boost_regex Cannot build with ICU support

[malirod]

Package and Environment Details (include every applicable attribute)

• Package Name/Version: boost_regex /1.69
• Operating System+version: Linux Ubuntu 18.10
• Compiler+version: clang 7
• Docker image: conanio/gcc7
• Conan version: conan 1.12.2
• Python version: Python 3.7.0

###1. conanfile.txt (static)

[requires]
boost_regex/1.69.0@bincrafters/stable

[options]
boost_regex:use_icu=True
boost_regex:shared=False
icu:shared=False
icu:with_unit_tests=False

[generators]
cmake_find_package
cmake_paths

During build of the boost regex in cosole

[cmake] Performing configuration checks
[cmake] 
[cmake]     - has_icu builds           : no

in the build log "~/.conan/data/boost_regex/1.69.0/bincrafters/stable/build/4ac79257f1cb90eb553eb4a339227e24d468a06a/bin/config.log"

...updating 7 targets...                                                                                                                                                                               
   4 clang-linux.compile.c++.without-pch bin/regex/build/bd861a9baa57b5f260b512cfa257e7fb/has_icu_test.o                                                                                                    
   5 clang-linux.link bin/regex/build/bd861a9baa57b5f260b512cfa257e7fb/has_icu                                                                                                                              
   6 /usr/bin/ld: /home/malirod/.conan/data/icu/63.1/bincrafters/stable/package/038c2a260c5a4890e52ed4ef6e1716e1c793406e/lib/libicuuc.a(putil.ao): in function `uprv_dl_open_63':                           
   7 putil.cpp:(.text.uprv_dl_open_63+0x13): undefined reference to `dlopen'                                                                                                                                
   8 /usr/bin/ld: /home/malirod/.conan/data/icu/63.1/bincrafters/stable/package/038c2a260c5a4890e52ed4ef6e1716e1c793406e/lib/libicuuc.a(putil.ao): in function `uprv_dl_close_63':                          
   9 putil.cpp:(.text.uprv_dl_close_63+0x7): undefined reference to `dlclose'                                                                                                                               
  10 /usr/bin/ld: /home/malirod/.conan/data/icu/63.1/bincrafters/stable/package/038c2a260c5a4890e52ed4ef6e1716e1c793406e/lib/libicuuc.a(putil.ao): in function `uprv_dlsym_func_63':                        
  11 putil.cpp:(.text.uprv_dlsym_func_63+0xe): undefined reference to `dlsym'                                                                                                                               
  12 clang: error: linker command failed with exit code 1 (use -v to see invocation)                                                                                                                        
  13                                                                                                                                                                                                        
  14     "/usr/bin/clang++-7" -L"/home/malirod/.conan/data/icu/63.1/bincrafters/stable/package/038c2a260c5a4890e52ed4ef6e1716e1c793406e/lib"   -o "bin/regex/build/bd861a9baa57b5f260b512cfa257e7fb/        
     has_icu" -Wl,--start-group "bin/regex/build/bd861a9baa57b5f260b512cfa257e7fb/has_icu_test.o"  -Wl,-Bstatic  -Wl,-Bdynamic -lrt -licudata -licui18n -licuuc -Wl,--end-group -m64 -pthread -std=c++11 -  
     stdlib=libstdc++                                                                                                                                                                                       
  15                                                                                                                                                                                                        
  16 ...failed clang-linux.link bin/regex/build/bd861a9baa57b5f260b512cfa257e7fb/has_icu...                                                                                                                 
  17 ...skipped <pbin/regex/build/bd861a9baa57b5f260b512cfa257e7fb>has_icu.passed for lack of <pbin/regex/build/bd861a9baa57b5f260b512cfa257e7fb>has_icu...                                                 
  18 ...failed updating 1 target...

###2. conanfile.txt (dynamic)

[requires]
boost_regex/1.69.0@bincrafters/stable

[options]
boost_regex:use_icu=True
boost_regex:shared=True
icu:shared=True
icu:with_unit_tests=False

[generators]
cmake_find_package
cmake_paths

build output

[cmake] Performing configuration checks
[cmake] 
[cmake]     - has_icu builds           : no

build log:

clang-linux.compile.c++.without-pch bin/regex/build/c42c822ef99384bff4ac74b5386002b0/has_icu_test.o                                                                                                    
   5 clang-linux.link bin/regex/build/c42c822ef99384bff4ac74b5386002b0/has_icu                                                                                                                              
   6 testing.unit-test bin/regex/build/c42c822ef99384bff4ac74b5386002b0/has_icu.passed                                                                                                                      
   7 bin/regex/build/c42c822ef99384bff4ac74b5386002b0/has_icu: error while loading shared libraries: libicuuc.so.63: cannot open shared object file: No such file or directory                              
   8                                                                                                                                                                                                        
   9 ····                                                                                                                                                                                                   
  10      "bin/regex/build/c42c822ef99384bff4ac74b5386002b0/has_icu"  && touch  "bin/regex/build/c42c822ef99384bff4ac74b5386002b0/has_icu.passed"                                                           
  11                                                                                                                                                                                                        
  12 ...failed testing.unit-test bin/regex/build/c42c822ef99384bff4ac74b5386002b0/has_icu.passed...                                                                                                         
  13 ...failed updating 1 target... 

Im not sure whether this problem relates to conan or this is boost iteself.

[SSE4]

it seems like command line misses -ldl to link with dl library. not sure yet where to apply fix, need to investigate

[malirod]

Adding -ldl manually will help (this was my first guess). But Im not sure this is way to go. For me the following looks strange -Wl,-Bstatic -Wl,-Bdynamic . And this is for static build. For dynamic build this might not work.

[malirod]

Interesting facs. Seems boost local depends on regex. In the same env replace regex with locale boost_locale/1.69.0@bincrafters/stable and got regex with icu

[cmake] Performing configuration checks
[cmake] 
[cmake]     - has_icu builds           : yes
[cmake] 
[cmake] ...patience...
[cmake] 
[cmake] ...found 630 targets...
[cmake] ...updating 25 targets...
[cmake] 
[cmake] clang-linux.compile.c++.without-pch bin/regex/build/bd861a9baa57b5f260b512cfa257e7fb/c_regex_traits.o
[cmake] 
[cmake] clang-linux.compile.c++.without-pch bin/regex/build/bd861a9baa57b5f260b512cfa257e7fb/cpp_regex_traits.o

[solvingj]

@malirod boost_locale doesn't depend on regex (perhaps you meant it depends on icu) . Still, we only pre-build with icu off for both regex and locale, so I'm not sure how it would be related. Did you possibly install ICU to some system folder and now it's being detected by b2?

Of note, I'm bumping the dependency on ICU to 63.1 on the 1.69.0 testing branch which I meant to do earlier.

Also, i found this bug regarding ICU and -ldl:
https://bugs.swift.org/browse/SR-3819