Tweak path and concurrency for macOS builds.

.travis.yml

@@ -25,6 +25,7 @@ env:
         # Don't get warnings about Python 2 support being deprecated. We
         # know. The env var works for pip 20.
         - PIP_NO_PYTHON_VERSION_WARNING=1
+        - PIP_NO_WARN_SCRIPT_LOCATION=1
         - CC="ccache gcc"
         - CCACHE_NOCPP2=true
         - CCACHE_SLOPPINESS=file_macro,time_macros,include_file_ctime,include_file_mtime
@@ -33,7 +34,7 @@ env:
         - GEVENTSETUP_EV_VERIFY=2
         # Disable some warnings produced by libev especially and also some Cython generated code.
         # Note that changing the value of these variables invalidates configure caches
-        - CFLAGS="-g -pipe -Wno-strict-aliasing -Wno-comment"
+        - CFLAGS="-Ofast -pipe -Wno-strict-aliasing -Wno-comment"
         - CPPFLAGS="-I$BUILD_LIBS/include -DEV_VERIFY=3"
         - LDFLAGS="-L$BUILD_LIBS/lib"
         - LD_LIBRARY_PATH="$BUILD_LIBS/lib"
@@ -93,6 +94,8 @@ before_install:
   - |
     if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
       brew install ccache
+      export PATH="/usr/local/opt/ccache/libexec:$PATH"
+      export CFLAGS="$CFLAGS -Wno-parentheses-equality"
     fi
 
 before_script:

src/gevent/testing/testrunner.py

@@ -19,6 +19,7 @@ from .sysinfo import PYPY
 from .sysinfo import PY2
 from .sysinfo import RESOLVER_ARES
 from .sysinfo import RUN_LEAKCHECKS
+from .sysinfo import OSX
 from . import six
 from . import travis
 
@@ -50,7 +51,7 @@ DEFAULT_RUN_OPTIONS = {
 
 if RUNNING_ON_CI:
     # Too many and we get spurious timeouts
-    DEFAULT_NWORKERS = 4
+    DEFAULT_NWORKERS = 4 if not OSX else 2
 
 
 def _package_relative_filename(filename, package):