Re: [Qemu-devel] [PATCH v3] Fix QEMU build on OpenBSD on x86 archs

[Brad Smith <brad@comstyle.com>]

On 10/12/13 7:49 PM, Brad Smith wrote:
> 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. This
> is my initial attempt at trying to get somehting upstream so that QEMU
> both builds out of the box and to resolve the build issue with the
> buildbots that has been around for awhile. We have a patch in our ports
> tree but it is just the flags hardcoded into the Makefile which obviously
> is not appropriate for upstream.
>
>  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>

ping.

> ---
>
> Change in v2:
>      * Fix '==' is not portable syntax.
>
> Change in v3:
>      * Rename variables and use compile_prog to detect the presence of the compiler/linker
>        flags, as suggested by Stefan Weil.
>
> diff --git a/configure b/configure
> index 5d82283..89ae89d 100755
> --- a/configure
> +++ b/configure
> @@ -1365,6 +1365,11 @@ EOF
>         pie="no"
>       fi
>     fi
> +
> +  if compile_prog "-fno-pie" "-nopie"; then
> +    CFLAGS_NOPIE="-fno-pie"
> +    LDFLAGS_NOPIE="-nopie"
> +  fi
>   fi
>
>   ##########################################
> @@ -4320,6 +4325,7 @@ 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
> @@ -4333,6 +4339,7 @@ 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 57d8bd0..ce4852a 100644
> --- 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 $(TARGET_DIR)$@")
>


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