What is the purpose of the “Prefer 32-bit” setting in Visual Studio and how does it actually work?

Microsoft has a blog entry What AnyCPU Really Means As Of .NET 4.5 and Visual Studio 11: In .NET 4.5 and Visual Studio 11 the cheese has been moved. The default for most .NET projects is again AnyCPU, but there is more than one meaning to AnyCPU now. There is an additional sub-type of AnyCPU, … Read more

Why compile Python code?

It’s compiled to bytecode which can be used much, much, much faster. The reason some files aren’t compiled is that the main script, which you invoke with python main.py is recompiled every time you run the script. All imported scripts will be compiled and stored on the disk. Important addition by Ben Blank: It’s worth … Read more

Displaying the build date

Jeff Atwood had a few things to say about this issue in Determining Build Date the hard way. The most reliable method turns out to be retrieving the linker timestamp from the PE header embedded in the executable file — some C# code (by Joe Spivey) for that from the comments to Jeff’s article: public … Read more

Why do you have to link the math library in C?

The functions in stdlib.h and stdio.h have implementations in libc.so (or libc.a for static linking), which is linked into your executable by default (as if -lc were specified). GCC can be instructed to avoid this automatic link with the -nostdlib or -nodefaultlibs options. The math functions in math.h have implementations in libm.so (or libm.a for … Read more

How to prevent Less from trying to compile CSS calc() properties?

Less no longer evaluates expression inside calc by default since v3.00. Original answer (Less v1.x…2.x): Do this: body { width: calc(~”100% – 250px – 1.5em”); } In Less 1.4.0 we will have a strictMaths option which requires all Less calculations to be within brackets, so the calc will work “out-of-the-box”. This is an option since … Read more

What are .a and .so files?

Archive libraries (.a) are statically linked i.e when you compile your program with -c option in gcc. So, if there’s any change in library, you need to compile and build your code again. The advantage of .so (shared object) over .a library is that they are linked during the runtime i.e. after creation of your … Read more

Why does C++ compilation take so long?

Several reasons Header files Every single compilation unit requires hundreds or even thousands of headers to be (1) loaded and (2) compiled. Every one of them typically has to be recompiled for every compilation unit, because the preprocessor ensures that the result of compiling a header might vary between every compilation unit. (A macro may … Read more

What does a just-in-time (JIT) compiler do?

A JIT compiler runs after the program has started and compiles the code (usually bytecode or some kind of VM instructions) on the fly (or just-in-time, as it’s called) into a form that’s usually faster, typically the host CPU’s native instruction set. A JIT has access to dynamic runtime information whereas a standard compiler doesn’t … Read more

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