[Gm2] git push on master branch

[Gaius Mulley]

Hi,

I've pushed some changes to the master branch which enable -lpthread to
be used throughout the regression tests.  The error reporting routine
is improved to underline the offending token,

On an amd64 debian stretch system these are the results:

[all PASS entries removed]

FAIL: gm2/errors/fail/array1.mod,  -g
FAIL: gm2/errors/fail/array1.mod,  -O
FAIL: gm2/errors/fail/array1.mod,  -O -g
FAIL: gm2/errors/fail/array1.mod,  -Os
FAIL: gm2/errors/fail/array1.mod,  -O3 -fomit-frame-pointer
FAIL: gm2/errors/fail/array1.mod,  -O3 -fomit-frame-pointer -finline-functions
FAIL: gm2/errors/fail/proctype.mod,  -g
FAIL: gm2/errors/fail/proctype.mod,  -O
FAIL: gm2/errors/fail/proctype.mod,  -O -g
FAIL: gm2/errors/fail/proctype.mod,  -Os
FAIL: gm2/errors/fail/proctype.mod,  -O3 -fomit-frame-pointer
FAIL: gm2/errors/fail/proctype.mod,  -O3 -fomit-frame-pointer -finline-functions
FAIL: gm2/errors/fail/testfio.mod,  -g
FAIL: gm2/errors/fail/testfio.mod,  -O
FAIL: gm2/errors/fail/testfio.mod,  -O -g
FAIL: gm2/errors/fail/testfio.mod,  -Os
FAIL: gm2/errors/fail/testfio.mod,  -O3 -fomit-frame-pointer
FAIL: gm2/errors/fail/testfio.mod,  -O3 -fomit-frame-pointer -finline-functions
FAIL: gm2/errors/fail/testparam.mod,  -g
FAIL: gm2/errors/fail/testparam.mod,  -O
FAIL: gm2/errors/fail/testparam.mod,  -O -g
FAIL: gm2/errors/fail/testparam.mod,  -Os
FAIL: gm2/errors/fail/testparam.mod,  -O3 -fomit-frame-pointer
FAIL: gm2/errors/fail/testparam.mod,  -O3 -fomit-frame-pointer 
-finline-functions
FAIL: gm2/iso/run/pass/constructor2.mod compilation, {additional_flags=-O }


                === gm2 Summary ===

# of expected passes            3760
# of unexpected failures        25
# of unresolved testcases       1


regards,
Gaius