File: autoconf.info,  Node: Files,  Next: Libraries,  Prev: Alternative Programs,  Up: Existing Tests

5.3 Files
=========

You might also need to check for the existence of files.  Before using
these macros, ask yourself whether a runtime test might not be a better
solution.  Be aware that, like most Autoconf macros, they test a feature
of the host machine, and therefore, they die when cross-compiling.

 -- Macro: AC_CHECK_FILE (FILE, [ACTION-IF-FOUND],
          [ACTION-IF-NOT-FOUND])
     Check whether file FILE exists on the native system.  If it is
     found, execute ACTION-IF-FOUND, otherwise do ACTION-IF-NOT-FOUND,
     if given.  Cache the result of this test in the ‘ac_cv_file_FILE’
     variable, with characters not suitable for a variable name mapped
     to underscores.

 -- Macro: AC_CHECK_FILES (FILES, [ACTION-IF-FOUND],
          [ACTION-IF-NOT-FOUND])
     For each file listed in FILES, execute ‘AC_CHECK_FILE’ and perform
     either ACTION-IF-FOUND or ACTION-IF-NOT-FOUND.  Like
     ‘AC_CHECK_FILE’, this defines ‘HAVE_FILE’ (*note Standard
     Symbols::) for each file found and caches the results of each test
     in the ‘ac_cv_file_FILE’ variable, with characters not suitable for
     a variable name mapped to underscores.