On Ubuntu 11.10 amd64 with g++ (and gcc) 4.6.1, I built ICU 4.8.1 with almost all default options except for specifying a non-default installation dir. Then I created the LD_LIBRARY_PATH environment variable and set it to the lib dir of that new ICU installation *but did not* also create an ICU_PATH environment variable. Then I ran the boost bootstrap.sh script with a '--with-icu=/home/martin/app/icu/installation' parameter. The output of the b2 contained (among other things) the following bits about ICU: - has_icu builds : yes ... - icu : no - icu (lib64) : no
Which led me to expect that the boost regex libs would end up referencing the Ubuntu default ICU libs (which was not what I wanted to do). But they didn't, instead they *did* correctly reference the newly built ICU libraries (or at least that's how I'm interpreting the output of ldd against libboost_regex.so ). Which is nice, but doesn't that also mean that the docs in Boost regex about the ICU_PATH environment variable might need some revision? Or did I just luck out somehow?
I think you lucked out - or more likely the default system libraries were used - the regex configure script only searches the compiler's default paths unless you also set ICU_PATH. Setting LD_LIBRARY_PATH will have no effect BTW. HTH, John.