Openblas linking broken on Arch

[daniandtheweb]

Using Arch and trying to build the latest commit with openblas cmake outputs this error:

/home/daniandtheweb/Applications/chat/llama.cpp/ggml.c:1082:13: warning: ‘quantize_row_q4_2_reference’ defined but not used [-Wunused-function]
 1082 | static void quantize_row_q4_2_reference(const float * restrict x, block_q4_2 * restrict y, int k) {
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~
[  4%] Built target ggml
[  9%] Building CXX object CMakeFiles/llama.dir/llama.cpp.o
[ 13%] Linking CXX static library libllama.a
[ 13%] Built target llama
[ 18%] Building C object tests/CMakeFiles/test-quantize.dir/test-quantize.c.o
[ 22%] Linking CXX executable ../bin/test-quantize
/usr/bin/ld: ../libllama.a(ggml.c.o): in function `ggml_compute_forward_mul_mat_f16_f32':
ggml.c:(.text+0x7fdb): undefined reference to `cblas_sgemm'
/usr/bin/ld: ../libllama.a(ggml.c.o): in function `ggml_compute_forward_mul_mat_q_f32':
ggml.c:(.text+0x89cc): undefined reference to `cblas_sgemm'
/usr/bin/ld: ../libllama.a(ggml.c.o): in function `ggml_compute_forward':
ggml.c:(.text+0xf07a): undefined reference to `cblas_sgemm'
collect2: error: ld returned 1 exit status
make[2]: *** [tests/CMakeFiles/test-quantize.dir/build.make:98: bin/test-quantize] Error 1
make[1]: *** [CMakeFiles/Makefile2:1055: tests/CMakeFiles/test-quantize.dir/all] Error 2
make: *** [Makefile:101: all] Error 2

[Piezoid]

See #634: on Arch Linux, openblas doesn't have the cblas interface enabled. The solution is to compile openblas-lapack from AUR.

[daniandtheweb]

Hadn't found that issue before, thanks!

[CubeTheThird]

It looks like this will no longer be an issue with an upcoming release of the openblas packages:

https://lists.archlinux.org/archives/list/arch-dev-public@lists.archlinux.org/thread/REXPJGNLOMBZAB47D5JYX4B3TM62YJTD/