First stab at making ./validate less verbose

Summary:
When we run `./validate`, we are typically given an incredibly large
heap of information, a large majority of which isn't really
necessary. In particular, we don't really care about what `make` is
doing, nor `ghc` itself most of the time.

This reduces some of the output by making `./validate` quietier. By
running:

  $ ./validate --quiet

you'll enable `V=0` in the build, suppressing compiler messages, and
you will suppress `make` commands by running `make` in 'silent
mode'. It also runs the testsuite with `VERBOSE=2` to avoid extra
lines. This alone makes quite a difference for build log sizes.

Furthermore, by making the build logs less verbose, life is easier for
systems like Harbormaster and Travis-CI, which dislike dealing with
logs that are 10k lines or more.

Signed-off-by: Austin Seipp <austin@well-typed.com>

Test Plan: iiam

Reviewers: hvr, nomeata, ezyang

Reviewed By: ezyang

Subscribers: simonmar, ezyang, carter, thomie

Projects: #ghc

Differential Revision: https://phabricator.haskell.org/D298

validate

@@ -38,6 +38,7 @@ testsuite_only=0
 hpc=NO
 speed=NORMAL
 use_dph=0
+be_quiet=0
 
 while [ $# -gt 0 ]
 do
@@ -66,6 +67,9 @@ do
     --dph)
         use_dph=1
         ;;
+    --quiet)
+        be_quiet=1
+        ;;
     --help)
         show_help
         exit 0;;
@@ -128,9 +132,17 @@ fi
 
 if type gmake > /dev/null 2> /dev/null
 then
-    make="gmake"
+    if [ $be_quiet -eq 1 ]; then
+        make="gmake -s"
+    else
+        make="gmake"
+    fi
 else
-    make="make"
+    if [ $be_quiet -eq 1 ]; then
+        make="make -s"
+    else
+        make="make"
+    fi
 fi
 
 if [ $testsuite_only -eq 0 ]; then
@@ -158,6 +170,11 @@ echo "Validating=YES"       >  mk/are-validating.mk
 echo "ValidateSpeed=$speed" >> mk/are-validating.mk
 echo "ValidateHpc=$hpc"     >> mk/are-validating.mk
 
+if [ $be_quiet -eq 1 ]; then
+    echo "V=0"              >> mk/are-validating.mk # Less gunk
+    echo "GhcHcOpts="       >> mk/are-validating.mk # Remove -Rghc-timing
+fi
+
 if [ $use_dph -eq 1 ]; then
     echo "BUILD_DPH=YES"    >> mk/are-validating.mk
 else
@@ -221,7 +238,12 @@ FAST)
         ;;
 esac
 
-$make $MAKE_TEST_TARGET stage=2 $BINDIST THREADS=$threads 2>&1 | tee testlog
+verbosity=3
+if [ $be_quiet -eq 1 ]; then
+   verbosity=2
+fi
+
+$make $MAKE_TEST_TARGET stage=2 $BINDIST VERBOSE=$verbosity THREADS=$threads 2>&1 | tee testlog
 
 check_packages post-testsuite