[committed] libstdc++: Fix some tests that fail with -fexcess-precision=standard

diff --git a/libstdc++-v3/testsuite/20_util/duration/cons/2.cc b/libstdc++-v3/testsuite/20_util/duration/cons/2.cc
index 95ec17be76e..4ee07a9a954 100644
--- a/libstdc++-v3/testsuite/20_util/duration/cons/2.cc
+++ b/libstdc++-v3/testsuite/20_util/duration/cons/2.cc
@@ -97,7 +97,7 @@  test01()
   duration<int, std::micro> d1_copy(d1);
   VERIFY(d1.count() * 1000 == d1_copy.count());
   
-  duration<double, std::micro> d2(8.0);
+  duration<double, std::micro> d2(85000);
   duration<double, std::milli> d2_copy(d2);
   VERIFY(d2.count() == d2_copy.count() * 1000.0);
   
@@ -105,7 +105,7 @@  test01()
   duration<int_emulator, std::micro> d3_copy(d3);
   VERIFY(d3.count() * 1000 == d3_copy.count());
   
-  duration<dbl_emulator, std::micro> d4(5.0);
+  duration<dbl_emulator, std::micro> d4(50000);
   duration<dbl_emulator, std::milli> d4_copy(d4);
   VERIFY(d4.count() == d4_copy.count() * dbl_emulator(1000.0));
 }
diff --git a/libstdc++-v3/testsuite/20_util/from_chars/5.cc b/libstdc++-v3/testsuite/20_util/from_chars/5.cc
index db0976c33d3..291ebf90fa0 100644
--- a/libstdc++-v3/testsuite/20_util/from_chars/5.cc
+++ b/libstdc++-v3/testsuite/20_util/from_chars/5.cc
@@ -44,7 +44,7 @@  test01()
       r = std::from_chars(s.data(), s.data() + s.length(), d, fmt);
       VERIFY( r.ec == std::errc::invalid_argument );
       VERIFY( r.ptr == s.data() );
-      VERIFY( d == 3.2 );
+      VERIFY( d == (double) 3.2 );
     }
   }
 
@@ -57,7 +57,7 @@  test01()
       r = std::from_chars(s.data(), s.data() + s.length(), d, fmt);
       VERIFY( r.ec == std::errc::invalid_argument );
       VERIFY( r.ptr == s.data() );
-      VERIFY( d == 3.2 );
+      VERIFY( d == (double) 3.2 );
     }
   }
 
@@ -69,7 +69,7 @@  test01()
 			std::chars_format::scientific);
     VERIFY( r.ec == std::errc::invalid_argument );
     VERIFY( r.ptr == s.data() );
-    VERIFY( d == 3.2 );
+    VERIFY( d == (double) 3.2 );
   }
 
   // patterns that are invalid without the final character
@@ -83,7 +83,7 @@  test01()
       r = std::from_chars(s.data(), s.data() + s.length() - 1, d, fmt);
       VERIFY( r.ec == std::errc::invalid_argument );
       VERIFY( r.ptr == s.data() );
-      VERIFY( d == 3.2 );
+      VERIFY( d == (double) 3.2 );
     }
   }
 }
diff --git a/libstdc++-v3/testsuite/20_util/from_chars/6.cc b/libstdc++-v3/testsuite/20_util/from_chars/6.cc
index 5a97bf6119a..1e3aa75becc 100644
--- a/libstdc++-v3/testsuite/20_util/from_chars/6.cc
+++ b/libstdc++-v3/testsuite/20_util/from_chars/6.cc
@@ -39,7 +39,7 @@  test01()
   VERIFY( res.ptr == s.data() + s.length() );
   // std::from_chars should ignore the current rounding mode
   // and always round to nearest.
-  VERIFY( d == 0.1 );
+  VERIFY( d == (double) 0.1 );
 #endif
 #endif
 }
diff --git a/libstdc++-v3/testsuite/20_util/variant/86874.cc b/libstdc++-v3/testsuite/20_util/variant/86874.cc
index 101056bc112..3e396b53311 100644
--- a/libstdc++-v3/testsuite/20_util/variant/86874.cc
+++ b/libstdc++-v3/testsuite/20_util/variant/86874.cc
@@ -39,9 +39,9 @@  test02()
 void
 test03()
 {
-  std::variant<double, int> v1{1}, v2{2.3};
+  std::variant<double, int> v1{1}, v2{0.5};
   std::swap(v1, v2);
-  VERIFY( std::get<double>(v1) == 2.3 );
+  VERIFY( std::get<double>(v1) == 0.5 );
   VERIFY( std::get<int>(v2) == 1 );
 }
 
