diff options
Diffstat (limited to 'boost/predef/compiler/nvcc.h')
| -rw-r--r-- | boost/predef/compiler/nvcc.h | 35 |
1 files changed, 24 insertions, 11 deletions
diff --git a/boost/predef/compiler/nvcc.h b/boost/predef/compiler/nvcc.h index 3c35ef7cd8..4130539958 100644 --- a/boost/predef/compiler/nvcc.h +++ b/boost/predef/compiler/nvcc.h @@ -37,12 +37,30 @@ Version number available as major, minor, and patch beginning with version 7.5. #endif #ifdef BOOST_COMP_NVCC_DETECTION -# if defined(BOOST_PREDEF_DETAIL_COMP_DETECTED) -# define BOOST_COMP_NVCC_EMULATED BOOST_COMP_NVCC_DETECTION -# else -# undef BOOST_COMP_NVCC -# define BOOST_COMP_NVCC BOOST_COMP_NVCC_DETECTION -# endif +/* +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 @@ -53,8 +71,3 @@ Version number available as major, minor, and patch beginning with version 7.5. #include <boost/predef/detail/test.h> BOOST_PREDEF_DECLARE_TEST(BOOST_COMP_NVCC,BOOST_COMP_NVCC_NAME) - -#ifdef BOOST_COMP_NVCC_EMULATED -#include <boost/predef/detail/test.h> -BOOST_PREDEF_DECLARE_TEST(BOOST_COMP_NVCC_EMULATED,BOOST_COMP_NVCC_NAME) -#endif |