Hi, Dinka, thanks for the patch.
On 14/02/17 21:22 +0000, Dinka Ranns wrote:
diff --git a/libstdc++-v3/include/std/chrono b/libstdc++-v3/include/std/chrono
index ceae7f8..6a6995c 100644
--- a/libstdc++-v3/include/std/chrono
+++ b/libstdc++-v3/include/std/chrono
@@ -349,50 +349,50 @@ _GLIBCXX_END_NAMESPACE_VERSION
operator-() const
{ return duration(-__r); }
- duration&
+ constexpr duration&
This needs to use _GLIBCXX17_CONSTEXPR instead of 'constexpr'
These functions aren't constexpr in C++11 and C++14, and the standard
(annoyingly) forbids us from adding constexpr anywhere it isn't
present in the standard.
The macro _GLIBCXX17_CONSTEXPR expands to 'constexpr' if __cplusplus >
201402L, and expands to nothing otherwise.
Each new 'constexpr' you've added needs to use that macro.
diff --git a/libstdc++-v3/testsuite/20_util/duration/arithmetic/constexpr.cc
b/libstdc++-v3/testsuite/20_util/duration/arithmetic/constexpr.cc
index 285f941..1128a52 100644
--- a/libstdc++-v3/testsuite/20_util/duration/arithmetic/constexpr.cc
+++ b/libstdc++-v3/testsuite/20_util/duration/arithmetic/constexpr.cc
@@ -19,11 +19,31 @@
#include <chrono>
#include <testsuite_common_types.h>
There should be a blank line before and after this function, however
...
+constexpr auto test_operators()
+{
+ std::chrono::nanoseconds d1 { };
+ d1++;
This new function uses C++14 return type deduction, so will fail if
the test is run in C++11 mode (the default is C++14, but it can be
overridden on the command-line).
+ ++d1;
+ d1--;
+ --d1;
Also once you change the new 'constexpr' specifiers to use the
_GLIBCXX17_CONSTEXPR macro this test will fail in C++14 mode. I think
this new function needs to be moved to a new test file, such as
testsuite/20_util/duration/arithmetic/constexpr_c++17.cc
That should contain just your new test_operators() function, because
the rest of the class will be tested by the existing constexpr.cc test
file. So something like:
// { dg-options "-std=gnu++17" }
// { dg-do compile { target c++1z } }
// Copyright etc. etc.
// ...
#include <chrono>
constexpr auto test_operators()
{
// ...
}
constexpr auto d4 = test_operators();
Note that the "dg-do compile" line should use the c++1z target instead
of c++11, and needs to override the default dialect with a dg-options
line.
This test doesn't need a "main" function because it's a "dg-do
compile" test, so isn't linked. (The existing test that you modified
didn't need one either, but it doesn't do any harm leaving it there).
diff --git a/libstdc++-v3/testsuite/20_util/time_point/arithmetic/constexpr.cc
b/libstdc++-v3/testsuite/20_util/time_point/arithmetic/constexpr.cc
new file mode 100644
index 0000000..e87a226
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/time_point/arithmetic/constexpr.cc
@@ -0,0 +1,39 @@
+// { dg-do compile { target c++11 } }
Since the time_point member functions will only be constexpr in C++17
this test also needs to use c++1z instead of c++11, and needs to
override the default C++14 dialect, i.e.
// { dg-options "-std=gnu++17" }
// { dg-do compile { target c++1z } }