整理

include/boost/predef/compiler/nvcc.h

@@ -0,0 +1,74 @@
+/*
+Copyright Benjamin Worpitz 2018
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE_1_0.txt or copy at
+http://www.boost.org/LICENSE_1_0.txt)
+*/
+
+#ifndef BOOST_PREDEF_COMPILER_NVCC_H
+#define BOOST_PREDEF_COMPILER_NVCC_H
+
+#include <boost/predef/version_number.h>
+#include <boost/predef/make.h>
+
+/* tag::reference[]
+= `BOOST_COMP_NVCC`
+
+https://en.wikipedia.org/wiki/NVIDIA_CUDA_Compiler[NVCC] compiler.
+Version number available as major, minor, and patch beginning with version 7.5.
+
+[options="header"]
+|===
+| {predef_symbol} | {predef_version}
+
+| `+__NVCC__+` | {predef_detection}
+
+| `+__CUDACC_VER_MAJOR__+`, `+__CUDACC_VER_MINOR__+`, `+__CUDACC_VER_BUILD__+` | V.R.P
+|===
+*/ // end::reference[]
+
+#define BOOST_COMP_NVCC BOOST_VERSION_NUMBER_NOT_AVAILABLE
+
+#if defined(__NVCC__)
+#   if !defined(__CUDACC_VER_MAJOR__) || !defined(__CUDACC_VER_MINOR__) || !defined(__CUDACC_VER_BUILD__)
+#       define BOOST_COMP_NVCC_DETECTION BOOST_VERSION_NUMBER_AVAILABLE
+#   else
+#       define BOOST_COMP_NVCC_DETECTION BOOST_VERSION_NUMBER(__CUDACC_VER_MAJOR__, __CUDACC_VER_MINOR__, __CUDACC_VER_BUILD__)
+#   endif
+#endif
+
+#ifdef BOOST_COMP_NVCC_DETECTION
+/*
+Always define BOOST_COMP_NVCC instead of BOOST_COMP_NVCC_EMULATED
+The nvcc compilation process is somewhat special as can be read here:
+https://docs.nvidia.com/cuda/cuda-compiler-driver-nvcc/index.html#cuda-compilation-trajectory
+The nvcc compiler precompiles the input two times. Once for the device code
+being compiled by the cicc device compiler and once for the host code
+compiled by the real host compiler. NVCC uses gcc/clang/msvc/...
+depending on the host compiler being set on the command line.
+
+Predef (as a preprocessor only lib) detects the one doing the preprocessing
+as compiler and expects it to be the one doing the real compilation.
+This is not true for NVCC which is only doing the preprocessing and which
+is using another compiler for parts of its work. So for NVCC it should be
+allowed to set BOOST_COMP_NVCC additionally to the already detected host
+compiler because both is true: It is gcc/clang/... compiling the code, but it
+is also NVCC doing the preprocessing and adding some other quirks you may
+want to detect.
+
+This behavior is similar to what boost config is doing in `select_compiler_config.hpp`.
+There the NVCC detection is not handled as a real compiler (part of the
+#if-#elif) but as additional option before the real compiler.
+*/
+#   undef BOOST_COMP_NVCC
+#   define BOOST_COMP_NVCC BOOST_COMP_NVCC_DETECTION
+#   define BOOST_COMP_NVCC_AVAILABLE
+#   include <boost/predef/detail/comp_detected.h>
+#endif
+
+#define BOOST_COMP_NVCC_NAME "NVCC"
+
+#endif
+
+#include <boost/predef/detail/test.h>
+BOOST_PREDEF_DECLARE_TEST(BOOST_COMP_NVCC,BOOST_COMP_NVCC_NAME)