PR 40958 Compress module files with zlib.

PR 40958 Compress module files with zlib.

frontend ChangeLog:

2013-04-17  Janne Blomqvist  <jb@gcc.gnu.org>

	PR fortran/40958
	* scanner.h: New file.
	* Make-lang.in: Dependencies on scanner.h.
	* scanner.c (gfc_directorylist): Move to scanner.h.
	* module.c: Don't include md5.h, include scanner.h and zlib.h.
	(MOD_VERSION): Add comment about backwards compatibility.
	(module_fp): Change type to gzFile.
	(ctx): Remove.
	(gzopen_included_file_1): New function.
	(gzopen_included_file): New function.
	(gzopen_intrinsic_module): New function.
	(write_char): Use gzputc.
	(read_crc32_from_module_file): New function.
	(read_md5_from_module_file): Remove.
	(gfc_dump_module): Use gz* functions instead of stdio, check gzip
	crc32 instead of md5.
	(read_module_to_tmpbuf): Use gz* functions instead of stdio.
	(gfc_use_module): Use gz* functions.

testsuite ChangeLog:

2013-04-17  Janne Blomqvist  <jb@gcc.gnu.org>

        PR fortran/40958
        * lib/gcc-dg.exp (scan-module): Uncompress module file before
        scanning.
        * gfortran.dg/module_md5_1.f90: Remove.

From-SVN: r198023