如何使用 g++ 生成确定性二进制输出?

I work in a very regulated environment where we need to be able to produce identical binary input give the same source code every time be build out products. We currently use an ancient version of g++ that has been patched to not write anything like a date/time in the resulting binaries that would change from build to build, but I would like to update to g++ 4.7.2. Does anyone know of a patch, or have suggestions of what I need to look for to take two identical pieces of source code and produce identical binary outputs?

解决方案

We also depend on bit-identical rebuilds, and are using gcc-4.7.x.

Besides setting PWD=/proc/self/cwd and using -frandom-seed=<input-file-name>, there are a handful of patches, which can be found in svn://gcc.gnu.org/svn/gcc/branches/google/gcc-4_7 branch.