On Mon, Jan 11, 2021 at 11:53:15AM -0800, H.J. Lu via Binutils wrote: > Check if AR is usable for LTO build with --enable-pgo-build=lto: > > checking for -plugin option... ar: no operation specified > Failed: ar --plugin > /usr/gcc-11.0.0-x32/libexec/gcc/x86_64-pc-linux-gnu/11.0.0/liblto_plugin.so rc > no > configure: error: AR with --plugin and rc is required for LTO build > > instead of build failure later. > > PR binutils/26766 > * configure.ac: > * configure: Regenerated.
See pr27173 too. The problem isn't a matter of finding an "ar" that supports --plugin, we have versions of GNU ar (2.30 to 2.32?) that accept --plugin but then don't parse the "rc" or other command options. I don't think this patch will help. > --- > configure | 4 ++++ > configure.ac | 4 ++++ > 2 files changed, 8 insertions(+) > > diff --git a/configure b/configure > index c44184f72ff..84285addafe 100755 > --- a/configure > +++ b/configure > @@ -10240,6 +10240,10 @@ if test -n "$PLUGIN_OPTION"; then > if $RANLIB --help 2>&1 | grep -q "\--plugin"; then > RANLIB_PLUGIN_OPTION="$PLUGIN_OPTION" > fi > +else > + if test "$enable_pgo_build" != "no"; then > + as_fn_error $? "AR with --plugin and rc is required for LTO build" > "$LINENO" 5 > + fi > fi > > > diff --git a/configure.ac b/configure.ac > index 9dd51c36e5a..d39019d7093 100644 > --- a/configure.ac > +++ b/configure.ac > @@ -3452,6 +3452,10 @@ if test -n "$PLUGIN_OPTION"; then > if $RANLIB --help 2>&1 | grep -q "\--plugin"; then > RANLIB_PLUGIN_OPTION="$PLUGIN_OPTION" > fi > +else > + if test "$enable_pgo_build" != "no"; then > + AC_MSG_ERROR([AR with --plugin and rc is required for LTO build]) > + fi > fi > AC_SUBST(AR_PLUGIN_OPTION) > AC_SUBST(RANLIB_PLUGIN_OPTION) > -- > 2.29.2 -- Alan Modra Australia Development Lab, IBM
