PATCH to run only test where appropriate

[Jeffrey A Law]

  In message < 13840.60777.577076.232891@slsvhmt >you write:
  > On Tue, 29 September 1998, 15:53:53, manfred@s-direktnet.de wrote:
  > 
  >  > Another thing  which should be  fixed: currently "make  check" ignores
  >  > any  definition of LANGUAGES; on  my Motorola machines I restrict them
  >  > to "c  c++" due to the  slow machines.  Unfortunately, the "check-..."
  >  > targets    don't consider if they    actually  can do anything useful,
  >  > e.g. if "cc1plus" doesn't exist, don't even try to start "runtest"; in
  >  > my example, the check-f77 causes me one  additional *hour* of checking
  >  > on the dog slow m68k box :-( I'll be sending a patch for this, too.
  > 
  > This patch
  > 
  >   - adds code to check if the compiler to be tested even exists,
  >   - eliminates the redundancy of having a separate "check-" target
  >     for each compiler; they actually only differ in the `--tool'
  >     argument.
  > 
  > OK to install?
No.  In the absence of binaries for the compiler in the build directory the
testsuite should use the compilers from the install tree.  Your patch would
disable that behavior as far as I can tell.

jeff