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Message-ID: <20130724233611.5bac4fe7@sibserver.ru> Date: Wed, 24 Jul 2013 23:36:11 +0800 From: orc <orc@...server.ru> To: musl@...ts.openwall.com Subject: Re: Missing symbols for supporting glibc-built libstdc++.so.6 On Wed, 24 Jul 2013 10:47:27 -0400 Rich Felker <dalias@...ifal.cx> wrote: > On Wed, Jul 24, 2013 at 10:20:03PM +0800, orc wrote: > > About a year ago while experimenting with musl desktop, various > > binary blobs I unfortunately tied to (you should remember > > short discuss about nvidia blob compatibility) I tried to use my > > host libstdc++.so with musl linker and that failed because of gnu > > "unique symbol" extension. Did you encountered same problem here? > > If so, is it solved now? > > I have only tested with simple C++ .so files using the musl-built > libstdc++.so, and so far, they've worked fine. These tests are by no > means extensive, just "hello world". I have not tried using the > glibc-built libstdc++.so.6 again; the "missing symbols" check was > based purely on the output of: > > nm -u -D libstdc++.so.6 | grep -v -e _[UJ] -e ' w ' > > Do you know the subject line of the thread where your issue was > discussed before? I'd be happy to go look and see if I think the issue > is fixed now. I did not send a report about this especially, just my experiments showed that. Just because nvidia blob did not require libstdc++.so at all. But others did. You can start reading somewhere in long 'Hello' thread about 6 Jul 2012. Tested now: - Hello world prog: #include <iostream> int main() { std::cout << "Hello, world!" << std::endl; return 0; } % g++ test.cc -o test-cpp % musl-out/lib/libc.so ./test-cpp [lots of "Error relocating..." errors] % musl-out/lib/libc.so ./test-cpp 2>&1 | fgrep _ZGVNSt7collateIwE2idE # picking one % nm /usr/lib/libstdc++.so.6 | fgrep _ZGVNSt7collateIwE2idE 00000000002e40d8 u _ZGVNSt7collateIwE2idE (man nm says that 'u' is "unique global" and gnu extension) On musl system there is 'V' instead of 'u'. Is my example falls under "glibc-built libstdc++.so.6"? > > Rich
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