Re: [Qemu-devel] [PATCH 1.3] build: compile translate.o at -O1 optimization

[Wenchao Xia <xiawenc@linux.vnet.ibm.com>]

> Some versions of GCC require insane (>2GB) amounts of memory
> to compile translate.o.  As a countermeasure, compile it
> with -O1.  This should fix the buildbot failure for
> default_x86_64_fedora16.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>   Makefile.target | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/Makefile.target b/Makefile.target
> index 8b658c0..3981931 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -143,6 +143,8 @@ GENERATED_HEADERS += hmp-commands.h qmp-commands-old.h
> 
>   endif # CONFIG_SOFTMMU
> 
> +%/translate.o: CFLAGS := $(patsubst -O2,-O1,$(CFLAGS))
> +
>   nested-vars += obj-y
> 
>   # This resolves all nested paths, so it must come last
> 
  In tcg case I think translate.o will influent performance obviously,
how about adding an option "fast-build" to use -O1 for it by default.
If you agree I will adding that after this patch upstream which fix
build bot failure quickly.

-- 
Best Regards

Wenchao Xia