customize concurrent JOBS per compiler/platform

.travis.yml

@@ -5,16 +5,16 @@ matrix:
     - os: linux
   include:
     - os: linux
-      env: BUILDTYPE=Release
+      env: BUILDTYPE=Release JOBS=16
       compiler: clang
     - os: linux
-      env: BUILDTYPE=Debug
+      env: BUILDTYPE=Debug JOBS=8
       compiler: clang
     - os: linux
-      env: BUILDTYPE=Release
+      env: BUILDTYPE=Release JOBS=4
       compiler: gcc
     - os: osx
-      env: BUILDTYPE=Debug
+      env: BUILDTYPE=Debug JOBS=4
       compiler: clang
 
 env:

scripts/travis_before_install.sh

@@ -40,7 +40,7 @@ if [[ ${TRAVIS_OS_NAME} == "linux" ]]; then
     echo $CXXFLAGS
     echo $CFLAGS
     echo $LDFLAGS
-    make -j4 && sudo make install && \
+    make -j$JOBS && sudo make install && \
     cd ../
 
     mapbox_time "install_opengl" \

scripts/travis_script.sh

@@ -8,10 +8,10 @@ if [[ ${TRAVIS_OS_NAME} == "linux" ]]; then
     # build & test Linux
     #
     mapbox_time "compile_program" \
-    make linux -j$(nproc) BUILDTYPE=${BUILDTYPE}
+    make linux -j$JOBS BUILDTYPE=${BUILDTYPE}
 
     mapbox_time "compile_tests" \
-    make test -j$(nproc) BUILDTYPE=${BUILDTYPE}
+    make test -j$JOBS BUILDTYPE=${BUILDTYPE}
 
     mapbox_time "run_tests" \
     ./scripts/run_tests.sh
@@ -34,7 +34,7 @@ elif [[ ${TRAVIS_OS_NAME} == "osx" ]]; then
     make xproj-cli
 
     mapbox_time "build_osx" \
-    xcodebuild -project ./build/macosx/mapboxgl-app.xcodeproj -jobs 4
+    xcodebuild -project ./build/macosx/mapboxgl-app.xcodeproj -jobs $JOBS
 
     #
     # build iOS
@@ -48,5 +48,5 @@ elif [[ ${TRAVIS_OS_NAME} == "osx" ]]; then
     make iproj-cli
 
     mapbox_time "build_ios" \
-    xcodebuild -project ./build/ios/mapbox-gl-cocoa/app/mapboxgl-app.xcodeproj -sdk iphonesimulator ONLY_ACTIVE_ARCH=NO -jobs 4
+    xcodebuild -project ./build/ios/mapbox-gl-cocoa/app/mapboxgl-app.xcodeproj -sdk iphonesimulator ONLY_ACTIVE_ARCH=NO -jobs $JOBS
 fi