rugdealer rugdealer - 7 days ago 6
Swift Question

/usr/bin/ld: cannot find -lstdc++ for Ubuntu while trying to "swift build" Perfect2 project

Description:



I've followed the installation steps for Swift3 and Perfect2
and I've cloned the PerfectTemplate test project proposed by Perfect and I've tried
swift build


Error Message:




warning: minimum recommended clang is version 3.6, otherwise you may
encounter linker errors. Linking ./.build/debug/PerfectTemplate
/usr/bin/ld: cannot find -lstdc++ clang: error: linker command failed
with exit code 1 (use -v to see invocation) :0: error: link
command failed with exit code 1 (use -v to see invocation)
:0: error: build had 1 command failures error: exit(1):
/etc/swift301/usr/bin/swift-build-tool -f
/home/XXXX/ClionProjects/PerfectTemplate/.build/debug.yaml


What I've tried:



I've gone on different SO questions that seemed similar but all on different projects and attempted to try their solutions without luck:

For example:

/usr/bin/ld: cannot find -lstdc++

I also noticed the warning coming from the clang version, I am aware that my current version is 3.4, but that is what was installed via
sudo apt-get install clang
as mentioned in the documentation.

I've also tried installing the 3.6 version of clang with:
sudo apt-get install clang-3.n


However, after when I try
swift build
again I get the following error:


error: invalid inferred toolchain: could not find
clang



Question:



How do I get rid of the
/usr/bin/ld: cannot find -lstdc++
error, so I can build the PerfectTemplate project?

Answer

Try this. It might not work, but it's worth a shot.

Update packages and dependencies:

sudo apt-get update

Then install clang 3.6:

sudo apt-get install clang-3.6
sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-3.6 100
sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-3.6 100

I hope this helps, but apologies if it doesn't. Best of luck!


If this error appears:

/usr/bin/ld.gold: error: cannot open /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9/../../../libstdc++.‌​so: No such file or directory

It's most likely that the libstdc++.so symbolic link points to an inexisting file.

In my case it was pointing to:

/usr/lib/libstdc++.so -> /usr/lib/libstdc++.so.6

Which was incorrect because libstdc++.so.6 did not exist in that area. Simply find it's location via: sudo find / -name libstdc++.so.6 which gave me:

/usr/lib/x86_64-linux-gnu/libstdc++.so.6

Then recreate the link with:

sudo rm /usr/lib/libstdc++.so
sudo ln -s /usr/lib/x86_64-linux-gnu/libstdc++.so.6 /usr/lib/libstdc++.so