Ubuntu
zlib package

Undefined reference to zlib in Ubuntu 11.10

Asked by Justin

For our project CMake ends up creating a command like:
/usr/bin/c++ -Wall -Wextra -Wno-missing-field-initializers -Werror -Wno-unused-parameter -pipe -fPIC -mtune=core2 -mfpmath=sse -g -O0 -lXxf86vm CMakeFiles/BulkDataEditor.dir/BulkDataEditor.cpp.o CMakeFiles/BulkDataEditor.dir/BulkDataEditorMain.cpp.o CMakeFiles/BulkDataEditor.dir/BulkDataEditorRegistration.cpp.o CMakeFiles/BulkDataEditor.dir/DiscreteValueManager.cpp.o CMakeFiles/BulkDataEditor.dir/moc_BulkDataEditor.cxx.o -o ../../../bin/BulkDataEditor -Wl,--start-group -rdynamic -L/mnt/data/Projects/WeatherscapeXT/trunk/Build/ThirdParty/lib -lz
<bunch of third party libraries>
-Wl,--end-group

This built fine in 11.04 but under 11.10 it fails with:
undefined reference to symbol 'inflateInit2_'
/usr/bin/ld: note: 'inflateInit2_' is defined in DSO /usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../x86_64-linux-gnu/libz.so so try adding it to the linker command line
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../x86_64-linux-gnu/libz.so: could not read symbols: Invalid operation

During cmake build step I can see zlib has been found successfully using cmake 2.8.5
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.3.4")

Removing the -lz from the build line I get a bunch of errors showing that zlib isn't referenced (as I would expect). So what is special about inflateInit2_?

../../Components/Zip/liblibZip.a(ZipArchive.cpp.o): In function `WeatherscapeXT::ZipArchive::open()':
/mnt/data/Projects/WeatherscapeXT/trunk/Source/Components/Zip/ZipArchive.cpp:53: undefined reference to `unzOpen'
/mnt/data/Projects/WeatherscapeXT/trunk/Source/Components/Zip/ZipArchive.cpp:61: undefined reference to `zipOpen'
../../Components/Zip/liblibZip.a(ZipArchive.cpp.o): In function `WeatherscapeXT::ZipArchive::close()':
/mnt/data/Projects/WeatherscapeXT/trunk/Source/Components/Zip/ZipArchive.cpp:79: undefined reference to `unzCloseCurrentFile'
/mnt/data/Projects/WeatherscapeXT/trunk/Source/Components/Zip/ZipArchive.cpp:84: undefined reference to `zipClose'
../../Components/Zip/liblibZip.a(ZipArchive.cpp.o): In function `WeatherscapeXT::ZipArchive::listFiles()':
/mnt/data/Projects/WeatherscapeXT/trunk/Source/Components/Zip/ZipArchive.cpp:93: undefined reference to `unzGetGlobalInfo'
/mnt/data/Projects/WeatherscapeXT/trunk/Source/Components/Zip/ZipArchive.cpp:101: undefined reference to `unzGoToFirstFile'
/mnt/data/Projects/WeatherscapeXT/trunk/Source/Components/Zip/ZipArchive.cpp:108: undefined reference to `unzGetCurrentFileInfo'
/mnt/data/Projects/WeatherscapeXT/trunk/Source/Components/Zip/ZipArchive.cpp:125: undefined reference to `unzGoToNextFile'

Thanks

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Revision history for this message
Manfred Hampl (m-hampl) said : 		#1

The combination of messages

"Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.3.4")"
"/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../x86_64-linux-gnu/libz.so: could not read symbols"

can perhaps be caused by the file being there but being broken.

As a first idea try reinstalling zlib1g-dev.

Revision history for this message
Justin (justinr) said : 		#2

Yup I tried that but it didn't work. I'll attempt to compile one manually and see what I get

Revision history for this message
Simon (simonhyll) said : 		#3

If you download the sources of ZLib and do a simple "grep -irl unzGoToFirstFile" you'll find that no, unzGoToFirstFile is not part of ZLib. It is however part of a contrib library found inside the ZLib sources called minizip. Minizip requires separate compilation and you need to link towards that as well.

I solved this by adding the following to the ZLib CMakeListst.txt file:

set(UNZIP_SOURCES "contrib/minizip/unzip.c"
"contrib/minizip/zip.c"
"contrib/minizip/ioapi.c")
set(UNZIP_HEADERS "contrib/minizip/unzip.h"
"contrib/minizip/zip.h"
"contrib/minizip/ioapi.h")

add_library(unzip STATIC
"${UNZIP_SOURCES}"
"${UNZIP_HEADERS}")

target_link_libraries(unzip zlibstatic)

    install(TARGETS unzip
        RUNTIME DESTINATION "${INSTALL_BIN_DIR}"
        ARCHIVE DESTINATION "${INSTALL_LIB_DIR}"
        LIBRARY DESTINATION "${INSTALL_LIB_DIR}" )

    install(FILES ${UNZIP_HEADERS} DESTINATION "${CMAKE_INSTALL_PREFIX}/include")

Then you have to link towards the resulting libunzip.a library.

You can easily modify the above code to link a shared library, just rename zlibstatic to just zlib, and replace STATIC with SHARED

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