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Asked: 2026-05-14T01:29:12+00:00

I need some help on compiler flags in c++. I’m using a library that

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I need some help on compiler flags in c++. I’m using a library that is a port to linux from windows, that has to be compiled with the -malign-double flag, “for Win32 compatibility”. It’s my understanding that this mean I absolutely have to compile my own code with this flag as well? How about other .so shared libraries, do they have be recompiled with this flag as well? If so, is there any way around this?

I’m a linux newbie (and c++), so even though I tried to recompile all the libraries I’m using for my project, it was just too complicated to recursively find the source for all the libraries and the libraries they’re dependent on, and recompile everything.

Edit:
Thanks for the answers. Some background: This library controls the initialization and access to a USB-connected camera. The problem is that without this flag, weird things start to happen. Seemingly at random, the initialization of the camera fails, with USB connection errors. I also get some kind of memory corruption of several c-strings (const char*) that are on the stack. Basically, before I call the initialization of this camera, they point to a directory path; after the initialization, they point to the string “me”. Which to me is very confusing.

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1 Answer

  1. Editorial Team

    You usually dont need to change alignment settings for modern compilers.
    Even if compiler will store someting unaligned, program will be not broken.

    The only place where it can be needed is stuctures passed between linux and windows version of programm in binary (via files or via network). But in these cases the usage of pragma pack is better style.

    Update: drivers also require binary structures to be bit-by-bit equal with specification.

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