Cleanup SharedLib Immediately + Bump Minimum MacOS version to 10.15 (#877)

Co-authored-by: Michael Graeb <graebm@amazon.com>

Author: waahm7

README.md

@@ -43,6 +43,7 @@ Building:
 
 ### OSX
 Requirements:
+* MacOS: 10.15+
 * cmake 3.9+
 * ninja
 * Java: Any JDK8 or above, ensure `JAVA_HOME` is set

codebuild/macos_compatibility_check.py

@@ -11,22 +11,9 @@ def main():
         sys.exit(0)
 
     # Default target macos version setup in pom.xml > ${cmake.min_osx_version}
-    supported_version = "10.9"
+    supported_version = "10.15"
     arch = "x86_64"
 
-
-    # otool result has a different format between arm and x64
-    # for arm: we check for "minos"
-    # for x64: The format will be:
-    #
-    # Load command 8
-    # cmd LC_VERSION_MIN_MACOSX
-    #   cmdsize 16
-    #   version 10.9
-    #       sdk 12.1
-    # Load command 9
-    otool_cmd = "otool -l target/cmake-build/lib/osx/{}/cruntime/libaws-crt-jni.dylib | grep -A3 \'LC_VERSION_MIN_MACOSX\' | grep -E version | tr -s ' ' | cut -f3 -d' ' | tr -d '[:space:]'".format(arch)
-
     if len(sys.argv) > 1:
         # Parsing the macos archtecture
         arch = sys.argv[1]
@@ -39,7 +26,26 @@ def main():
         arch = "armv8"
         # The oldest version we can target on arm64 is 11.0
         supported_version = "11.0"
-        otool_cmd = "otool -l target/cmake-build/lib/osx/{}/cruntime/libaws-crt-jni.dylib | grep -E minos | tr -s ' ' | cut -f3 -d' ' | tr -d ' ' | tr -d '[:space:]'".format(arch)
+
+    # otool result has a different format between arm and x64
+    # for arm: we check for "minos"
+    # for x64: The format will be:
+    #
+    # Load command 8
+    # cmd LC_VERSION_MIN_MACOSX
+    #   cmdsize 16
+    #   version 10.15
+    #       sdk 12.1
+    # Load command 9
+    otool_cmd = """
+        otool -l target/cmake-build/lib/osx/{}/cruntime/libaws-crt-jni.dylib | 
+        grep -A5 -E 'LC_VERSION_MIN_MACOSX|LC_BUILD_VERSION' | 
+        grep -E '(version|minos)' | 
+        head -1 | 
+        tr -s ' ' | 
+        cut -f3 -d' ' | 
+        tr -d '[:space:]'
+    """.format(arch)
 
     print("Start to validate the build binary for MacOS with architecture {}, expected min os version: {}".format(arch,supported_version))
     result = subprocess.check_output(otool_cmd, shell=True).decode("utf-8")
@@ -54,3 +60,4 @@ def main():
 
 if __name__ == "__main__":
     main()
+