Is it possible to use a gcc compiled library with MSVC?
I have a project that relies on libiconv
for several operations.
I was using precompiled binaries for iconv.lib
for Visual Studio 2008 but now I had to move on to Visual Studio 2010 and no more precompiled binaries were available.
I decided to compile it myself but as the libiconv
documentation states, there开发者_运维知识库 is no official support for MSVC compilers. However, I read somewhere that gcc
could generate static libraries that were binary compatible with MSVC compilers, as long as the binary interface remains in C
. While that sounded crazy, I gave it a try and it actually almost worked.
I compiled it, renamed libiconv.a
to iconv.lib
and tried to link with it. (If this is a bad idea, please let me know).
First I encountered a link error:
1>iconv.lib(iconv.o) : error LNK2001: unresolved external symbol ___chkstk
After some research, I recompiled libiconv
(in both x86 and x64 version), adding the -static-libgcc
flag.
It worked, but only for the x64 release of my program. The x86 release always fails with the very same error.
What should I do to make this work ?
Yes, this is possible because if you compile strictly as a C interface, iconv will link to msvcrt.lib
, which is the Windows C runtime (strictly C, analogous to glibc
used by GCC). If you built it with GCC's normal C++ compiler, it would link to libstdc++
and also name mangle differently compared to VC++, which links to msvcr.dll
.
In your case, __chkstk
is the check stack function (part of C runtime), a function that is injected into each function call to check for stack overflows. I am not sure how to resolve this a 'good' way, but you can change your build options for iconv to build with an additional compiler flag and suppress this check: /Gs999999
However, I have built libiconv with Visual C++ 2005/2008/2010, and software I have built on top of it worked perfectly (software used by military institutions, if you need credibility). I do remember it being slightly annoying to build using the VC++ compiler though, but it should not be too much pain.
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