Gavin Baker gavinb

The Visual Studio compiler generates and modifies many large project-wide binary files during compilation, so normally you can only have one instance of cl running per project. If you use the awesome Ninja tool, it will happily run many instances in parallel on multicore systems. When run this way however, MSVC will throw errors like this:

fatal error C1041: cannot open program database 'sample_project_pathname.pdb';
if multiple CL.EXE write to the same .PDB file, please use /FS

Using Anaconda's distribution of Python for SciPy on Windows 10

Trying to install OpenCV support according to the official page:

https://anaconda.org/conda-forge/opencv

conda install -c conda-forge opencv

fails with the following error:

There is a package for the Insight Toolkit (ITK) v5.1 in the vcpkg tool's ports collection. It installs itself into a folder called ITK-5.1 under the triplet's include folder. However, if you are using the Visual Studio integration (which is very convenient) then this will not work. The headers in ITK do not have a prefix, so they expect to be in the root of a specified include path. The solution is to add it manually, thus:

go into the Project Properties' dialog
go to the 'C/C++ > General' page
edit the 'Additional Include Directories' setting
add the following entries to the paths:

We were seeing the following unexpected warnings in our builds:

C:/BuildAgent/work/19dd4d6ddfbe72aa/SecretProject/vcpkg_installed/x64-windows/include\fmt/format.h(771): warning : base class dllexport/dllimport specification differs from that of the derived class
C:/BuildAgent/work/19dd4d6ddfbe72aa/SecretProject/vcpkg_installed/x64-windows/include\fmt/format.h(3268): warning : base class dllexport/dllimport specification differs from that of the derived class

We use spdlog and fmt all over the place and weren't seeing these warnings elsewhere. Strangely there were not the usual error/warning codes that the compiler emits.
Then I noticed why - these diagnostics were preceded by the module name:

SomeFilter.cu

	/*
	swig -csharp -c++ -namespace MyControl -outdir ..\gen MyControl.i
	*/

	%module MyControl

	%include <attribute.i>

	%{
	/* Includes the header in the wrapper code */