Method find_executables

numpy/distutils/fcompiler/__init__.py:285–362

Go through the self.executables dictionary, and attempt to find and assign appropriate executables. Executable names are looked for in the environment (environment variables, the distutils.cfg, and command line), the 0th-element of the command list, and the self.poss

(self)

    ## results if used elsewhere. So, you have been warned..

    def find_executables(self):
        """Go through the self.executables dictionary, and attempt to
        find and assign appropriate executables.

        Executable names are looked for in the environment (environment
        variables, the distutils.cfg, and command line), the 0th-element of
        the command list, and the self.possible_executables list.

        Also, if the 0th element is "<F77>" or "<F90>", the Fortran 77
        or the Fortran 90 compiler executable is used, unless overridden
        by an environment setting.

        Subclasses should call this if overridden.
        """
        assert self._is_customised
        exe_cache = self._exe_cache
        def cached_find_executable(exe):
            if exe in exe_cache:
                return exe_cache[exe]
            fc_exe = find_executable(exe)
            exe_cache[exe] = exe_cache[fc_exe] = fc_exe
            return fc_exe
        def verify_command_form(name, value):
            if value is not None and not is_sequence_of_strings(value):
                raise ValueError(
                    "%s value %r is invalid in class %s" %
                    (name, value, self.__class__.__name__))
        def set_exe(exe_key, f77=None, f90=None):
            cmd = self.executables.get(exe_key, None)
            if not cmd:
                return None
            # Note that we get cmd[0] here if the environment doesn't
            # have anything set
            exe_from_environ = getattr(self.command_vars, exe_key)
            if not exe_from_environ:
                possibles = [f90, f77] + self.possible_executables
            else:
                possibles = [exe_from_environ] + self.possible_executables

            seen = set()
            unique_possibles = []
            for e in possibles:
                if e == '<F77>':
                    e = f77
                elif e == '<F90>':
                    e = f90
                if not e or e in seen:
                    continue
                seen.add(e)
                unique_possibles.append(e)

            for exe in unique_possibles:
                fc_exe = cached_find_executable(exe)
                if fc_exe:
                    cmd[0] = fc_exe
                    return fc_exe
            self.set_command(exe_key, None)
            return None