[Mingw-users] Undefined references to standard library functions, cross compiling

[Dhrakol <dh...@ya...>]

Hello all,

After much combing through the archives, I am unable to find a solution
to a problem I am having cross compiling a Qt app on Linux. The target
is Windows. This question isn't necessarily Qt- related, but it might
help to keep that in mind. Several threads on this list addressed
similar problems, but the suggestions did not seem to help in this
instance. Perhaps there's a minor something that I'm missing?

I get several linker errors of the form "undefined reference to
`std::basic_stringstream" while building a particular source file. The
relevant <iosfwd> header that declares this is present, and a grep
through libstdc++.a appears to reveal a corresponding definition. The
linker is apparently not able to find a definition, though. Could
anyone suggest a reason for this? The options I am using are:

[compiler switches - something here is probably wrong]
-pipe -march=i586 -mcpu=i686 -fno-exceptions -mms-bitfields
-D_REENTRANT -DQT_THREAD_SUPPORT ;

[path to standard headers]
This is set to the /include directories for the mingw crosscompiler via
-L switches. 

[path to standard libraries]
This is set to the /lib directories for the mingw crosscompiler. Adding
a -lstdc++ switch does not seem to help.

Some threads mentioned libstdc++.la files in MINGW_DIRECTORY/.../lib as
the culprits behind similar "undefined reference" errors. As suggested,
I tried deleting/renaming these, as well as replacing them with ones
from the official mingw binaries on www.mingw.org. I also replaced the
compiled standard library that came with the prebuilt crosscompiler
binary I downloaded, with a precompiled standard library from
www.mingw.org. No luck in any of these cases.

If anyone can see where I'm going wrong, your help would be greatly
appreciated.

Thanks!

-Dhrakol


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