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

libstdc++-v3/ChangeLog:

	* testsuite/20_util/duration/cons/2.cc: Use values that aren't
	affected by rounding.
	* testsuite/20_util/from_chars/5.cc: Cast arithmetic result to
	double before comparing for equality.
	* testsuite/20_util/from_chars/6.cc: Likewise.
	* testsuite/20_util/variant/86874.cc: Use values that aren't
	affected by rounding.
	* testsuite/25_algorithms/lower_bound/partitioned.cc: Compare to
	original value instead of to floating-point-literal.
	* testsuite/26_numerics/random/discrete_distribution/cons/range.cc:
	Cast arithmetic result to double before comparing for equality.
	* testsuite/26_numerics/random/piecewise_constant_distribution/cons/range.cc:
	Likewise.
	* testsuite/26_numerics/random/piecewise_linear_distribution/cons/range.cc:
	Likewise.
	* testsuite/26_numerics/valarray/transcend.cc (eq): Check that
	the absolute difference is less than 0.01 instead of comparing
	to two decimal places.
	* testsuite/27_io/basic_istream/extractors_arithmetic/char/01.cc:
	Cast arithmetic result to double before comparing for equality.
	* testsuite/27_io/basic_istream/extractors_arithmetic/char/09.cc:
	Likewise.
	* testsuite/27_io/basic_istream/extractors_arithmetic/char/10.cc:
	Likewise.
	* testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/01.cc:
	Likewise.
	* testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/09.cc:
	Likewise.
	* testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/10.cc:
	Likewise.
	* testsuite/ext/random/hoyt_distribution/cons/parms.cc: Likewise.

6 files changed, 6 insertions, 6 deletions

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 78b6aaa..cdb437c 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 dd6d2df..4ed4169 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 3c73734..9cf76ff 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 843dfba..6cfa476 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 8c61419..511a33c 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 3be2b02..f2da3ed 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 );