Integrating XALT with clang compilers

The clang compiler/linker hard codes the path to the linker rather than performing a path search to find the ld program. This means to integrate XALT with clang compiler will require placing an XALT shell script where ld exists and moving the real ld to ld.x

First step is to find what linker clang is calling. An easy way to do that is to compile and link a simple c program:

$ clang -v -o hello hello.c

If you look at the output you’ll see the link line that clang uses. Wherever that is you’ll need to remember the path to that command

Please do the following steps:

1. Remember the directory that is contain the ld that clang is using:

   $ LD_PATH="..."
   

   In other words if the path is /usr/bin/ld then set LD_PATH to “/usr/bin”. Change LD_PATH to suit your site.

2. Typically $LD_PATH/ld is a symlink so:

   $ cd $LD_PATH
   $ ln -s $(readlink ld) ld.x
   

3. If $LD_PATH/ld is a file rather than a symlink then do:

   $ cd $LD_PATH
   $ cp ld ld.x
   

4. Replace $LD_PATH/ld with the file found in the XALT installed directory called: ld.xalt. In other words if XALT is installed in /opt/apps/xalt/xalt then do the following:

   $ cd $LD_PATH
   $ XALT_DIR=/opt/apps/xalt/xalt
   $ rm ld;
   $ cp $XALT_DIR/bin/ld.xalt ld
   

   NOTE: Replace XALT_DIR=/opt/apps/xalt/xalt with wherever you have installed XALT.

5. Test clang linkage with:

   $ XALT_TRACING=link clang -o hello hello.c