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Re: [Mingw-users] library issues with MinGW
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From: Patrick G. <pa...@pa...> - 2009-10-14 19:18:46
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Brecht Sanders wrote:
<blockquote cite="mid:4AD...@sa..." type="cite">
<pre wrap="">Patrick Galbraith wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi all,
I am in the process of trying to get memcached compiled under MinGW
which I have been successful with. The problem I'm encountering is
running the binary produced, memcached.exe, outside of MinGW, such as
using command.com. When I run the program under command.com, I get this
error:
<a class="moz-txt-link-freetext" href="http://img.skitch.com/20091014-c29tkfk4rihca638p5wsa1ppf1.jpg">http://img.skitch.com/20091014-c29tkfk4rihca638p5wsa1ppf1.jpg</a>
</pre>
</blockquote>
<pre wrap=""><!---->It simply means it didn't find the DLL in your PATH from command.com.
If you copy the missing DLL in your PATH or in the same directory as the
EXE file it should work.
</pre>
</blockquote>
Brecht,<br>
<br>
Thank you for the reply. What I meant was that I built memcached.exe
against a static pthread library, libpthreadGCE2.a, a static library.
If I run memcached.exe (in the same directory it was built in) from
MinGW, it runs fine. If I run it in the same directory it was build in
from command.com, a dialog window pops up stating it can't find
pthreadGCE2.dll, which would happen to be a dynamic library. Also,
using 'nm', I can clearly see that the symbols for pthreads is in the
memcached.exe binary. So, I'm not quite sure what to do to get this exe
file to run and why despite having the symbols it needs, it needs a
dynamic library.<br>
<br>
Again,<br>
<br>
Thank you!<br>
<br>
--Patrick<br>
<blockquote cite="mid:4AD...@sa..." type="cite">
<blockquote type="cite">
<pre wrap="">Though, if I check the symbols in the executable, you can see it does
have the pthread symbols, since I linked against both a static pthread
and libevent library:
<a class="moz-txt-link-freetext" href="http://img.skitch.com/20091014-cxbqxfh1b3htsprqrfj9w8m741.jpg">http://img.skitch.com/20091014-cxbqxfh1b3htsprqrfj9w8m741.jpg</a>
So, the questions I have are:
1. Can you build a program using gcc/MinGW and have it run standalone
outside of MinGW - no library dependencies or need to have MinGW installed?
</pre>
</blockquote>
<pre wrap=""><!---->If the EXE is has no dependancies this will work right away.
If it depends on DLLs you must make sure they can be loaded when the EXE
is run.
If you google around you should be able to in which order different
locations are searched when a DLL is required.
Usually it will be in a folder that is in your PATH environment
variable, or in the same directory as the EXE file (I believe the
Windows directory and/or the System32 beneath it are also checked).
Personally to have something run standalone I just put the DLLs in the
same folder as the EXE.
To know which DLLs are needed I use depends22_x86 (get it from
<a class="moz-txt-link-freetext" href="http://www.dependencywalker.com/depends22_x86.zip">http://www.dependencywalker.com/depends22_x86.zip</a>).
To actually copy the DLLs there I go the the folder containing the EXE
in an MSYS shell and run the following 4 commands:
'C:\Program Files\Tools\depends22_x86'/depends -c
-oc:dll_dependancies.out -f:1 NAME_OF_EXE_OR_DLL_FILE
awk -F, '{ print $2 }' dll_dependancies.out | grep -vi `echo
$WINDIR\\\|sed 's?\\\?&&?g'`
awk -F, '{ print "cp " $2 " ." }' dll_dependancies.out | grep -vi `echo
$WINDIR\\\|sed 's?\\\?&&?g'` | grep -v '^cp Module ' | sed -e "s?\"?'?g;
s?\\\\?/?g" | sh
rm dll_dependancies.out
</pre>
<blockquote type="cite">
<pre wrap="">2. Can you build dll's from MinGW?
</pre>
</blockquote>
<pre wrap=""><!---->Yes you can. In fact many cross platform libraries can be built with
MinGW/MSYS using ./configure && make just like on *nix like platforms.
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</pre>
</blockquote>
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