Date: Sun, 14 Nov 2010 23:29:45 +0100 From: Erik Cederstrand <erik@cederstrand.dk> To: freebsd-toolchain@freebsd.org Subject: Clang and -frandom-seed Message-ID: <E135940E-F79C-4DFA-811D-18CCBF3C609E@cederstrand.dk>
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Hello toolchainers, I noticed that two consecutive builds of (GCC-built) Clang don't produce identical binaries. This is true for clang, clang++ and tblgen. I asked on the llvm-dev list yesterday, and it turns out it's because GCC uses a random seed on some symbols. Apparently, this can be controlled with the -frandom-seed flag. I haven't tested if this is also the case for Clang-built Clang. I'm not sure I understand the exact implications, but I'm wondering if we could add the flag to the build scripts in FreeBSD in a way that both satisfies the randomness criteria and makes builds deterministic? Thanks, Erikhelp
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