patch for make check to deal with -fvtable-thunks

[Jeffrey A Law]

  In message < Pine.OSF.3.96.970912011105.5070A-100000@hepunix1.physics.yale.edu >you write:
  > Problem: If libstdc++ is compiled with -fvtable-thunks, 'make check'
  > 	 will fail for those programs using virtual functions.
Well, for targets that default to -ftable-thunks the compiler
should automatically do the right thing, so there's nothing
to do for that case.

If you choose the non-default way to make the libraries (ie
-fvtable-thunks on a system that doesn't use thunks by default)
then it seems perfectly reasonable to have to specify -ftable-thunks
explicitly when doing the make check.

make -k check RUNTESTFLAGS="CFLAGS_FOR_TARGET=-fvtable-thunks" 

Or something close to that ought to work.


  > ! 	CFLAGS_FOR_TARGET=$(findstring -fvtable-thunks, $(CFLAGS))
For future reference -- you can't use GNU make features like
"findstring" in Makefiles.  It's wrong since the Makefiles have
to work for more than just GNU make.


jeff