Hello, I think I solved one of my problems. Evidently, there's an Autoconf macro AC_LANG. By adding AC_LANG(Fortran) to my configure.ac file, it ensures that test programs are written in Fortran rather than in C, and that seems sufficient to find sgetrf in liblapack. Now, onto the next issue! Which is this: The reference implementation of LAPACK is relatively simple. I just have to link my application using -llapack, and it works. The Intel MKL implementation is in pieces, with dependencies. On a 64-bit platform, I have to link using -lmkl_lapack -lmkl_em64t -lguide -lpthread. First, how do I get the AC_SEARCH_LIBS([sgetrf],[lapack mkl_lapack]) test to work? After all, in order to work, the test program that AC_SEARCH_LIBS writes would have also to link to mkl_em64t, guide, and pthread, otherwise it gets 'undefined reference' to functions in those files, the link step fails, and it concludes that it has not found sgetrf (which is in mkl_lapack). Second, how do I pass all this information onto the generated Makefile? After all, when using the reference lapack, I want only -llapack in the link line. When using Intel MKL, I want -lmkl_lapack -lmkl_em64t -lguide -lpthread. Thanks! Cheers, David On Tue, 2009-03-24 at 15:54 -0700, David A. Ventimiglia wrote: > Hello, > > I have a Fortran program that uses LAPACK. Since LAPACK can come from different vendors depending on the platform, > and be in different locations (e.g., /usr/lib/liblapack.a with the reference implementation, or in mkl_lapack.a in > the Intel compiler tree when using the Intel compiler), I want to use autoconf to make by build process agnostic about this. > How do I accomplish this? > > I thought I'd put this in my configure.ac file: > > AC_SEARCH_LIBS([sgetrf], [lapack mkl_lapack]) > > 'sgetrf' is a subroutine in LAPACK. > > After I run aclocal ; autoconf ; automake ; ./configure, among the output is this: > > checking for library containing sgetrf... no > > And in the config.log file (attached), there's this: > > configure:3968: checking for library containing sgetrf > configure:4009: gcc -o conftest -g -O2 conftest.c >&5 > /tmp/cckOOIRY.o: In function `main': > /home/dventimi/work/cosmosurfo/conftest.c:21: undefined reference to `sgetrf' > collect2: ld returned 1 exit status > configure:4015: $? = 1 > > Evidently, to find a library file that supports the test subprogram 'sgetrf', it tries to compile and link a test > program that calls 'sgetrf', but it comes back with 'undefined reference'. > > Perhaps this is a consequence of using autoconf to search for Fortran libraries (like LAPACK). But either way, how is one > supposed to do this? Thanks! > > Cheers, > David > > _______________________________________________ > Autoconf mailing list > Autoconf@xxxxxxx > http://lists.gnu.org/mailman/listinfo/autoconf _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
