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POBuild shared library with Clang++
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  1. POBuild shared library with Clang++
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    copied!<p>I am trying to build a shared library (dll for Windows) using Clang++.</p> <p>I have run the following commands:</p> <pre><code>clang++ -c -o hello.o hello.cpp clang++ -shared -v -o hello.dll hello.o </code></pre> <p>The first command works fine but when I try to build the dll I get this error:</p> <pre><code>clang version 3.2 (tags/RELEASE_32/final) Target: i686-pc-mingw32 Thread model: posix "c:/MinGW/bin/g++.exe" -shared -v -m32 -o worker.dll worker.o Using built-in specs. COLLECT_GCC=c:/MinGW/bin/g++.exe COLLECT_LTO_WRAPPER=c:/mingw/bin/../libexec/gcc/mingw32/4.6.2/lto-wrapper.exe Target: mingw32 Configured with: ../gcc-4.6.2/configure --enable-languages=c,c++,ada,fortran,objc,obj-c++ --disable-sjlj-exceptions --with-dwarf2 --enable-shared --enable-libgomp --disable-win32-registry --enable-libstdcxx-debug --enable-version-specific-runtime-libs --build=mingw32 --prefix=/mingw Thread model: win32 gcc version 4.6.2 (GCC) COMPILER_PATH=c:/mingw/bin/../libexec/gcc/mingw32/4.6.2/;c:/mingw/bin/../libexec/gcc/;c:/mingw/bin/../lib/gcc/mingw32/4.6.2/../../../../mingw32/bin/ LIBRARY_PATH=c:/mingw/bin/../lib/gcc/mingw32/4.6.2/;c:/mingw/bin/../lib/gcc/;c:/mingw/bin/../lib/gcc/mingw32/4.6.2/../../../../mingw32/lib/;c:/mingw/bin/../lib/gcc/mingw32/4.6.2/../../../;/mingw/lib/ COLLECT_GCC_OPTIONS='-shared' '-v' '-m32' '-o' 'worker.dll' '-shared-libgcc' '-mtune=i386' '-march=i386' c:/mingw/bin/../libexec/gcc/mingw32/4.6.2/collect2.exe --shared -Bdynamic -e _DllMainCRTStartup@12 --enable-auto-image-base -u ___register_frame_info -u ___deregister_frame_info -o worker.dll c:/mingw/bin/../lib/gcc/mingw32/4.6.2/../../../dllcrt2.o c:/mingw/bin/../lib/gcc/mingw32/4.6.2/crtbegin.o -Lc:/mingw/bin/../lib/gcc/mingw32/4.6.2 -Lc:/mingw/bin/../lib/gcc -Lc:/mingw/bin/../lib/gcc/mingw32/4.6.2/../../../../mingw32/lib -Lc:/mingw/bin/../lib/gcc/mingw32/4.6.2/../../.. -L/mingw/lib worker.o -lstdc++ -lmingw32 -lgcc_s -lgcc -lmoldname -lmingwex -lmsvcrt -ladvapi32 -lshell32 -luser32 -lkernel32 -lmingw32 -lgcc_s -lgcc -lmoldname -lmingwex -lmsvcrt c:/mingw/bin/../lib/gcc/mingw32/4.6.2/crtend.o Cannot export _hello: symbol not found collect2: ld returned 1 exit status clang++: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation) </code></pre> <p>Here is the file I am compiling:</p> <pre><code>// hello.cpp #include &lt;iostream&gt; #if defined(_WIN32) #define LIBRARY_API __declspec(dllexport) #else #define LIBRARY_API #endif extern "C" void LIBRARY_API hello(); void hello() { std::cout &lt;&lt; "Hello, World!" &lt;&lt; std::endl; } </code></pre>
 

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