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    <p>You should build Qt with the MinGW compiler you're using to build your application. GCC is generally less sensitive to binary compatibility issues than MSVC is, but Qt is a big, complex framework library. If anything would expose those kinds of issues, Qt would probably be on the short list.</p> <p>Building Qt is pretty straightforward, but it takes a lot of time and there always seems to be two or three patches I need to make to get things to build successfully.</p> <p>The last time I built Qt (4.7.3) with MinGW, I had to make the following patches - I'm not sure whether they will still apply to Qt 4.8:</p> <ul> <li>make sure not to enable C++11 mode in the compiler - there are several macros with concatenated string literals that break under the new C++11 extended literal syntax</li> <li><p>there is a problem with how some distributions of MinGW incorporate the Microsoft extensions to <code>float.h</code> - I had to sometimes had to add the line:</p> <pre><code>#include_next &lt;float.h&gt; </code></pre> <p>to the end of the MinGW-specific <code>float.h</code> so the generic GCC <code>float.h</code> would get processed properly. I had to do this for nuwen 4.7.0 <code>lib/gcc/i686-pc-mingw32/4.7.0/include/float.h</code> and TDM 4.6.1 32-bit distro <code>lib/gcc/mingw32/4.6.1/include/float.h</code> (the 64-bit distro of TDM didn't need this patch).</p></li> <li><p>patch <code>qmake\Makefile.win32-g++</code> and <code>qmake\Makefile.win32-g++-sh</code> to remove the <code>-static-libstdc++</code> option that GCC doesn't recognize (and now errors out on instead of ignores)</p></li> <li><p>patch <code>mkspecs/win32-g++/qmake.conf</code> to move the <code>-Wl,</code> in the <code>QMAKE_LFLAGS_EXCEPTIONS_ON</code> macro to its proper place in <code>QMAKE_FLAGS</code>:</p> <pre><code>QMAKE_LFLAGS = -Wl,-enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc QMAKE_LFLAGS_EXCEPTIONS_ON = -mthreads </code></pre></li> <li><p>copy <code>make.exe</code> to <code>mingw32-make.exe</code> in MinGW's <code>bin</code> directory if there's not already a <code>mingw32-make.exe</code></p></li> </ul> <p>Then building Qt consists of:</p> <pre><code> set QTDIR=&lt;location of Qt source directory&gt; # where configure.exe is set PATH=%QTDIR%\bin;c:\MinGW\bin;%PATH% set INCLUDE= set LIB= cd %QTDIR% mingw32-make confclean # (this should fail the first time, since there's nothing to clean) configure.exe -opensource -debug-and-release -nomake examples -nomake demos -nomake tests -platform win32-g++ # and accept the GPL license mingw32-make </code></pre> <p>This takes a while... hopefully nothing else will need patching.</p>
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    1. POQt 4.8.2 With GCC 4.7.0.1 Keeps Crashing
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    1. USMichael Burr
    1. USMichael Burr
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    1. POQt 4.8.2 With GCC 4.7.0.1 Keeps Crashing
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    1. COthis makes sense. will try later sometime.
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    2. CO'A while' means up to 10 hours, am I wrong?
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      1. UScubuspl42
    3. CO@cubuspl42: that's in line with my experience. Maybe people who do it a lot know of tricks to speed it up or parallelize it? I build both debug and release; doing only release might save some time if you don't need to debug into the Qt libs.
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