Re: [PATCH] configure: fix performance regression due to PIC objects

[Philippe Mathieu-Daudé]

Cc'ing Aleksandar as Ahmed is away.

On 9/19/20 5:56 PM, Paolo Bonzini wrote:
> Because most files in QEMU are grouped into static libraries, Meson 
> conservatively
> compiles them with -fPIC.  This is overkill and produces slowdowns up to 20% 
> on
> some TCG tests.
> 
> As a stopgap measure, use the b_staticpic option to limit the slowdown to
> --enable-pie.  https://github.com/mesonbuild/meson/pull/7760 will allow
> us to use b_staticpic=false and let Meson do the right thing.
> 
> Reported-by: Ahmed Karaman <ahmedkrmn@outlook.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  configure | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/configure b/configure
> index 0004c46525..0786144043 100755
> --- a/configure
> +++ b/configure
> @@ -7414,6 +7414,7 @@ NINJA=${ninja:-$PWD/ninjatool} $meson setup \
>          -Dwerror=$(if test "$werror" = yes; then echo true; else echo false; 
> fi) \
>          -Dstrip=$(if test "$strip_opt" = yes; then echo true; else echo 
> false; fi) \
>          -Db_pie=$(if test "$pie" = yes; then echo true; else echo false; fi) 
> \
> +        -Db_staticpic=$(if test "$pie" = yes; then echo true; else echo 
> false; fi) \
>          -Db_coverage=$(if test "$gcov" = yes; then echo true; else echo 
> false; fi) \
>       -Dmalloc=$malloc -Dmalloc_trim=$malloc_trim -Dsparse=$sparse \
>       -Dkvm=$kvm -Dhax=$hax -Dwhpx=$whpx -Dhvf=$hvf \
>