* collect2.c (find_a_file): Use HAVE_DOS_BASED_FILE_SYSTEM in place
of the DIR_SEPARATOR test.
Consider any file starting with a drivename to be absolute.
If the absolute filename test fails and EXECUTABLE_SUFFIX is
defined, append EXECUTABLE_SUFFIX to the file and try again.
* cppinit.c (base_name): Use HAVE_DOS_BASED_FILE_SYSTEM
in place of __MSDOS__ and _WIN32.
* cppfiles.c (simplify_pathname): Likewise.
* gcc.c (IS_DIR_SEPARATOR): Define new macro. Returns true if a
character is a directory separator.
(find_a_file): Use it.
(convert_filename): Likewise.
(process_command): Likewise.
(do_spec_1): Likewise.
(is_directory): Likewise.
(main): Likewise.
* prefix.c (IS_DIR_SEPARATOR): Define. Tests whether a character is
a directory separator.
(translate_name): Use it.
(update_path): Change DIR_SEPARATOR_2 to DIR_SEPARATOR. Fix
warning in block where '/' is changed to DIR_SEPARATOR.
* i386/xm-djgpp.h (DIR_SEPARATOR): Set to '/'.
(DIR_SEPARATOR_2): New macro. Set to '\'.
(HAVE_DOS_BASED_FILESYS): Define.
* i386/xm-mingw32.h: Updated copyright. Set
DIR_SEPARATOR_2 to '/'. Define HAVE_DOS_BASED_FILE_SYSTEM.
* i386/xm-os2.h: Likewise.
* winnt/xm-winnt.h: Likewise.
* i386/xm-dos.h: Likewise. Add copyright.
From-SVN: r26328
509781a4d1