issue Linking CXX shared library libglog.so

[fpalaric]

Hello,
i have build gflags' files with : cmake -DINTTYPES_FORMAT:STRING=C99 -DNAMESPACE:STRING=google -DCMAKE_INSTALL_PREFIX=../../Install/gflags -DBUILD_SHARED_LIBS=ON ../../gflags

Then, i have added : set (CMAKE_POSITION_INDEPENDENT_CODE ON) to the CMakefile.txt
which, i believe, add the -fPic compile option.

i have the following error :

[ 24%] Built target glog_internal
[ 27%] Linking CXX shared library libglog.so
/usr/bin/ld: /home/franck/Dev/LibLivre/Build/..Install/gflags/lib/libgflags.a(gflags_completions.cc.o): warning: relocation against `_ZN3fLS25FLAGS_tab_completion_wordB5cxx11E' in read-only section `.text.startup'
/usr/bin/ld: /home/franck/Dev/LibLivre/Build/..Install/gflags/lib/libgflags.a(gflags.cc.o): relocation R_X86_64_PC32 against symbol `stderr@@GLIBC_2.2.5' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: bad value
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/glog.dir/build.make:96: libglog.so.0.7.0] Error 1
make[1]: *** [CMakeFiles/Makefile2:889: CMakeFiles/glog.dir/all] Error 2
make: *** [Makefile:166: all] Error 2

I looking for solutions but i run out of ideas... i didn't know if i manage well to "recompile with -fPic", i do not know what is fPic, i have googled it and there is no result...
Any idea ?

[sergiud]

The linker error message indicates that, in fact, you did not compile gflags using -fPIC which can be easily verified by inspecting the command-line used by the compiler.

Please ask the gflags folks how can this be best achieved or use the search function. This issue popped up several times in the past; see #680 #661 #174 #819.