Missing libm linkage when building with cmake

[antonio-rojas]

I'm building openblas with

  cmake -B build64 -S OpenBLAS \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DBUILD_SHARED_LIBS=ON \
    -DBUILD_WITHOUT_LAPACK=ON \
    -DBUILD_WITHOUT_CBLAS=ON \
    -DBUILD_TESTING=OFF \
    -DNO_AFFINITY=ON \
    -DUSE_OPENMP=1 \
    -DCORE=CORE2 \
    -DDYNAMIC_ARCH=ON \
    -DINTERFACE64=1

and the resulting libopenblas64.so library is not linked to libm.so, even though it calls libm functions, such as sqrt.
Building without -DINTERFACE64=1 produces a library which is correctly linked to libm.so

[martin-frbg]

What is your operating system please ? I cannot seem to reproduce this on Linux.

[antonio-rojas]

Arch Linux x86_64

[martin-frbg]

Interesting. Are you building the 0.3.21 release, or current github develop branch ?

[antonio-rojas]

Tried both, same result

[martin-frbg]

Hmm, what compiler (and version) ?

[antonio-rojas]

gcc 12.2.1

[martin-frbg]

Got it now - appears to be independent from the INTERFACE64 setting. The changed CMakeLists.txt from #3895 should address it (and I am currently doubting if the EXTRALIB that gets so painstakingly set as in the gmake build is actually used anywhere in the cmake build at all...)

[antonio-rojas]

Got it now - appears to be independent from the INTERFACE64 setting.

Right, sorry for the confusion - I was actually testing an older build made with the plain Makefile