+#
+# This file is part of the GROMACS molecular simulation package.
+#
+# Copyright (c) 2012,2013,2014, by the GROMACS development team, led by
+# Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
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+#
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+
# Manage CUDA nvcc compilation configuration, try to be smart to ease the users'
# pain as much as possible:
-# - use the CUDA_NVCC_HOST_COMPILER if defined by the user, otherwise
+# - use the CUDA_HOST_COMPILER if defined by the user, otherwise
# - auto-detect compatible nvcc host compiler and set nvcc -ccbin (if not MPI wrapper)
# - set icc compatibility mode to gcc 4.4/4.5 (CUDA 4.0 is not compatible with gcc >v4.4)
# - (advanced) variables set:
-# * CUDA_NVCC_HOST_COMPILER - the compiler nvcc is forced to use (via -ccbin)
-# * CUDA_NVCC_HOST_COMPILER_OPTIONS - the full host-compiler related option list passed to nvcc
+# * CUDA_HOST_COMPILER - the host compiler for nvcc (only with cmake <2.8.10)
+# * CUDA_HOST_COMPILER_OPTIONS - the full host-compiler related option list passed to nvcc
+#
+# Note that from CMake 2.8.10 FindCUDA defines CUDA_HOST_COMPILER internally,
+# so we won't set it ourselves, but hope that the module does a good job.
+
if (NOT DEFINED CUDA_NVCC_FLAGS_SET)
set(CUDA_NVCC_FLAGS_SET TRUE CACHE INTERNAL "True if NVCC flags have been set" FORCE)
# Also note that with MSVC nvcc sets the -compiler-bindir option behind the
# scenes; to avoid conflicts we don't set -ccbin automatically.
- if (NOT DEFINED CUDA_NVCC_HOST_COMPILER AND NOT MSVC)
+ if (NOT DEFINED CUDA_HOST_COMPILER AND NOT MSVC)
if (NOT CMAKE_COMPILER_IS_GNUCC AND
NOT (CMAKE_C_COMPILER_ID MATCHES "Intel" AND UNIX AND NOT APPLE))
message(WARNING "
Will not set the nvcc host compiler because the current C compiler is not
compatible with nvcc:
${CMAKE_C_COMPILER} (ID: ${CMAKE_C_COMPILER_ID})
- Compatible compilers are: gcc on Linux and Mac OS X, the Intel Compiler on
- 64-bit Linux and MSVC on Windows. If nothing specified, nvcc will automatically
- pick the platform-default compiler; However, as mixing compilers can cause errors.
+ Compatible compilers are: gcc on Linux and Mac OS X, the Intel Compiler on 64-bit
+ Linux and MSVC on Windows. Note that with newer CUDA releases this might change,
+ for up-to-date compatibility information check the NVIDIA documentation.
+ If nothing specified, nvcc will automatically pick the platform-default compiler;
+ Note that mixing compilers can cause errors.
To manually set the nvcc host compiler, edit CUDA_NVCC_FLAGS or re-configure
- setting CUDA_NVCC_HOST_COMPILER to the full path of a compatible compiler.
+ setting CUDA_HOST_COMPILER to the full path of a compatible compiler.
")
else()
# do not use MPI compiler wrappers, as these are prone to brake nvcc
but the safest is to use the C compiler that the MPI compiler wrapper uses
(if this is compatible).
To manually set the nvcc host compiler, edit CUDA_NVCC_FLAGS or re-configure
- setting CUDA_NVCC_HOST_COMPILER to the full path of a compatible compiler.
+ setting CUDA_HOST_COMPILER to the full path of a compatible compiler.
")
else()
- set(CUDA_NVCC_HOST_COMPILER "${CMAKE_C_COMPILER}")
- set(CUDA_NVCC_HOST_COMPILER_AUTOSET TRUE CACHE INTERNAL
- "True if CUDA_NVCC_HOST_COMPILER is automatically set" FORCE)
+ set(CUDA_HOST_COMPILER "${CMAKE_C_COMPILER}")
+ set(CUDA_HOST_COMPILER_AUTOSET TRUE CACHE INTERNAL
+ "True if CUDA_HOST_COMPILER is automatically set" FORCE)
endif()
endif()
endif()
- if(DEFINED CUDA_NVCC_HOST_COMPILER)
- message(STATUS "Setting the nvcc host compiler to: ${CUDA_NVCC_HOST_COMPILER}")
- set(CUDA_NVCC_HOST_COMPILER ${CUDA_NVCC_HOST_COMPILER}
- CACHE PATH "Host compiler for nvcc (do not edit!)" FORCE)
+ if(DEFINED CUDA_HOST_COMPILER)
+ # FindCUDA in CMake 2.8.10 sets the host compiler internally
+ if (CMAKE_VERSION VERSION_LESS "2.8.10")
+ message(STATUS "Setting the nvcc host compiler to: ${CUDA_HOST_COMPILER}")
+ set(CUDA_HOST_COMPILER ${CUDA_HOST_COMPILER}
+ CACHE PATH "Host compiler for nvcc (do not edit!)" FORCE)
+ set(_HOST_COMPILER_OPTION_STRING "-ccbin=${CUDA_HOST_COMPILER};")
+ endif()
- set(CUDA_NVCC_HOST_COMPILER_OPTIONS "-ccbin=${CUDA_NVCC_HOST_COMPILER}")
