Compiling with CUDA on Ubuntu 16.04 + Solution

[kleinric]

Compiling on a clean install of Ubuntu 16.04 with cmake and using CUDA from the repo.

I get the following error:

/usr/include/string.h: In function ‘void* __mempcpy_inline(void*, const void*, size_t)’: /usr/include/string.h:652:42: error: ‘memcpy’ was not declared in this scope return (char *) memcpy (__dest, __src, __n) + __n; ^ /usr/include/string.h: In function ‘void* __mempcpy_inline(void*, const void*, size_t)’: /usr/include/string.h:652:42: error: ‘memcpy’ was not declared in this scope return (char *) memcpy (__dest, __src, __n) + __n; ^ /usr/include/string.h: In function ‘void* __mempcpy_inline(void*, const void*, size_t)’: /usr/include/string.h:652:42: error: ‘memcpy’ was not declared in this scope return (char *) memcpy (__dest, __src, __n) + __n; ^ /usr/include/string.h: In function ‘void* __mempcpy_inline(void*, const void*, size_t)’: /usr/include/string.h:652:42: error: ‘memcpy’ was not declared in this scope return (char *) memcpy (__dest, __src, __n) + __n; ^ /usr/include/string.h: In function ‘void* __mempcpy_inline(void*, const void*, size_t)’: /usr/include/string.h:652:42: error: ‘memcpy’ was not declared in this scope return (char *) memcpy (__dest, __src, __n) + __n; ^ /usr/include/string.h: In function ‘void* __mempcpy_inline(void*, const void*, size_t)’: /usr/include/string.h:652:42: error: ‘memcpy’ was not declared in this scope return (char *) memcpy (__dest, __src, __n) + __n; ^ /usr/include/string.h: In function ‘void* __mempcpy_inline(void*, const void*, size_t)’: /usr/include/string.h:652:42: error: ‘memcpy’ was not declared in this scope return (char *) memcpy (__dest, __src, __n) + __n; ^ CMake Error at cuda_compile_generated_sgd_solver.cu.o.cmake:266 (message): Error generating file /opt/caffe/build/src/caffe/CMakeFiles/cuda_compile.dir/solvers/./cuda_compile_generated_sgd_solver.cu.o
Seems TensorFlow has similar issues: https://github.com/fayeshine/tensorflow/commit/6c8c572c12521d706eda692fa7793f90b45dde20

By adding that flag to my CMakeLists.txt it fixed the problem and compiles fine. ie. Add this near the front:
set(${CMAKE_CXX_FLAGS} "-D_FORCE_INLINES ${CMAKE_CXX_FLAGS}")

Someone might be able to add this to the cmake file.

[lukeyeager]

This helped me and several other users on 16.04 as well:
https://groups.google.com/d/msg/caffe-users/Tm3OsZBwN9Q/XKGRKNdmBAAJ

EDIT

The CUDA 8.0 RC works great. Just use that.

[neouyghur]

I have same problem, but the solution is not working for me.

[neouyghur]

At first this solution does not work, however after I have download the newest Caffe, then compile with this modification it works. But I still got some error at undefined reference to `lzma_index_end@XZ_5.0'.

[macfer]

It worked for me on 16.04 but I added the flag to Makefile rather then to CMakeLists.txt as I had some other workarounds applied to Makefile.config and wasn't interested in switching to cmake build.

If you are compiling with make then edit Makefile and replace the line
NVCCFLAGS += -ccbin=$(CXX) -Xcompiler -fPIC $(COMMON_FLAGS)
with
NVCCFLAGS += -D_FORCE_INLINES -ccbin=$(CXX) -Xcompiler -fPIC $(COMMON_FLAGS).

[swearos]

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_FORCE_INLINES"),
add the line in the front of the CMakeLists.txt
the gcc is too new;

[bipedalBit]

@macfer thanks a lot. It seems Makefile configuring methods really counts.