diff --git a/libstdc++-v3/testsuite/25_algorithms/lower_bound/partitioned.cc b/libstdc++-v3/testsuite/25_algorithms/lower_bound/partitioned.cc
index 9e61337e2ad..557c1fada38 100644
--- a/libstdc++-v3/testsuite/25_algorithms/lower_bound/partitioned.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/lower_bound/partitioned.cc
@@ -84,10 +84,10 @@  test02()
 
   auto part3 = std::lower_bound(c.begin(), c.end(), Y{1.0});
   VERIFY( part3 != c.end() );
-  VERIFY( part3->val == 1.2 );
+  VERIFY( part3->val == seq[1].val );
   auto part4 = std::lower_bound(c.begin(), c.end(), Y{1.0}, std::less<Y>{});
   VERIFY( part4 != c.end() );
-  VERIFY( part4->val == 1.2 );
+  VERIFY( part4->val == seq[1].val );
 }
 
 int
diff --git a/libstdc++-v3/testsuite/26_numerics/random/discrete_distribution/cons/range.cc b/libstdc++-v3/testsuite/26_numerics/random/discrete_distribution/cons/range.cc
index 75db9670845..440fdc45686 100644
--- a/libstdc++-v3/testsuite/26_numerics/random/discrete_distribution/cons/range.cc
+++ b/libstdc++-v3/testsuite/26_numerics/random/discrete_distribution/cons/range.cc
@@ -33,8 +33,8 @@  test01()
   std::discrete_distribution<> u(wt.begin(), wt.end());
   std::vector<double> probablility = u.probabilities();
   VERIFY( probablility.size() == 5 );
-  VERIFY( probablility[0] == 0.5 / 6.0 );
-  VERIFY( probablility[2] == 2.5 / 6.0 );
+  VERIFY( probablility[0] == double(0.5 / 6.0) );
+  VERIFY( probablility[2] == double(2.5 / 6.0) );
 }
 
 int main()
diff --git a/libstdc++-v3/testsuite/26_numerics/random/piecewise_constant_distribution/cons/range.cc b/libstdc++-v3/testsuite/26_numerics/random/piecewise_constant_distribution/cons/range.cc
index 114a5eea827..b9f4f733fa1 100644
--- a/libstdc++-v3/testsuite/26_numerics/random/piecewise_constant_distribution/cons/range.cc
+++ b/libstdc++-v3/testsuite/26_numerics/random/piecewise_constant_distribution/cons/range.cc
@@ -38,8 +38,8 @@  test01()
   VERIFY( interval[0] == 0.0 );
   VERIFY( interval[5] == 5.0 );
   VERIFY( density.size() == 5 );
-  VERIFY( density[0] == 0.5 / 6.0 );
-  VERIFY( density[2] == 2.5 / 6.0 );
+  VERIFY( density[0] == double(0.5 / 6.0) );
+  VERIFY( density[2] == double(2.5 / 6.0) );
 }
 
 int main()
diff --git a/libstdc++-v3/testsuite/26_numerics/random/piecewise_linear_distribution/cons/range.cc b/libstdc++-v3/testsuite/26_numerics/random/piecewise_linear_distribution/cons/range.cc
index 01e291cd20e..95650b19d5e 100644
--- a/libstdc++-v3/testsuite/26_numerics/random/piecewise_linear_distribution/cons/range.cc
+++ b/libstdc++-v3/testsuite/26_numerics/random/piecewise_linear_distribution/cons/range.cc
@@ -39,7 +39,7 @@  test01()
   VERIFY( interval[5] == 5.0 );
   VERIFY( density.size() == 6 );
   VERIFY( density[0] == 0.0 );
-  VERIFY( density[4] == 3.5 / 8.5 );
+  VERIFY( density[4] == double(3.5 / 8.5) );
 }
 
 int main()
diff --git a/libstdc++-v3/testsuite/26_numerics/valarray/transcend.cc b/libstdc++-v3/testsuite/26_numerics/valarray/transcend.cc
index 82884673110..19a17f3d8ab 100644
--- a/libstdc++-v3/testsuite/26_numerics/valarray/transcend.cc
+++ b/libstdc++-v3/testsuite/26_numerics/valarray/transcend.cc
@@ -22,7 +22,7 @@ 
 
