testdriver: delete unused ways

And mention more prominently that `-DDEBUG` and tests that call
`compiler_stats_num_fields` don't play well together

Reviewed By: austin

Differential Revision: https://phabricator.haskell.org/D799

testsuite/config/ghc

@@ -14,9 +14,11 @@ config.hpc                   = 'hpc'
 config.gs                    = 'gs'
 config.confdir               = '.'
 
-# By default, we test the 'normal', 'opt' and 'hpc' ways.
-# 'optasm' is added by mk/test.mk if the compiler has a native code gen,
-# 'prof'   is added by mk/test.mk if the profiling way is enabled.
+# By default, the 'normal' and 'hpc' ways are enabled. In addition, certain
+# ways are enabled automatically if this GHC supports them. Ways that fall in
+# this group are 'optasm', 'optllvm', 'profasm', 'threaded1', 'threaded2',
+# 'profthreaded', 'ghci', and whichever of 'static/dyn' is not this GHC's
+# default mode. Other ways should be set explicitly from .T files.
 config.compile_ways       = ['normal', 'hpc']
 config.run_ways           = ['normal', 'hpc']
 
@@ -27,8 +29,6 @@ config.other_ways         = ['prof',
                              'threaded1_ls', 'threaded2_hT',
                              'llvm', 'debugllvm',
                              'profllvm', 'profoptllvm', 'profthreadedllvm',
-                             'threaded1llvm', 'threaded2llvm',
-                             'dynllvm',
                              'debug']
 
 if (ghc_with_native_codegen == 1):
@@ -110,9 +110,6 @@ config.way_flags = lambda name : {
     'profllvm'         : ['-prof', '-static', '-auto-all', '-fllvm'],
     'profoptllvm'      : ['-O', '-prof', '-static', '-auto-all', '-fllvm'],
     'profthreadedllvm' : ['-O', '-prof', '-static', '-auto-all', '-threaded', '-fllvm'],
-    'threaded1llvm'    : ['-threaded', '-debug', '-fllvm'],
-    'threaded2llvm'    : ['-O', '-threaded', '-eventlog', '-fllvm'],
-    'dynllvm'          : ['-O', '-dynamic', '-fllvm']
    }
 
 config.way_rts_flags = { 
@@ -143,9 +140,6 @@ config.way_rts_flags = {
     'profllvm'         : ['-p'],
     'profoptllvm'      : ['-hc', '-p'],
     'profthreadedllvm' : ['-p'],
-    'threaded1llvm'    : [],
-    'threaded2llvm'    : ['-N2 -ls'],
-    'dynllvm'          : []
    }
 
 # Useful classes of ways that can be used with only_ways() and

testsuite/tests/perf/compiler/all.T

+# Tests that call 'compiler_stats_num_field' are skipped when debugging is on.
+# See testsuite/driver/testlib.py.
+
 def no_lint(name, opts):
    opts.compiler_always_flags = \
        [opt for opt in opts.compiler_always_flags if opt != '-dcore-lint' and opt != '-dcmm-lint']

validate

@@ -20,7 +20,8 @@ Flags:
                     HTML generated here: testsuite/hpc_output/hpc_index.html
   --normal          Default settings
   --fast            Omit dyn way, omit binary distribution
-  --slow            Build stage2 with -DDEBUG.
+  --slow            Build stage2 with -DDEBUG. Skips tests that call
+                    `compiler_stats_num_field`.
                     2008-07-01: 14% slower than the default.
   --dph:            Also build libraries/dph and run associated tests.
   --help            shows this usage help.