A tiny instruction of compiling ngspice with CUDA using Visual Studio 2015

visualc/how-to-cuspice-vstudio.txt

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+ngspice may be compiled by MS Visual Studio Community 2015.
+
+For compilation you need the GNU bison parser generator.
+
+A ready for windows compiled variant can be downloaded as
+  win_flex_bison-latest.zip
+from
+  http://sourceforge.net/projects/winflexbison/files/
+
+Create the directory
+  ../../flex-bison
+relative from this directory right here, and unzip there.
+
+We will invoke the win_bison.exe file
+ in this directory during the visual studio compilation.
+
+Install CUDA
+(tested with CUDA 8.0 from https://developer.nvidia.com/cuda-downloads)
+
+Only valid for Visual Studio 2015.
+VS 2017 is not supported by actaul CUDA 8.0 (as of Sept. 2017)!
+
+XSPICE and CIDER are not supported.
+fftw is not yet supported.
+OpenMP is not yet supported (It will compile, but ngspice.exe segfaults).
+
+Visual Studio is started by double click on cuspice.sln.
+Select 'Build' 'Configuration Manager' and then choose one
+of the build options, e.g. 'Active solution configuration'
+with its Debug or Release GUI versions or the
+equivalent console version (no GUI, no graphical interface),
+and 'Active solution platform', only available with 'x64',
+that is 64 bit code.
+
+Selection of 'Build' and then 'Rebuild solution' will build
+complete ngspice, starting with CUDA, where nvcc.exe is used
+to compile the CUDA files named *.cu, and afterwards all
+other files are compiled and ngspice.exe is generated. Finally
+make-install-vngspice.bat is called to copy ngspice.exe,
+spinit into a directory tree, that resembles the one
+generated by mingw 'make install'. Some warnings pop up
+that some files cannot be copied (these are in fact the code
+models not being available). An example tree is given
+below.
+
+C:\Spice64\
+    bin\
+        ngspice.exe
+        vcomp140.dll
+    share\
+        ngspice
+            scripts\
+                spinit
+
+If spinit is not found in the directory cited above,
+ngspice.exe also searches for spinit in its own directory.
+
+You may edit spinit to remove all line starting with 'codemodel'
+to avoid warnings after starting ngspice.