Boost.Regex with icu/unicode support - c++

Question

How to build Boost.Regex with icu/ unicode support? My compiler is GCC, and IDE is Eclipse C++. How to configure binary files with Eclipse?
I tried to do this "bjam --sHAVE_ICU=1 toolset=gcc". But it did not work.
When i check if icu support is enable with "bjam -has_icu", i still get "has icu builds : no".

Answer 1

I build Boost against ICU using -sICU_PATH=<icuRoot> and -sICU_LINK="-L<icuLibDir>".
I've seen Boost fail to properly detect ICU as well, and have needed to patch the file has_icu_test.cpp (simply return 0 from it's main() function). This will work if you know everything else is set up properly.

Answer 2

Solved the problem by adding directly include path of include ICU directory to cflags when executing b2. For instance:
./b2 --with-regex
cflags="-O0 -I\"$ICU_PATH/include\"
You also may need to add path of ICU lib and moreover full paths to libs to linker. Something like this:
export ICU_LINK="-L\"$ICU_PATH/lib\" -l\"$ICU_PATH/lib/libicudata.a\" -l\"$ICU_PATH/lib/libicui18n.a\" -l\"$ICU_PATH/lib/libicuuc.a\""
./b2 --with-regex
cflags="-O0 -I\"$ICU_PATH/include\"
-sICU_LINK=$ICU_LINK \

Answer 3

Behemoths and Juggernauts
On some unix, this worked for me:
./b2 link=static,shared -sICU_PATH=/usr/local install
In said system, ICU headers are installed in /usr/local/include and ICU libraries in /usr/local/lib
In order to test if you have ICU headers installed (say in /usr/local/include) see if the dir /usr/local/include/unicode/ exists and has lots of header files in it (e.g. symtable.h)
Note that when I followed general advice from then net and passed -sICU_LINK='-L/usr/local/lib' to boost's b2, ICU detection (version 1.62 and 1.63) failed.
In the previous answer, user "NuSkooler" mentions that patching boost file has_icu_test.cpp to simply return 0; short-circuits the test and boost believes all is genkhi with ICU and goes ahead with it.
However make sure you also delete all ICU-related function calls and header files from that file because it is usually the case that has_icu_test.cpp first fails to compile or link because ICU libraries or header files can not be found by boost internals.
With all these, I can confirm that Aegisub's configure now passes the ICU test for me.
(and all these because John Hurt sadly died and I tried to put subtitles in a clip of Heaven's Gate to give to a friend)
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