From c3e637abffbe60c12aa57df84fdef797b1cbc5be Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Steffen=20M=C3=BCthing?= <muething@dune-project.org>
Date: Tue, 19 May 2015 14:30:40 +0200
Subject: [PATCH] [Release][CMake][Bugfix] Fail hard if we find nullptr, but
not std::nullptr_t
We do not really support this combination of C++11 features, and the
only time it should occur is when the user has a recent Intel Compiler
and an outdated GCC (which the Intel Compiler uses for the C++ standard
library). In that case, we emit a helpful error message at configuration
time.
---
cmake/modules/CheckCXX11Features.cmake | 28 +++++++++++++++++++++++++-
1 file changed, 27 insertions(+), 1 deletion(-)
diff --git a/cmake/modules/CheckCXX11Features.cmake b/cmake/modules/CheckCXX11Features.cmake
index 5a3a7b852..bf75b18f0 100644
--- a/cmake/modules/CheckCXX11Features.cmake
+++ b/cmake/modules/CheckCXX11Features.cmake
@@ -60,7 +60,33 @@ check_cxx_source_compiles("
return 0;
}
" HAVE_NULLPTR
-)
+ )
+
+if(HAVE_NULLPTR)
+ check_cxx_source_compiles("
+ #include <cstddef>
+
+ int main(void)
+ {
+ std::nullptr_t npt = nullptr;
+ return 0;
+ }
+" HAVE_NULLPTR_T
+ )
+ if (NOT HAVE_NULLPTR_T)
+ if(${CMAKE_CXX_COMPILER_ID} STREQUAL "Intel")
+ message(FATAL_ERROR "Your compiler supports the 'nullptr' keyword, but not the type std::nullptr_t.
+You are using an Intel compiler, where this error is typically caused by an outdated underlying system GCC.
+Check if 'gcc --version' gives you at least GCC 4.6, otherwise please install a newer GCC and point your Intel compiler at it using the '-gcc-name' or '-gxx-name' options (see 'man icc' for further details)."
+ )
+ else()
+ message(FATAL_ERROR "Your compiler supports the 'nullptr' keyword, but not the type std::nullptr_t.
+THIS SHOULD NOT HAPPEN FOR YOUR COMPILER!
+Please submit a bug at https://dune-project.org/flyspray/"
+ )
+ endif()
+ endif()
+endif()
# __attribute__((unused))
check_cxx_source_compiles("
--
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