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Compiling GNU Prolog 1.4.0 on MacOS X 10.7 (Lion)

From: Paulo Moura
Subject: Compiling GNU Prolog 1.4.0 on MacOS X 10.7 (Lion)
Date: Sun, 31 Jul 2011 20:03:47 +0100


This message is only of interest for MacOS X users that have upgraded to Lion 
(MacOS X 10.7) and which to compile GNU Prolog 1.4.0 from sources.

Lion's Xcode 4.1 changes the default C compiler from gcc-4.2 to llvm-gcc-4.2. 
The first part of the workaround for now is, you guessed it, to revert to 
gcc-4.2 when compiling GNU Prolog. If you're using MacPorts, you can patch the 
swi-prolog-devel portfile by adding the following lines:

platform darwin 11 {
        configure.compiler gcc-4.2

If you're not using MacPorts, you should be able to set the CC environment 
variable to gcc-4.2.

The issue with the default llvm-gcc-4.2 compiler (which also affects other 
Prolog compilers such as YAP and SWI-Prolog) seems to be related to memory 

The second part of the workaround is to patch configure to make it aware of 
Lion. Open the configure file in a text editor and search for the two 
occurrences of the "darwin10" string, replacing it by "darwin1".



Paulo Jorge Lopes de Moura, PhD
Assistant Professor
Dep. of Computer Science, University of Beira Interior
6201-001 Covilhã, Portugal

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