ld ignores additional pathes - c++

Question

I'm am trying to compile a C++ program that uses Gurobi. The problem is that ld cannot find the library although ldconfig sees it. I also tried to configure the LD_LIBRARY_PATH variable without success
$ sudo ldconfig -v
...
/opt/gurobi701/linux64/lib:
libgurobi.so.7.0.1 -> libgurobi.so.7.0.1
libaes70.so -> libaes70.so
libGurobiJni70.so -> libGurobiJni70.so
...
$ echo $LD_LIBRARY_PATH
:/opt/gurobi701/linux64/lib
$ ld -lgurobi_c++ --verbose
GNU ld (GNU Binutils for Ubuntu) 2.26.1
Émulations prises en charge :
elf_x86_64
elf32_x86_64
elf_i386
elf_iamcu
i386linux
elf_l1om
elf_k1om
i386pep
i386pe
utilisation du script interne d'édition de liens :
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échec de la tentative d'ouverture de //usr/local/lib/x86_64-linux-gnu/libgurobi_c++.so
échec de la tentative d'ouverture de //usr/local/lib/x86_64-linux-gnu/libgurobi_c++.a
échec de la tentative d'ouverture de //lib/x86_64-linux-gnu/libgurobi_c++.so
échec de la tentative d'ouverture de //lib/x86_64-linux-gnu/libgurobi_c++.a
échec de la tentative d'ouverture de //usr/lib/x86_64-linux-gnu/libgurobi_c++.so
échec de la tentative d'ouverture de //usr/lib/x86_64-linux-gnu/libgurobi_c++.a
échec de la tentative d'ouverture de //usr/local/lib64/libgurobi_c++.so
échec de la tentative d'ouverture de //usr/local/lib64/libgurobi_c++.a
échec de la tentative d'ouverture de //lib64/libgurobi_c++.so
échec de la tentative d'ouverture de //lib64/libgurobi_c++.a
échec de la tentative d'ouverture de //usr/lib64/libgurobi_c++.so
échec de la tentative d'ouverture de //usr/lib64/libgurobi_c++.a
échec de la tentative d'ouverture de //usr/local/lib/libgurobi_c++.so
échec de la tentative d'ouverture de //usr/local/lib/libgurobi_c++.a
échec de la tentative d'ouverture de //lib/libgurobi_c++.so
échec de la tentative d'ouverture de //lib/libgurobi_c++.a
échec de la tentative d'ouverture de //usr/lib/libgurobi_c++.so
échec de la tentative d'ouverture de //usr/lib/libgurobi_c++.a
échec de la tentative d'ouverture de //usr/x86_64-linux-gnu/lib64/libgurobi_c++.so
échec de la tentative d'ouverture de //usr/x86_64-linux-gnu/lib64/libgurobi_c++.a
échec de la tentative d'ouverture de //usr/x86_64-linux-gnu/lib/libgurobi_c++.so
échec de la tentative d'ouverture de //usr/x86_64-linux-gnu/lib/libgurobi_c++.a
ld : ne peut trouver -lgurobi_c++
Any ideas?

Answer 1

LD_LIBRARY_PATH is the path where the dynamic loader (ld.so and ld-linux.so on Linux, dyld on OS X) looks up libraries. You need this when you run programs that depend on libraries in non-standard paths.
It doesn't necessarily influence where the linker finds libraries. Use the -L flag to specify the search path for ld:
ld -L/opt/gurobi701/linux64/lib -lgurobi_c++ ...