I'm trying to compile a threaded C program with a cross compiler that has this setting. I read in several places what this means for C++ programs, but couldn't find any reference for pure C programs. in particular, I didn't find any documentation related to this, even in the gcc-internals manuals. any pointers? -- Lic. Marcos Dione Engineer Expert - Hop Project http://hop.inria.fr/ INRIA Sophia Antipolis - Méditerranée Phone: +33 (0)4 92 38 79 67