Cannot use some openBLAS routines on my m1 Mac ( example : cgeqp3rk(...)) #5192
Description
I am encountering a linking error when trying to compile a Fortran project that uses OpenBLAS on my M1 MacBook Pro. The error message indicates that the symbol cgepq3rk cannot be found, which I believe is related to OpenBLAS or LAPACK functions.
Steps to Reproduce:
Install OpenBLAS using Homebrew:
brew install openblas
Set up a basic Fortran program that uses OpenBLAS (or any program that links OpenBLAS).
Attempt to compile the program using gfortran with OpenMP and OpenBLAS flags:
gfortran -fopenmp -I/opt/homebrew/opt/openblas/include -L/opt/homebrew/opt/openblas/lib -lopenblas -g -O0 main.f90 -o fmain
Expected Behavior:
The program should compile and link successfully without errors.
Actual Behavior:
The linker returns the following error:
Undefined symbols for architecture arm64:
"_cgepq3rk_", referenced from:
___blockcompress_MOD_compresstruncated in cciveV9U.o
ld: symbol(s) not found for architecture arm64
collect2: error: ld returned 1 exit status
make: *** [f90] Error 1
Additional Information:
I am using macOS on an Apple M1 (ARM64) architecture.
OpenBLAS is installed via Homebrew and is in the /opt/homebrew/opt/openblas directory.
The error suggests that the required OpenBLAS symbol cgepq3rk is missing, which may indicate a mismatch between the OpenBLAS library and the code being compiled.
OpenBLAS is keg-only on my system, and I have set the environment variables as per the Homebrew output:
export LDFLAGS="-L/opt/homebrew/opt/openblas/lib"
export CPPFLAGS="-I/opt/homebrew/opt/openblas/include"
export PKG_CONFIG_PATH="/opt/homebrew/opt/openblas/lib/pkgconfig"
System Details:
macOS Version: [e.g., macOS 13.2.1]
Homebrew Version: [e.g., 3.5.0]
gfortran Version: [e.g., 12.2]
OpenBLAS Version: 0.3.29
Architecture: ARM64 (Apple M1)
Troubleshooting Steps Taken:
Checked OpenBLAS Installation: OpenBLAS is installed in /opt/homebrew/opt/openblas.
Environment Variables: I have set LDFLAGS, CPPFLAGS, and PKG_CONFIG_PATH to point to OpenBLAS.
Checked OpenBLAS Symbol: I verified that the symbol cgepq3rk is not present in my OpenBLAS library using the following command:
nm /opt/homebrew/opt/openblas/lib/libopenblas.dylib | grep cgepq3rk_
Reinstalled OpenBLAS: I tried reinstalling OpenBLAS via Homebrew, but the error persists.
Request:
Please assist with diagnosing the root cause of this linking error and suggest any potential solutions or fixes.
Thank you!