bison autotest option

[tys lefering]

Hi,
using 'make maintainer-check' noticed at failed tests,
lines like this appear in the testuite.log output file:
./regression.at:1037: $CXX $CXXFLAGS $CPPFLAGS $LDFLAGS -o expect2
expect2.cc $LIBS
and the $(CXX) etc. are not expanded into 'g++' etc.
asked the autoconf mailling list about it:
http://lists.gnu.org/archive/html/autoconf/2010-01/msg00068.html
it is possible with bison to run the command:
make maintainer-check TESTSUITEFLAGS="--trace"
and then the output has the $(CC) etc. expanded like this:
++ gcc -std=gnu99 -g
-I/home/twlevo/etc/bisongit/bisontestcompile/bison/lib -o input input.c
/home/twlevo/etc/bisongit/bisontestcompile/bison/lib/libbison.a
more autotest options are available with:
./tests/testsuite --help
maybe the --trace option can be set as default in bison scripts.
thanks.