- # On *nix force icc in gcc 4.4 compatibility with CUDA 3.2/4.0 and
+ # On *nix force icc in gcc 4.4 compatibility mode with CUDA 3.2/4.0 and
# gcc 4.5 compatibility mode with later CUDA versions. This is needed
- # as even with icc use as host compiler, when icc's gcc compatibility
+ # as even with icc used as host compiler, when icc's gcc compatibility
# mode is higher than the max gcc version officially supported by CUDA,
# nvcc will freak out.
if (UNIX AND CMAKE_C_COMPILER_ID MATCHES "Intel" AND
- CUDA_NVCC_HOST_COMPILER_AUTOSET)
+ CUDA_HOST_COMPILER_AUTOSET)
if (CUDA_VERSION VERSION_LESS "4.1")
message(STATUS "Setting Intel Compiler compatibity mode to gcc 4.4 for nvcc host compilation")
- set(CUDA_NVCC_HOST_COMPILER_OPTIONS "${CUDA_NVCC_HOST_COMPILER_OPTIONS};-Xcompiler;-gcc-version=440;")
+ set(CUDA_HOST_COMPILER_OPTIONS "${CUDA_HOST_COMPILER_OPTIONS};-Xcompiler;-gcc-version=440;")
else()
message(STATUS "Setting Intel Compiler compatibity mode to gcc 4.5 for nvcc host compilation")
- set(CUDA_NVCC_HOST_COMPILER_OPTIONS "${CUDA_NVCC_HOST_COMPILER_OPTIONS};-Xcompiler;-gcc-version=450;")
+ set(CUDA_HOST_COMPILER_OPTIONS "${CUDA_HOST_COMPILER_OPTIONS};-Xcompiler;-gcc-version=450;")
endif()
endif()
- set(CUDA_NVCC_HOST_COMPILER_OPTIONS "${CUDA_NVCC_HOST_COMPILER_OPTIONS}"
- CACHE STRING "Host-side compiler and options for it (do not edit!)." FORCE)
+ set(CUDA_HOST_COMPILER_OPTIONS "${CUDA_HOST_COMPILER_OPTIONS}"
+ CACHE STRING "Options for nvcc host compiler (do not edit!)." FORCE)
- mark_as_advanced(CUDA_NVCC_HOST_COMPILER CUDA_NVCC_HOST_COMPILER_OPTIONS)
+ mark_as_advanced(CUDA_HOST_COMPILER CUDA_HOST_COMPILER_OPTIONS)
endif()
- # on Linux we need to add -fPIC when building shared gmx libs
- # Note: will add -fPIC for any compiler that supports it as it shouldn't hurt
- if(BUILD_SHARED_LIBS)
- GMX_TEST_CXXFLAG(CXXFLAG_FPIC "-fPIC" _FPIC_NVCC_FLAG)
- if(_FPIC_NVCC_FLAG)
- set(_FPIC_NVCC_FLAG "-Xcompiler;${_FPIC_NVCC_FLAG}")
- endif()
+ if(APPLE AND CMAKE_C_COMPILER_ID MATCHES "GNU")
+ # Some versions of gcc-4.8 and gcc-4.9 produce errors (in particular on OS X)
+ # if we do not use -D__STRICT_ANSI__. It is harmless, so we might as well add it for all versions.
+ set(CUDA_HOST_COMPILER_OPTIONS "${CUDA_HOST_COMPILER_OPTIONS}-D__STRICT_ANSI__;")
+ endif()
+
+ # the legacy CUDA kernels have been dropped, warn with CUDA 4.0
+ if (CUDA_VERSION VERSION_EQUAL "4.0")
+ message(WARNING "The legacy GPU kernels optimized for older CUDA compilers, including the detected version 4.0, have been removed. To avoid performance loss, we strongly recommend upgrading to a newer CUDA toolkit.
+ ")
endif()
# Set the CUDA GPU architectures to compile for:
# - with CUDA >v4.2 compute capability 2.0, 2.1 is, but 3.0 is not supported:
# => compile sm_20, sm_21 cubin, and compute_20 PTX
- # - with CUDA >=4.2 compute capabity <=3.0 is supported:
+ # - with CUDA >=4.2 compute capability <=3.0 is supported:
# => compile sm_20, sm_21, sm_30 cubin, and compute_30 PTX
- # - with CUDA 5.0 compute capabity 3.5 is supported, but generating code
- # optimized for sm_35 results in lower performance than with sm_30.
+ # - with CUDA 5.0 and later compute capability 3.5 is supported
+ # => compile sm_20, sm_21, sm_30, sm_35 cubin, and compute_35 PTX
if(CUDA_VERSION VERSION_LESS "4.2")
set(_CUDA_ARCH_STR "-gencode;arch=compute_20,code=sm_20;-gencode;arch=compute_20,code=sm_21;-gencode;arch=compute_20,code=compute_20")
- else()
+ elseif(CUDA_VERSION VERSION_LESS "5.0")
set(_CUDA_ARCH_STR "-gencode;arch=compute_20,code=sm_20;-gencode;arch=compute_20,code=sm_21;-gencode;arch=compute_30,code=sm_30;-gencode;arch=compute_30,code=compute_30")
+ else()
+ set(_CUDA_ARCH_STR "-gencode;arch=compute_20,code=sm_20;-gencode;arch=compute_20,code=sm_21;-gencode;arch=compute_30,code=sm_30;-gencode;arch=compute_35,code=sm_35;-gencode;arch=compute_35,code=compute_35")
endif()
# finally set the damn flags
set(CUDA_NVCC_FLAGS
- "${_CUDA_ARCH_STR};-use_fast_math;${CUDA_NVCC_HOST_COMPILER_OPTIONS};${_FPIC_NVCC_FLAG}"
+ "${_CUDA_ARCH_STR};-use_fast_math;${_HOST_COMPILER_OPTION_STRING}${CUDA_HOST_COMPILER_OPTIONS}"
CACHE STRING "Compiler flags for nvcc." FORCE)
endif()