libproc is built (and, in particular, linked) with -ffast-math. That pulls in crtfastmath.o, which sets the flush-to-zero flag (on x86) for which causes hilarity when you innocently link against libproc. This is IMO so bad that I'm filing a GCC bug about it. Fedora 18 should be unaffected because the package is completely gone. In the mean time, please patch out the -ffast-math option.
Hello Andy. Could you please tell me more about those hilarities you've experienced? Thank you. Regards, Jaromir.
I have a financial program that (unsurprisingly) does math. I added a feature that involved linking against libproc. A while later, I noticed that floating-point math was behaving oddly. After much cursing and modifying ld-linux to figure out what was going on, I figured out that libproc had an initializer that set the flush-to-zero and denormals-are-zero bits. Oops. There's nothing wrong with compiling with -ffast-math, but linking with -ffast-math is bad when you're a shared library.
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As noted, this is fixed in Fedora 18.