Comments (4)
kevinboone
commented on September 28, 2024
2
What happens if you copy or link libstdc++.so.6 from it's installed
location to /usr/lib? Or set LD_LIBRARY_PATH to its installed location?
…On 11/09/18 07:34, K9spud wrote:
I am trying to compile a very simple C++ program on my Android 5.0
device using kbox4's gcc:
#include <iostream>
int main(int argc, char* argv[])
{
std::cout << "Hello world!" << std::endl;
return 0;
}
I can successfully compile and link it using:
$ g++ -c test.cpp
$ g++ test.o -o test
Unfortunately, when I attempt to run it, it gives me an error that I
do not know how to fix:
$ ./test
CANNOT LINK EXECUTABLE DEPENDENCIES: library "libstdc++.so.6" not found
I can see that kbox4 has libstdc++.so.6 inside /usr/gcc-4.9-pie/lib/,
but I can not figure out how to get it to work. Making a similar hello
world test program in C with stdio.h and printf works fine, just C++
seems to fail.
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k9spud
commented on September 28, 2024
I tried setting LD_LIBRARY_PATH to include /usr/gcc-4.9-pie/lib, but it seems to have no effect:
$ echo $LD_LIBRARY_PATH /data/data/com.k9spud.CppEditor/kbox4/lib:/data/data/com.k9spud.CppEditor/kbox4/usr/lib $ export LD_LIBRARY_PATH='/data/data/com.k9spud.CppEditor/kbox4/usr/gcc-4.9-pie/lib:/data/data/com.k9spud.CppEditor/kbox4/lib:/data/data/com.k9spud.CppEditor/kbox4/usr/lib' $ ./test CANNOT LINK EXECUTABLE DEPENDENCIES: library "libstdc++.so.6" not found
Then I tried symlinking the libraries as you suggested:
$ cd /usr/lib $ ln -s ../gcc-4.9-pie/lib/libstdc++.so.6.0.20 libstdc++.so.6 $ ln -s ../gcc-4.9-pie/lib/libgcc_s.so.1 libgcc_s.so.1 $ ~/test Hello world! $
Lo and behold, it works! Thank you so much!
How come setting LD_LIBRARY_PATH doesn't seem to do anything? I can even clear it out completely (removing all the paths) and everything still runs just the same. How does it know to look in /usr/lib when I'm running under the kbox_shell? Is /usr/lib something hard coded into the libfakechroot.so thingy?
from source.
kevinboone
commented on September 28, 2024
If you're using the KBOX shell, then LD_LIBRARY_PATH should be set to
the "virtual" path; that is, you should set it to something like
/usr/gcc-4.9-pie/lib. There should never, in principle, be a good reason
to set LD_LIBRARY_PATH to a location in the underlying Android
filesystem. However, "in principle" is a weasel term, and I can
understand that the imperfect implementation of libfakechroot, coupled
with the willingness of developers to write code (presumably
unwittingly) that defeats it, might sometimes mean that /data/data/...
paths will have to crop up from time to time.
In any case, code produced using gcc/g++ should respect LD_LIBRARY_PATH
(as a KBOX directory, not an Android directory) and, if it doesn't,
that's a bug that ought to be looked at separately.
The specific bug here is that I didn't package up the standard C++
libraries into the conventional directories, and that's my fault.
…On 11/09/18 19:32, K9spud wrote:
I tried setting LD_LIBRARY_PATH to include /usr/gcc-4.9-pie/lib, but
it seems to have no effect:
$ echo $LD_LIBRARY_PATH
/data/data/com.k9spud.CppEditor/kbox4/lib:/data/data/com.k9spud.CppEditor/kbox4/usr/lib
$ export LD_LIBRARY_PATH='/data/data/com.k9spud.CppEditor/kbox4/usr/gcc-4.9-pie/lib:/data/data/com.k9spud.CppEditor/kbox4/lib:/data/data/com.k9spud.CppEditor/kbox4/usr/lib'
$ ./test
CANNOT LINK EXECUTABLE DEPENDENCIES: library "libstdc++.so.6" not found
Then I tried symlinking the libraries as you suggested:
$ cd /usr/lib
$ ln -s ../gcc-4.9-pie/lib/libstdc++.so.6.0.20 libstdc++.so.6
$ ln -s ../gcc-4.9-pie/lib/libgcc_s.so.1 libgcc_s.so.1
$ ~/test
Hello world!
$
Lo and behold, it works! Thank you so much!
How come setting LD_LIBRARY_PATH doesn't seem to do anything? I can
even clear it out completely (removing all the paths) and everything
still runs just the same. How does it know to look in /usr/lib when
I'm running under the kbox_shell? Is /usr/lib something hard coded
into the libfakechroot.so thingy?
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k9spud
commented on September 28, 2024
FYI, I did a little more testing, this time trying to set LD_LIBRARY_PATH to point at the kbox "virtual" path of "/usr/gcc-4.9-pie/lib" instead of the underlying Android filesystem path. Still no go -- LD_LIBRARY_PATH seems to be completely ignored as far as I can tell.
Anyway, since the symlinking in /usr/lib to /usr/gcc-4.9-pie/lib/* works, I'm quite satisfied for the moment.
Thank you so much for making kbox! I managed to easily compile SLiRP on my Android and can now use PPP over ADB to achieve USB tethering for free. Yay!
Next I've been attempting to compile Qt's command line build tools (qmake, uic, moc, etc) for my Android and gotten pretty far, but not quite sure how to get resultant Android self-hosted compiled Qt apps to execute. Qt apps on Android seem to compile C++ code down to a .SO library instead of a direct executable and then some Java loader that the Qt people wrote does the actual loading and execution of the Qt C++ application code inside the .SO. Hence my interest in understanding how the system figures out how and where to load .SO files...
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