[gcc r12-1941] libstdc++: Suppress redundant definitions of static members in <random>

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

https://gcc.gnu.org/g:996be6b670b9f85727a6ae98c8095ca9cfbc0f67

commit r12-1941-g996be6b670b9f85727a6ae98c8095ca9cfbc0f67
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Jun 30 15:47:41 2021 +0100

    libstdc++: Suppress redundant definitions of static members in <random>
    
    Since C++17 the static members of the random number engines are
    implicitly inline, so don't need definitions.
    
    Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/random.tcc [__cpp_inline_variables]: Remove
            redundant definitions of static constexpr member variables.
            * testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error
            line number.

Diff:
---
 libstdc++-v3/include/bits/random.tcc                     | 12 ++++++++----
 libstdc++-v3/testsuite/26_numerics/random/pr60037-neg.cc |  2 +-
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/libstdc++-v3/include/bits/random.tcc b/libstdc++-v3/include/bits/random.tcc
index 8e2b702b0be..f28163ec03d 100644
--- a/libstdc++-v3/include/bits/random.tcc
+++ b/libstdc++-v3/include/bits/random.tcc
@@ -186,7 +186,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       return __is;
     }
 
-
+#if ! __cpp_inline_variables
   template<typename _UIntType,
 	   size_t __w, size_t __n, size_t __m, size_t __r,
 	   _UIntType __a, size_t __u, _UIntType __d, size_t __s,
@@ -313,6 +313,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     constexpr _UIntType
     mersenne_twister_engine<_UIntType, __w, __n, __m, __r, __a, __u, __d,
 			    __s, __b, __t, __c, __l, __f>::default_seed;
+#endif
 
   template<typename _UIntType,
 	   size_t __w, size_t __n, size_t __m, size_t __r,
@@ -515,7 +516,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       return __is;
     }
 
-
+#if ! __cpp_inline_variables
   template<typename _UIntType, size_t __w, size_t __s, size_t __r>
     constexpr size_t
     subtract_with_carry_engine<_UIntType, __w, __s, __r>::word_size;
@@ -531,6 +532,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _UIntType, size_t __w, size_t __s, size_t __r>
     constexpr _UIntType
     subtract_with_carry_engine<_UIntType, __w, __s, __r>::default_seed;
+#endif
 
   template<typename _UIntType, size_t __w, size_t __s, size_t __r>
     void
@@ -666,7 +668,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       return __is;
     }
 
-
+#if ! __cpp_inline_variables
   template<typename _RandomNumberEngine, size_t __p, size_t __r>
     constexpr size_t
     discard_block_engine<_RandomNumberEngine, __p, __r>::block_size;
@@ -674,6 +676,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _RandomNumberEngine, size_t __p, size_t __r>
     constexpr size_t
     discard_block_engine<_RandomNumberEngine, __p, __r>::used_block;
+#endif
 
   template<typename _RandomNumberEngine, size_t __p, size_t __r>
     typename discard_block_engine<_RandomNumberEngine,
@@ -799,10 +802,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       return __sum;
     }
 
-
+#if ! __cpp_inline_variables
   template<typename _RandomNumberEngine, size_t __k>
     constexpr size_t
     shuffle_order_engine<_RandomNumberEngine, __k>::table_size;
+#endif
 
   namespace __detail
   {
diff --git a/libstdc++-v3/testsuite/26_numerics/random/pr60037-neg.cc b/libstdc++-v3/testsuite/26_numerics/random/pr60037-neg.cc
index ba252ef34fe..ae03b5693c2 100644
--- a/libstdc++-v3/testsuite/26_numerics/random/pr60037-neg.cc
+++ b/libstdc++-v3/testsuite/26_numerics/random/pr60037-neg.cc
@@ -12,4 +12,4 @@ auto x = std::generate_canonical<std::size_t,
 
 // { dg-error "static assertion failed: template argument must be a floating point type" "" { target *-*-* } 167 }
 
-// { dg-error "static assertion failed: template argument must be a floating point type" "" { target *-*-* } 3346 }
+// { dg-error "static assertion failed: template argument must be a floating point type" "" { target *-*-* } 3350 }