about add gcc/cpp version check to avoid -MD option.

Hello all,

The distcc now not support gcc -MD without -MF very well, because distcc
will strip -o out, so the cpp will put the dependency file to the current
directory, but the makefile may put the object file and dependency file to
another directory.

the comments in cpp.c:

   /* We strip the -o option and allow cpp to write to stdout, which is
     * caught in a file.  Sun cc doesn't understand -E -o, and gcc screws up
     * -MD -E -o.
     *
     * There is still a problem here with -MD -E -o, gcc writes dependencies
     * to a file determined by the source filename.  We could fix it by
     * generating a -MF option, but that would break compilation with older
     * versions of gcc.  This is only a problem for people who have the source
     * and objects in different directories, and who don't specify -MF.  They
     * can fix it by specifying -MF.  */

The comments said that some older versions of gcc will broken by
generating a -MF option,So I'm thinking can we add a version record of
gcc, and allow us to add a -MF to some version of gcc, so we may find
out the oldest cann't broken by this behavior.

what's you opinion?


Best regards,
Zhang Jiejing

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