Fix macOS build for Python 3.7

- Specify --with-openssl directory for Python build
- Better checks for downloaded SDK, OpenSSL, and Python
- Fix missing slash for Python build CPPFLAGS

Signed-off-by: Christopher Crone <christopher.crone@docker.com>

script/setup/osx

@@ -50,7 +50,7 @@ mkdir -p ${TOOLCHAIN_PATH}
 #
 # Set macOS SDK.
 #
-if [ ${SDK_FETCH} ]; then
+if [[ ${SDK_FETCH} && ! -f ${TOOLCHAIN_PATH}/MacOSX${DEPLOYMENT_TARGET}.sdk/SDKSettings.plist ]]; then
   SDK_PATH=${TOOLCHAIN_PATH}/MacOSX${DEPLOYMENT_TARGET}.sdk
   fetch_tarball ${SDK_URL} ${SDK_PATH} ${SDK_SHA1}
 else
@@ -61,7 +61,7 @@ fi
 # Build OpenSSL.
 #
 OPENSSL_SRC_PATH=${TOOLCHAIN_PATH}/openssl-${OPENSSL_VERSION}
-if ! [ -f ${TOOLCHAIN_PATH}/bin/openssl ]; then
+if ! [[ $(${TOOLCHAIN_PATH}/bin/openssl version) == *"${OPENSSL_VERSION}"* ]]; then
   rm -rf ${OPENSSL_SRC_PATH}
   fetch_tarball ${OPENSSL_URL} ${OPENSSL_SRC_PATH} ${OPENSSL_SHA1}
   (
@@ -77,7 +77,7 @@ fi
 # Build Python.
 #
 PYTHON_SRC_PATH=${TOOLCHAIN_PATH}/Python-${PYTHON_VERSION}
-if ! [ -f ${TOOLCHAIN_PATH}/bin/python3 ]; then
+if ! [[ $(${TOOLCHAIN_PATH}/bin/python3 --version) == *"${PYTHON_VERSION}"* ]]; then
   rm -rf ${PYTHON_SRC_PATH}
   fetch_tarball ${PYTHON_URL} ${PYTHON_SRC_PATH} ${PYTHON_SHA1}
   (
@@ -87,9 +87,10 @@ if ! [ -f ${TOOLCHAIN_PATH}/bin/python3 ]; then
       --datarootdir=${TOOLCHAIN_PATH}/share \
       --datadir=${TOOLCHAIN_PATH}/share \
       --enable-framework=${TOOLCHAIN_PATH}/Frameworks \
+      --with-openssl=${TOOLCHAIN_PATH} \
       MACOSX_DEPLOYMENT_TARGET=${DEPLOYMENT_TARGET} \
       CFLAGS="-isysroot ${SDK_PATH} -I${TOOLCHAIN_PATH}/include" \
-      CPPFLAGS="-I${SDK_PATH}/usr/include -I${TOOLCHAIN_PATH}include" \
+      CPPFLAGS="-I${SDK_PATH}/usr/include -I${TOOLCHAIN_PATH}/include" \
       LDFLAGS="-isysroot ${SDK_PATH} -L ${TOOLCHAIN_PATH}/lib"
     make -j 4
     make install PYTHONAPPSDIR=${TOOLCHAIN_PATH}