I downloaded and built (seemingly correctly) the relevant BLAS and CBLAS libraries (from netlib.org/blas) in my Linux Fedora environment. The result of this was a blas_LINUX.a file, which I renamed libblas.a and copied to \usr\local\lib, and a cblas.h file which I copied to \usr\include. I subsequently tried referencing this in a CMakeList.txt file in a CLion project. The file is as follows:
project(test C)
cmake_minimum_required(VERSION 3.10)
set(CMAKE_C_STANDARD 99)
include_directories(include)
add_executable(${PROJECT_NAME} src/main.c)
find_library(blas libblas.a /usr/local/lib)
MESSAGE(STATUS "CBLAS location is: " ${blas})
target_link_libraries(${PROJECT_NAME} ${blas})
Going by the message that cmake produces when reloaded, the cblas library seems to get found fine. However when I try and run my application, I get the following linker error message:
undefined reference to `cblas_dgemm`
Following are the contents of my main.c file
#include <stdio.h>
#include <stdlib.h>
#include <cblas.h>
int main(int arg, char *args[]) {
.
.
.
printf("Processing cblas_dgemm matrix multiplication.\n");
cblas_dgemm(CblasRowMajor, CblasNoTrans, CblasNoTrans, N, N, N, alpha, A[0], N, B[0], N, beta, C[0], N);
.
.
.
return 0;
}
I'm not entirely sure where I'm going wrong here. I'm very new using cmake, and I'm going around in circles trying to figure out what the problems is, when searching online. Any pointers in the right direction would be greatly received, and appreciated.
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Id flags:
The output was:
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arg [/usr/lib/gcc/x86_64-redhat-linux/9/../../../../lib64/crti.o] ==> ignore
arg [/usr/lib/gcc/x86_64-redhat-linux/9/crtbegin.o] ==> ignore
arg [-L/usr/lib/gcc/x86_64-redhat-linux/9] ==> dir [/usr/lib/gcc/x86_64-redhat-linux/9]
arg [-L/usr/lib/gcc/x86_64-redhat-linux/9/../../../../lib64] ==> dir [/usr/lib/gcc/x86_64-redhat-linux/9/../../../../lib64]
arg [-L/lib/../lib64] ==> dir [/lib/../lib64]
arg [-L/usr/lib/../lib64] ==> dir [/usr/lib/../lib64]
arg [-L/usr/lib/gcc/x86_64-redhat-linux/9/../../..] ==> dir [/usr/lib/gcc/x86_64-redhat-linux/9/../../..]
arg [CMakeFiles/cmTC_8e81c.dir/CMakeCCompilerABI.c.o] ==> ignore
arg [-lgcc] ==> lib [gcc]
arg [--push-state] ==> ignore
arg [--as-needed] ==> ignore
arg [-lgcc_s] ==> lib [gcc_s]
arg [--pop-state] ==> ignore
arg [-lc] ==> lib [c]
arg [-lgcc] ==> lib [gcc]
arg [--push-state] ==> ignore
arg [--as-needed] ==> ignore
arg [-lgcc_s] ==> lib [gcc_s]
arg [--pop-state] ==> ignore
arg [/usr/lib/gcc/x86_64-redhat-linux/9/crtend.o] ==> ignore
arg [/usr/lib/gcc/x86_64-redhat-linux/9/../../../../lib64/crtn.o] ==> ignore
collapse library dir [/usr/lib/gcc/x86_64-redhat-linux/9] ==> [/usr/lib/gcc/x86_64-redhat-linux/9]
collapse library dir [/usr/lib/gcc/x86_64-redhat-linux/9/../../../../lib64] ==> [/usr/lib64]
collapse library dir [/lib/../lib64] ==> [/lib64]
collapse library dir [/usr/lib/../lib64] ==> [/usr/lib64]
collapse library dir [/usr/lib/gcc/x86_64-redhat-linux/9/../../..] ==> [/usr/lib]
implicit libs: [gcc;gcc_s;c;gcc;gcc_s]
implicit dirs: [/usr/lib/gcc/x86_64-redhat-linux/9;/usr/lib64;/lib64;/usr/lib]
implicit fwks: []
Your CMakeLists.txt should have something that looks like this, following the FindBLAS suggestion:
include(FindBLAS)
if (BLAS_FOUND)
target_compile_options(${PROJECT_NAME} PRIVATE ${BLAS_LINKER_FLAGS})
target_link_libraries(${PROJECT_NAME} ${BLAS_LIBRARIES})
endif ()