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.