Define "random_device" effective target

Currently only matches targets where _GLIBCXX_USE_RANDOM_TR1 is defined,
which means /dev/random and /dev/urandom are usable.

	* testsuite/25_algorithms/make_heap/complexity.cc: Require effective
	target for std::random_device.
	* testsuite/26_numerics/random/random_device/cons/default.cc:
	Likewise.
	* testsuite/experimental/algorithm/sample-2.cc: Likewise.
	* testsuite/experimental/algorithm/shuffle.cc: Likewise.
	* testsuite/experimental/random/randint.cc: Likewise.
	* testsuite/lib/libstdc++.exp
	(check_effective_target_random_device): New proc.

From-SVN: r262415

7 files changed, 45 insertions, 0 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index b1747e8..24acd68 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,4 +1,16 @@
 2018-07-04  Jonathan Wakely  <jwakely@redhat.com>
+
+	* testsuite/25_algorithms/make_heap/complexity.cc: Require effective
+	target for std::random_device.
+	* testsuite/26_numerics/random/random_device/cons/default.cc:
+	Likewise.
+	* testsuite/experimental/algorithm/sample-2.cc: Likewise.
+	* testsuite/experimental/algorithm/shuffle.cc: Likewise.
+	* testsuite/experimental/random/randint.cc: Likewise.
+	* testsuite/lib/libstdc++.exp
+	(check_effective_target_random_device): New proc.
+
+2018-07-04  Jonathan Wakely  <jwakely@redhat.com>
 	    Jakub Jelinek  <jakub@redhat.com>
 
 	* include/std/bit (__rotl, __rotr): Fix for non-power of two sizes.
diff --git a/libstdc++-v3/testsuite/25_algorithms/make_heap/complexity.cc b/libstdc++-v3/testsuite/25_algorithms/make_heap/complexity.cc
index cca48f6..069d2d0 100644
--- a/libstdc++-v3/testsuite/25_algorithms/make_heap/complexity.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/make_heap/complexity.cc
@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-do run { target c++11 } }
+// { dg-require-effective-target random_device }
 
 #include <random>
 #include <vector>
diff --git a/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/default.cc b/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/default.cc
index 3821096..5a34526 100644
--- a/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/default.cc
+++ b/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/default.cc
@@ -1,4 +1,5 @@
 // { dg-do run { target c++11 } }
+// { dg-require-effective-target random_device }
 // { dg-require-cstdint "" }
 //
 // 2008-11-24  Edward M. Smith-Rowland <3dw4rd@verizon.net>
diff --git a/libstdc++-v3/testsuite/experimental/algorithm/sample-2.cc b/libstdc++-v3/testsuite/experimental/algorithm/sample-2.cc
index 541d17e..ef3f7da 100644
--- a/libstdc++-v3/testsuite/experimental/algorithm/sample-2.cc
+++ b/libstdc++-v3/testsuite/experimental/algorithm/sample-2.cc
@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-do run { target c++14 } }
+// { dg-require-effective-target random_device }
 // { dg-require-effective-target tls_runtime }
 // { dg-add-options tls }
 
diff --git a/libstdc++-v3/testsuite/experimental/algorithm/shuffle.cc b/libstdc++-v3/testsuite/experimental/algorithm/shuffle.cc
index ee06fbd..db958f6 100644
--- a/libstdc++-v3/testsuite/experimental/algorithm/shuffle.cc
+++ b/libstdc++-v3/testsuite/experimental/algorithm/shuffle.cc
@@ -1,4 +1,5 @@
 // { dg-do run { target c++14 } }
+// { dg-require-effective-target random_device }
 // { dg-require-effective-target tls_runtime }
 // { dg-add-options tls }
 
diff --git a/libstdc++-v3/testsuite/experimental/random/randint.cc b/libstdc++-v3/testsuite/experimental/random/randint.cc
index e80bd85..90ba72a 100644
--- a/libstdc++-v3/testsuite/experimental/random/randint.cc
+++ b/libstdc++-v3/testsuite/experimental/random/randint.cc
@@ -1,4 +1,5 @@
 // { dg-do run { target c++14 } }
+// { dg-require-effective-target random_device }
 // { dg-require-effective-target tls_runtime }
 // { dg-add-options tls }
 
diff --git a/libstdc++-v3/testsuite/lib/libstdc++.exp b/libstdc++-v3/testsuite/lib/libstdc++.exp
index 7af3266..d8717e4 100644
--- a/libstdc++-v3/testsuite/lib/libstdc++.exp
+++ b/libstdc++-v3/testsuite/lib/libstdc++.exp
@@ -2061,6 +2061,34 @@ proc check_effective_target_cxx11-abi { } {
     return 0
 }
 
+# Return 1 if std::random_device should be usable using the current flags, 0 otherwise.
+proc check_effective_target_random_device { } {
+    global cxxflags
+
+    # Set up and preprocess a C++ test program that depends
+    # on std::random_device being usable.
+    set src random_device[pid].cc
+
+    set f [open $src "w"]
+    puts $f "#include <bits/c++config.h>"
+    puts $f "#if ! _GLIBCXX_USE_RANDOM_TR1"
+    puts $f "#  error No working std::random_device available"
+    puts $f "#endif"
+    close $f
+
+    set lines [v3_target_compile $src /dev/null preprocess ""]
+    file delete $src
+
+    if [string match "" $lines] {
+	# No error message, preprocessing succeeded.
+	verbose "check_v3_random_device: `1'" 2
+	return 1
+    }
+
+    verbose "check_v3_random_device: `0'" 2
+    return 0
+}
+
 set additional_prunes ""
 
 if { [info exists env(GCC_RUNTEST_PARALLELIZE_DIR)] \