Re: [Qemu-devel] [PATCH 2/2] build: Use $(AS) for optionrom explicitly

["Alex Bennée" <alex.bennee@linaro.org>]

Richard Henderson <rth@twiddle.net> writes:

> For clang before 3.5, -fno-integrated-as does not exist,
> so the workaround in 5f6f0e27fb24 fails to build.
>
> Use clang's default assembler for linux-user/safe-syscall.S,
> and explicitly change to use the system assembler for the
> option roms.
>
> Signed-off-by: Richard Henderson <rth@twiddle.net>
> ---
>  configure                  | 10 +++-------
>  pc-bios/optionrom/Makefile |  3 +++
>  rules.mak                  |  2 +-
>  3 files changed, 7 insertions(+), 8 deletions(-)
>
> diff --git a/configure b/configure
> index e9090a0..5ada56d 100755
> --- a/configure
> +++ b/configure
> @@ -368,6 +368,7 @@ else
>  fi
>  
>  ar="${AR-${cross_prefix}ar}"
> +as="${AS-${cross_prefix}as}"
>  ccas="${CCAS-$cc}"
>  cpp="${CPP-$cc -E}"
>  objcopy="${OBJCOPY-${cross_prefix}objcopy}"
> @@ -4490,13 +4491,6 @@ if test "$fortify_source" != "no"; then
>    fi
>  fi
>  
> -#################################################
> -# clang does not support the 16-bit assembly for roms
> -
> -if echo | $ccas -dM -E - | grep __clang__ > /dev/null 2>&1 ; then
> -  ccas="$ccas -fno-integrated-as"
> -fi
> -
>  ##########################################
>  # check if struct fsxattr is available via linux/fs.h
>  
> @@ -5515,6 +5509,7 @@ echo "CXX=$cxx" >> $config_host_mak
>  echo "OBJCC=$objcc" >> $config_host_mak
>  echo "AR=$ar" >> $config_host_mak
>  echo "ARFLAGS=$ARFLAGS" >> $config_host_mak
> +echo "AS=$as" >> $config_host_mak
>  echo "CCAS=$ccas" >> $config_host_mak
>  echo "CPP=$cpp" >> $config_host_mak
>  echo "OBJCOPY=$objcopy" >> $config_host_mak
> @@ -5988,6 +5983,7 @@ for rom in seabios vgabios ; do
>      config_mak=roms/$rom/config.mak
>      echo "# Automatically generated by configure - do not modify" > $config_mak
>      echo "SRC_PATH=$source_path/roms/$rom" >> $config_mak
> +    echo "AS=$as" >> $config_mak
>      echo "CCAS=$ccas" >> $config_mak
>      echo "CC=$cc" >> $config_mak
>      echo "BCC=bcc" >> $config_mak
> diff --git a/pc-bios/optionrom/Makefile b/pc-bios/optionrom/Makefile
> index ce4852a..2cdda87 100644
> --- a/pc-bios/optionrom/Makefile
> +++ b/pc-bios/optionrom/Makefile
> @@ -20,6 +20,9 @@ build-all: multiboot.bin linuxboot.bin kvmvapic.bin
>  # suppress auto-removal of intermediate files
>  .SECONDARY:
>  
> +%.o: %.S
> +	$(call quiet-command,$(CPP) $(QEMU_INCLUDES) $(QEMU_DGFLAGS) $(CFLAGS) -c -o - $< | $(AS) $(ASFLAGS) -o $@,"  AS    $(TARGET_DIR)$@")
> +
>  %.img: %.o
>  	$(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -Ttext 0 -e _start -s -o $@ $<,"  Building $(TARGET_DIR)$@")
>  
> diff --git a/rules.mak b/rules.mak
> index 7d7d83b..ed8e482 100644
> --- a/rules.mak
> +++ b/rules.mak
> @@ -69,7 +69,7 @@ LINK = $(call quiet-command, $(LINKPROG) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o
>         $(version-obj-y) $(call extract-libs,$1) $(LIBS),"  LINK  $(TARGET_DIR)$@")
>  
>  %.o: %.S
> -	$(call quiet-command,$(CCAS) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<,"  AS    $(TARGET_DIR)$@")
> +	$(call quiet-command,$(CCAS) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<,"  CCAS  $(TARGET_DIR)$@")
>  
>  %.o: %.cc
>  	$(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<,"  CXX   $(TARGET_DIR)$@")

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>

-- 
Alex Bennée