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<bld>/gcc/testsuite disappears when recompiling


I've asked about this recently, but I still cannot do what I used to do
before the toplevel bootstrap changes.

The scenario is this: I just finished bootstrapping the compiler and
found that there are new C++ and Fortran failures in the testsuite.  So,
I go into <bld> and want to rebuild f951 and cc1plus with the host
compiler and '-g -O0'.

I tried 'make all-stage1 STAGE1_LANGUAGES=c++,fortran'.  Not only that
didn't work, it wiped the directory <bld>/gcc/testsuite.

Is it possible to make <bld>/gcc/testsuite more resilient to things like
this?  I only want to make it disappear if I do 'make clean'.


Thanks.


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