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POLinking to boost through SConstruct
 

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  1. POLinking to boost through SConstruct
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    <p>I'm trying to work on a cross-platform project that uses boost for the file/directory operations. I've been using visual studio, but in order to compile on linux, I've decided to switch to SConstruct.</p> <p>I cannot [correctly?] link to the filesystem library however.</p> <p>my SConstruct file is as follow:</p> <pre><code>vLibs = [ 'libboost_system-vc100-mt-1_44.lib', 'libboost_filesystem-vc100-mt-1_44.lib']; # LIBS=vLibs, env = Environment(); env.AppendUnique(CXXFLAGS=Split("/EHsc")); env.Append(CPPPATH = ["C:\\Program Files (x86)\\boost\\boost_1_44"]); env.Append(LIBPATH = ["C:\\Program Files (x86)\\boost\\boost_1_44\\lib"]); env.Program( Glob('test.cpp'),LIBS=vLibs) </code></pre> <p>I keep getting errors like</p> <blockquote> <p>test.obj : error LNK2019: unresolved external symbol "class boost::system::error_category const &amp; __cdecl boost::system::generic_category(void)" (?generic_category@system@boost@@YAAEBVerror_category@12@XZ) referenced in function "void __cdecl boost::system::`dynamic initializer for 'posix_category''(void)" (??__Eposix_category@system@boost@@YAXXZ)</p> </blockquote> <p>If I use visual studio, I get similar errors:</p> <blockquote> <p>Error 2 error LNK2001: unresolved external symbol "class boost::system::error_category const &amp; __cdecl boost::system::generic_category(void)" (?generic_category@system@boost@@YAABVerror_category@12@XZ) T:\VS\temp\test.obj temp</p> </blockquote> <p>Until I add the libraries to the project, after which the errors go away and it compiles fine (in visual studio not SConstruct). </p> <p>I've tried every combination of the libraries (shared/unshared/runtime-shared/runtime-unshared/debug), but I always get the same errors. </p> <p>I've been searching for an answer for the last 6+ hours, so I'm grateful for any help.</p> <p>NOTE: I'm not using autolinking (#define BOOST_ALL_NO_LIB) because gcc doesn't support it)</p> <p>Here's the output of Scons:</p> <pre><code>scons: Reading SConscript files ... scons: done reading SConscript files. scons: Building targets ... link /nologo /OUT:build\test.exe "/LIBPATH:C:\Program Files (x86)\boost\boost_1_44\lib" libboost_system-vc100-mt-1_44.lib libboost_filesystem-vc100-mt-1_44.lib build\test.obj test.obj : error LNK2019: unresolved external symbol "class boost::system::error_category const &amp; __cdecl boost::system::generic_category(void)" (?generic_category@system@boost@@YAAEBVerror_category@12@XZ) referenced in function "void __cdecl boost::system::`dynamic initializer for 'posix_category''(void)" (?? __Eposix_category@system@boost@@YAXXZ) test.obj : error LNK2019: unresolved external symbol "class boost::system::error_category const &amp; __cdecl boost::system::system_category(void)" (?system_category@system@boost@@YAAEBVerror_category@12@XZ) referenced in function "void __cdecl boost::system::`dynamic initializer for 'native_ecat''(void)" (?? __Enative_ecat@system@boost@@YAXXZ) build\test.exe : fatal error LNK1120: 2 unresolved externals scons: *** [build\test.exe] Error 1120 scons: building terminated because of errors. </code></pre>
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    1. COPlease post the link command line that scons is generating. Usually `LIBS` is a list of library names (e.g. `boost_system-vc100-mt-1_44`), not the full filenames.
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      1. USDave Bacher
    2. COYeah, the lib extension shouldn't be on there, but it makes no difference either way - it gives the same errors without the extension. Here I copied the names verbatim to make sure that it worked in Visual Studio but not in scons.
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    3. COAnother guess: A previous question (http://stackoverflow.com/questions/1066071/boost-linker-error-unresolved-external-symbol-class-boostsystemerror-catego) hints that it might be architecture problems: 32-bit vs 64-bit libraries.
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