Re: [boost] compiling Boost boost_1_45_0 regex with icu (redhat). A problem and its fix.

Subject: Re: [boost] compiling Boost boost_1_45_0 regex with icu (redhat). A problem and its fix.
From: Vladimir Prus (vladimir_at_[hidden])
Date: 2011-01-04 10:21:19

Candid Shot wrote:

> (I am listing a problem in compling boost/regex, and a solution, and want to
> know if this is the right approach. We are trying to use boost as a static
> library, with regex and icu support. Thanks. =cs)
> 
> Here used is the vanilla static compile of ICU (i.e. no changes to
> icu4c-4_6-src.tgz), installed in subdirectory icu2 as:
> 
> ./bootstrap.sh --with-icu=/home/cxs/icu2 --prefix=osboost
> --without-libraries=python link=static variant=release
> 
> ====================================================================
> 
> $ ./bjam --list-libraries -d+2
> 
> ....
> ....
> gcc.compile.c++ bin.v2/libs/regex/build/gcc-4.1.2/debug/has_icu_test.o
> 
>     "g++"  -ftemplate-depth-128 -O0 -fno-inline -Wall -pedantic -g -fPIC
> -DBOOST_ALL_NO_LIB=1 -DBOOST_HAS_ICU=1  -I"." -I"/home/cxs/icu2/include" -c -o
> "bin.v2/libs/regex/build/gcc-4.1.2/debug/has_icu_test.o"
> "libs/regex/build/has_icu_test.cpp"
> 
> libs/regex/build/has_icu_test.cpp:26:2: warning: no newline at end of file
> libs/regex/build/has_icu_test.cpp: In function 'int main()':
> libs/regex/build/has_icu_test.cpp:24: warning: unused variable 'c'
> 
> gcc.link bin.v2/libs/regex/build/gcc-4.1.2/debug/has_icu
> 
>     "g++" -L"/home/cxs/icu2/lib" -Wl,-R -Wl,"/home/cxs/icu2/bin" -Wl,-R
> -Wl,"/home/cxs/icu2/lib" -Wl,-rpath-link -Wl,"/home/cxs/icu2/lib" -o
> "bin.v2/libs/regex/build/gcc-4.1.2/debug/has_icu" -Wl,--start-group
> "bin.v2/libs/regex/build/gcc-4.1.2/debug/has_icu_test.o"  -Wl,-Bstatic
> -Wl,-Bdynamic -licuuc -licui18n -licudata -Wl,--end-group -g
> 
> 
> /home/cxs/icu2/lib/libicuuc.a(putil.ao): In function `uprv_dl_sym_46':
> putil.c:(.text+0x241): undefined reference to `dlsym'
> /home/cxs/icu2/lib/libicuuc.a(putil.ao): In function `uprv_dl_open_46':
> putil.c:(.text+0x2a6): undefined reference to `dlopen'
> /home/cxs/icu2/lib/libicuuc.a(putil.ao): In function `uprv_dl_close_46':
> putil.c:(.text+0x269): undefined reference to `dlclose'
> collect2: ld returned 1 exit status
> ...failed updating 1 target...
> Performing configuration checks
> 
>     - has_icu builds           : no
> ....
> ....
> 
> (So icu is not detected due to a missing -ldl flag in the last call to g++
> above.)
> ====================================================================
> 
> This issue is taken care of by adding to libs/regex/build/Jamfile.v2 these lines
> 
> 
> to the else clause of
> 
> if $(ICU_LINK) {...}
> else {
> 
>       lib dl : : <search>$(ICU_PATH)/lib <link>shared <runtime-link>shared ;
>       lib dl : : <toolset>msvc <variant>debug <name>dl <search>$(ICU_PATH)/lib
> <link>shared <runtime-link>shared ;
>       lib dl : : <name>this_is_an_invalid_library_name ;
>       ...
> }
> 
> and  add to ICU_OPTS =  <library>dl/<link>shared/<runtime-link>shared
> 
> 
> The question is: is this the correct approach? Thanks,

I think the ideal approach is to build shared ICU libraries. Alternatively,
can you check whether ICU build you have appears to include .pc files and
whether those .pc files mention dependency in 'dl'?

- Volodya