 bool eq(double d, double e)
 {
-  return (int)(d * 100) == (int)(e * 100);
+  return std::abs(d - e) < 0.01;
 }
 
 void
diff --git a/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/01.cc b/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/01.cc
index 78b6aaaf67f..cdb437c4c91 100644
--- a/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/01.cc
+++ b/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/01.cc
@@ -92,7 +92,7 @@  void test01() {
   is_03 >> ld1;
   VERIFY( ld1 == 66300.25 );
   is_03 >> d1;
-  VERIFY( d1 == .315 );
+  VERIFY( d1 == (double) .315 ); // N.B. cast removes excess precision
   is_03 >> f1;
   VERIFY( f1 == 1.5 );
 
diff --git a/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/09.cc b/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/09.cc
index dd6d2dffc9d..4ed4169a3f7 100644
--- a/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/09.cc
+++ b/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/09.cc
@@ -37,7 +37,7 @@  void test09()
   (is>>std::ws) >> c;
   (is>>std::ws) >> f2;
   VERIFY( f1 == 2456 );
-  VERIFY( f2 == 0.00567 );
+  VERIFY( f2 == (double) 0.00567 ); // N.B. cast removes excess precision
   VERIFY( c == '-' );
 }
 
diff --git a/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/10.cc b/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/10.cc
index 3c73734cd23..9cf76ff37b2 100644
--- a/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/10.cc
+++ b/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/10.cc
@@ -95,7 +95,7 @@  void test10()
   VERIFY( f == 450.0 );
   is_04.ignore();
   is_04 >> f;
-  VERIFY( f == 0.005 );
+  VERIFY( f == (double) 0.005 ); // N.B. cast removes excess precision
   is_04 >> f;
   VERIFY( f == 6 );
   VERIFY( is_03.rdstate() == std::ios_base::eofbit );
diff --git a/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/01.cc b/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/01.cc
index 843dfbaccfa..6cfa476fc46 100644
--- a/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/01.cc
+++ b/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/01.cc
@@ -90,7 +90,7 @@  void test01() {
   is_03 >> ld1;
   VERIFY( ld1 == 66300.25 );
   is_03 >> d1;
-  VERIFY( d1 == .315 );
+  VERIFY( d1 == (double) .315 ); // N.B. cast removes excess precision
   is_03 >> f1;
   VERIFY( f1 == 1.5 );
 
diff --git a/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/09.cc b/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/09.cc
index 8c614197faf..511a33cb21a 100644
--- a/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/09.cc
+++ b/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/09.cc
@@ -35,7 +35,7 @@  void test09()
   (is >> std::ws) >> c;
   (is >> std::ws) >> f2;
   VERIFY( f1 == 2456 );
-  VERIFY( f2 == 0.00567 );
+  VERIFY( f2 == (double) 0.00567 ); // N.B. cast removes excess precision
   VERIFY( c == L'-' );
 }
 
diff --git a/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/10.cc b/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/10.cc
index 3be2b023b5f..f2da3edea48 100644
--- a/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/10.cc
+++ b/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/10.cc
@@ -93,7 +93,7 @@  void test10()
   VERIFY( f == 450.0 );
   is_04.ignore();
   is_04 >> f;
-  VERIFY( f == 0.005 );
+  VERIFY( f == (double) 0.005 ); // N.B. cast removes excess precision
   is_04 >> f;
   VERIFY( f == 6 );
   VERIFY( is_03.rdstate() == std::ios_base::eofbit );
diff --git a/libstdc++-v3/testsuite/ext/random/hoyt_distribution/cons/parms.cc b/libstdc++-v3/testsuite/ext/random/hoyt_distribution/cons/parms.cc
index 58d880a12d9..12af5f42450 100644
--- a/libstdc++-v3/testsuite/ext/random/hoyt_distribution/cons/parms.cc
+++ b/libstdc++-v3/testsuite/ext/random/hoyt_distribution/cons/parms.cc
@@ -27,7 +27,7 @@  void
 test01()
 {
   __gnu_cxx::hoyt_distribution<> u(0.05, 3.0);
-  VERIFY( u.q() == 0.05 );
+  VERIFY( u.q() == (double) 0.05 );
   VERIFY( u.omega() == 3.0 );
   VERIFY( u.min() == 0.0 );
   typedef __gnu_cxx::hoyt_distribution<>::result_type result_type;