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From: Dan Lukes <dan@obluda.cz>
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Subject: Re: building seamonkey with clang
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> 0.      Program arguments: /usr/bin/clang++ -cc1 -triple i386-unknown-freebsd9.0
...
> sr/local/include -fmodule-cache-path /var/tmp/clang-module-cache -O3 -Wall -Wpoi
...
> y/work/comm-release/mailnews/local/src/nsMsgMaildirStore.cpp

You may be interested to know that source will compile with -O0 (instead 
of -O3).

Dan