[Starpu-devel] Reliance on Debian-specific .pc file for OpenBLAS

[ludovic.courtes@inria.fr (Ludovic Courtès)]

Hello,

Adrien Guilbaud and myself realized that StarPU’s configure script
relies on Debian-specific pkg-config files in this snippet:

    PKG_CHECK_MODULES([OPENBLAS],  [openblas],  [
      PKG_CHECK_MODULES([BLAS_OPENBLAS],  [blas-openblas],  [
        AC_DEFINE([STARPU_OPENBLAS], [1], [Define to 1 if you use the 
openblas library.])
        AC_SUBST([STARPU_OPENBLAS], [1])
        CFLAGS="${CFLAGS} ${OPENBLAS_CFLAGS} ${BLAS_OPENBLAS_CFLAGS} "
        LIBS="${LIBS} ${OPENBLAS_LIBS} ${BLAS_OPENBLAS_LIBS} "
        blas_lib=openblas
      ], [
        if test x$blas_lib = xopenblas; then
          AC_MSG_ERROR([cannot find blas-openblas lib])
        fi
      ])
    ], [
      if test x$blas_lib = xopenblas; then
        AC_MSG_ERROR([cannot find openblas lib])
      fi
    ])

Here ‘blas-openblas.pc’ exists in the Debian ‘libopenblas-dev’ package
but it does not exist upstream (see the Debian source package at
<https://packages.debian.org/stretch/libopenblas-dev>.)

What about using ‘AC_CHECK_LIB’ or similar when looking for libblas, at
least as a last resort?

Thanks,
Ludo’.