Newbie: building libgomp

[Amittai Aviram]

I want to create a modified version of libgomp and test it in my native environment, using gcc but my modified libgomp.  I have run into many issues just getting started, and would appreciate some help from this group.  First of all, I want to build GCC so as to build libgomp along the way.  Then, I can modify the libgomp source code, recompile, and use the resulting *.so or *.a file for testing.  Is there a better way?  Anyway, here are the issues I have encountered:

1.   I cannot build GCC.  I have downloaded gcc-4.5.1 and extracted the tar.gz archive.  I created an object directory (gcc_obj-4.5.1) and an install directory (gcc_install-4.5.1) alongside the gcc-4.5.1 directory and entered

$ cd gcc_object-4.5.1
$ ../gcc-4.5.1/configure

Configuration finished without error.  However, note that the top-level Makefile had identified host and target as x86_64-unknown-linux-gnu.  Is that what it should be?  My system has 12 64-bit AMD CPUs and is running under Ubuntu Linux 10.04.1  Why does it say "unknown"?

Anyway, then I entered

$ make

The build process seemed to go fine for ~1 hour (?), but ended this way:

checking for suffix of object files... configure: error: in `/home/afa9/gcc_obj-4.5.1/x86_64-unknown-linux-gnu/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.
make[2]: *** [configure-stage1-target-libgcc] Error 1
make[2]: Leaving directory `/home/afa9/gcc_obj-4.5.1'
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory `/home/afa9/gcc_obj-4.5.1'
make: *** [all] Error 2

What am I supposed to look for in config.log?  And how am I supposed to address this issue?

2.  Meanwhile, there is no libgomp.a or libgomp.so anywhere in my gcc_obj-4.5.1 directory subtree.  Again, is there any way that I can just build these separately?

Thank you!

Amittai

Amittai Aviram
PhD Student in Computer Science
Yale University
646 483 2639
amittai.aviram@yale.edu
http://www.amittai.com