On Sun, May 2, 2021 at 3:27 PM H.J. Lu wrote:
>
> On Tue, Mar 23, 2021 at 3:39 PM H.J. Lu wrote:
> >
> > Check if host supports multi-byte NOPs before enabling CET on host.
> >
> > config/
> >
> > PR binutils/27397
> > * cet.m4 (GCC_CET_HOST_FLAGS): Check if host supports multi-byte
> > NOPs.
> >
> > libiberty/
> >
> > PR binutils/27397
> > * configure: Regenerated.
> > ---
> > config/cet.m4 | 19 ---
> > libiberty/configure | 29 +
> > 2 files changed, 45 insertions(+), 3 deletions(-)
> >
> > diff --git a/config/cet.m4 b/config/cet.m4
> > index c67fb4f35b6..7718be1afe8 100644
> > --- a/config/cet.m4
> > +++ b/config/cet.m4
> > @@ -130,6 +130,18 @@ fi
> > if test x$may_have_cet = xyes; then
> >if test x$cross_compiling = xno; then
> > AC_TRY_RUN([
> > +int
> > +main ()
> > +{
> > + asm ("endbr32");
> > + return 0;
> > +}
> > +],
> > +[have_multi_byte_nop=yes],
> > +[have_multi_byte_nop=no])
> > +have_cet=no
> > +if test x$have_multi_byte_nop = xyes; then
> > + AC_TRY_RUN([
> > static void
> > foo (void)
> > {
> > @@ -155,9 +167,10 @@ main ()
> >bar ();
> >return 0;
> > }
> > -],
> > -[have_cet=no],
> > -[have_cet=yes])
> > + ],
> > + [have_cet=no],
> > + [have_cet=yes])
> > +fi
> > if test x$enable_cet = xno -a x$have_cet = xyes; then
> >AC_MSG_ERROR([Intel CET must be enabled on Intel CET enabled host])
> > fi
> > diff --git a/libiberty/configure b/libiberty/configure
> > index 2ea7c119809..fc0c953dd1a 100755
> > --- a/libiberty/configure
> > +++ b/libiberty/configure
> > @@ -5396,6 +5396,34 @@ else
> >cat confdefs.h - <<_ACEOF >conftest.$ac_ext
> > /* end confdefs.h. */
> >
> > +int
> > +main ()
> > +{
> > + asm ("endbr32");
> > + return 0;
> > +}
> > +
> > +_ACEOF
> > +if ac_fn_c_try_run "$LINENO"; then :
> > + have_multi_byte_nop=yes
> > +else
> > + have_multi_byte_nop=no
> > +fi
> > +rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
> > + conftest.$ac_objext conftest.beam conftest.$ac_ext
> > +fi
> > +
> > +have_cet=no
> > +if test x$have_multi_byte_nop = xyes; then
> > + if test "$cross_compiling" = yes; then :
> > + { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
> > +$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
> > +as_fn_error $? "cannot run test program while cross compiling
> > +See \`config.log' for more details" "$LINENO" 5; }
> > +else
> > + cat confdefs.h - <<_ACEOF >conftest.$ac_ext
> > +/* end confdefs.h. */
> > +
> > static void
> > foo (void)
> > {
> > @@ -5432,6 +5460,7 @@ rm -f core *.core core.conftest.* gmon.out bb.out
> > conftest$ac_exeext \
> >conftest.$ac_objext conftest.beam conftest.$ac_ext
> > fi
> >
> > +fi
> > if test x$enable_cet = xno -a x$have_cet = xyes; then
> >as_fn_error $? "Intel CET must be enabled on Intel CET enabled host"
> > "$LINENO" 5
> > fi
> > --
> > 2.30.2
> >
>
> This patch has been checked into binutils, which also fixes:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99703
>
> Any objections to sync cet.m4 with binutils next week?
I think syncing is fine at any point.
> --
> H.J.
