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nvcc_wrapper
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Sat, Jan 11, 15:42

nvcc_wrapper
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#!/bin/bash
#
# This shell script (nvcc_wrapper) wraps both the host compiler and
# NVCC, if you are building legacy C or C++ code with CUDA enabled.
# The script remedies some differences between the interface of NVCC
# and that of the host compiler, in particular for linking.
# It also means that a legacy code doesn't need separate .cu files;
# it can just use .cpp files.
#
# Default settings: change those according to your machine. For
# example, you may have have two different wrappers with either icpc
# or g++ as their back-end compiler. The defaults can be overwritten
# by using the usual arguments (e.g., -arch=sm_30 -ccbin icpc).
default_arch="sm_35"
#default_arch="sm_50"
#
# The default C++ compiler.
#
host_compiler=${NVCC_WRAPPER_DEFAULT_COMPILER:-"g++"}
#host_compiler="icpc"
#host_compiler="/usr/local/gcc/4.8.3/bin/g++"
#host_compiler="/usr/local/gcc/4.9.1/bin/g++"
#
# Internal variables
#
# C++ files
cpp_files=""
# Host compiler arguments
xcompiler_args=""
# Cuda (NVCC) only arguments
cuda_args=""
# Arguments for both NVCC and Host compiler
shared_args=""
# Linker arguments
xlinker_args=""
# Object files passable to NVCC
object_files=""
# Link objects for the host linker only
object_files_xlinker=""
# Shared libraries with version numbers are not handled correctly by NVCC
shared_versioned_libraries_host=""
shared_versioned_libraries=""
# Does the User set the architecture
arch_set=0
# Does the user overwrite the host compiler
ccbin_set=0
#Error code of compilation
error_code=0
# Do a dry run without actually compiling
dry_run=0
# Skip NVCC compilation and use host compiler directly
host_only=0
# Enable workaround for CUDA 6.5 for pragma ident
replace_pragma_ident=0
# Mark first host compiler argument
first_xcompiler_arg=1
temp_dir=${TMPDIR:-/tmp}
# Check if we have an optimization argument already
optimization_applied=0
#echo "Arguments: $# $@"
while [ $# -gt 0 ]
do
case $1 in
#show the executed command
--show|--nvcc-wrapper-show)
dry_run=1
;;
#run host compilation only
--host-only)
host_only=1
;;
#replace '#pragma ident' with '#ident' this is needed to compile OpenMPI due to a configure script bug and a non standardized behaviour of pragma with macros
--replace-pragma-ident)
replace_pragma_ident=1
;;
#handle source files to be compiled as cuda files
*.cpp|*.cxx|*.cc|*.C|*.c++|*.cu)
cpp_files="$cpp_files $1"
;;
# Ensure we only have one optimization flag because NVCC doesn't allow muliple
-O*)
if [ $optimization_applied -eq 1 ]; then
echo "nvcc_wrapper - *warning* you have set multiple optimization flags (-O*), only the first is used because nvcc can only accept a single optimization setting."
else
shared_args="$shared_args $1"
optimization_applied=1
fi
;;
#Handle shared args (valid for both nvcc and the host compiler)
-D*|-c|-I*|-L*|-l*|-g|--help|--version|-E|-M|-shared)
shared_args="$shared_args $1"
;;
#Handle shared args that have an argument
-o|-MT)
shared_args="$shared_args $1 $2"
shift
;;
#Handle known nvcc args
-gencode*|--dryrun|--verbose|--keep|--keep-dir*|-G|--relocatable-device-code*|-lineinfo|-expt-extended-lambda|--resource-usage|-Xptxas*)
cuda_args="$cuda_args $1"
;;
#Handle more known nvcc args
--expt-extended-lambda|--expt-relaxed-constexpr)
cuda_args="$cuda_args $1"
;;
#Handle known nvcc args that have an argument
-rdc|-maxrregcount|--default-stream)
cuda_args="$cuda_args $1 $2"
shift
;;
#Handle c++11 setting
--std=c++11|-std=c++11)
shared_args="$shared_args $1"
;;
#strip of -std=c++98 due to nvcc warnings and Tribits will place both -std=c++11 and -std=c++98
