Enable power10 multilib

Co-authored-by: Florian Weimer <fweimer@redhat.com>

glibc.spec

@@ -61,6 +61,13 @@
 %endif
 %endif
 
+# Build the POWER10 multilib.
+%ifarch ppc64le
+%define buildpower10 1
+%else
+%define buildpower10 0
+%endif
+
 %if %{with bootstrap}
 # Disable benchtests, -Werror, docs, and valgrind if we're bootstrapping
 %undefine with_benchtests
@@ -1359,6 +1366,17 @@ build build-%{target} \
 %endif
 #
 
+# POWER10 build variant.
+%if %{buildpower10}
+build build-%{target}-power10 \
+  CC="gcc $glibc_flags_cc" \
+  CXX="g++ $glibc_flags_cc" \
+  CFLAGS="$glibc_flags_cflags" \
+  --with-cpu=power10 \
+#
+%endif
+
+
 ##############################################################################
 # Install glibc...
 ##############################################################################
@@ -1437,23 +1455,28 @@ install_different()
 	mkdir -p "$destdir"
 	mkdir -p "$libdestdir"
 	# Walk all of the libraries we installed...
-	for lib in libc math/libm nptl/libpthread rt/librt nptl_db/libthread_db
+	for lib in libc math/libm
 	do
 		libbase=${lib#*/}
 		# Take care that `libbaseso' has a * that needs expanding so
 		# take care with quoting.
-		libbaseso=$(basename %{glibc_sysroot}/%{_lib}/${libbase}-*.so)
+		libbaseso=$(basename %{glibc_sysroot}/%{_lib}/${libbase}.so.*)
 		# Only install if different from default build library.
 		if cmp -s ${lib}.so ../build-%{target}/${lib}.so; then
 			ln -sf "$subdir_up"/$libbaseso $libdestdir/$libbaseso
 		else
 			cp -a ${lib}.so $libdestdir/$libbaseso
 		fi
-		dlib=$libdestdir/$(basename %{glibc_sysroot}/%{_lib}/${libbase}.so.*)
-		ln -sf $libbaseso $dlib
 	done
 }
 
+%if %{buildpower10}
+pushd build-%{target}-power10
+install_different "$RPM_BUILD_ROOT/%{_libdir}/glibc-hwcaps" power10 ..
+popd
+%endif
+
+
 ##############################################################################
 # Remove the files we don't want to distribute
 ##############################################################################
@@ -2185,6 +2208,16 @@ pushd build-%{target}
 run_tests
 popd
 
+%if %{buildpower10}
+# Run this test only if the server supports Power10 instructions.
+if LD_SHOW_AUXV=1 /bin/true | grep -E "AT_HWCAP2:[^$]*arch_3_1" > /dev/null; then
+  echo ====================TESTING -mcpu=power10=============
+  pushd build-%{target}-power10
+  run_tests
+  popd
+fi
+%endif
+
 echo ====================TESTING END=====================
 PLTCMD='/^Relocation section .*\(\.rela\?\.plt\|\.rela\.IA_64\.pltoff\)/,/^$/p'
 echo ====================PLT RELOCS LD.SO================
@@ -2406,6 +2439,9 @@ update_gconv_modules_cache ()
 
 %files -f glibc.filelist
 %dir %{_prefix}/%{_lib}/audit
+%if %{buildpower10}
+%dir /%{_libdir}/glibc-hwcaps/power10
+%endif
 %verify(not md5 size mtime) %config(noreplace) /etc/ld.so.conf
 %verify(not md5 size mtime) %config(noreplace) /etc/rpc
 %dir /etc/ld.so.conf.d