- change ICU_LINK configuration

[SSE4]

closes: #55

this is basically a port of the following boost.regex commit: boostorg/regex@fc4dc17

summary:

• ICU_LINK is deprecated
• added more granular variables to control ICU library names (ICU_ICUUC_NAME, ICU_ICUDT_NAME, ICU_ICUIN_NAME)
• static ICU is allowed (it's already allowed in regex, no reason to forbid it)

/cc @grafikrobot

[artyom-beilis]

Are you sure about it: https://github.com/boostorg/locale/pull/70/files#diff-54876b48ff1d36d4e9f8ff25a1cb2c9ff33db706dc6eb8b82ca63ae2953daf2dL19

- #error "Mixing ICU with a static runtime doesn't work"
+// #error "Mixing ICU with a static runtime doesn't work"

Unlike regex it needs icudata with all locale information. I recall some issues with it. That without dll it does not have relevant data.

Have you tested it?

Also can somebody help me reviewing the b2 files. I really barely understand them

[grafikrobot]

To be consistent should use either lib or search-lib targets. The regex build uses lib consistently.

[SSE4]

okay, I'll try to change that

[SSE4]

Have you tested it?

I've just run some tests for shared and static ICU builds, both failed...

test_shared.log
test_static.log

I can try to fix them, but only with some guidance, I am not very familiar with boost locale