[MacPorts] ProblemHotlist modified

[MacPorts]

Changed page "ProblemHotlist" by ryandesign at macports.org from 70.253.78.18*
Page URL: <https://trac.macports.org/wiki/ProblemHotlist>
Diff URL: <https://trac.macports.org/wiki/ProblemHotlist?action=diff&version=70>
Revision 70
Comment: Add section about llvm/clang build failures and workarounds

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Index: ProblemHotlist
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--- ProblemHotlist (version: 69)
+++ ProblemHotlist (version: 70)
@@ -3,6 +3,43 @@
 == A port build fails on Snow Leopard with: "file is not of required architecture" == #wrongarch
 
 If you had MacPorts installed before upgrading to Snow Leopard, see [wiki:Migration].
+
+== A port fails to build when using Xcode 4 == #compiler
+
+gcc has been the compiler collection MacPorts has used by default up until Xcode 4, in which Apple has switched to the llvm/clang compiler collection. These are new compilers and many programs have not yet been tested with them, and some ports will fail as a result. Using a different compiler may work better for a particular port. If the below workarounds enable you to install a port that failed with its default compiler, file a ticket and let us know so we can fix it. Portfile authors, see wiki:PortfileRecipes#compiler.
+
+=== Xcode 4.2 and later === #xcode42
+
+If a port ''foo'' fails to build and you're using Xcode 4.2 or later, the default compiler is clang; try compiling with llvm-gcc-4.2 instead:
+
+{{{
+sudo port clean foo
+sudo port install foo configure.compiler=llvm-gcc-4.2
+}}}
+
+If that fails, try installing the apple-gcc42 port and compiling with that:
+
+{{{
+sudo port clean foo
+sudo port install apple-gcc42
+sudo port install foo configure.compiler=apple-gcc-4.2 configure.cxx=/opt/local/bin/gcc-apple-4.2
+}}}
+
+=== Xcode 4.0 and 4.1 === #xcode40
+
+If a port ''foo'' fails to build and you're using Xcode 4.0 or 4.1, the default compiler is llvm-gcc-4.2; try compiling with clang instead:
+
+{{{
+sudo port clean foo
+sudo port install foo configure.compiler=clang
+}}}
+
+If that fails, try using gcc-4.2:
+
+{{{
+sudo port clean foo
+sudo port install foo configure.compiler=gcc-4.2
+}}}
 
 == man port fails with error message == #manpath
 

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