Tested cris-elf and native x86_64-pc-linux-gnu.
Ok to commit?

-----8< ------

For targets where the ABI mandates structure layout that has
no padding, like cris-elf, this test started failing when
introduced as an add-on to the existing 1.cc, thereby
effectively causing a regression in testsuite results.
Adding an empty structure to S0, corresponds better to the
layout of hh_mm_ss<seconds>.

        PR testsuite/108632
        * testsuite/std/time/hh_mm_ss/1.cc (size): Add empty
        struct at end of S0.
---
 libstdc++-v3/testsuite/std/time/hh_mm_ss/1.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/testsuite/std/time/hh_mm_ss/1.cc 
b/libstdc++-v3/testsuite/std/time/hh_mm_ss/1.cc
index d97a9057f472..26a4555576c8 100644
--- a/libstdc++-v3/testsuite/std/time/hh_mm_ss/1.cc
+++ b/libstdc++-v3/testsuite/std/time/hh_mm_ss/1.cc
@@ -103,7 +103,7 @@ size()
 {
   using namespace std::chrono;
 
-  struct S0 { long long h; char m; char s; bool neg; };
+  struct S0 { long long h; char m; char s; bool neg; struct { } empty; };
   static_assert(sizeof(hh_mm_ss<seconds>) == sizeof(S0));
   struct S1 { long long h; char m; char s; bool neg; char ss; };
   static_assert(sizeof(hh_mm_ss<duration<int, std::centi>>) == sizeof(S1));
-- 
2.30.2

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