[gcc r11-5670] libstdc++: Use libatomic for tests on all 32-bit powerpc targets

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:dd053eea0be4f3ec8b76fb2e103a13a3977bcf9f

commit r11-5670-gdd053eea0be4f3ec8b76fb2e103a13a3977bcf9f
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Dec 2 16:37:56 2020 +0000

    libstdc++: Use libatomic for tests on all 32-bit powerpc targets
    
    In addition to the existing powerpc targets, powerpc64 needs libatomic
    for 64-bit atomics when testing the 32-bit multilib with -m32. Adjust
    the existing target checks to match all 32-bit powerpc targets, but not
    64-bit ones.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/lib/dg-options.exp (add_options_for_libatomic):
            Replace powerpc-ibm-aix* and powerpc*-*-darwin* with check for
            powerpc && ilp32.

Diff:
---
 libstdc++-v3/testsuite/lib/dg-options.exp | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/libstdc++-v3/testsuite/lib/dg-options.exp b/libstdc++-v3/testsuite/lib/dg-options.exp
index d3f61cb5267..0102acf65a2 100644
--- a/libstdc++-v3/testsuite/lib/dg-options.exp
+++ b/libstdc++-v3/testsuite/lib/dg-options.exp
@@ -257,13 +257,14 @@ proc add_options_for_net_ts { flags } {
     return $flags
 }
 
-# Add to FLAGS all the target-specific flags to link to libatomic, if required.
+# Add to FLAGS all the target-specific flags to link to libatomic,
+# if required for atomics on pointers and 64-bit types.
 
 proc add_options_for_libatomic { flags } {
     if { [istarget hppa*-*-hpux*]
-	 || [istarget powerpc-ibm-aix*]
-	 || [istarget powerpc*-*-darwin*]
-	 || [istarget riscv*-*-*] } {
+	 || ([istarget powerpc*-*-*] && [check_effective_target_ilp32])
+	 || [istarget riscv*-*-*]
+       } {
 	return "$flags -L../../libatomic/.libs -latomic"
     }
     return $flags