id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
1083	boost_regex 1.34.0 uses ICU library without linking to it	bero@…	John Maddock	"g++ test.cpp -lboost_regex

results in

/usr/lib/libboost_regex.so: undefined reference to `icu_3_4::Collator::createInstance(icu_3_4::Locale const&, UErrorCode&)'
/usr/lib/libboost_regex.so: undefined reference to `icu_3_4::Locale::Locale()'
/usr/lib/libboost_regex.so: undefined reference to `u_tolower_3_4'
/usr/lib/libboost_regex.so: undefined reference to `icu_3_4::Locale::~Locale()'
/usr/lib/libboost_regex.so: undefined reference to `u_isspace_3_4'
/usr/lib/libboost_regex.so: undefined reference to `icu_3_4::Locale::Locale(icu_3_4::Locale const&)'
/usr/lib/libboost_regex.so: undefined reference to `u_isblank_3_4'
/usr/lib/libboost_regex.so: undefined reference to `u_digit_3_4'
/usr/lib/libboost_regex.so: undefined reference to `u_charType_3_4'                                                           
/usr/lib/libboost_regex.so: undefined reference to `u_charFromName_3_4'

Of course a simple workaround is to use

g++ test.cpp -lboost_regex -licu, but that linkage should really be in the library itself, it makes using it easier and allows prelinking to work correctly.
"	Bugs	closed	To Be Determined	regex	Boost 1.34.0	Problem	worksforme