-std=c++98|--std=c++98)
;;
#strip of pedantic because it produces endless warnings about #LINE added by the preprocessor
-pedantic|-Wpedantic|-ansi)
;;
#strip of -Woverloaded-virtual to avoid "cc1: warning: command line option ‘-Woverloaded-virtual’ is valid for C++/ObjC++ but not for C"
-Woverloaded-virtual)
;;
#strip -Xcompiler because we add it
-Xcompiler)
if [ $first_xcompiler_arg -eq 1 ]; then
xcompiler_args="$2"
first_xcompiler_arg=0
else
xcompiler_args="$xcompiler_args,$2"
fi
shift
;;
#strip of "-x cu" because we add that
-x)
if [[ $2 != "cu" ]]; then
if [ $first_xcompiler_arg -eq 1 ]; then
xcompiler_args="-x,$2"
first_xcompiler_arg=0
else
xcompiler_args="$xcompiler_args,-x,$2"
fi
fi
shift
;;
#Handle -ccbin (if its not set we can set it to a default value)
-ccbin)
cuda_args="$cuda_args $1 $2"
ccbin_set=1
host_compiler=$2
shift
;;
#Handle -arch argument (if its not set use a default
-arch*)
cuda_args="$cuda_args $1"
arch_set=1
;;
#Handle -Xcudafe argument
-Xcudafe)
cuda_args="$cuda_args -Xcudafe $2"
shift
;;
#Handle args that should be sent to the linker
-Wl*)
xlinker_args="$xlinker_args -Xlinker ${1:4:${#1}}"
host_linker_args="$host_linker_args ${1:4:${#1}}"
;;
#Handle object files: -x cu applies to all input files, so give them to linker, except if only linking
*.a|*.so|*.o|*.obj)
object_files="$object_files $1"
object_files_xlinker="$object_files_xlinker -Xlinker $1"
;;
#Handle object files which always need to use "-Xlinker": -x cu applies to all input files, so give them to linker, except if only linking
@*|*.dylib)
object_files="$object_files -Xlinker $1"
object_files_xlinker="$object_files_xlinker -Xlinker $1"
;;
#Handle shared libraries with *.so.* names which nvcc can't do.
*.so.*)
shared_versioned_libraries_host="$shared_versioned_libraries_host $1"
shared_versioned_libraries="$shared_versioned_libraries -Xlinker $1"
;;
#All other args are sent to the host compiler
*)
if [ $first_xcompiler_arg -eq 1 ]; then
xcompiler_args=$1
first_xcompiler_arg=0
else
xcompiler_args="$xcompiler_args,$1"
fi
;;
esac
shift
done
#Add default host compiler if necessary
if [ $ccbin_set -ne 1 ]; then
cuda_args="$cuda_args -ccbin $host_compiler"
fi
#Add architecture command
if [ $arch_set -ne 1 ]; then
cuda_args="$cuda_args -arch=$default_arch"
fi
#Compose compilation command
nvcc_command="nvcc $cuda_args $shared_args $xlinker_args $shared_versioned_libraries"
if [ $first_xcompiler_arg -eq 0 ]; then
nvcc_command="$nvcc_command -Xcompiler $xcompiler_args"
fi
#Compose host only command
host_command="$host_compiler $shared_args $xcompiler_args $host_linker_args $shared_versioned_libraries_host"
#nvcc does not accept '#pragma ident SOME_MACRO_STRING' but it does accept '#ident SOME_MACRO_STRING'
if [ $replace_pragma_ident -eq 1 ]; then
cpp_files2=""
for file in $cpp_files
do
var=`grep pragma ${file} | grep ident | grep "#"`
if [ "${#var}" -gt 0 ]
then
sed 's/#[\ \t]*pragma[\ \t]*ident/#ident/g' $file > $temp_dir/nvcc_wrapper_tmp_$file
cpp_files2="$cpp_files2 $temp_dir/nvcc_wrapper_tmp_$file"
else
cpp_files2="$cpp_files2 $file"
fi
done
cpp_files=$cpp_files2
#echo $cpp_files
fi
if [ "$cpp_files" ]; then
nvcc_command="$nvcc_command $object_files_xlinker -x cu $cpp_files"
else
nvcc_command="$nvcc_command $object_files"
fi
if [ "$cpp_files" ]; then
host_command="$host_command $object_files $cpp_files"
else
host_command="$host_command $object_files"
fi
#Print command for dryrun
if [ $dry_run -eq 1 ]; then
if [ $host_only -eq 1 ]; then
echo $host_command
else
echo $nvcc_command
fi
exit 0
fi
#Run compilation command
if [ $host_only -eq 1 ]; then
$host_command
else
$nvcc_command
fi
error_code=$?
#Report error code
exit $error_code

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