Backgroud: the project checks is Fortran is modern enough, and proceeds to configure Fortran interface on success, while skipping it on failure. It appears that the following seemingly natural chaining does not work:
AC_FC_FREEFORM([AC_FC_FUNC([dgeqrf])], [AC_MSG_NOTICE([oops...ok])]) Namely, on failure of AC_FREE_FORM, still AC_FC_FUNC starts executing and errors out (e.g. if there is no Fortran compiler found). Here is a small configure.ac example to show this: AC_PREREQ([2.69]) AC_INIT([foo],[1]) AC_CONFIG_MACRO_DIR([m4]) AC_PROG_CC() AC_PROG_FC() AC_FC_FREEFORM([AC_FC_FUNC([dgeqrf])], [AC_MSG_NOTICE([oops...oops])]) AC_OUTPUT() Is this a bug? Are there any workarounds for this? Thanks Dmitrii PS. here is the output of ./configure generated from the above, if there is no Fortran available $ ./configure checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking whether gcc understands -c and -o together... yes checking for gfortran... no checking for g95... no checking for xlf95... no checking for f95... no checking for fort... no checking for ifort... no checking for ifc... no checking for efc... no checking for pgfortran... no checking for pgf95... no checking for lf95... no checking for ftn... no checking for nagfor... no checking for xlf90... no checking for f90... no checking for pgf90... no checking for pghpf... no checking for epcf90... no checking for g77... no checking for xlf... no checking for f77... no checking for frt... no checking for pgf77... no checking for cf77... no checking for fort77... no checking for fl32... no checking for af77... no checking whether we are using the GNU Fortran compiler... no checking whether accepts -g... no checking build system type... x86_64-pc-linux-gnu checking host system type... x86_64-pc-linux-gnu checking how to get verbose linking output from ... configure: WARNING: compilation failed checking for Fortran libraries of ... checking for dummy main to link with Fortran libraries... none checking for Fortran name-mangling scheme... configure: error: in `/home/dimpase/tmp/fc': configure: error: cannot compile a simple Fortran program See `config.log' for more details
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