ld linker error "cpu model hidden symbol" - c++

Question

I'm getting an ld error when attempting to compile an sfml program on ubuntu 16.04. This is apparently a known issue, and there is supposed to be a workaround, but I don't understand what is it...
http://web.archive.org/web/20160509014317/https://gitlab.peach-bun.com/pinion/SFML/commit/3383b4a472f0bd16a8161fb8760cd3e6333f1782.patch
The error spat out by ld is
hidden symbol `__cpu_model' in /usr/lib/gcc/x86_64-linux-gnu/4.9/libgcc.a(cpuinfo.o) is referenced by DSO
There is no relevant code to this - as I understand it this error is produced on all ubuntu 16.04 systems with g++ 5, if the program to be linked contains objects such as sf::Texture and sf::Sprite. (I don't know any more detail than this.)
I have tried also compiling with g++ 4.9, but the same error occurs.
My compile line is g++-4.9 --std=c++11 -Wall main.cpp -lsfml-graphics -lsfml-window -lsfml-system -o a.out
Has anyone else experienced this error and resolved it successfully?

Answer 1

I've had to fix this issue several times. Instead of applying the patch, you can manually fix it by editing the file SFML/src/SFML/Graphics/CMakeLists.txt. At line 149, you will find the following:
if(SFML_COMPILER_GCC)
set_source_files_properties(${SRCROOT}/ImageLoader.cpp PROPERTIES COMPILE_FLAGS -fno-strict-aliasing)
endif()
After the endif(), insert the following:
if(SFML_COMPILER_GCC AND BUILD_SHARED_LIBS)
list(APPEND GRAPHICS_EXT_LIBS "-lgcc_s -lgcc")
endif()
Then, in the top-level SFML folder, run the following:
mkdir build && cd build
cmake .. -DSFML_BUILD_EXAMPLES=ON -DSFML_BUILD_DOCS=ON
make
sudo make install
sudo ldconfig
This will get it built and installed without the compiler error. (Note: Remove the -D flags from cmake if you don't want docs or examples)

Answer 2

I ran this in the SFML source directory before running the standard cmake...make:
curl https://gitlab.peach-bun.com/pinion/SFML/commit/3383b4a472f0bd16a8161fb8760cd3e6333f1782.patch \
| patch -p1
and that solved the problem

Answer 3

I've got the same linker error when trying to build SFML 2.4.2 with examples, specifically with opengl and shader ones.
Inspired by the #Joshua solution, I tried to change the compiler from GCC to Clang. It worked.
I am sharing here because it seems to be a simpler solution if you have no restrictions to use Clang.
Just download SFML and change to its directory. And...
mkdir build && cd build
cmake .. -DSFML_BUILD_EXAMPLES=ON -DCMAKE_CXX_COMPILER=clang++
make
sudo make install
sudo ldconfig

Answer 4

Removing -fvisibility=hidden from compiler options worked for me.