MERCURY_OPTIONS=
gmake[3]: Entering directory '/home/mercury/testing/run/build/mercury-srcdist-rotd-2025-06-26/tests/warnings'
{ echo MCFLAGS += '--grade java    --options-file /home/mercury/testing/run/build/mercury-srcdist-rotd-2025-06-26/stage2/Mercury.options --mercury-linkage static -j2 --flags ../TESTS_FLAGS --flags ../WS_FLAGS --output-compile-error-lines 0 --color-diagnostics --infer-all --use-subdirs    '; echo MCFLAGS += ' '; echo CFLAGS += '    '; echo JAVACFLAGS += '-J"-Xmx1024m"   '; echo CSCFLAGS += '   '; echo C2INITARGS += '/home/mercury/testing/run/build/mercury-srcdist-rotd-2025-06-26/stage2/library/mer_std.init /home/mercury/testing/run/build/mercury-srcdist-rotd-2025-06-26/stage2/runtime/mer_rt.init    '; echo MLLIBS += '   '; echo MLOBJS += '  '; echo LDFLAGS += '  '; echo LD_LIBFLAGS += '  '; echo EXTRA_LIBRARIES += ''; echo EXTRA_LIB_DIRS += ''; echo LIBGRADES = 'hlc.gc  '; echo INSTALL_PREFIX = '/home/mercury/testing/run/install'; echo LINKAGE = 'shared'; echo MERCURY_LINKAGE = 'shared'; } | /home/mercury/testing/run/build/mercury-srcdist-rotd-2025-06-26/stage2/scripts/mmc --make --options-file - help_opt_levels.depend
gmake[3]: Leaving directory '/home/mercury/testing/run/build/mercury-srcdist-rotd-2025-06-26/tests/warnings'
gmake[3]: Entering directory '/home/mercury/testing/run/build/mercury-srcdist-rotd-2025-06-26/tests/warnings'
/home/mercury/testing/run/build/mercury-srcdist-rotd-2025-06-26/stage2/scripts/mmc --options-file /home/mercury/testing/run/build/mercury-srcdist-rotd-2025-06-26/stage2/Mercury.options --mercury-linkage static -j2 --flags ../TESTS_FLAGS --flags ../WS_FLAGS --output-compile-error-lines 0 --color-diagnostics --infer-all --use-subdirs --output-optimization-options-upto 8 \
	help_opt_levels.m > help_opt_levels.err 2>&1
diff -u help_opt_levels.err_exp help_opt_levels.err \
	> help_opt_levels.res || \
	{ cat help_opt_levels.res; exit 1; }
--- help_opt_levels.err_exp	2025-06-22 21:41:47.000000000 +1000
+++ help_opt_levels.err	2025-06-27 07:23:33.274727249 +1000
@@ -107,7 +107,7 @@
 
 Optimization level 6:
 
-    apply optimizations which may have any payoff even if they
+    Apply optimizations which may have any payoff even if they
     increase compilation time to completely unreasonable levels.
     
     Currently this just enables inlining of GC_malloc(), redo(), and fail().
gmake[3]: *** [/tmp/mmake.oTyx4q:911: help_opt_levels.runtest] Error 1
gmake[3]: Leaving directory '/home/mercury/testing/run/build/mercury-srcdist-rotd-2025-06-26/tests/warnings'
ERROR OUTPUT
Optimization level 0:

    Aim to minimize overall compilation time.

    The options set at this level are:

        --common-data
        --excess-assign
        --llds-optimize
        --mlds-optimize
        --mlds-peephole
        --optimize-dead-procs
        --optimize-jumps
        --optimize-labels
        --optimize-peep
        --optimize-peep-mkword
        --optimize-repeat=1
        --smart-indexing
        --static-ground-terms

Optimization level 1:

    Apply optimizations which are cheap and have a good payoff
    while still keeping compilation time small.

    The options set at this level are:

        --c-optimize
        --emit-c-loops
        --middle-rec
        --optimize-delay-slot
        --optimize-frames
        --optimize-tailcalls
        --use-local-vars

Optimization level 2:

    Apply optimizations which have a good payoff relative to their cost;
    but include optimizations which are more costly than with -O1.

    The options set at this level are:

        --common-struct
        --follow-code
        --inline-compound-threshold=10
        --inline-simple
        --inline-single-use
        --merge-code-after-switch
        --optimize-constant-propagation
        --optimize-dups
        --optimize-fulljumps
        --optimize-initializations
        --optimize-repeat=3
        --simple-neg
        --split-switch-arms
        --user-guided-type-specialization

Optimization level 3:

    Apply optimizations which usually have a good payoff even if they
    increase compilation time quite a bit.

    The options set at this level are:

        --constraint-propagation
        --deforestation
        --excess-assign
        --optimize-higher-order
        --optimize-reassign
        --optimize-repeat=4
        --optimize-saved-vars-const
        --optimize-unused-args

Optimization level 4:

    Apply optimizations which may have some payoff even if they
    increase compilation time quite a bit.
    
    Currently this enables the use of local variables
    and increases the inlining thresholds.

    The options set at this level are:

        --higher-order-size-limit=30
        --inline-compound-threshold=20
        --inline-simple-threshold=8

Optimization level 5:

    Apply optimizations which may have some payoff even if they
    increase compilation time a lot.
    
    Currently this enables the search for construction unifications that
    can be delayed past failing computations, allows more passes of the
    low-level optimizations, and increases the inlining thresholds
    still further. We also enable eliminate_local_vars only at
    this level, because that pass is implemented pretty inefficiently.

    The options set at this level are:

        --delay-constructs
        --eliminate-local-vars
        --higher-order-size-limit=40
        --inline-compound-threshold=100
        --loop-invariants
        --optimize-repeat=5

Optimization level 6:

    Apply optimizations which may have any payoff even if they
    increase compilation time to completely unreasonable levels.
    
    Currently this just enables inlining of GC_malloc(), redo(), and fail().

    The options set at this level are:

        --inline-alloc
        --use-macro-for-redo-fail
END OF THE ERROR OUTPUT