travis: make verbosity (set -x, make -s) configurable

.travis.yml

@@ -64,6 +64,8 @@ matrix:
   - env: SET=test01
     compiler: clang
 
+  - env: VV="" SET=test01
+
 #  - env: SET=test01 EXTRA="CMD_CXXFLAGS=-std=c++11"
 
 #  - env: SET=test01 EXTRA="CMD_CXXFLAGS=-std=c++11"

travis-test.sh

@@ -5,7 +5,8 @@
 # SET=test00 in .travis.yml runs the tests in this script
 # all other jobs are started as compile jobs
 
-set -x
+# Set VV empty in .travis.yml to make scripts terse
+[ "${VV:-1}" ] && set -x
 
 [ "$SET" != "test00" ] && exec ./travis/build.sh
 

travis/.travis.yml.example-full

@@ -44,6 +44,7 @@ script:
 # EXTRA    content will be added to make command line
 # STATIC   set to YES for static build (default: NO)
 # TEST     set to NO to skip running the tests (default: YES)
+# VV       set to make build scripts verbose (default: unset)
 
 matrix:
   include:

travis/build.sh

@@ -1,5 +1,8 @@
 #!/bin/sh
-set -e -x
+set -e
+
+# Set VV in .travis.yml to make scripts verbose
+[ "$VV" ] && set -x
 
 make -j2 $EXTRA
 

travis/prepare.sh

@@ -1,5 +1,8 @@
 #!/bin/sh
-set -e -x
+set -e
+
+# Set VV in .travis.yml to make scripts verbose
+[ "$VV" ] && set -x
 
 # Perl version of "readlink -f" (which MacOS does not provide)
 readlinkf() { perl -MCwd -e 'print Cwd::abs_path shift' "$1"; }
@@ -156,11 +159,13 @@ fold_end set.up.compiler
 
 fold_start build.dependencies "Rebuild missing dependencies"
 
+[ "$VV" ] && silent="-s" || silent=
+
 for module in ${modules_to_compile}
 do
   name=$(basename $module)
   fold_start build.$name "Build $name"
-  make -j2 -C $module $EXTRA
+  make -j2 $silent -C $module $EXTRA
   fold_end build.$name
 done