make -j4 seems unsafe for gcc-2.95.3

[Daniel Kegel <dank at kegel dot com>]

I've always suspected that not all the bugs were worked out of
the make -j support for older gcc's, and now I have a bit of evidence, maybe:
the gcc makefile seems to use cc1plus right before it's created,
or while it's being written, or something, when building with -j4 on
a dual processor machine (with hyperthreading, which I guess is why my
little script picked -j4, it got fooled).  Guess I'll try a lower
value of -j.  Here's a (confused) log snippet:

/foo/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/build-gcc/gcc/xgcc \
-B/foo/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/build-gcc/gcc/ \
-B/home/dkegel/crosstooltest/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/i686-unknown-linux-gnu/bin/ \
-I/home/dkegel/crosstooltest/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/i686-unknown-linux-gnu/include \
-O2  -DCROSS_COMPILE -DIN_GCC     -g -O2 -I./include  -fPIC -g1 \
-DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED   -g -O2 \
-I. -I/foo/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/gcc-2.95.3/gcc \
-I/foo/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/gcc-2.95.3/gcc/config\
 -I/foo/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/gcc-2.95.3/gcc/../include \
  -c /foo/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/gcc-2.95.3/gcc/cp/tinfo.cc
^^^ tries to compile a C++ file

gcc -DCROSS_COMPILE -DIN_GCC    -g -O2   -o ../cc1plus `cat ../stamp-objlist` ../c-common.o ../c-pragma.o \
call.o decl.o errfn.o expr.o pt.o sig.o typeck2.o class.o decl2.o error.o lex.o parse.o ptree.o \
rtti.o spew.o typeck.o cvt.o except.o friend.o init.o method.o search.o semantics.o tree.o xref.o \
repo.o

^^^ creates cc1plus

`if [ xobstack.o != x ]; then echo ../obstack.o; else true; fi` `case "gcc" in "cc") if [ x != x ]; then echo ../; else true; fi ;; esac` `if [ x != x ]; then echo ../; else true; fi`
make[2]: Leaving directory `/bar/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/build-gcc/gcc'
make[2]: Entering directory `/bar/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/build-gcc/gcc'

/foo/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/build-gcc/gcc/xgcc \
-B/foo/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/build-gcc/gcc/ \
-B/home/dkegel/crosstooltest/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/i686-unknown-linux-gnu/bin/ \
-I/home/dkegel/crosstooltest/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/i686-unknown-linux-gnu/include \
-O2  -DCROSS_COMPILE -DIN_GCC     -g -O2 -I./include  -fPIC -g1 \
-DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED   -g -O2 \
-I. -I/foo/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/gcc-2.95.3/gcc \
-I/foo/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/gcc-2.95.3/gcc/config \
-I/foo/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/gcc-2.95.3/gcc/../include \
  -c /foo/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/gcc-2.95.3/gcc/cp/tinfo2.cc

^^^ tries to compile another C++ file

xgcc: installation problem, cannot exec `cc1plus': No such file or directory
make[2]: *** [tinfo2.o] Error 1
make[2]: Leaving directory `/bar/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/build-gcc/gcc'
make[1]: *** [libgcc2.a] Error 1
make[1]: *** Waiting for unfinished jobs....
make[2]: Leaving directory `/bar/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/build-gcc/gcc/cp'
make[1]: Leaving directory `/bar/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.5/build-gcc/gcc'
make: *** [all-gcc] Error 2

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