Re: [Mingw-users] fopen in msys/mingw

[Lorenzo B. <be...@ds...>]

Tor Lillqvist wrote:
>> You mean that gcc does like that for determining its own path?
> 
> It could, but it doesn't. As far as I could see gcc instead seems to
> rely on argv[0] containing a full path to the gcc executable, or if
> that is not the case, the executable being present in PATH. This of
> course usually works fine, too.
> 
> But note that you said "also for libraries". (Presumably meaning
> *shared* libraries.) For a shared library to find out where it is
> located there is no argv[0] to use. You must use ifdefs as the name of
> a shared library file is different on different platforms, and the
> environment variable that tells where to search for shared libraries
> is different (PATH, LD_LIBRARY_PATH, SHLIB_PATH, DYLD_PATH, others?).
> 
> Also, actually you of course can't be sure that the library was found
> using such an environment variable directed mechanism. It might have
> been found in a system-dependent standard location (%WINDIR%/system32,
> %WINDIR%, the current directory, the folder where the .exe is,
> /usr/lib, /usr/lib64, etc) or have been loaded using an explicit path
> either programmatically or by the executable file format specifying an
> explicit path or additional search path. And as you need ifdefs
> anyway, why not just then in the case of Windows use the simple
> DllMain() (to save the DLL handle) and GetModuleFileName() method.

OK, then we're back to hardcode the path where the library (since from 
what I read above, there's no easy and reliable way to detect the right 
path) will be installed, and back to my problem that the path /usr/local 
will not work for fopen...

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Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
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