Re: [Qemu-devel] [PATCH v5 1.0] configure: build position independent executables across for x86 hosts

[Avi Kivity <avi@redhat.com>]

On 11/15/2011 11:10 AM, Peter Maydell wrote:
> On 15 November 2011 08:00, Avi Kivity <avi@redhat.com> wrote:
>
> > @@ -1099,6 +1099,37 @@ for flag in $gcc_flags; do
> >     fi
> >  done
> >
> > +if test "$pie" = "yes" -a "$static" = "yes" ; then
> > +  echo "static and pie are mutually incompatible"
> > +  exit 1
> > +fi
>
> The -a operator to test has been marked obsolescent in
> POSIX -- please don't use it in new code. (Use
> if test "$pie" = yes && test "$static" = yes; then )

Okay.  For 1.1, I'll convert this script to python.

> > +if test "$pie" = "yes" ; then
> > +  cat > $TMPC << EOF
> > +int main(void) { return 0; }
> > +EOF
> > +  if compile_prog "-fPIE -DPIE" "-Wl,-pie"; then
> > +    QEMU_CFLAGS="-fPIE -DPIE $QEMU_CFLAGS"
> > +    LDFLAGS="-Wl,-pie $LDFLAGS"
> > +    if compile_prog "-fPIE -DPIE" "-Wl,-pie -Wl,-z,relro -Wl,-z,now"; then
> > +      LDFLAGS="-Wl,-z,relro -Wl,-z,now $LDFLAGS"
>
> Why does this second compile test put -fPIE -DPIE into
> its local cflags and -Wl,-pie into its local ldflags
> when we just put them into the global cflags/ldflags?

Ah, I didn't realize compile_prog considered those.  Will make
parallelizing it harder.  Will fix.

> > +    fi
> > +  else
> > +    echo "Disabling PIE due to missing toolchain support"
> > +    pie="no"
>
> This means that if the user explicitly asked for PIE (with
> --enable-pie") we will carry on even if we couldn't do it.
> Usually for configure if the user asked for something then
> not providing it is a fatal error.

Yeah.

-- 
error compiling committee.c: too many arguments to function