Hi, I have different libraries that implements te same interface (the netcdf interface) and each one comes with a netcdf.h file in a specific directory. I would like to check headers against each of these libraries in turn. So I set CPPFLAGS to each of the include directories in turn. However configure doesn't retry the test when CPPFLAGS changes and instead uses the cached value from previous test. Here is a simplified example of the tests: CPPFLAGS_save="$CPPFLAGS" CPPFLAGS="$CPPFLAGS -I/usr/include/hdf2" AC_CHECK_HEADERS([netcdf.h],[echo "found with hdf"]) CPPFLAGS="$CPPFLAGS_save" CPPFLAGS_save="$CPPFLAGS" CPPFLAGS="$CPPFLAGS -I/usr/include/libnc-dap/" AC_CHECK_HEADERS([netcdf.h],[echo "found with libnc-dap"]) CPPFLAGS="$CPPFLAGS_save" If the first test fails, the second also fails, even if netcdf.h is in /usr/include/libnc-dap/. The output is in that case checking for netcdf.h... no checking for netcdf.h... (cached) no If I comment out the first test, the second test succeed. So it seems that there is a kind of caching that cannot be disabled and that is preventing such tests to work. I have read a bit of documentation but haven't found how to disable that caching. Indeed what I read in (autoconf) Cache Files is: " By default, `configure' uses no cache file (technically, it uses `--cache-file=/dev/null'), to avoid problems caused by accidental use of stale cache files." Any thought on that question? With autoconf 2.59. -- Pat _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
