,11 @@ EOF
       pie="no"
     fi
   fi
+
+  if compile_prog "-fno-pie" "-nopie"; then
+    CFLAGS_NOPIE="-fno-pie"
+    LDFLAGS_NOPIE="-nopie"
+  fi
 fi
 
 ##########################################
@@ -4378,6 +4383,7 @@ echo "LD=$ld" >> $config_host_mak
 echo "WINDRES=$windres" >> $config_host_mak
 echo "LIBTOOL=$libtool" >> $config_host_mak
 echo "CFLAGS=$CFLAGS" >> $config_host_mak
+echo "CFLAGS_NOPIE=$CFLAGS_NOPIE" >> $config_host_mak
 echo "QEMU_CFLAGS=$QEMU_CFLAGS" >> $config_host_mak
 echo "QEMU_INCLUDES=$QEMU_INCLUDES" >> $config_host_mak
 if test "$sparse" = "yes" ; then
@@ -4391,6 +4397,7 @@ else
   echo "AUTOCONF_HOST := "                             >> $config_host_mak
 fi
 echo "LDFLAGS=$LDFLAGS" >> $config_host_mak
+echo "LDFLAGS_NOPIE=$LDFLAGS_NOPIE" >> $config_host_mak
 echo "LIBTOOLFLAGS=$LIBTOOLFLAGS" >> $config_host_mak
 echo "LIBS+=$LIBS" >> $config_host_mak
 echo "LIBS_TOOLS+=$libs_tools" >> $config_host_mak

diff --git a/pc-bios/optionrom/Makefile b/pc-bios/optionrom/Makefile
index 57d8bd0d6c0e1763e35c45f93da5b3b301861f4c..ce4852a4d55d114a6bc21d92da8b0b0b90e0e6c3 100644 (file)
--- a/pc-bios/optionrom/Makefile
+++ b/pc-bios/optionrom/Makefile
@@ -12,6 +12,7 @@ $(call set-vpath, $(SRC_PATH)/pc-bios/optionrom)
 CFLAGS := -Wall -Wstrict-prototypes -Werror -fomit-frame-pointer -fno-builtin
 CFLAGS += -I$(SRC_PATH)
 CFLAGS += $(call cc-option, $(CFLAGS), -fno-stack-protector)
+CFLAGS += $(CFLAGS_NOPIE)
 QEMU_CFLAGS = $(CFLAGS)
 
 build-all: multiboot.bin linuxboot.bin kvmvapic.bin
@@ -20,7 +21,7 @@ build-all: multiboot.bin linuxboot.bin kvmvapic.bin
 .SECONDARY:
 
 %.img: %.o
-       $(call quiet-command,$(LD) -Ttext 0 -e _start -s -o $@ $<,"  Building $(TARGET_DIR)$@")
+       $(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -Ttext 0 -e _start -s -o $@ $<,"  Building $(TARGET_DIR)$@")
 
 %.raw: %.img
        $(call quiet-command,$(OBJCOPY) -O binary -j .text $< $@,"  Building $(TARGET_DIR)$@")