<html>
    <head>
      <base href="https://llvm.org/bugs/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Windows mingw build broken"
   href="https://llvm.org/bugs/show_bug.cgi?id=25953">25953</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Windows mingw build broken
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>new-bugs
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>3.7
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>other
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>new bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>klamer.schutte@tno.nl
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Compilation of LLVM/CLANG fails, using mingw gcc 4.8.1 64 bit. Compiling with
Cmake, using MSYS Makefiles, and no further options.

Error message is like:
[ 82%] Building CXX object
tools/cfe-3.7.0.src/lib/Sema/CMakeFiles/clangSema.dir/SemaExpr.cpp.obj
c:/prog64/mingw64-4.8.1/bin/../lib/gcc/x86_64-w64-mingw32/4.8.1/../../../../x86_64-w64-mingw32/bin/as.exe:
CMakeFiles/clangSema.dir/SemaExpr.cpp.obj: too many sections (33299)
C:\Users\schuttek\AppData\Local\Temp\ccX5KUip.s: Assembler messages:
C:\Users\schuttek\AppData\Local\Temp\ccX5KUip.s: Fatal error: can't write
CMakeFiles/clangSema.dir/SemaExpr.cpp.obj: File too big
c:/prog64/mingw64-4.8.1/bin/../lib/gcc/x86_64-w64-mingw32/4.8.1/../../../../x86_64-w64-mingw32/bin/as.exe:
CMakeFiles/clangSema.dir/SemaExpr.cpp.obj: too many sections (33299)
C:\Users\schuttek\AppData\Local\Temp\ccX5KUip.s: Fatal error: can't close
CMakeFiles/clangSema.dir/SemaExpr.cpp.obj: File too big
make[2]: ***
[tools/cfe-3.7.0.src/lib/Sema/CMakeFiles/clangSema.dir/SemaExpr.cpp.obj] Error
1
make[1]: *** [tools/cfe-3.7.0.src/lib/Sema/CMakeFiles/clangSema.dir/all] Error
2
make: *** [all] Error 2

and also occurred on 
[ 82%] Building CXX object
tools/cfe-3.7.0.src/lib/ASTMatchers/Dynamic/CMakeFiles/clangDynamicASTMatchers.dir/Registry.cpp.obj

Solution seems to be to add -Wa,-mbig-obj to the compiler arguments as hinted
in
<a href="http://stackoverflow.com/questions/16596876/object-file-has-too-many-sections">http://stackoverflow.com/questions/16596876/object-file-has-too-many-sections</a>.
Note this needs an updated binutils install.</pre>
        </div>
      </p>
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