[PATCH v2] libstdc++: Mark gencanon_eng_neg test as unsupported if __float128 is not available.

[Tomasz Kamiński]

As DejaGnu reads all lines, the { dg-error } still expected error,
even if the code was removed by preprocessor checks.

libstdc++-v3/ChangeLog:

	* testsuite/26_numerics/random/uniform_real_distribution/operators/gencanon_eng_neg.cc:
	Removed preprocessor checks, add dg-require-effective-target.
---
Used combination of the flags that are used for core test.
Rainer could you check if the test now is properly marked as
unsupported for you?

The test is still runnin on x86_64-linux, also with -m32.

 .../operators/gencanon_eng_neg.cc              | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/libstdc++-v3/testsuite/26_numerics/random/uniform_real_distribution/operators/gencanon_eng_neg.cc b/libstdc++-v3/testsuite/26_numerics/random/uniform_real_distribution/operators/gencanon_eng_neg.cc
index 8b241fee7ed..e3b4540bf2b 100644
--- a/libstdc++-v3/testsuite/26_numerics/random/uniform_real_distribution/operators/gencanon_eng_neg.cc
+++ b/libstdc++-v3/testsuite/26_numerics/random/uniform_real_distribution/operators/gencanon_eng_neg.cc
@@ -1,4 +1,7 @@
 // { dg-do compile { target { c++11 } } }
+// { dg-require-effective-target __float128 }
+// { dg-require-effective-target base_quadfloat_support }
+// { dg-add-options __float128 }
 
 #include <random>
 #include <cstdint>
@@ -45,13 +48,12 @@ test_pow2()
 
 int main()
 {
-// For 128bit floating points, generator emitting a range, which size is 
-// not power of two, but of width of B bits, such that for any N:
-// N * B < 113 (bits in ieee128)
-// (N+1) * B > 128
-// are not supported, as they would require integer with more than 127 bits.
-#ifndef _GLIBCXX_GENERATE_CANONICAL_STRICT
-#  ifdef __SIZEOF_FLOAT128__
+  // For 128bit floating points, generator emitting a range, which size is 
+  // not power of two, but of width of B bits, such that for any N:
+  // N * B < 113 (bits in ieee128)
+  // (N+1) * B > 128
+  // are not supported, as they would require integer with more than 127 bits.
+
   // N == 3: B in [43, 57)
   test_non_pow2<__float128, 42>(); // 3 calls
   test_non_pow2<__float128, 43>(); // { dg-error "from here" }
@@ -81,8 +83,6 @@ int main()
   test_non_pow2<__float128, 22>(); // { dg-error "from here" }
   test_non_pow2<__float128, 23>(); // 5 calls
   test_pow2<__float128, 22>();
-#  endif
-#endif 
 }
 
 // { dg-prune-output "no type named 'type' in 'struct std::__detail::_Select_uint_least_t" }
-- 
2.54.0