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copied!<p>If at first you don't succeed...</p> <p>I can now build LLVM 2.6 using MinGW GCC 4.4.0, and it isn't too hard once you know how. I still cannot run the DejaGNU tests, though at first sight that shouldn't be that hard - most likely I'll need the CygWin packages for dejagnu and expect. I also haven't built llvm-gcc yet.</p> <p>Before the step-by-step, here are the three problems... <HR> Problem 1...</p> <p>Attempting to build llvm using the standard build instructions fails with the following compiler error in Signals.cpp (win32/Program.inc)</p> <pre><code>llvm[1]: Compiling Signals.cpp for Release build In file included from Signals.cpp:33: Win32/Signals.inc: In function 'LONG LLVMUnhandledExceptionFilter(_EXCEPTION_POINTERS*)': Win32/Signals.inc:234: error: exception handling disabled, use -fexceptions to enable </code></pre> <p>The workaround is to use "make -k -fexceptions" - answer found in the pure language documentation. <HR> Problem 2...</p> <p>Even with the first workaround, the following compiler error occurs...</p> <pre><code>ExternalFunctions.cpp: In function 'bool ffiInvoke(void (*)(), llvm::Function*, const std::vector<llvm::GenericValue, std::allocator<llvm::GenericValue> >&, const llvm::TargetData*, llvm::GenericValue&)': ExternalFunctions.cpp:207: error: 'alloca' was not declared in this scope </code></pre> <p>It seems that an option is being specified which disables the "alloca" built-in.</p> <p>The workaround is to edit the problem file</p> <pre><code>C:\llvm-2.6\lib\ExecutionEngine\Interpreter\ExternalFunctions.cpp </code></pre> <p>Just after the "#include <string>" line, insert...</p> <pre><code>#define alloca __builtin_alloca </code></pre> <p><HR> Problem 3...</p> <p>Even with the compilation errors fixed, the example programs won't run. The run-time errors are...</p> <pre><code>Assertion failed: errorcode == 0, file RWMutex.cpp, line 87 </code></pre> <p>This relates to the use of the pthreads library, in the following lines of RWMutex.cpp</p> <pre><code>86: // Initialize the rwlock 87: errorcode = pthread_rwlock_init(rwlock, &attr); 88: assert(errorcode == 0); </code></pre> <p>The basic issue is that pthreads support is included in MinGW GCC, and included in the builds of AFAICT all the GCC4 variants - including the unofficial TDM builds, as well as including MinGW GCC 4.4.0. This was <em>not</em> included with MinGW GCC 3.4.5, which is why LLVM builds fine with default options on that compiler. Using 4.4.0, the LLVM configure script detects the pthreads support and uses it - but the pthreads-w32 library used seems not to be fully compatible.</p> <p>One workaround is to delete the following files from mingw gcc 4.4.0 as suggested in <a href="http://markmail.org/message/d7zw2zjq7svevsci" rel="noreferrer">http://markmail.org/message/d7zw2zjq7svevsci</a> - yes, I know I previously said they weren't there, but I had my folder layout confused...</p> <ul> <li>mingw32\include\pthread.h</li> <li>mingw32\include\sched.h</li> <li>mingw32\include\semaphore.h</li> <li>mingw32\lib\libpthread.a</li> </ul> <p>It is better, though, to simply tell the configure script to disable threads...</p> <pre><code>./configure --disable-threads </code></pre> <p><HR> So, the steps are...</p> <p>First, install the following MinGW and MSYS packages...</p> <p><UL> <LI>binutils-2.20-1-mingw32-bin.tar.gz <LI>mingwrt-3.17-mingw32-dev.tar.gz <LI>mingwrt-3.17-mingw32-dll.tar.gz <LI>w32api-3.14-mingw32-dev.tar.gz <LI>gcc-full-4.4.0-mingw32-bin-2.tar.lzma <LI>make-3.81-20090914-mingw32-bin.tar.gz <LI>tcltk-8.4.1-1.exe <LI>MSYS-1.0.11.exe <LI>msysDTK-1.0.1.exe <LI>bash-3.1.17-2-msys-1.0.11-bin.tar.lzma <LI>bison-2.4.1-1-msys-1.0.11-bin.tar.lzma <LI>flex-2.5.35-1-msys-1.0.11-bin.tar.lzma <LI>libregex-0.12-1-msys-1.0.11-dll-0.tar.lzma </UL></p> <p>This package list may be more than needed - in particular tcl tk is only needed for the DejaGNU tests, which I haven't got working yet.</p> <p>Make sure that the \bin folder of your MinGW install is on the PATH (Control Panel, System, Advanced, Environment Variables).</p> <p>Extract llvm-2.6.tar.gz</p> <p>Edit the file C:\llvm-2.6\lib\ExecutionEngine\Interpreter\ExternalFunctions.cpp, and just after the line "#include <string>", add the line</p> <pre><code>#define alloca __builtin_alloca </code></pre> <p>Start an MSYS command prompt, and run...</p> <pre><code>cd /c/llvm-2.6 ./configure --disable-threads make -k CXXFLAGS=-fexceptions </code></pre> <p>I'm assuming you extracted llvm to c:\llvm-2.6</p> <p>Handy hint - try "./configure --help"</p> <p>Consider the --enable-targets=host-only and --enable-doxygen configure script options in particular.</p>

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