Features: Record for SunPro 5.15

Oracle Developer Studio 12.6 adds support for more C++ 11 features.

Help/manual/cmake-compile-features.7.rst

@@ -335,7 +335,7 @@ versions specified for each:
 * ``Clang``: Clang compiler versions 2.9 through 3.4.
 * ``GNU``: GNU compiler versions 4.4 through 5.0.
 * ``MSVC``: Microsoft Visual Studio versions 2010 through 2017.
-* ``SunPro``: Oracle SolarisStudio versions 12.4 through 12.5.
+* ``SunPro``: Oracle SolarisStudio versions 12.4 through 12.6.
 * ``Intel``: Intel compiler versions 12.1 through 17.0.
 
 CMake is currently aware of the :prop_tgt:`C standards <C_STANDARD>`

Modules/Compiler/SunPro-CXX-FeatureTests.cmake

@@ -1,10 +1,14 @@
 
 # Based on GNU 4.8.2
-# http://docs.oracle.com/cd/E37069_01/html/E37071/gncix.html
+# https://docs.oracle.com/cd/E37069_01/html/E37071/gncix.html
+# https://docs.oracle.com/cd/E77782_01/html/E77784/gkeza.html
 # Reference: http://gcc.gnu.org/projects/cxx0x.html
 
 set(_cmake_oldestSupported "__SUNPRO_CC >= 0x5130")
 
+set(SolarisStudio126_CXX11 "(__SUNPRO_CC >= 0x5150) && __cplusplus >= 201103L")
+set(_cmake_feature_test_cxx_decltype_auto "${SolarisStudio126_CXX11}")
+
 set(SolarisStudio125_CXX11 "(__SUNPRO_CC >= 0x5140) && __cplusplus >= 201103L")
 set(_cmake_feature_test_cxx_binary_literals "${SolarisStudio125_CXX11}")
 set(_cmake_feature_test_cxx_reference_qualified_functions "${SolarisStudio125_CXX11}")